OS/2 Professional/OS2PRO194.ISO/os2/editor/m_emacs/emacs.doc

Text File | 1994-01-31 | 230KB | 7,240 lines

MicroEMACS

Full Screen Text Editor
Reference Manual

Version 3.11
October 29, 1991

(C)Copyright 1988, 1989, 1990, 1991 by Daniel M. Lawrence
Reference Manual (C)opyright 1988, 1989, 1990, 1991
        by Brian Straight and Daniel M. Lawrence
All Rights Reserved

(C)Copyright 1988, 1989, 1990, 1991 by Daniel M. Lawrence
MicroEMACS 3.11 can be copied and  distributed  freely for any
non-commercial purposes. Commercial users may use MicroEMACS
3.11 inhouse. Shareware distributors may redistribute
MicroEMACS 3.11 for media costs only. MicroEMACS 3.11 can only
be incorporated into commercial software or resold with the
permission of the current author.



Introduction

        MicroEMACS  is  a  tool  for  creating  and   changing  documents,
programs, and other text files. It is both relatively easy for  the novice
to use, but also very powerful in the hands of  an  expert. MicroEMACS can
be extensively customized for the needs of the individual user.

        MicroEMACS allows several files to be edited at the same time. The
screen  can  be  split into different windows and screens, and text may be
moved freely from one window on any screen to the  next.  Depending on the
type  of  file  being edited, MicroEMACS can change how it behaves to make
editing  simple.    Editing  standard  text files, program files and  word
processing documents are all possible at the same time.

        There are  extensive  capabilities  to  make  word  processing and
editing easier. These include commands for string searching and replacing,
paragraph reformatting and deleting, automatic  word  wrapping,  word move
and deletes, easy case controlling, and automatic word counts.

        For complex and repetitive  editing  tasks  editing macroes can be
written. These macroes  allow  the  user  a great degree of flexibility in
determining how MicroEMACS behaves. Also, any and all the commands  can be
used by any keystroke  by  changing,  or  rebinding, what commands various
keys invoke.

        Special  features  are  also available to perform a diverse set of
operations such as  file  encryption,  automatic  backup  file generation,
entabbing and detabbing lines,  executing  operating  system  commands and
filtering  of  text  through  other  programs (like SORT to allow  sorting
text).

History

        EMACS was originally a text  editor written by Richard Stallman at
MIT in the early 1970s  for Digital Equipment computers. Various versions,
rewrites and clones have made an appearance since.

        This version of MicroEMACS is derived from code written by Dave G.
Conroy  in  1985.  Later modifications were performed by Steve Wilhite and
George Jones.  In  December  of  1985  Daniel  Lawrence picked up the then
current  source  (version  2.0)  and  made  extensive   modifications  and
additions to it over the course of the next six years. Updates and support
for the current version are  still available. Commercial support and usage
and resale licences are also available. The current program author  can be
contacted by writing to:

        USMAIL: Daniel Lawrence
                617 New York St
                Lafayette, IN 47901

        UUCP:   pur-ee!mdbs!dan
        ARPA:   mdbs![e-mail]

        Support is provided through:

        The Programmer's Room
        Opus 201/10
        300/1200/2400 and 9600 (Hayes V series only)
        [phone]  no parity  8 databits  no stop bits



Credits

        Many  people  have  been involved in creating this software and we
wish to credit some of them here. Dave Conroy, of  course,  wrote the very
first version of MicroEMACS, and it is a credit to  his  clean coding that
so much work  was able to be done to expand it. John Gamble is responsible
for writing the MAGIC mode search routines, and for  maintaining  all  the
search code. Jeff Lomicka wrote the appendix on DEC VMS and has supplied a
lot of code to support VMS and the  ATARI  1040ST  versions.  Curtis Smith
wrote the original  VMS  code  and  help support the Commodore AMIGA. Also
Lance Jones  has  done  a  lot of work on the AMIGA code. Professor Suresh
Konda at Carnegie Mellon University has  put  a lot of effort into writing
complex macros  and  finding  all  the  bugs  in the macro language before
anyone else does.

        A special thanks to Dana Hoggatt who has provided an  almost daily
sounnding board for ideas, algorithyms and code. He is responcible for the
encryption code directly and has prodded me into adding many features with
simple but poignant questions (Dan? How  do  we move the upper left corner
of the screen? . . . which forced me to write the text windowing system).

        As  to  people  sending  source  code and text  translations  over
computer networks like USENET and ARPA net, there are simply more than can
be  listed  here.  [The comments in the edit history in the history.c file
mention each and the  piece  they contributed]. All these people should be
thanked for the hard work they have put into MicroEMACS.


                                     Daniel M. Lawrence

Basic Concepts                                 MicroEMACS Reference Manual








                                Chapter 1

                              Basic Concepts


        The current version  of  MicroEMACS is 3.11 (Third major re-write,
eleventh  public release), and for the rest of  this  document,  we  shall
simply  refer  to  this  version  as "EMACS". Any modifications for  later
versions will be in the file README on the MicroEMACS distribution disk.


1.1  Keys and the Keyboard


        Many  times  throughout  this  manual  we  will  be talking  about
commands  and  the keys on the keyboard needed to use them.  There  are  a
number of "special" keys which can be used and are listed here:

<NL>              NewLine which is also  called  RETURN,  ENTER,  or <NL>,
                  this key is used to end different commands.

^                 The  control  key  can  be  used  before  any alphabetic
                  character and some symbols.  For  example,  ^C  means to
                  hold down the <CONTROL> key and type the C  key  at  the
                  same time.

^X                The  CONTROL-X  key  is used at the  beginning  of  many
                  different commands.

META or M-        This is a special EMACS key used to begin many commands.
                  his key  is pressed and then released before typing the
                  next character.  On most systems, this is the <ESC> key,
                  but it can be changed. (consult appendix E to learn what
                  key is used for META on your computer).

        Whenever a command is described, the manual will  list  the actual
keystrokes needed to execute it in boldface using  the  above conventions,
and also the name of the command in italics.


1.2  Getting Started


        In order  to  use  EMACS,  you must call it up from your system or
computer's command prompt. On UNIX and MSDOS machines,  just  type "emacs"
from the command prompt and follow it with the <RETURN> or <ENTER> key (we
will refer to this key as  <NL>  for  "new-line" for the remainder of this
manual). On the Macintosh, the Amiga, the ATARI  ST,  and  under  OS/2 and


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MicroEMACS Reference Manual                                 Basic Concepts


other  icon  based  operating  systems,  double click on the uEMACS  icon.
Shortly after this, a screen similar to the one below should appear.


1.3  Parts and Pieces


        The screen is divided into a  number  of areas or windows. On some
systems the top window  contains  a function list of unshifted and shifted
function keys. We will discuss these keys later.  Below  them  is an EMACS
mode line which,  as  we  will  see,  informs  you  of the present mode of
operation of the editor--for example "(WRAP)" if you set EMACS to  wrap at
the end of each line. Under the mode line is the  text  window  where text
appears and is manipulated. Since each window has its own mode line, below
the text window is it's  mode  line.  The  last  line of the screen is the
command line where EMACS takes commands and reports on what it is doing.

==========================================================================
f1 search-> f2 <-search |    MicroEMACS:  Text Editor
f3 hunt->   f4 <-hunt   |
f5 fkeys    f6 help     |  Available function key Pages include:
f7 nxt wind f8 pg[    ] |    WORD  BOX  EMACS  PASCAL  C  cObal  Lisp
f9 save     f10 exit    |  [use the f8 key to load Pages]
==========================================================================
   MicroEMACS 3.11 ()    Function Keys
==========================================================================











==========================================================================
---- MicroEMACS 3.11 () -- Main ------------------------------------------
==========================================================================
                Fig 1:  EMACS screen on an IBM-PC


1.4  Entering Text


        Entering  text in EMACS is simple.  Type  the  following  sentence
fragment:

     Fang Rock lighthouse, center of a series of mysterious and

The text is displayed at the top of the text window. Now type:



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Basic Concepts                                 MicroEMACS Reference Manual


     terrifying events at the turn of the century

        Notice that some of your text has dissapeared off the left side of
the screen. Don't panic--your text  is safe!!! You've just discovered that
EMACS doesn't  "wrap"  text  to  the  next  line like most word processors
unless you hit <NL>. But since EMACS is used for both word processing, and
text  editing, it has a bit of a dual personality. You can change the  way
it  works  by setting various modes. In this case, you need  to  set  WRAP
mode, using the add-mode command, by  typing  ^XM. The command line at the
base of the screen will prompt you for the mode you wish to add. Type wrap
followed by the <NL> key and any  text  you  now  enter  will  be wrapped.
However, the command doesn't wrap text already entered. To get rid  of the
long line, press and hold down the <BACKSPACE> key until the line is gone.
Now  type in the words you deleted, watch how EMACS goes down to the  next
line at the right time. (In some versions of EMACS, WRAP is a default mode
in which case you don't have  to  worry about the instructions relating to
adding this mode.)

        Now  let's type a longer insert. Hit <NL> a couple of times to tab
down from the text you just entered. Now type  the  following  paragraphs.
Press <NL> twice to indicate a paragraph break.

     Fang  Rock  lighthouse,  center of a series  of  mysterious  and
     terrifying  events at the turn of the century,  is  built  on  a
     rocky island a few miles of  the  Channel coast. So small is the
     island that wherever you stand its rocks are wet with sea spray.

     The lighthouse tower  is  in  the  center of the island. A steep
     flight of steps  leads  to  the  heavy door in its base. Winding
     stairs lead up to the crew room.


1.5  Basic cursor movement


        Now let's practice moving around in this text. To move  the cursor
back  to  the  word "Winding," enter M-B previous-word. This command moves
the cursor backwards by one word at a time. Note you have to press the key
combination every time the  cursor  steps  back  by one word. Continuously
pressing META and toggling B produces an error message. To move forward to
the word "stairs" enter  M-F  next-word, which moves the cursor forward by
one word at a time.

        Notice that  EMACS commands are usually mnemonic--F for forward, B
for backward, for example.

        To move the cursor  up  one line, enter ^P previous-line, down one
line ^N next-line. Practice this movement by moving the cursor to the word
"terrifying" in the second line.

        The cursor may  also  be  moved  forward  or  backward  in smaller
increments.  To move forward by one character, enter ^F forward-character,
to move backward, ^B backward-character.  EMACS also allows you to specify
a number which is normally used to tell a command  to  execute many times.


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MicroEMACS Reference Manual                                 Basic Concepts


To repeat most commands, press META  and  then the number before you enter
the command. Thus,  the  command  META  5  ^F (M-5^F) will move the cursor
forward by five characters. Try moving  around  in the text by using these
commands.  For  extra  practice, see how close you can come  to  the  word
"small" in  the  first  paragraph  by  giving  an argument to the commands
listed here.

        Two other simple cursor  commands  that are useful to help us move
around  in  the  text are M-N next-paragraph which moves the cursor to the
second  paragraph,  and  M-P previous-paragraph which moves it back to the
previous paragraph. The cursor may also  be  moved rapidly from one end of
the line to the other. Move the cursor  to  the  word  "few" in the second
line.  Press ^A beginning-of-line. Notice the cursor  moves  to  the  word
"events" at the beginning  of  the line. Pressing ^E end-of-line moves the
cursor to the end of the line.

        Finally, the cursor may be moved from any point in the file to the
end or beginning of the file. Entering M-> end-of-file moves the cursor to
the end of the buffer, M-< beginning-of-file to the first character of the
file.

        On the IBM-PC, the ATARI ST and many other  machines,  the  cursor
keys can also be used to move the cursor.

        Practice moving the cursor in the text until  you  are comfortable
with the commands we've explored in this chapter.


1.6  Saving your text


        When you've finished practicing cursor movement,  save  your file.
Your file currently resides in a BUFFER. The buffer is a temporary storage
area  for your text, and is lost when the computer is turned off. You  can
save  the  buffer  to a file by entering ^X^S save-file. Notice that EMACS
informs you that your file has no name and will not let you save it.

        To save your  buffer  to  a  file  with a different name than it's
current one (which is empty), press ^X^W write-file.   EMACS  will  prompt
you  for the filename you wish to write. Enter the name fang.txt and press
return. On a micro, the drive  light  will  come on, and EMACS will inform
you it is writing the file. When it finishes, it will  inform  you  of the
number of lines it has written to the disk.

        Congratulations!! You've just saved your first EMACS file!











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Basic Concepts                                 MicroEMACS Reference Manual






                            Chapter 1 Summary


        In chapter 1, you learned how to enter text, how to use wrap mode,
how to move the cursor,  and to save a buffer. The following is a table of
the commands covered in this chapter and their corresponding key bindings:

Key Binding             Keystroke       Effect

abort-command           ^G              aborts current command

add-mode                ^XM             allows addition of EMACS
                                        mode such as WRAP

backward-character      ^B              moves cursor left one character

beginning-of-file       M-<             moves cursor to beginning of file

beginning-of-line       ^A              moves cursor to beginning of line

end-of-file             M->             moves cursor to end of file

end-of-line             ^E              moves cursor to end of line

forward-character       ^F              moves cursor right one character

next-line               ^N              moves cursor to next line

next-paragraph          M-N             moves cursor to next paragraph

next-word               M-F             moves cursor forward one word

previous-line           ^P              moves cursor backward by one line

previous-paragraph      M-P             moves cursor to previous paragraph

previous-word           M-B             moves cursor backward by one word

save-file               ^X^S            saves current buffer to a file

write-file              ^X^W            save current buffer under a new name











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MicroEMACS Reference Manual Basic Editing--Simple Insertions and Deletions








                                Chapter 2

              Basic Editing--Simple Insertions and Deletions


2.1  A Word About Windows, Buffers, Screens, and Modes


        In the first chapter, you learned how to create and save a file in
EMACS. Let's do some more editing on this file. Call up emacs by typing in
the following command.

        emacs fang.txt

        On icon oriented systems, double click on the uEMACS icon, usually
a  file  dialog  box of some sort will appear. Choose  FANG.TXT  from  the
appropriate folder.

        Shortly  after you invoke EMACS, the text  should  appear  on  the
screen ready for you to  edit.  The  text  you  are  looking  at currently
resides in a buffer. A buffer is a temporary area of computer memory which
is the  primary  unit  internal  to EMACS -- this is the place where EMACS
goes  to work. The mode line at the bottom of the screen lists the  buffer
name,  FANG.TXT  and  the name of the  file  with  which  this  buffer  is
associated, FANG.TXT

        The  computer talks to you through the use  of  its  screen.  This
screen usually has an area of 24 lines each of  80  characters across. You
can use EMACS to subdivide the screen into several separate work areas, or
windows, each of which  can  be 'looking into' different files or sections
of text. Using windows, you can work on several related texts at one time,
copying and moving blocks of text between windows with ease. To keep track
of  what you are editing, each window is identified by a mode line on  the
last line of the window which lists the  name  of  the  buffer which it is
looking  into, the file from which the text was read, and how the text  is
being edited.

        An  EMACS mode tells EMACS how to deal with user input. As we have
already seen, the  mode  'WRAP'  controls  how EMACS deals with long lines
(lines with over  79  characters)  while  the  user is typing them in. The
'VIEW' mode, allows you to read a file  without  modifying  it.  Modes are
associated with buffers  and  not  with  files;  hence, a mode needs to be
explicitly set or removed every time you edit a file. A new file read into
a buffer with a previously specified mode will be edited under  this mode.
If  you  use  specific modes frequently, EMACS allows you to set the modes
which are used by all new buffers, called global modes.




                                                                         6






Basic Editing--Simple Insertions and Deletions MicroEMACS Reference Manual


2.2  Insertions


        Your previously-saved text should look like this:

     Fang  Rock  lighthouse,  center of a series  of  mysterious  and
     terrifying  events at the turn of the century,  is  built  on  a
     rocky island a few miles of  the  Channel coast. So small is the
     island that wherever you stand its rocks are wet with sea spray.

     The lighthouse tower  is  in  the  center of the island. A steep
     flight of steps  leads  to  the  heavy door in its base. Winding
     stairs lead up to the crew room.

        Let's assume you want to add a sentence in  the  second  paragraph
after  the word "base."  Move the  cursor  until  it  is  on  the  "W"  of
"Winding". Now type the following:

     This  gives  entry  to  the  lower  floor  where the  big  steam
     generator throbs steadily away, providing power for the electric
     lantern.

        If  the  line  fails to wrap and you end up with a '$' sign in the
right margin, just enter M-Q  fill-paragraph  to  reformat  the paragraph.
This new command attempts to fill out a paragraph. Long lines  are divided
up, and words are shuffled around to make the paragraph look nicer.

        Notice that all visible EMACS characters are self-inserting -- all
you had to do was type the characters to insert and the existing text made
space  for it. With a few exceptions  discussed  later,  all  non-printing
characters (such as control or escape sequences) are  commands.  To insert
spaces,  simply use the space bar. Now move to the first line of the  file
and type ^O open-line (Oh, not zero).  You've just learned how to insert a
blank line in your text.


2.3  Deletions


        EMACS offers a number of deletion options. For  example,  move the
cursor until it's under the period  at  the  end of the insertion you just
did.  Press the backspace key. Notice the "n"  on  "lantern"  disappeared.
The backspace implemented  on  EMACS is called a destructive backspace--it
removes  text  immediately  before the current cursor  position  from  the
buffer. Now type  ^H  delete-previous-character.  Notice  that  the cursor
moves  back and obliterates the "r"--either  command  will  backspace  the
cursor.

        Type in the two letters you  erased  to restore your text and move
the cursor to the beginning of the buffer M-> beginning-of-file.  Move the
cursor down one line to the beginning of the first paragraph.

        To delete the forward  character,  type  ^D delete-next-character.
The  "F" of "Fang" disappears. Continue to type ^D until the whole word is


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MicroEMACS Reference Manual Basic Editing--Simple Insertions and Deletions


erased EMACS also permits the deletion of larger elements  of  text.  Move
the cursor to the word  "center"  in  the  first  line  of  text. Pressing
M-<backspace>  delete-previous-word kills the word immediately before  the
cursor. M-^H has the same effect.

        Notice that the commands are  very similar to the control commands
you used to delete individual letters. As a general rule in EMACS, control
sequences affect small areas  of  text,  META  sequences larger areas. The
word forward of the cursor position can therefore be deleted by typing M-D
delete-next-word. Now let's take out the remainder of the  first  line  by
typing ^K kill-to-end-of-line. You now have a blank  line  at  the  top of
your screen. Typing ^K again  or ^X^O delete-blank-lines deletes the blank
line and flushes the second line to the top of the text. Now exit EMACS by
typing ^X^C exit-emacs. Notice  EMACS  reminds you that you have not saved
your buffer. Ignore  the  warning  and  exit.  This way you can exit EMACS
without saving any of the changes you just made.








































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Basic Editing--Simple Insertions and Deletions MicroEMACS Reference Manual






                            Chapter 2 Summary


        In Chapter 2, you learned about the basic 'building blocks'  of an
EMACS text file--buffers, windows, and files.

Key binding             Keystroke       Effect
delete-previous-character
                        ^H              deletes character immediately before
                                        the current cursor position

delete-next-character   ^D              deletes character immediately after
                                        current cursor position

delete-previous-word    M-^H            deletes word immediately before
                                        current cursor position

delete-next-word        M-D             deletes word immediately after
                                        current cursor position

kill-to-end-of-line     ^K              deletes from current cursor
                                        position to end of line

insert-space            ^C              inserts a space to right of cursor

open-line               ^O              inserts blank line

delete-blank-lines      ^X^O            removes blank line

exit-emacs              ^X^C            exits emacs






















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MicroEMACS Reference Manual                                  Using Regions








                                Chapter 3

                              Using Regions


3.1  Defining and Deleting a Region


        At  this point its time to familiarize  ourselves  with  two  more
EMACS terms--the point and the mark. The point is located  directly behind
the  current  cursor  position. The mark (as we shall see shortly) is user
defined. These two elements  together  are  called  the current region and
limit  the  region  of text on which EMACS performs many  of  its  editing
functions.

        Let's begin by entering some new text. Don't forget  to  add  wrap
mode if its not set on this buffer.  Start  EMACS  and  open a file called
PUBLISH.TXT. Type in the following text:

     One  of  the  largest  growth  areas  in  personal computing  is
     electronic   publishing.   There   are  packages  available  for
     practically every machine from elegantly simple programs for the
     humble  Commodore 64 to sophisticated professional packages  for
     PC and Macintosh computers.

     Electronic  publishing is as revolutionary in  its  way  as  the
     Gutenburg press. Whereas the  printing  press  allowed  the mass
     production  and  distribution of the  written  word,  electronic
     publishing puts the means of production in the  hands  of nearly
     every individual.  From  the  class  magazine  to  the corporate
     report, electronic publishing is changing the way we produce and
     disseminate information.

     Personal publishing greatly increases the utility of practically
     every computer. Thousands  of  people  who  joined  the computer
     revolution of this decade only  to hide their machines unused in
     closets  have  discovered  a  new  use  for  them  as  dedicated
     publishing workstations.

        Now let's do some  editing.  The last paragraph seems a little out
of place. To see what the document looks  like  without  it  we can cut it
from the text  by  moving  the  cursor  to the beginning of the paragraph.
Enter M-<space> set-mark. EMACS will respond with "[Mark  set]".  Now move
the cursor to the end of the paragraph.  You have just defined a region of
text.  To  remove this text from the  screen,  type  ^W  kill-region.  The
paragraph disappears from the screen.




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Using Regions                                  MicroEMACS Reference Manual


        On further consideration, however, perhaps  the  paragraph  we cut
wasn't so bad after all. The problem may have been one of placement. If we
could tack it on to the end of  the  first  paragraph  it might work quite
well to support and strengthen the argument. Move the cursor to the end of
the first paragraph  and  enter  ^Y  yank.  Your text should now look like
this:

     One  of  the  largest  growth  areas  in  personal computing  is
     electronic   publishing.   There   are  packages  available  for
     practically every machine from elegantly simple programs for the
     humble  Commodore 64 to sophisticated professional packages  for
     PC  and  Macintosh   computers.    Personal  publishing  greatly
     increases  the utility of practically every computer.  Thousands
     of people who joined the computer revolution of this decade only
     to hide their machines unused in closets have  discovered  a new
     use for them as dedicated publishing workstations.

     Electronic  publishing is as revolutionary in  its  way  as  the
     Gutenburg press. Whereas the  printing  press  allowed  the mass
     production  and  distribution of the  written  word,  electronic
     publishing puts the means of production in the  hands  of nearly
     every individual.  From  the  class  magazine  to  the corporate
     report, electronic publishing is changing the way we produce and
     disseminate information.


3.2  Yanking a Region


        The  text  you  cut initially didn't simply just disappear, it was
cut into a buffer that retains the 'killed' text appropriately  called the
kill  buffer.  ^Y  "yanks" the text back from this buffer into the current
buffer.  If  you  have a long line (indicated, remember, by the "$" sign),
simply hit M-Q to reformat the paragraph.

        There  are  other  uses to which the kill buffer can be put. Using
the method we've already  learned,  define the last paragraph as a region.
Now type M-W copy-region. Nothing seems to have happened; the cursor stays
blinking at the point. But things have changed, even though you may not be
able to see any alteration.

        To see what has happened to the contents of the kill  buffer, move
the  cursor  down a couple of lines and "yank" the contents  of  the  kill
buffer back with ^Y. Notice the last paragraph is now repeated. The region
you defined is "tacked on" to the end of your file  because  M-W  copies a
region to the kill buffer while leaving the original text in  your working
buffer. Some caution is  needed  however, because the contents of the kill
buffer are updated when you delete any regions, lines or words. If you are
moving large quantities of text, complete the operation before you  do any
more  deletions or you could find that the text you want to move has  been
replaced  by  the  most recent deletion. Remember--a buffer is a temporary
area of computer memory that is lost when the machine  is  powered down or
switched off. In order to make your changes permanent, they must  be saved



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MicroEMACS Reference Manual                                  Using Regions


to a file before you leave EMACS. Let's delete the section of text we just
added and save the file to disk.




                            Chapter 3 Summary


        In Chapter 3, you  learned  how  to  achieve longer insertions and
deletions. The EMACS terms point and mark were introduced and  you learned
how to manipulate text with the kill buffer.

Key Binding     Keystroke       Effect

set-mark        M-<space>       Marks the beginning of a region

delete-region   ^W              Deletes region between point and mark and
                                places it in KILL buffer

copy-region     M-W             Copies text between point and mark into
                                KILL buffer

yank-text       ^Y              Inserts a copy of the KILL buffer into
                                current buffer at point































                                                                        12






Search and Replace                             MicroEMACS Reference Manual








                                Chapter 4

                            Search and Replace


4.1  Forward Search


        Load EMACS and bring in the file you just saved. Your  file should
look like the one below.

     One  of  the  largest  growth  areas  in  personal computing  is
     electronic   publishing.   There   are  packages  available  for
     practically every machine from elegantly simple programs for the
     humble  Commodore 64 to sophisticated professional packages  for
     PC  and  Macintosh   computers.    Personal  publishing  greatly
     increases  the utility of practically every computer.  Thousands
     of people who joined the computer revolution of this decade only
     to hide their machines unused in closets have  discovered  a new
     use for them as dedicated publishing workstations.

     Electronic  publishing is as revolutionary in  its  way  as  the
     Gutenburg press. Whereas the  printing  press  allowed  the mass
     production  and  distribution of the  written  word,  electronic
     publishing puts the means of production in the  hands  of nearly
     every individual.  From  the  class  magazine  to  the corporate
     report, electronic publishing is changing the way we produce and
     disseminate information.

        Let's  use EMACS to search for the  word  "revolutionary"  in  the
second paragraph.  Because EMACS searches from the current cursor position
toward  the  end  of buffers, and we intend to search  forward,  move  the
cursor to the beginning of the text. Enter ^S  search-forward.  Note  that
the command line now reads

        "Search [] <META>:"

        EMACS is prompting you to enter the search string -- the  text you
want  to  find.  Enter the word revolutionary and hit the  META  key.  The
cursor moves to the end of the word "revolutionary."

        Notice that you must enter the <META> key to start the  search. If
you simply press  <NL>  the  command  line responds with "<NL>".  Although
this may seem infuriating to users who are used to pressing the return key
to execute any command, EMACS' use  of  <META> to begin searches allows it
to pinpoint text with great accuracy. After every line  wrap  or  carriage
return, EMACS 'sees' a new line character (<NL>).  If  you  need to search



13






MicroEMACS Reference Manual                             Search and Replace


for  a  word at the end of a line, you can specify this word  uniquely  in
EMACS.

        In our sample text for example, the word "and" occurs a  number of
times,  but only once at the end of a line. To search for this  particular
occurrence of the word, move the cursor to the beginning of the buffer and
type ^S. Notice that EMACS stores the last specified search string  as the
default string. If you press <META> now, EMACS will search for the default
string, in this case, "revolutionary."

        To change this  string  so  we  can search for our specified "and"
simply enter the word and followed by <NL>. The command line now shows:

        "search [and<NL>]<META>:"

        Press  <META>  and  the cursor moves to "and" at the  end  of  the
second last line.


4.2  Exact Searches


        If the mode EXACT is active in the current buffer,  EMACS searches
on  a  case  sensitive basis. Thus,  for  example  you  could  search  for
Publishing as distinct from publishing.


4.3  Backward Search


        Backward searching is very  similar  to  forward  searching except
that it is implemented in the reverse direction. To  implement  a  reverse
search, type ^R search-reverse. Because EMACS makes no distinction between
forward  and  backward  stored  search  strings, the last search item  you
entered appears as  the  default  string.  Try searching back for any word
that lies between the cursor and the beginning of the buffer.  Notice that
when  the  item is found, the point moves to the beginning  of  the  found
string  (i.e., the cursor appears under the first  letter  of  the  search
item).

        Practice searching for other words in your text.


4.4  Searching and Replacing


        Searching  and replacing is a powerful and  quick  way  of  making
changes to your text. Our sample text is about electronic  publishing, but
the correct term is 'desktop' publishing. To make the necessary changes we
need to replace all occurrences of the word  "electronic"  with "desktop."
First, move the cursor to the top  of  the  current  buffer  with  the M-<
command. Then type M-R replace-string.  The command line responds:

        "Replace []<META>:"


                                                                        14






Search and Replace                             MicroEMACS Reference Manual


        where the square brackets enclose  the  default  string.  Type the
word electronic and hit <META>. The command line responds:

        "with []<META>"

        type desktop<META>. EMACS replaces all instances  of  the original
word with your revision. Of course, you will have to capitalize  the first
letter of "desktop" where it occurs at the beginning of a sentence.

        You  have  just  completed  an  unconditional  replace.   In  this
operation,  EMACS replaces every instance of the  found  string  with  the
replacement string.


4.5  Query-Replace


        You may also replace text on a case by case basis. The M-^R query-
replace-string command causes EMACS to pause at each instance of the found
string.

        For example, assume we want to replace some instances of  the word
"desktop"  with  the word "personal." Go back  to  the  beginning  of  the
current buffer and enter the  M-^R query-replace command. The procedure is
very   similar  to  that  which  you   followed   in   the   unconditional
search/replace option. When the search  begins  however,  you  will notice
that EMACS pauses at each instance of "publishing" and  asks  whether  you
wish  to  replace  it with the replacement string. You have  a  number  of
options available for response:

        Response        Effect
        Y(es)   Make the current replacement and skip to the next
                occurrence of the search string

        N(o)    Do not make this replacement but continue

        !       Do the rest of the replacements with no more queries

        U(ndo)  Undo just the last replacement and query for it
                again (This can only go back ONE time)

        ^G      Abort the replacement command (This action does not
                undo previously-authorized replacements

        . Same effect as ^G, but cursor returns to the point at
                which the replacement command was given

        ?       This lists help for the query replacement command

        Practice searching and  searching  and  replacing  until  you feel
comfortable with the commands and their effects.





15






MicroEMACS Reference Manual                             Search and Replace


                            Chapter 4 Summary


        In this chapter, you learned how to search  for  specified strings
of text in EMACS. The chapter also dealt with searching for  and replacing
elements within a buffer.

Key Binding             Keystroke                        Effect

search-forward          ^S      Searches from point to end of buffer.
                                Point is moved from current location to
                                the end of the found string

search-backward         ^R      Searches from point to beginning of buffer.
                                Point is moved from current location to
                                beginning of found string

replace                 M-R Replace ALL occurrences of search string with
                                specified (null) string from point to the
                                end of the current buffer

query-replace          M-^R As above, but pause at each found string
                                and query for action

































                                                                        16






Windows                                        MicroEMACS Reference Manual








                                Chapter 5

                                 Windows


5.1  Creating Windows


        We  have  already  met windows in  an  earlier  chapter.  In  this
chapter,  we will explore one of EMACS' more  powerful  features  --  text
manipulation through  multiple windowing. Windows offer you a powerful and
easy  way to edit text. By manipulating a number of windows and buffers on
the screen simultaneously, you can perform complete edits and revisions on
the  computer  screen  while  having  your  draft  text or  original  data
available for reference in another window.

        You will recall that windows are areas of buffer text that you can
see on the  screen.  Because  EMACS  can  support  several  screen windows
simultaneously you can use them to look into different places in  the same
buffer. You  can  also  use  them to look at text in different buffers. In
effect, you can edit several files at the same time.

        Let's invoke EMACS and pull back our file on desktop publishing by
typing

     emacs publish.txt

        When the text appears, type the ^X2  split-current-window command.
The window splits into two windows. The window where the cursor resides is
called the current window -- in  this  case the bottom window. Notice that
each window has  a text area and a mode line. The command line is however,
common to all windows on the screen.

        The two windows on your screen are virtually mirror images of each
other because the new window is opened into the same buffer as the one you
are in when you issue the open-window command  .  All  commands  issued to
EMACS are executed on the current buffer in the current window.

        To move the cursor to the upper window (i.e., to make  that window
the current window, type ^XP previous-window.  Notice the cursor  moves to
the upper or previous  window.  Entering ^XO next-window moves to the next
window. Practice moving between windows. You will notice that you can also
move into the Function Key menu by entering these commands.

        Now  move to the upper window. Let's open a new file. On the EMACS
disk is a tutorial file. Let's call it into the upper window by typing:

     ^X^F


17






MicroEMACS Reference Manual                                        Windows


        and press return.

        Enter the filename emacs.tut.

        In a short time, the tutorial  file  will appear in the window. We
now have two windows  on  the screen, each looking into different buffers.
We  have just used the ^X^F find-file command to find a file and bring  it
into our current window.

        You can scroll any window up and down  with  the  cursor  keys, or
with the  commands  we've  learned  so  far.  However, because the area of
visible  text  in each window is relatively  small,  you  can  scroll  the
current window a line at a time.

        Type ^X^N move-window-down

        The current window scrolls down by one line  --  the  top  line of
text scrolls out of view, and the bottom line moves towards the top of the
screen. You can imagine, if you like, the whole window slowly  moving down
to the end of the buffer in increments of one line. The command ^X^P move-
window-up  scrolls the window in the opposite direction.

        As we have  seen,  EMACS  editing  commands  are  executed  in the
current window, but the program does support a useful feature  that allows
you to  scroll  the  next  window.    M-^Z scroll-next-up scrolls the next
window up, M-^V scroll-next-down  scrolls it downward.  From  the tutorial
window, practice scrolling the window  with the desktop publishing text in
it up and down.

        When you're finished, exit EMACS  without  saving  any  changes in
your files.


        Experiment with splitting the windows on your screen. Open windows
into different buffers and  experiment  with any other files you may have.
Try  editing the text in each window, but don't forget to save any changes
you want to keep -- you still have to save each buffer separately.


5.2  Deleting Windows


        Windows  allow you to perform complex  editing  tasks  with  ease.
However, they become an inconvenience when your screen  is  cluttered with
open windows you have  finished  using. The simplest solution is to delete
unneeded windows. The command ^X0 delete-window will delete the window you
are currently working in and move you to the next window.

        If you have a number of windows open, you can  delete  all but the
current window by entering ^X1 delete-other-windows.






                                                                        18






Windows                                        MicroEMACS Reference Manual


5.3  Resizing Windows


        During complex editing tasks, you will probably find it convenient
to have a  number  of  windows  on the screen simultaneously. However this
situation may present inconveniences because  the more windows you have on
the  screen the smaller they are; in some cases, a window may show only  a
couple  of  lines  of text. To increase the flexibility and utility of the
window environment, EMACS allows you to resize the window you  are working
in (called, as you will recall,  the  current window) to a convenient size
for easier editing, and then shrink it when you no longer need it to be so
large.

        Let's  try  an  example. Load in any EMACS text file and split the
current window  into two. Now type ^X^(Shift-6), grow-window. Your current
window  should be the lower one on the screen. Notice that it increases in
size upwards by  one line. If you are in the upper window, it increases in
size  in  a   downward   direction.   The   command   ^X^Z,  shrink-window
correspondingly decreases window size by one line at a time.

        EMACS  also  allows  you to resize  a  window  more  precisely  by
entering a numeric argument specifying the size of the window in lines. To
resize  the  window  this  way,  press  the  META key and enter a  numeric
argument (remember to keep it smaller than the  number  of  lines  on your
screen display) then press ^XW resize-window.  The current window  will be
enlarged  or  shrunk  to  the  number  of  lines  specified in the numeric
argument. For example entering:

     M-8 ^XW

        will resize the current window to 8 lines.


5.4  Repositioning within a Window


        The cursor may be centered within a window by entering M-! or M-^L
redraw-display.  This  command  is especially useful in  allowing  you  to
quickly  locate the cursor if you are moving  frequently  from  window  to
window. You can  also  use  this  command  to move the line containing the
cursor  to any position within the current window. This is done by using a
numeric  argument before the command. Type M-<n> M-^L  where  <n>  is  the
number of the  line within the window that you wish the current line to be
displayed.

        The  ^L clear-and-redraw command is useful  for  'cleaning  up'  a
'messy'  screen  that  can result of using EMACS on a mainframe system and
being interrupted by a system message.








19






MicroEMACS Reference Manual                                        Windows


        Chapter 5 summary

        In Chapter 5 you learned how to manipulate windows and the editing
flexibility they offer.

Key Binding     Keystroke       Effect

open-window     ^X2             Splits current window into two windows if
                                space available

close-windows   ^X1             Closes all windows except current window

next-window     ^XO[oh]         Moves point into next (i.e. downward) window

previous-window ^XP             Moves point to previous (i.e. upward) window

move-window-down ^X^N           Scrolls current window down one line

move-window-up  ^X^P            Scrolls current window up one line

redraw-display  M ! or          Window is moved so line with point
                M ^L            (with cursor) is at center of window

grow-window     M-X ^           Current window is enlarged by one
                                line and nearest window is shrunk by
                                one line

shrink-window   ^X^Z            Current window is shrunk by one line
                                and nearest window is enlarged by one line

clear-and-redraw ^L             Screen is blanked and redrawn. Keeps
                                screen updates in sync with your commands

scroll-next-up  M-^Z            Scrolls next window up by one line

scroll-next-down M-^V           Scrolls next window down by one line

delete-window   ^X0             Deletes current window

delete-other-windows ^X1        Deletes all but current window

resize-window   ^X^W            Resizes window to a given numeric argument














                                                                        20






Using a Mouse                                  MicroEMACS Reference Manual








                                Chapter 6

                              Using a Mouse


        On computers equipped with a mouse, the mouse can usually  be used
to  make editing easier. If your computer has a mouse, let's try using it.
Start MicroEMACS by typing:

        emacs publish.txt

        This  brings EMACS up and allows it to edit the file from the last
chapter. If the function key window is visible on the screen, press the F5
key to cause it to disappear. Now use the ^X2 split-current-window command
to split the screen into two windows.  Next use the ^X^F find-file command
to read in  the  fang.txt  file.  Now  your screen should have two windows
looking into two different files.

        Grab the mouse  and  move  it  around.  On the screen an arrow, or
block  of  color  appears.  This  is  called  the mouse cursor and can  be
positioned on any character on  the screen. On some computers, positioning
the  mouse cursor in the extreme upper right or left corner may bring down
menus which allow you to access that computers utilities, sometimes called
Desk Accessories.


6.1  Moving around with the mouse


        Using the mouse button (or the  left  button if the mouse has more
than one), position the  mouse  over some character in the current window.
Click the mouse button once. The point will move to where the mouse cursor
is. If you  place  the mouse cursor past the end of a line, the point will
move to the end of that line.

        Move  the  mouse  cursor into the other window and click on one of
the characters there.  MicroEMACS  will automatically make this window the
current window (notice that the mode line changes) and position  the point
to the mouse cursor. This makes it very easy to use the mouse to switch to
a different window quickly.


6.2  Dragging around


        Besides just using the mouse to move around on the screen, you can
use the same  button to move text. Move the mouse cursor to a character in
one of the windows, and click down... but don't let the button up yet! The


21






MicroEMACS Reference Manual                                  Using a Mouse


point will move to where the mouse cursor is. Now move the mouse cursor up
or down on the screen, and release the button. The  point  will again move
to  where the mouse cursor is, but this time it will bring the text  under
it along for the ride. This is called dragging, and is  how  you  can make
the text appear just where you want it to. If you try to drag text  out of
the current window,  EMACS  will  ignore  your attempt and leave the point
where you first clicked down.

        Now, click down on a word in  one  of  the  windows,  and  drag it
directly  to  the  left. Release the button and watch as the entire window
slides, or scrolls to the left.  The missing text has not been deleted, it
is simply not visible, off the  left  hand  side of the screen. Notice the
mode line has changed and now looks like:

==== MicroEMACS 3.11 [<12] () == fang.txt == File: fang.txt =========

        The number insided the brackets [] shows that the  screen  is  now
scrolled 12 characters from the left margin.

        Now  grab  the  same text again, and drag it to the right, pulling
the  rest  of the text back into the current window. The  [<]  field  will
disappear,  meaning that the window is no longer  scrolled  to  the  left.
This  feature  is  very  useful  for  looking  at  wide charts and tables.
Remember,  MicroEMACS  will  only  scroll  the text in the current  window
sideways if you drag it straight to the side, otherwise  it  will drag the
text vertically.

        Now, place the  mouse  cursor  over  a character on the upper mode
line, click down, move the  mouse cursor up or down a few lines and let go
of the button.  The mode line moves to where you dragged it,  changing the
size of the  windows  above and below it. If you try to make a window with
less than one line, EMACS will  not  let  you. Dragging the mode lines can
make  it very fast and easy for you to rearrange the windows as you  would
like.

        If you have a  number  of different windows visible on the screen,
positioning  the  mouse  over the mode line of one window and clicking the
right mouse button will cause that window to be deleted.


6.3  Cut and Paste


        If your mouse has two buttons,  then  you can use the right button
to do some other things as well.  Earlier,  we  learned  how  to  define a
region  by  using  the M-<space> set-mark command. Now, position the mouse
over  at the beginning of a region you would like to copy. Next click  and
hold down the right mouse button. Notice that the point jumps to the mouse
cursor and EMACS reports "[Mark Set]". Holding the button  down  move  the
mouse  to  the  end  of  the text you wish to copy and release  the  mouse
button.  Emacs reports "[Region Copied]" to let you know it has copied the
region  into the KILL buffer. This has done the same job as the M-W  copy-
region command.



                                                                        22






Using a Mouse                                  MicroEMACS Reference Manual


        If you now click the right mouse button, without moving the mouse,
the region you defined dissapear, being cut from the current  buffer. This
works just like the ^W kill-region command.

        If  you move the mouse away from where you cut the text, and click
the right mouse button down and up without moving the  mouse,  the text in
the  KILL  buffer  gets inserted, or pasted into the current buffer at the
point.


6.4  Screens


        MicroEMACS can use more than one screen at once. Each screen  is a
collection of windows along  with  a mode line. These screens usually fill
the terminal or computer screen on text based  systems,  but  can  also be
held  in different windows on graphically  based  systems  like  MicroSoft
Windows,  OS/2,  the  Macintosh Finder and X-Windows. Don't be confused by
the two different uses of the term "window". Inside EMACS style editors, a
window lets you view part of a buffer. Under graphical  operating systems,
a window holds a "virtual terminal", allowing you to manipulate  more than
one  job, editing session or program at  once.  Within  MicroEMACS,  these
operating  system  windows  are  called  screens.  All  these screens  are
displayed on your current desktop.


6.5  Resizing a Screen


        You can change the size of  a  screen.  Move the mouse to the last
position of the command line. Press the left mouse  button  down.  Holding
it, move the mouse to the place  you  want  the  new  lower  right corner.
Release  the  mouse.  The desktop redraws, with your newly resized screen.
MicroEMACS will ignore size changes that can not be done,  like attempting
to  pull the lower left corner above the upper right corner of the current
screen.


6.6  Moving a Screen


        To change where on the desktop a screen is placed, move  the mouse
to the upper right corner of the screen, press the left mouse button down,
move the mouse and release it where you want the screen  displayed. Again,
MicroEMACS will ignore placements that can not be done.


6.7  Creating a Screen


        Creating a new screen is just like moving a screen, but  using the
right button. Move to the upper right of  an  existing  screen,  press the
right mouse button down, and move the mouse, releasing  the  button  where
the new screen  should  appear.  A  new  screen will have a single window,


23






MicroEMACS Reference Manual                                  Using a Mouse


containing the contents of the current window in the  copied  screen,  and
will  have  that window's colors. The new  screen  will  have  the  copied
screen's size.


6.8  Switching to a Screen


        This is simple. Any mouse command can be  done  in  any  screen by
placing the mouse on a visible part of the screen  and  clicking. The last
screen  the  mouse is used on comes to front and is  the  current  screen.
Also, the A-C cycle-screens command brings the rearmost screen to front.


6.9  Deleting a Screen


        Place the mouse  on  the  command  line  of the screen you want to
delete. Click the  right  mouse  button,  the screen will disapear. If you
delete the only remaining screen on the desktop, MicroEMACS will exit.




































                                                                        24






Using a Mouse                                  MicroEMACS Reference Manual






                            Chapter 6 Summary


        In  Chapter 6, you learned how to use the mouse to move the point,
switch windows, drag text, and resize windows. You also learned how to use
the right mouse button in order to copy and delete  regions  and yank them
back  at other places. And lastly, you learned  how  to  control  multiple
screens with the mouse.












































25






MicroEMACS Reference Manual                                  Using a Mouse


Action          Mouse Directions

Move Cursor     position mouse cursor over desired location
                click down and up with left button

Drag Text       position mouse cursor over desired text
                click left button down
                move to new screen location for text
                release mouse button

Resize Windows  position mouse cursor over mode line to move
                click left button down
                move to new location for mode line
                release mouse button

Delete Window   position mouse cursor over mode line of window to delete
                click right mouse button

Activate Screen Move mouse over existing screen
                click left button down and up

Resize Screen   position mouse cursor over last character on message line
                click left button down
                move to new lower right corner of screen
                release mouse button

Copy Region     position mouse at beginning of region
                click right button down
                move to end of region
                release mouse button

Cut Region      position mouse at beginning of region
                click right button down
                move to end of region
                release mouse button
                click right button down and up

Paste Region    position mouse at place to paste
                click right button down and up

Create Screen   position mouse at upper left corner of existing screen
                click right button down
                move to position of new screen
                release mouse button

Resize Screen   position mouse at lower right corner of screen
                click left button down
                move to new lower left corner
                release mouse button

Move Screen     position mouse at upper right corner of screen
                click left button down
                move to new screen position
                release mouse button


                                                                        26






Buffers                                        MicroEMACS Reference Manual


Delete Screen   position to command line of existing screen
                click right button down
                release mouse button






                                Chapter 7

                                 Buffers


        We have already learned  a  number of things about buffers. As you
will  recall,  they  are the major internal entities in EMACS -- the place
where  editing  commands  are executed. They are  characterized  by  their
names, their modes, and by the  file  with which they are associated. Each
buffer also "remembers" its mark and point. This convenient feature allows
you  to  go to other buffers and return to the original  location  in  the
"current" buffer.

        Advanced users of EMACS frequently have a number of buffers in the
computer's memory simultaneously. In  the  last  chapter, for example, you
opened at least two buffers -- one into the text you were editing, and the
other into the EMACS on-line tutorial. If you deal with complex text files
-- say, sectioned  chapters of a book, you may have five or six buffers in
the  computer's  memory.  You  could  select different buffers  by  simply
calling  up the file with ^X^F find-file, and let EMACS open or reopen the
buffer. However, EMACS offers fast and sophisticated  buffering techniques
that you will find easy to master and much more convenient to use.

        Let's begin by opening  three  buffers. You can open any three you
choose,  for  example  call  the  following files into  memory:  fang.txt,
publish.txt, and emacs.tut in the  order listed here. When you've finished
this process, you'll be looking at a screen showing  the  EMACS  tutorial.
Let's assume that you want to move to the fang.txt buffer. Enter:

        ^XX next-buffer

        This  command  moves  you to the next buffer. Because EMACS cycles
through the buffer list, which is alphabetized, you  will  now  be  in the
fang.txt buffer. Using ^XX again places you in the publish.txt  buffer. If
you are on a machine that  supports  function keys, using ^XX again places
you in the Function Keys buffer. Using ^XX one last  time  cycles you back
to the beginning of the list.

        If you have a large number  of  buffers to deal with, this cycling
process may be slow and inconvenient. The command ^XB select-buffer allows
you to specify  the buffer you wish to be switched to. When the command is
entered, EMACS prompts, "Use buffer:".  Simply enter the buffer  name (NOT
the  file  name),  and that buffer will then become the current buffer. If
you type in part of  the  file  name  and  press the space bar, EMACS will
attempt  to  complete  the name from the list of current  buffers.  If  it


27






MicroEMACS Reference Manual                                        Buffers


succeeds, it  will  print  the  rest  of  the name and you can hit <NL> to
switch to that buffer. If EMACS beeps the bell, there  is  no such buffer,
and you may continue editing the name on the command line.

        Multiple buffer manipulation and editing  is  a  complex activity,
and you will probably find it very inconvenient to re-save each  buffer as
you modify it.  The  command  ^X^B  list-buffers creates a new window that
gives details about all the buffers currently known to EMACS. Buffers that
have  been  modified  are identified by the "buffer changed" indicator (an
asterisk in the second  column).  You can thus quickly and easily identify
buffers that need to be saved to files before you  exit  EMACS. The buffer
window also provides other  information  --  buffer specific modes, buffer
size, and buffer name are also  listed.  To close this window, simply type
the close-windows command, ^X1.

        To delete any buffer,  type  ^XK  delete-buffer. EMACS prompts you
"Kill  buffer:".  Enter  the buffer name you want to delete.  As  this  is
destructive command, EMACS will  ask  for  confirmation  if the buffer was
changed  and  not saved.  Answer Y(es) or N(o). As usual  ^G  cancels  the
command.




































                                                                        28






Buffers                                        MicroEMACS Reference Manual






                            Chapter 7 Summary


        In Chapter 7 you learned how to manipulate buffers.

Key Binding             Keystroke                      Effect
next-buffer             ^X^X            Switch to the next buffer in the
                                        buffer list

select-buffer           ^XB             Switch to a particular buffer

list-buffers            ^X^B            List all buffers

delete-buffer           ^XK             Delete a particular buffer if it
                                        is off-screen





































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MicroEMACS Reference Manual                                          Modes








                                Chapter 8

                                  Modes


        EMACS allows you to change the way it works in order to customized
it to the style of  editing  you  are  using.  It does this by providing a
number of different modes. These modes can effect either a  single buffer,
or any new  buffer  that is created.  To add a mode to the current buffer,
type ^XM add-mode. EMACS will then prompt you for the name  of  a  mode to
add. When you  type  in a legal mode name, and type a <NL>, EMACS will add
the  mode  name  to the list of current mode names in the mode line of the
current buffer.

        To remove an existing mode, typing the ^X^M delete-mode will cause
EMACS to prompt you for  the  name  of  a  mode to delete from the current
buffer.  This will remove that mode from the mode list on the current mode
line.

        Global modes are the modes which are inherited by any  new buffers
which are created. For example, if you wish to always do  string searching
with character case being significant, you would want global mode EXACT to
be set so that any new files read in inherent the EXACT mode. Global modes
are  set with the M-M add-global-mode command, and  unset  with  the  M-^M
delete-global-mode command. Also, the current global  modes  are displayed
in the first line of a ^X^B list-buffers command.

        On  machines  which  are capable of displaying  colors,  the  mode
commands  can also set the background  and  foreground  character  colors.
Using  add-mode  or  delete-mode  with  a  lowercase  color will  set  the
background color in the current window.    An uppercase color will set the
foreground color in  the  current  window.   Colors that EMACS knows about
are: white, cyan,  magenta,  yellow,  blue,  red, green, and black. If the
computer you are running on does not have eight colors, EMACS will attempt
to  make some intelligent guess at what color to use when you ask for  one
which is not there.


8.1  ASAVE mode


        Automatic Save mode tells EMACS  to  automatically  write  out the
current buffer to its associated file on a regular  basis.  Normally  this
will be every 256 characters typed into the file. The environment variable
$ACOUNT counts down to the next auto-save, and $ASAVE is the value used to
reset $ACOUNT after a save occurs.




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Modes                                          MicroEMACS Reference Manual


8.2  CMODE mode


        CMODE is useful to C programmers. When CMODE is active, EMACS will
try to assist the user in a number of ways. This mode is set automatically
with files that have a .c or .h extension.

        The <NL> key will normally attempt to return the user to  the next
line at the same level of indentation as the last  non  blank line, unless
the current line ends with a open brace  ({)  in  which  case the new line
will be further indented by one tab position.

        A close brace (}) will search for the corresponding open brace and
line up with it.

        A pound sign (#) with only leading white space will delete all the
white  space  preceding  itself.  This  will  always   bring  preprocessor
directives flush to the left margin.

        Whenever any close fence  is  typed, IE )]>}, if the matching open
fence is on screen in the current window, the cursor will briefly flash to
it, and then back. This makes balancing expressions,  and  matching blocks
much easier.


8.3  CRYPT mode


        When a buffer is in CRYPT mode, it  is  encrypted  whenever  it is
written to a  file,  and  decrypted  when  it  is  read from the file. The
encryption key can be specified on the command line with the -k switch, or
with the M-E set-encryption-key command. If you attempt to read or write a
buffer in crypt mode and now key has not been set, EMACS will execute set-
encryption-key automatically,  prompting you for the needed key.  Whenever
EMACS  prompts  you  for a key, it will not echo the key to your screen as
you type it (IE make SURE you get it right when you set it originally).

        The encryption algorithm used changes all  characters  into normal
printing characters, thus the resulting file is suitable  for  sending via
electronic  mail. All version of MicroEMACS should  be  able  decrypt  the
resulting file regardless of what  machine  encrypted  it.  Also available
with  EMACS  is  the stand alone program, MicroCRYPT, which can en/decrypt
the files produced by CRYPT mode in EMACS.


8.4  EXACT mode


        All string searches and replacements  will  take  upper/lower case
into  account. Normally the case of a string during a search or replace is
not taken into account.





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8.5  MAGIC mode


        In the MAGIC mode  certain  characters  gain special meanings when
used  in  a  search  pattern.   Collectively  they  are  know  as  regular
expressions, and a limited  number  of  them  are supported in MicroEmacs.
They grant greater flexibility when using the search command. They have no
affect on the incremental search command.

        The symbols that have special meaning  in  MAGIC mode are ^, $, .,
&, ?, *, +, [ (and ], used with it), and \.

        The characters ^ and $ fix the search pattern to the beginning and
end of line, respectively. The ^ character must appear at the beginning of
the  search string, and the $ must appear at the end, otherwise they loose
their meaning and are treated just like any other character.  For example,
in  MAGIC mode, searching for the pattern "t$" would put the cursor at the
end  of  any  line that ended with the  letter  't'.  Note  that  this  is
different than searching for  "t<NL>",  that is, 't' followed by a newline
character. The character $ (and ^, for that matter)  matches  a  position,
not  a character, so the cursor remains at the end of the  line.    But  a
newline  is a character that must be matched  like  any  other  character,
which means that  the cursor is placed just after it - on the beginning of
the next line.

        The character . has a very simple meaning -- it matches any single
character,  except the newline. Thus a search  for  "bad.er"  could  match
"badger", "badder" (slang), or up to the 'r' of "bad error".

        The character [ indicates the beginning of a  character  class. It
is similar  to  the  'any'  character  .,  but  you  get  to  choose which
characters  you  want to match. The character  class  is  ended  with  the
character  ]. So, while a search for "ba.e"  will  match  "bane",  "bade",
"bale", "bate", et cetera, you can limit it to matching "babe"  and "bake"
by  searching for "ba[bk]e". Only one of the characters inside the [ and ]
will  match a character. If in fact you want to match any character except
those  in the character class, you can put a ^ as the first character.  It
must be the  first  character  of  the  class,  or  else it has no special
meaning. So,  a  search  for  [^aeiou]  will  match any character except a
vowel, but a search for [aeiou^] will match any vowel or a ^.

        If  you have many characters in order, that you want to put in the
character class, you may use a  dash  (-)  as a range character. So, [a-z]
will match any  letter (or any lower case letter if EXACT mode is on), and
[0-9a-f] will match any digit or any letter 'a' through 'f',  which happen
to be the characters for  hexadecimal  numbers.  If  the  dash  is  at the
beginning or end of a character class, it is taken to be just a dash.

        The  ?  character  indicates  that  the  preceding   character  is
optional. The character may or may  not  appear in the matched string. For
example, a search  for  "bea?st"  would  match both "beast" and "best". If
there is no  preceding charcter for ? to modify, it is treated as a normal
question mark character.



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        The * character is known as  closure,  and means that zero or more
of the preceding character will match. If there is no preceding character,
        * has no special meaning and is treated as a normal  asterisk. The
closure  symbol will also have no special meaning if it is preceded by the
beginning  of  line  symbol ^, since  it  represents  a  position,  not  a
character.

        The notion of  zero  or  more  characters  is  important.  If, for
example, your cursor was on the line

     This line is missing two vowels.

        and a search was made for "a*", the cursor would not move, because
it  is  guaranteed  to match no letter 'a' , which  satisfies  the  search
conditions. If you wanted to search for one or more of the letter 'a', you
could  search for "aa*", which would match the letter a, then zero or more
of them. A better way, however, is to use the + character.

        The + character behaves  in  every  respect  like the * character,
with the exception that its minimum match range is one, not zero. Thus the
pattern "a+" is identical to "aa*".

        Under older  versions of MicroEMACS, the closure symbols would not
operate on newlines. The current versions no longer have this restriction.

        The \ is the escape character. With the exception of groups, which
are explained below,  the  \ is used at those times when you want to be in
MAGIC mode, but  also  want  a  regular  expression character to be just a
character. It turns off the special meaning of the character. So  a search
for "it\." will search for a line with "it.", and not "it" followed by any
other  character. Or, a search for "TEST\*+" would  match  the  word  TEST
followed by one or more asterisks. The escape character will also  let you
put ^, -, or ] inside a character class with no special side effects.

        The character pair \( represent the  start  of a group in a search
string. A group is ended by the character pair \). All  characters matched
within  the \( and \) are part of a numbered group, and may be  referenced
with the &GROUP  function, or with a \ followed by the group number in the
replacement string of replace-string or the query-replace-string commands.
For  example,  a  search   for   "INDEX\([0-9]+\)",   to  be  replaced  by
"getind(\1)" would change

     indptr := INDEX42

         to

     indptr := getind(42)

        .

        There may be up to nine groups. Groups may be nested.

        The  character  &  (ampersand)  is  a  replacement  character, and
represents all the characters  which  were  matched  by the search string.


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MicroEMACS Reference Manual                                          Modes


When  used  in  the M-R replace-string or  the  M-^R  query-replace-string
commands, the & will be substituted for the search string.


8.6  OVER mode


        OVER  mode  stands  for  overwrite  mode. When in this mode,  when
characters  are typed, instead of simply inserting  them  into  the  file,
EMACS  will attempt to overwrite an existing  character  past  the  point.
This is very useful for adjusting tables and diagrams.


8.7  WRAP mode


        Wrap mode is used  when  typing  in  continuous text. Whenever the
cursor  is past the currently set fill column (72 by default) and the user
types a space or a <NL>, the last word of the line is brought down  to the
beginning of the next line. Using this, one just types a continuous stream
of words and EMACS automatically inserts <NL>s at appropriate places.

                           NOTE to programmers:

     The EMACS variable  $wraphook  contains the name of the function
     which executes when EMACS detects it is time to  wrap.  This  is
     set to the function wrap-word by default, but can be  changed to
     activate different functions and macros at wrap time.


8.8  VIEW mode


        VIEW  mode  disables  all commands which can  change  the  current
buffer. EMACS will display an error  message  and ring the bell every time
you attempt to change a buffer in VIEW mode.




















                                                                        34






Modes                                          MicroEMACS Reference Manual






                            Chapter 8 Summary


        In Chapter 8 you learned about modes and their effects.

Key Binding             Keystroke                      Effect
add-mode                ^XM             Add a mode to the current buffer

delete-mode             ^X^M            Delete a mode from the current buffer

add-global-mode         M-M             Add a global mode to the
                                        current buffer

delete-global-mode      M-^M            Delete a global mode from the
                                        current buffer





































35






MicroEMACS Reference Manual                                          Files








                                Chapter 9

                                  Files


        A file is simply a collection of related  data.  In  EMACS  we are
dealing  with  text  files -- named collections of text residing on a disk
(or some other storage medium). You will recall that  the  major  entities
EMACS deals with are buffers. Disk-based versions of files are only active
in  EMACS when you are reading into or writing out of buffers. As we  have
already seen, buffers and  physical  files  are  linked by associated file
names.  For example, the buffer "ch7.txt" which  is  associated  with  the
physical disk file  "ch7.txt."  You  will  notice that the file is usually
specified by the drive name  or (in the case of a hard drive) a path. Thus
you can specify full file names in EMACS,

        e.g. disk:\directories\filename.extension

        If you do not specify a disk and directories, the default disk and
the current directory is used.

        IMPORTANT -- If you do not explicitly save your buffer to  a file,
all your edits  will  be  lost  when  you leave EMACS (although EMACS will
prompt you when  you  are  about  to  lose edits by exiting). In addition,
EMACS  does not protect your disk-based files  from  overwriting  when  it
saves files.  Thus when you instruct EMACS to save a file to disk, it will
create  a  file  if the specified file doesn't exist, or it will overwrite
the previously  saved  version  of  the  file  thus replacing it. Your old
version is gone forever.

        If  you are at all unsure about your edits, or if (for any reason)
you  wish to keep previous versions of a file, you can change the name  of
the associated file with the  command ^XN change-file-name. When this file
is  saved  to disk, EMACS will create a new physical file  under  the  new
name. The earlier disk file will be preserved.

        For  example,  let's  load the file fang.txt into EMACS. Now, type
^XN. The EMACS command line prompts "Name:". Enter a new name for the file
-- say new.txt  and  press  <NL>.  The  file  will  be saved under the new
filename, and your disk directory will show both fang.txt and new.txt.

        An alternative method is to write the file directly to  disk under
a new filename.  Let's  pull  our  "publish.txt" file into EMACS. To write
this file under another filename,  type ^X^W write-file. EMACS will prompt
you "write file:".  Enter an alternate filename -- desktop.txt.  Your file
will be saved as the physical file "desktop.txt".




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Files                                          MicroEMACS Reference Manual


        Note that in the  examples  above,  although  you have changed the
names of the  related  files,  the  buffer names remain the same. However,
when you pull the physical file  back  into  EMACS, you will find that the
buffer name now relates to the filename.

        For example -- You  are  working with a buffer "fang.txt" with the
related file "fang.txt".  You  change  the  name of the file to "new.txt".
EMACS now shows  you  working  with  the buffer "fang.txt" and the related
file "new.txt". Now pull the file "new.txt" into EMACS.  Notice  that  the
buffer name has now changed to "new.txt".

        If for any reason  a  conflict of buffer names occurs,(if you have
files of the same name on different drives for example) EMACS  will prompt
you "use buffer:". Enter an alternative buffer name if you need to.

        For a list of file  related commands (including some we`ve already
seen), see the summary page.







































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MicroEMACS Reference Manual                                          Files






                            Chapter 9 Summary


        In Chapter 9  you  learned  some  of the more advanced concepts of
file naming and  manipulation.  The relationship between files and buffers
was discussed in some detail.

Key Binding     Keystroke       Effect

save-file       ^X^S            Saves contents of current buffer with
                                associated filename on default disk/
                                directory (if not specified)

write-file      ^X^W            Current buffer contents will be
                                saved under specified name

change-file-name
                ^XN             The associated filename is changed
                                (or associated if not previously
                                specified) as specified

find-file       ^X^F            Reads specified file into buffer and
                                switches you to that buffer, or switches
                                to buffer in which the file has previously
                                been read

read-file       ^X^R            Reads file into buffer thus overwriting
                                buffer contents. If file has already
                                been read into another buffer, you will
                                be switched to it

view-file       ^X^V            The same as read-file except the buffer
                                is automatically put into VIEW mode thus
                                preventing any changes from being made


















                                                                        38






Screen Formatting                              MicroEMACS Reference Manual








                                Chapter 10

                            Screen Formatting


10.1  Wrapping Text


        As we learned in the introduction, EMACS is not a  word processor,
but  an  editor.  Some simple formatting options  are  available  however,
although in most cases they will not affect the appearance of the finished
text when it  is  run  through  the formatter. We have already encountered
WRAP  mode  which  wraps lines longer than a certain length (default is 75
characters).  You will recall that WRAP is enabled  by  entering  ^XM  and
responding to the command line prompt with wrap.

        You  can  also  set your own wrap margin with the command ^XF set-
fill-column.  Notice  EMACS  responds "[Fill column is 1]." Now try typing
some text. You'll notice  some  very strange things happening -- your text
wraps at  every  word!!  This  effect  occurs  because the set wrap margin
command must  be  preceded  by  a numeric argument or EMACS sets it to the
first  column.  Thus  any text you type that extends past the first column
will wrap at the most convenient line break.

        To reset the wrap column to 72 characters, press  the  <META>  key
and enter 72.  EMACS  will  respond  "Arg:  72". Now press ^XF. EMACS will
respond "[Fill column is 72]". Your text will  again  wrap  at  the margin
you've been using up to this point.


10.2  Reformatting Paragraphs


        After an intensive editing  session,  you  may  find that you have
paragraphs containing lines of differing lengths. Although  this disparity
will not affect the formatted text, aesthetic and  technical  concerns may
make it desirable to have consistent paragraph blocks on  the  screen.  If
you are in WRAP mode, you  can  reformat  a paragraph with the command M-Q
fill-paragraph. This command 'fills' the current paragraph reformatting it
so all the lines are filled and wrap logically.


10.3  Changing Case


        There may be occasions when you find it necessary  to  change  the
case of the text you've entered.  EMACS  allows  you to change the case of
even  large amounts of text with ease. Let's try and convert a few of  the


39






MicroEMACS Reference Manual                              Screen Formatting


office  traditionalists  to  the  joy  of  word  processing. Type  in  the
following text:

     Throw  away  your  typewriter and learn to use a word processor.
     Word processing is relatively  easy  to  learn and will increase
     your productivity enormously. Enter the  Computer  Age  and find
     out just how much fun it can be!!

        Let's give it a little more impact by capitalizing the  first four
words.  The  first  step is to define the region of text just as you would
if  you were doing an extensive deletion. Set the mark at the beginning of
the paragraph with  M-<space>  set-mark  and  move the cursor to the space
beyond "typewriter." Now  enter  ^X^U case-region-upper.  Your text should
now look like this:

     THROW  AWAY  YOUR  TYPEWRITER and learn to use a word processor.
     Word processing is relatively  easy  to  learn and will increase
     your productivity enormously. Enter the  Computer  Age  and find
     out just how much fun it can be!!

        If you want to change the text back to lower case, type ^X^L case-
region-lower. You  can also capitalize individual words. To capitalize the
word "fun", position the cursor in  front  of  the word and type M-U case-
word-upper.  The  word  is now capitalized. To change it ck to lower case,
move  the cursor back to the beginning of the word and type M-L case-word-
lower.

        You may also  capitalize  individual letters in EMACS. The command
M-C case-word-capitalize capitalizes the  first  letter  after  the point.
This command would normally be issued with the cursor positioned  in front
of the first letter of the word you wish to capitalize. If you issue it in
the middle of a word, you can end up with some strAnge looking text.


10.4  Tabs


        Unless your  formatter is instructed to take screen text literally
(as MicroSCRIBE does in the 'verbatim' environment for  example),  tabs in
EMACS generally affect screen formatting only.

        When  EMACS is first started, it sets the  default  tab  to  every
eighth  column. As long as you stay with default, every time you press the
tab  key  a tab character, ^I is  inserted.  This  character,  like  other
control characters, is invisible -- but it makes a subtle  and significant
difference to your file and editing.

        For example, in default mode, press the tab key and then  type the
word  Test.  "Test"  appears at the eighth column. Move your cursor to the
beginning of the word and delete the backward character. The  word doesn't
move  back just one character, but flushes to the left margin.  The reason
for this behavior  is  easily  explained.  In tab default, EMACS inserts a
'real'  tab  character  when  you  press  the  tab  key. This character is
inserted at the default  position,  but NO SPACES are inserted between the


                                                                        40






Screen Formatting                              MicroEMACS Reference Manual


tab  character and the margin (or previous tab  character).  As  you  will
recall, EMACS only recognizes characters (such as spaces  or  letters) and
thus when the tab character is removed, the text beyond the tab is flushed
back to the margin or previous tab mark.

        This situation changes if you alter the default configuration. The
default  value  may  be changed by  entering  a  numeric  argument  before
pressing  the  tab  key.  As  we  saw  earlier, pressing the META key  and
entering a number allows you to specify how EMACS performs a given action.
In this case, let's specify an argument of 10 and hit the tab key.

        Now  hit  the  tab key again and type Test. Notice  the  word  now
appears at  the  tenth  column.  Now move to the beginning of the word and
delete the backward character. "Test" moves back by one character.

        EMACS behaves differently in these  circumstances  because  the ^I
handle-tab  function  deals  with tabbing in two distinct ways. In default
conditions, or if the numeric argument of zero is used, handle-tab inserts
a  true  tab  character.  If,  however,  a  non-zero numeric  argument  is
specified,  handle-tab  inserts  the correct number of  spaces  needed  to
position the cursor at the next specified tab position. It does NOT insert
the  single  tab  character  and  hence any editing functions should  take
account of the number of spaces between tabbed columns.

        The distance which a true tab character moves the  cursor  can  be
modified  by  changing  the value of the  $hardtab  environment  variable.
Initially set to 8, this will  determine  how  far each tab stop is placed
from the previous one. (Use the ^XA set  command  to  set  the value of an
environment variable).

        Many  times you would like to take text  which  has  been  created
using the tab character and change it to use just spaces. The command ^X^D
detab-region changes any tabs    in the currently selected region into the
right number of spaces so the  text  does  not change. This is very useful
for  times when the file must be printed or transferred to a machine which
does not understand tabs.

        Also,  the  inverse command, ^X^E  entab-region  changes  multiple
spaces to tabs  where  possible.  This is a good way to shrink the size of
large documents, especially with data tables. Both of  these  commands can
take a numeric argument which will  be  interpreted as the number of lines
to en/detab.

        Another  function,  related  to those above is provided for by the
^X^T trim-region when invoked will delete any trailing white space  in the
selected region. A preceding numeric argument will do this for that number
of lines.









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                            Chapter 10 Summary


        In Chapter 10 introduced some of the formatting features of EMACS.
Text-wrap, paragraph reformatting, and tabs were discussed in some detail.
The commands in the following table were covered in the chapter.


Key Binding             Keystroke                   Effect
add-mode/WRAP           ^XM[WRAP]       Add wrap mode to current buffer

delete-mode/WRAP        ^X^M[WRAP]      Remove wrap mode from current buffer

set-fill-column         ^XF             Set fill column to given numeric
                                        argument

fill-paragraph          M-Q             Logically reformats the current
                                        paragraph

case-word-upper         M-U             Text from point to end of the
                                        current word is changed to uppercase

case-word-lower         M-L             Text from point to end of the
                                        current word is changed to lowercase

case-word-capitalize    M-C             First word (or letter) after the
                                        point is capitalized

case-region-upper       ^X^U            The current region is uppercased

case-region-lower       ^X^L            The current region is lowercased

handle-tab              ^I              Tab interval is set to the given
                                        numeric argument

entab-region            ^X^E            Changes multiple spaces to tabs
                                        characters where possible

detab-region            ^X^D            Changes tab characters to the
                                        appropriate number of spaces

trim-region             ^X^T            Trims white space from the end
                                        of the lines in the current region









                                                                        42






Access to the Outside World                    MicroEMACS Reference Manual








                                Chapter 11

                       Access to the Outside World


        EMACS  has  the  ability  to  interface to other programs and  the
environment  of the computer outside of itself. It  does  this  through  a
series  of  commands  that  allow  it  to  talk  to the computer's command
processor or shell. Just what  this is varies between different computers.
Under MSDOS or  PCDOS  this  is  the command.com command processor.  Under
UNIX it is the csh shell. On the Atari ST is can be the Mark  Williams MSH
or the  Beckmeyer  shell.  In  each case, it is the part of the computer's
operating system that is responsible  for  determining  what  programs are
executed, and when.

        The ^X! shell-command command prompts  the user for a command line
to send out to the shell to execute.  This  can  be  very useful for doing
file  listings  and  changing the current directory or folder. EMACS gives
control to the shell, which executed the command, and then types [END] and
waits for the user to type a character  before  redrawing  the  screen and
resuming editing. If the  shell-command  command  is  used from within the
macro language, there is no pause.

        ^X@ pipe-command  command allows EMACS to execute a shell command,
and if the particular computer allows  it,  send the results into a buffer
which  is automatically displayed on the  screen.  The  resulting  buffer,
called  "command"  can  be manipulated just like any other editing buffer.
Text can be copied out of it  or  rearranged  as  needed.  This  buffer is
originally created in VIEW  mode,  so remember to ^X^Mview<NL> in order to
change it.

        Many computers provide tools which  will allow you to filter text,
making some modifications to it along the way. A very  common  tool is the
SORT  program  which  accepts a file, sorts it, and prints the result out.
The EMACS command, ^X# filter-buffer sends the current buffer through such
a  filter. Therefore, if you wished to sort the current buffer on a system
which  supplied  a  sort filter, you would type ^X#sort<NL>.  You can also
create your own filters by writing programs and utilities which  read text
from the keyboard and display the results. EMACS  will  use  any  of these
which would normally be available from the current shell.

        If you would like to execute another program directly, without the
overhead  of an intervening shell, you can  use  the  ^X$  execute-program
command. It will prompt you for an external program and its  arguments and
attempt to execute it.  Like when EMACS  looks  for  command  files, EMACS
will look first in the HOME directory, then  down  the  execute  PATH, and
finally in the current  directory  for the named program. On some systems,
it  will  automatically tack the proper extension  on  the  file  name  to


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indicate  it  is  a program. On  some  systems  that  don't  support  this
function, ^X$ will be equivalent to ^X! shell-command.

        Sometimes, you would  like  to  get  back to the shell and execute
other commands, without losing  the  current contents of EMACS. The ^XC i-
shell command  shells  out  of  EMACS,  leaving  EMACS in the computer and
executing another command shell. Most systems would allow you to return to
EMACS with the "exit" command.

        On some systems, mainly advanced  versions of UNIX, you can direct
EMACS to "go into the background" with the ^XD suspend-emacs command. This
places  EMACS  in  the  background  returning you to the original  command
shell.  EMACS can then be returned to at any time with the "fg" foreground
command.










































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                            Chapter 11 Summary


        In Chapter 11 introduced  different  ways  to access the computers
shell  or  command  processor  from  within  EMACS.  The commands  in  the
following table were covered in the chapter.


Key Binding             Keystroke                   Effect
execute-program         ^X$             Execute an external program
                                        directly

filter-command          ^X#             Send the current buffer through
                                        a shell filter

i-shell                 ^XC             Escape to a new shell

pipe-command            ^X@             Send the results of an external
                                        shell command to a buffer

shell-command           ^X!             Execute one shell command

suspend-emacs           ^XD             Place EMACS in the background
                                        (some UNIX systems only)




























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                                Chapter 12

                             Keyboard Macros


        In  many  applications,  you  may  need  to  repeat  a  series  of
characters  or  commands  frequently. For example, a paper may require the
frequent repetition of a complex formula or a long name. You may also have
a series of EMACS  commands  that  you  invoke frequently. Keyboard macros
offer a convenient method of recording and repeating these commands.

        Imagine,  for  example,  you  are  writing  a  scholarly paper  on
Asplenium platyneuron, the spleenwort fern.  Even  the  dedicated botanist
would probably find it a task bordering on the agonizing to type Asplenium
platyneuron frequently throughout  the  paper.  An  alternative  method is
'record' the name in a keyboard macro. Try it yourself.

        The  command  ^X(  begin-macro  starts  recording   the   all  the
keystrokes and commands you input.  After you've typed it, enter Asplenium
platyneuron. To stop recording, type ^X) end-macro. EMACS  has  stored all
the keystrokes between the two commands. To repeat the name you've stored,
just  enter  ^XE  execute-macro,  and  the  name  "Asplenium  platyneuron"
appears. You can repeat this action as often as you want, and of course as
with  any  EMACS  command, you may precede it with a numerical argument to
repeat it many times.

        Because EMACS records keystrokes, you may freely intermix commands
and  text. Unfortunately, you can only store one macro at a time. Thus, if
you begin to record  another  macro, the previously defined macro is lost.
Be careful to ensure  that  you've finished with one macro before defining
another.  If you have a series of commands that you would like to 'record'
for future use, use the procedure facilities detailed in chapter 13.


















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                            Chapter 12 Summary


        Chapter  12 covered keyboard macros. You  learned  how  to  record
keystrokes and how to repeat the stored sequence.

Key Binding             Keystroke               Effect

start-macro             ^X(             Starts recording all keyboard input

end-macro               ^X)             Stops recording keystrokes for macro

execute-macro           ^XE             Entire sequence of recorded
                                        keystrokes is replayed






































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                                Chapter 13

                          MicroEMACS Procedures


        Procedures, or macros, are programs that are used to customize the
editor and to  perform  complicated  editing  tasks. They may be stored in
files  or buffers and may be executed using  an  appropriate  command,  or
bound  to  a  particular keystroke. Portions of the standard start-up file
are implemented via procedures, as well  as  the built in help system. The
M-^E run command causes named  procedures to be executed. The execute-file
command allows you to execute a procedure stored in a  disk  file, and the
execute-buffer  command  allows  you  to  execute a procedure stored in  a
buffer. Procedures are stored for easy execution by  executing  files that
contain the store-procedure command.

        In  a command file, the store-procedure  command  takes  a  string
argument which is the name of a procedure to store. These  procedures than
can  be  executed with the M-^E run command. Also, giving the  name  of  a
stored  procedure  within  another  procedure  will  executed  that  named
procedure as if it had been called up with the run command.

        Some fairly length  examples  of MicroEMACS procedures can be seen
by examining the standard files that come with EMACS.  The  emacs.rc  file
(called  .emacsrc) under UNIX) is the MicroEMACS  command  file  which  is
executed when EMACS  is  normally  run.  It contains a number of different
stored procedures along with  the  lines to setup and display the Function
key  window  and  to  call  up  other  procedures  and command files using
function keys.

        There  are  many  different  aspects   to   the   language  within
MicroEMACS. Editor commands are the various commands that manipulate text,
buffers, windows, et cetera,  within  the  editor. Directives are commands
which control  what  lines  get  executed  within  a macro. Also there are
various types  of  variables.  Environmental  variables  both  control and
report  on different aspects of the editor.  User  variables  hold  string
values which may be changed and inspected. Buffer variables allow  text to
be placed into variables. Interactive variable allow the program to prompt
the user for information. Functions can be used to  manipulate  all  these
variables.


13.1  Constants


        All constants and variable contents in EMACS are stored as strings
of  characters.  Numbers  are  stored  digit by digit as characters.  This
allows EMACS to be  "typeless",  not  having  different variables types be


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legal in different contexts. This has the disadvantage of forcing the user
to be  more  careful  about  the  context  of the statements variables are
placed in, but in turn gives them more flexibility in where they can place
variables. Needless  to say, this also allows EMACS's expression evaluator
to be both concise and quick.

        Wherever statements need to have arguments, it is  legal  to place
constants. A constant is a double quote character, followed by a string of
characters, and terminated by another double quote character. To represent
various special characters within a constant, the tilde  (~)  character is
used.  The  character  following the tilde is interpreted according to the
following table:

Sequence        Result
~n                      EMACS newline character (breaks lines)
~r              ^M      carriage return
~l              ^J      linefeed
~~              ~       tilde
~b              ^H      backspace
~f              ^L      formfeed
~t              ^I      tab
~"              "       quote

        Any character  not  in  the  table  which  follows a tilde will be
passed  unmodified.  This  action  is  similar to the  ^Q  quote-character
command available from the keyboard.

        EMACS  may  use  different  characters  for  line  terminators  on
different  computers.  The  ~n combination will always get the proper line
terminating sequence for the current system.

        The double quotes around constants  are not needed if the constant
contains no internal white space and it also does not  happen  to meet the
rules for any  other  EMACS commands, directives, variables, or functions.
This is reasonable useful for numeric constants.


13.2  Variables


        Variables in MicroEMACS procedures  can  be  used to return values
within expressions, as repeat counts to editing commands, or as text to be
inserted into buffers and messages. The value of these  variables  is  set
using  the set ^XA command. For example, to set the current fill column to
64 characters, the following macro line would be used:

        set $fillcol 64

        or to have  the  contents  of  %name  inserted at the point in the
current buffer, the command to use would be:

        insert-string %name




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13.2.1  Environmental Variables


        "What good is a quote if you can't change it?"

        These  variables  are  used to change different aspects of the way
the  editor  works.  Also they will return the current settings if used as
part  of  an  expression.  All  environmental variable names begin with  a
dollar sign ($) and are in lower case.

$acount           The  countdown  of inserted characters  until  the  next
                  save-file.

$asave            The  number of  inserted  characters  between  automatic
                  file-saves in ASAVE mode.

$bufhook          The function named in this variable is run when a buffer
                  is entered. It can be  used to implement modes which are
                  specific to a paricular file or file type.

$cbflags          Current buffer  attribute  flags  (See  appendix  G  for
                  details).

$cbufname         Name of the current buffer.

$cfname           File name of the current buffer.

$cmdhook          Name of function to run before accepting a command. This
                  is by default set to nop.

$cmode            Integer containing the mode of the current  buffer. (See
                  Appendix F for values).

$curchar          Ascii value of the character currently at the point.

$curcol           Current column of point in current buffer.

$curline          Current line of point in current buffer.

$curwidth         Number of columns used currently.

$curwind          Current window number.

$cwline           Current display line in current window.

$debug            Flag to trigger macro debugging.

$deskcolor        Color to use for current desktop, default to BLACK.

$diagflag         If set to TRUE, diagonal dragging of text and mode lines
                  is enabled. If FALSE, text  and  modelines  can  only be
                  dragged horizontally or vertically at one time.



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$discmd           Controls  the  echoing of command  prompts.  Default  is
                  TRUE.

$disinp           Controls the echoing of input  at  the  command prompts.
                  Default is TRUE.

$disphigh         If  set  to   TRUE,  high-bit  characters  (single  byte
                  characters that are  greater  than 127 in value) will be
                  displayed in  a  pseudo-control  format.  The characters
                  "^!"  will  lead  off  the  sequence,  followed  by  the
                  character stripped of its high bit. Default is FALSE.

$exbhook          This  variable holds the name of  a  function  or  macro
                  which is run whenever you are switching out of a buffer.

$fcol             The current line position being displayed  in  the first
                  column of the current window.

$fillcol          Current fill column.

$flicker          Flicker Flag set  to  TRUE  if  IBM CGA set to FALSE for
                  most others.

$fmtlead          lists all  formatter  command  leadin  characters. Lines
                  beginning  with these characters will be considered  the
                  beginning of paragraphs.

$gflags           Global  flags controlling some EMACS internal  functions
                  (See appendix G for details).

$gmode            Global mode flags. (See Appendix F for values).

$hardtab          Number of spaces between  hard  tab  stops.  Normally 8,
                  this can be  used  to change indentation only within the
                  editor.

$hjump            The  number  in  here tells EMACS how  many  columns  to
                  scroll the screen  horizontally when a horizontal scroll
                  is required.

$hscroll          This flag determines if  EMACS  will  scroll  the entire
                  current  window horizontally, or just the current  line.
                  The default value, TRUE, results in  the  entire current
                  window being shifted left and right when the cursor goes
                  off the edge of the screen.

$kill             This contains the first 127 characters currently  in the
                  kill buffer and can  be  used to set the contents of the
                  kill buffer.

$language         [READ ONLY]Contains the name of the  language  which the
                  current  EMACS's message will display. (Currently  EMACS
                  is   available  in  English,  French,  Spanish,   Latin,
                  Portuguese, Dutch, German, and Pig Latin).


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$lastkey          [READ ONLY]Last keyboard character typed.

$lastmesg         [READ ONLY]Contains the text of the  last  message which
                  emacs wrote on the command line.

$line             The current  line in the current buffer can be retrieved
                  and set with this environment variable.

$lterm            Character(s) to write as a line terminator  when writing
                  a file to disk.  Default  is  null,  which causes a '\n'
                  character to  be  written.  Not  all  operating  systems
                  support this.

$lwidth           [READ ONLY]Returns  the  number  of  characters  in  the
                  current line.

$match            [READ ONLY]Last string matched in a search.

$modeflag         Determines if mode lines are currently displayed.

$msflag           If TRUE, the mouse (if  present) is active. If FALSE, no
                  mouse cursor is  displayed,  and  no  mouse  actions are
                  taken.

$numwind          The number of windows displayed.

$oldcrypt         Use the old method  of  encryption  (which  had a bug in
                  it).  Default is FALSE.

$orgrow           Desktop row position of current screen.

$orgcol           Desktop column position of current screen.

$pagelen          Number of screen lines used currently.

$palette          string used to control the palette register  settings on
                  graphics  versions. The usually form consists of  groups
                  of three octal  digits  setting the red, green, and blue
                  levels.

$paralead         Lists all paragraph start characters.

$pending          [READ  ONLY]Flag  to  determine   if   there   are  user
                  keystrokes waiting to be processed.

$popflag          Use pop-up windows. Default is TRUE.

$progname         [READ  ONLY]Always contains the string "MicroEMACS"  for
                  standard MicroEMACS. Could be something else if EMACS is
                  incorporated as part of someone else's program.

$ram                The  amount  of  remaining  memory  if  MicroEMACS was
                  compiled with RAMSIZE set. A debugging tool.



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$readhook         This variable holds the  name  of  a function to execute
                  whenever a  file is read into EMACS. Normally, using the
                  standard emacs.rc file,  this  is  bound  to  a function
                  which places EMACS into  CMODE  if  the extension of the
                  file read is .c or .h.

$region           Contains the  string  of  the  current  region.  It will
                  truncate at the stringsize limit, 255.

$replace          Current default replace string.

$rval             This contains the return value from the  last subprocess
                  which was invoked from EMACS.

$scrname          The current screen name.

$search           Current default search string.

$searchpnt        Set the placement of the of the cursor  on  a successful
                  search match. $searchpnt = 0 (the  default),  causes the
                  cursor to be placed at the end of the  matched  text  on
                  forward searches, and at  the  beginning  of the text on
                  reverse searches. $searchpnt = 1 causes the cursor to be
                  placed  at  the  the  beginning  of  the   matched  text
                  regardless of the search direction, while $searchpnt = 2
                  causes the cursor to be placed at the end.

$seed             Integer seed of the random number generator.

$softtab          Number of spaces inserted by EMACS  when  the handle-tab
                  command  (which is normally bound to  the  TAB  key)  is
                  invoked.

$sres             Current screen  resolution (CGA, MONO, EGA or VGA on the
                  IBM-PC driver. LOW,  MEDIUM,  HIGH or DENSE on the Atari
                  ST1040, NORMAL on most others).

$ssave            If TRUE, when EMACS is asked to save  the  current file,
                  it writes all files out to a temporary file, deletes the
                  original, and then renames the temporary to the old file
                  name. The default value of this is TRUE.

$sscroll          Changes EMACS, when  set  to  TRUE,  to  smoothly scroll
                  windows (one line at a time) when cursoring off the ends
                  of the current window.

$status           [READ ONLY]Status of the  success  of  the  last command
                  (TRUE or FALSE). This is  usually  used  with  !force to
                  check on the success of a search, or a file operation.

$sterm            This is the character used  to  terminate  search string
                  inputs.  The  default  for this is the last key bound to
                  meta-prefix.



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$target           Current target for line moves (setting this fool's EMACS
                  into believing the last command was a line move).

$time             [READ  ONLY]Contains  a  string  corresponding   to  the
                  current date and time. Usually this is in a form similar
                  to "Mon May 09 10:10:58 1988". Not all operating systems
                  will support this.

$tpause           Controls the length of  the  pause  to display a matched
                  fence  when  the  current buffer is in CMODE and a close
                  fence has been typed.

$version          [READ  ONLY]Contains  the  current  MicroEMACS   version
                  number.

$wchars           When set, MicroEMACS uses the characters listed in it to
                  determine if it is in a  word  or  not. If it is not set
                  (the default),  the characters it uses are the upper and
                  lower case letters, and the underscore.

$wline            Number of display lines in current window.

$wraphook         This variable contains the  name  of  an  EMACS function
                  which is executed when  a  buffer is in WRAP mode and it
                  is time to wrap. By default this is bound to wrap-word.

$writehook        This variable  contains the name of an EMACS function or
                  macro which is invoked whenever EMACS attempts  to write
                  a file out to disk. This is executed before the  file is
                  written, allowing you to process a file on the way out.

$xpos             The column the mouse was at the last mouse button press.

$yankflag         Controls  the  placement  of  the  cursor  after  a yank
                  command or  an  insert.  When  $yankflag  is  FALSE (the
                  default), the cursor is placed  at the end of the yanked
                  or inserted text. When it is TRUE, the cursor remains at
                  the start of the text.

$ypos             The  line  which  the mouse was on during the last mouse
                  button press.


13.2.2  User variables


        User variables allow you to  store  strings  and  manipulate them.
These strings can be pieces  of  text,  numbers  (in  text  form),  or the
logical  values  TRUE  and FALSE. These variables can be combined, tested,
inserted into buffers, and  otherwise  used to control the way your macros
execute. At the moment, up  to  512  user  variables  may be in use in one
editing session. All users  variable  names must begin with a percent sign
(%) and may contain any printing characters. Only the first  10 characters



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are significant (IE  differences  beyond the tenth character are ignored).
Most operators will truncate strings to a length of 128 characters.


13.2.3  Buffer Variables


        Buffer variables are special in that they can only be  queried and
cannot be set. What buffer  variables  are  is  a  way to take text from a
buffer and place it in  a variable. For example, if I have a buffer by the
name of RIGEL2, and it contains the text:

        Richmond
        Lafayette
        <*>Bloomington          (where <*> is the current point)
        Indianapolis
        Gary
        =* MicroEMACS 3.11 (WRAP) == rigel2 == File: /data/rigel2.txt =====

        and within a command I reference #rigel2, like:

        insert-string #rigel2

        MicroEMACS would start at the current point in  the  RIGEL2 buffer
and grab all the text up to the end of that line and pass that  back. Then
it  would advance the point to the beginning of the next line. Thus, after
our last command executes, the string "Bloomington" gets inserted into the
current buffer, and the buffer RIGEL2 now looks like this:

        Richmond
        Lafayette
        Bloomington
        <*>Indianapolis         (where <*> is the current point)
        Gary
        =* MicroEMACS 3.11 (WRAP) == rigel2 == File: /data/rigel2.txt =====

        as  you  have  probably noticed, a buffer variable consists of the
buffer name, preceded by a pound sign (#).


13.2.4  Interactive variables


        Interactive variables are actually a method to prompt the user for
a string. This is done  by  using  an  at  sign (@) followed either with a
quoted string, or a variable containing a string. The string is the placed
on the bottom line, and the editor waits for the user to type in a string.
Then the string typed in  by  the  users  is  returned as the value of the
interactive variable. For example:

        set %quest "What file? "
        find-file @%quest




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        will ask the user for a  file  name,  and then attempt to find it.
Note also that complex  expressions  can be built up with these operators,
such as:

set %default "file1"
@&cat &cat "File to decode[" %default "]: "

        which prompts the user with the string:

        File to decode[file1]:


13.3  Functions


        Functions  can  be  used to act  on  variables  in  various  ways.
Functions  can have one, two, or three  arguments.  These  arguments  will
always be  placed  after  the  function  on  the current command line. For
example,  if  we  wanted to increase the current fill column by two, using
emacs's set (^XA) command, we would write:

        set $fillcol &add $fillcol 2
         \      \      \      \     \____second operand
          \      \      \      \_________first operand
           \      \      \_______________function to execute
            \      \_____________________variable to set
             \___________________________set (^XA) command

        Function names  always begin with the ampersand (&) character, and
are  only  significant  to the first three characters after the ampersand.
Functions will normal  expect  one  of  three types of arguments, and will
automatically convert types when needed. Different argument types include:

<num>             an  ascii string of digits which  is  interpreted  as  a
                  numeric value.  Any string which does not  start  with a
                  digit or a minus sign (-) will be considered zero.

<str>             An  arbitrary  string  of  characters.  At  the  moment,
                  strings are limited to 128 characters in length.

<log>             A logical  value  consisting  of  the  string  "TRUE" or
                  "FALSE".  Numeric strings will also evaluate  to "FALSE"
                  if they are equal  to  zero, and "TRUE" if they are non-
                  zero. Arbitrary text  strings  will  have  the  value of
                  "FALSE".

        A list of the currently available functions follows. Functions are
always used in lower case, the uppercase letters in the function table are
the short form of the function (IE &div for ÷).

Numeric Functions:      (returns <num>)

&ADD            <num> <num>     Add two numbers
&SUB            <num> <num>     Subtract the second number from the first


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&TIMes          <num> <num>     Multiply two numbers
&DIVide         <num> <num>     Divide the first number by the second
                                giving an integer result
&MOD            <num> <num>     Return the reminder of dividing the
                                first number by the second
&NEGate         <neg>           Multiply the arg by -1
&LENgth         <str>           Returns length of string
&SINdex         <str1> <str2>   Finds the position of <str2> within
                                <str1>. Returns zero if not found.
&ASCii          <str>           Return the ascii code of the first
                                character in <str>
&RND            <num>           Returns a random integer between 1 and <num>
&ABS            <num>           Returns the absolute value of <num>
&BANd           <num> <num>     Bitwise AND function
&BOR            <num> <num>     Bitwise OR function
&BXOr           <num> <num>     Bitwise XOR function
&BNOt           <num>           Bitwise NOT function

String manipulation functions:  (returns <str>)

&CAT            <str> <str>     Concatenate the two strings to form one
&LEFt           <str> <num>     return the <num> leftmost characters
                                from <str>
&RIGht          <str> <num>     return the <num> rightmost characters
                                from <str>
&MID            <str> <num1> <num2>
                                Starting from <num1> position in <str>,
                                return <num2> characters.
&UPPer          <str>           Uppercase <str>
&LOWer          <str>           Lowercase <str>
&CHR            <num>           return a string with the character
                                represented by ascii code <num>
>C                            returns a string of characters
                                containing a EMACS command input from
                                the user
>K                            return a string containing a single
                                keystroke from the user
&ENV            <str>           If the operating system is capable, this
                                returns the environment string associated
                                with <str>
&BIND           <str>           return the function name bound to the
                                keystroke <str>
&XLATE          <str1> <str2> <str3>
&FINd           <str>           Find the named file <str> along the
                                path and return its full file specification
                                or an empty string if none exists
&TRIM           <str>           Trim the trailing whitespace from a string

Logical Testing functions:      (returns <log>)

&NOT            <log>           Return the opposite logical value
&AND            <log1> <log2>   Returns TRUE if BOTH logical arguments
                                are TRUE
&OR             <log1> <log2>   Returns TRUE if either argument


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                                is TRUE
&EQUal          <num> <num>     If <num> and <num> are numerically
                                equal, return TRUE
&LESs           <num1> <num2>   If <num1> is less than <num2>, return
                                TRUE.
&GREater        <num1> <num2>   If <num1> is greater than, or equal to
                                <num2>, return TRUE.
&SEQual         <str1> <str2>   If the two strings are the same, return
                                TRUE.
&SLEss          <str1> <str2>   If <str1> is less alphabetically than
                                <str2>, return TRUE.
&SGReater       <str1> <str2>   If <str1> is alphabetically greater than
                                or equal to <str2>, return TRUE.
&EXIst          <str>           Does the named file <str> exist?

&ISNum          <num>           Is the given argument a legitimate number?

Special Functions:

&GROup          <num>           Return group <num> as set by a MAGIC
                                mode search.

&SUPper         <str1> <str2>   Translate the first char in <str1> to
                                the first char in <str2> when uppercasing.

&SLOwer         <str1> <str2>   Translate the first char in <str1> to
                                the first char in <str2> when lowercasing.

&INDirect       <str>           Evaluate <str> as a variable.

        This last function deserves more  explanation.  The  &IND function
evaluates its argument, takes the resulting string, and then uses it  as a
variable name. For example, given the following code sequence:

        ; set up reference table

        set %one        "elephant"
        set %two        "giraffe"
        set %three      "donkey"

        set %index "two"
        insert-string &ind %index

        the string "giraffe" would have been inserted at the point  in the
current buffer.  This  indirection  can  be  safely  nested up to about 10
levels.


13.4  Directives


        Directives are commands which  only  operate  within  an executing
procedure, IE they do not make  sense  as  a single command. As such, they



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cannot  be called up singly or bound to  keystroke.  Used  within  command
files, they control what lines are executed and in what order.

        Directives always start with the  exclamation  mark  (!) character
and must be the first non-wite space placed on a line. Directives executed
interactively (via the execute-command-line command) will be ignored.


13.4.1  !ENDM Directive


        This directive is used  to  terminate  a  procedure or macro being
stored. For example, if a file is being executed contains the text:

        ;       Read in a file in view mode, and make the window red

        store-procedure get-red-viewed-file
                find-file @"File to view: "
                add-mode "view"
                add-mode "red"
        !endm

        print "[Consult procedure has been loaded]"

        only  the  lines  between the store-macro command  and  the  !ENDM
directive  are  stored  in   procedure   get-red-viewd-file.   Both  named
procedures and numbered macroes  (via  the  store-macro command) should be
terminated with this directive.


13.4.2  !FORCE Directive


        When MicroEMACS executes a  procedure,  if  any command fails, the
procedure is terminated at that point. If a line is  preceded  by a !FORCE
directive, execution continues whether  the  command  succeeds or not. For
example:

        ;       Merge the top two windows

        save-window             ;remember what window we are at
        1 next-window           ;go to the top window
        delete-window           ;merge it with the second window
        !force restore-window   ;This will continue regardless
        add-mode "red"
        Often this  is used together with the $status environment variable
to test if a command succeeded. For example:

        set %seekstring "String to Find: "
        !force search-forward %seekstring
        !if &seq $status TRUE
                print "Your string is Found"
        !else
                print "No such STRING!"


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        !endif


13.4.3  !IF, !ELSE, and !ENDIF Directives


        This  directive  allows  statements  only  to  be  executed  if  a
condition specified in the directive is met. Every line following  the !IF
directive, until the first !ELSE or !ENDIF directive, is only  executed if
the expression following the !IF directive evaluates to a TRUE  value. For
example,  the  following  commands creates the  portion  of  a  text  file
automatically. (yes believe me,  this  will  be  easier to understand then
that last explanation....)

        !if &sequal %curplace "timespace vortex"
                insert-string "First, rematerialize~n"
        !endif
        !if &sequal %planet "earth"     ;If we have landed on earth...
                !if &sequal %time "late 20th century"  ;and we are then
                        write-message "Contact U.N.I.T."
                !else
                        insert-string "Investigate the situation....~n"
                        insert-string "(SAY 'stay here Sara')~n"
                !endif
        !else
                set %conditions @"Atmosphere conditions outside? "
                !if &sequal %conditions "safe"
                        insert-string &cat "Go outside......" "~n"
                        insert-string "lock the door~n"
                !else
                        insert-string "Dematerialize..try somewhen else"
                        newline
                !endif
        !endif


13.4.4  !GOTO Directive


        Flow can be controlled within  a  MicroEMACS  procedure  using the
!GOTO directive. It takes as an  argument  a  label. A label consists of a
line starting with an asterisk (*) and then an  alphanumeric  label.  Only
labels in the currently  executing  procedure can be jumped to, and trying
to jump to a  non-existing  label terminates execution of a procedure. For
example:

        ;Create a block of DATA statements for a BASIC program

                insert-string "1000 DATA "
                set %linenum 1000

        *nxtin
                update-screen           ;make sure we see the changes
                set %data @"Next number: "


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                !if &equal %data 0
                        !goto finish
                !endif

                !if &greater $curcol 60
                        2 delete-previous-character
                        newline
                        set %linenum &add %linenum 10
                        insert-string &cat %linenum " DATA "
                !endif

                insert-string &cat %data ", "
                !goto nxtin

        *finish

                2 delete-previous-character
                newline


13.4.5  !WHILE and !ENDWHILE Directives


        This  directive  allows  you to set up repetitive tasks easily and
efficiently. If a group of statements need to be executed while  a certain
condition is true, enclose them with a while loop. For example,

        !while &less $curcol 70
                insert-string &cat &cat "[" #stuff "]"
        !endwhile

        places  items from buffer "item" in the  current  line  until  the
cursor is at  or past column 70. While loops may be nested and can contain
and be the targets of !GOTOs with no ill effects. Using  a  while  loop to
enclose a repeated  task  will  run  much  faster  than  the corresponding
construct using !IFs.


13.4.6  !BREAK Directive


        This  lets you abort out of the  most  executing  currently  inner
while  loop,  regardless  of  the  condition.  It  is  often used to abort
processing for error conditions. For example:

;       Read in files and substitute "begining" with "beginning"

        set %filename #list
        !while ¬ &seq %filename "<end>"
!force          find-file %filename
                !if &seq $status FALSE
                        write-message "[File read error]"
                        !break
                !endif


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                beginning-of-file
                replace-string "begining" "beginning"
                save-file
                set %filename #list
        !endwhile

        This while loop will process files until the list is  exhausted or
there is an error while reading a file.


13.4.7  !RETURN Directive


        The !RETURN Directive causes the current procedure to exit, either
returning to the caller (if any) or to interactive mode. For example:

        ;       Check the monitor type and set %mtyp

        !if &sres "CGA"
                set %mtyp 1
                !return
        !else
                set %mtyp 2
        !endif

        insert-string "You are on a MONOCHROME machine!~n"






























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                                Chapter 14

                     Debugging MicroEMACS Procedures


        When developing new procedures, it is very convenient  to  be able
to  trace  their  execution  to  discover errors. The  $debug  environment
variable enables procedure  debugging.  While this variable is TRUE, emacs
will stop at each line it intends to execute and allow you to view it, and
issue a number of  different  commands to help determine how the procedure
is executing.

        For example, we will step  through the procedure which toggles the
function key window off. The first  thing  to  do, is to set $debug, using
the ^XA  set  command.  Type  ^XA and emacs will prompt you on the command
line with "Variable to set: ". Type in "$debug" and  press  the enter key.
Emacs will then ask "Value: ". Type in  "TRUE"  (in  capital  letters) and
press the enter key.

        While macro debugging is enabled (as it is now) emacs  will report
each time a variable is assigned  a  value, by displaying the variable and
its value on the command line. Right now,

((($debug <- TRUE)))

        appears on the command line to  tell  you that $debug now has been
assigned the value of TRUE. Press the space bar to continue.

        Now,  lets  try  to  debug  a  macro.  Press  function key 5 which
normally toggles the function key window. The first thing that appears is:

<<<[Macro 01]:!if %rcfkeys>>>

        At this point, emacs is waiting  for  a command. It is prepared to
see  if the user variable %rcfkeys is TRUE, and execute some lines if they
are. Suppose we want to see  the  value  of this variable, type the letter
"e"  to  evaluate  an expression. Emacs will prompt with "EXP:  ".    Type
"%rcfkeys"  followed  by  the  enter  key. Emacs should then respond  with
"TRUE" to indicate that the function key window is currently on screen.

        Press the space bar to allow the !if directive to execute.   Emacs
will decide that it is TRUE, and then display the next command to execute.

<<<[Macro 01]:!goto rcfoff>>>

        Notice emacs tells us  what  procedure  we are currently executing
(in this case, the macro bound to execute-macro-1). Press  the  space  bar
again to execute the !goto directive.


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<<<[Macro 01]:save-window>>>

        Emacs is saving the position of the current window so that  it can
attempt to return to it after it has brought up the function key window.

        [...THIS CHAPTER IS NOT FINISHED...]


















































                                                                        64






Key Bindings, What they are and why            MicroEMACS Reference Manual








                                Chapter 15

                   Key Bindings, What they are and why


        One of the features which makes MicroEMACS very  adaptable  is its
ability to use different keystrokes  to  execute  different  commands. The
process  of  changing  the particular command  a  key  invokes  is  called
rebinding. This  allows  us  to  make  the  editor look like other popular
editors and programs.

        Each command in MicroEMACS has a name which is  used  for  binding
purposes. For example, the command to move the  cursor  down  one  page is
called  next-line and is normally bound to the ^N key. If you decided that
you  also  wanted  to use the ^D key to move the cursor down one line, you
would use the M-K  bind-to-key  command. EMACS would respond with ": bind-
to-key " on the command line and allow you to type in a command name. Then
type  in  the  name of the command  you want to change, in this case next-
line, followed by the <NL> key. EMACS will then wait for  you  to  type in
the keys you want to activate the named function. Type  a  single ^D. From
now on, typing  ^D will cause EMACS to move down one line, rather than its
original function of deleting characters.

        To find out the name of a command, consult the list of valid EMACS
commands in Appendix B. Also, you can use the ^X? describe-key  command to
look up the name of a command. Type ^X? and  then  the  key  to  use  that
command, and EMACS will show you the name of the command.

        After you have  experimented  with changing your key bindings, you
may  decide that you want to change some  bindings  permanently.  To  have
EMACS  rebind keys to your pleasure each time you start EMACS, you can add
statements to the end of your startup file (emacs.rc or .emacsrc depending
on the system). For example,

        bind-to-key next-line ^D

        Notice,  that  control   D   character  in  the  startup  file  is
represented visibly as an uparrow key followed by a capital D. To know how
to  represent  any  keys you want to bind, use the describe-key command on
the key, and use the sequence that is displayed.

        bind-to-key split-current-window FN1

        This example would make function key 1 activate  the  command that
splits the current window in two.

        EMACS will let you define a large number of keys, but  will report
"Binding table FULL!" when it runs out of  space  to  bind  keys. Normally


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MicroEMACS Reference Manual            Key Bindings, What they are and why


EMACS will allow up to 512 key bindings (including approx.  300 originally
bound keys).

        If you want to get a current listing of all  the  commands and the
keys bound to them, use the describe-bindings command.  Notice,  that this
command is not bound to any keys!


















































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                                Appendix A

            MicroEMACS Command Line Switches and Startup Files


        When EMACS first executes, it always searches for  a  file, called
.emacsrc under most UNIX  systems  or emacs.rc on most other systems which
it will execute as EMACS macros before it reads in the named source files.
This file normally  contains  EMACS  macroes  to bind the function keys to
useful functions and load various useful macros. The contents of this file
will probably vary from system to system and can be  modified  by the user
as desired.

        When searching for this file, EMACS looks for it  in  this  order.
First, it attempts to find a definition for "HOME" in the  environment. It
will look in that directory first. Then it searches  all  the  directories
listed in the "PATH" environment variable. Then it looks through a list of
predefined standard directories which vary from system to system. Finally,
failing  all of these, it looks in the current directory. This is also the
same  method EMACS uses to look up any files to execute, and to find  it's
help file EMACS.HLP.

        On computers that call  up  EMACS via a command line process, such
as MSDOS  and  UNIX,  there  are different things that can be added to the
command line to  control  the  way  EMACS operates. These can be switches,
which  are  a  dash  ('-')  followed  by  a  letter,  and  possible  other
parameters, or a startup file specifier, which is an at sign  '@' followed
by a file name.

@<file>           This causes the named file to be executed instead of the
                  standard emacs.rc file before emacs reads  in  any other
                  files.  More  than  one  of  these can be placed on  the
                  command line, and they will  be  executed  in  the order
                  that they appear.

-C                The following source files  on  the  command line can be
                  changed  (as opposed to being in  VIEW  mode).  This  is
                  mainly used to cancel the  effects of the -v switch used
                  previously in the same command line.

-E                This flag causes emacs to automatically run  the startup
                  file "error.cmd" instead of emacs.rc.  This  is  used by
                  various  C compilers for error processing (for  example,
                  Mark Williams C).

-G<num>           Upon entering EMACS, position the  cursor  at  the <num>
                  line of the first file.



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MicroEMACS Reference ManualroEMACS Command Line Switches and Startup Files


-I<var> <value>   Initialize an EMACS variable with <value>.  This  can be
                  useful to force EMACS to  start  in  a  particular mode.
                  (For example,  invoke  EMACS  with  "emacs  -i$sres  VGA
                  foo.bar" to edit file foo.bar in VGA 50 line mode  on an
                  IBM-PC).

-K<key>           This key tells emacs to  place the source files in CRYPT
                  mode and read it in using <key> as  the  encryption key.
                  If no key is listed  immediately  after  the  -K switch,
                  EMACS  will  prompt  for a key, and not echo it as it is
                  typed.

-R                This  places  EMACS   in  "restricted  mode"  where  any
                  commands allowing the user  to  read  or write any files
                  other  than  the  ones listed on the  command  line  are
                  disabled. Also all commands allowing the user  access to
                  the operating system are disabled. This makes EMACS very
                  useful as a  "safe"  environment  for  use  within other
                  applications and especially used as a remote  editor for
                  a BBS or electronic bulletin board system.

-S<string>        After EMACS is started,  it  automatically  searches for
                  <string> in the first source file.

-V                This tells EMACS that all the following sources files on
                  the command line should be in VIEW mode  to  prevent any
                  changes being made to them.





























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                                Appendix B

                            Command Completion


        Some versions of  MicroEMACS  will allow you to abbrieviate buffer
names, command names and file names as you enter them.  To  use this, type
in the first  few characters of the name you wish, and then hit either the
space bar, the META key or  the  TAB  key. MicroEMACS will then attempt to
look at the list of all the availible names and if there is only one which
will fit, it will choose  that  name.  If  there  are  several  names that
quailify, as many characters as are common to ALL of them will be entered.
If  there  are  no  possible  matches,  the  bell  will  ring to  indicate
MicroEMACS can not complete the command.

        For example, if you have several files in  your  current directory
with the following names:

        prog1.c
        prog1.obj
        prog1.exe
        prog1.doc
        program.one
        project.one
        test.c
        tes

        and you enter the ^X^F find-file command, if you type 'p' and then
hit the space  bar, EMACS will respond by typing the 'r' that is common to
all the above file names begining with 'p'. If you then type 'ogr' and hit
the tab key, EMACS will respond with 'am.one' and  automatically  hit  the
enter key for you.

        If you were to instead type  an  'a'  and hit the space bar, EMACS
will beep, informing you that there is no possible match.

        If you type a 'te' and hit the space bar, EMACS will then type the
following  's',  but it will not automatically  enter  it  because  it  is
possible you mean to get to the test.c file.

        Buffer  name,  and  command name completion is  available  in  all
versions of MicroEMACS. File name  completion is available on UNIX BSD4.3,
the Atari ST, the AMIGA and under MSDOS.







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                                Appendix C

                           MicroEMACS Commands


        Below  is  a complete list of the  commands  in  EMACS,  the  keys
normally used to do the command,  and  what the command does. Remember, on
some  computers  there may also be additional  ways  of  using  a  command
(cursor keys and special function keys for example).

Command                         Binding         Meaning
abort-command            ^G     This allows the user to abort out of any
                                command that is waiting for input

add-mode                 ^XM    Add a mode to the current buffer

add-global-mode          M-M    Add a global mode for all new buffers

append-file              ^X^A   Write a buffer to the end of a file

apropos                  M-A    List out commands whose name contains
                                the string specified

backward-character       ^B     Move one character to the left

begin-macro              ^X(    Begin recording a keyboard macro

beginning-of-file        M-<    Move to the beginning of the file in
                                the current buffer

beginning-of-line        ^A     Move to the beginning of the current line

bind-to-key              M-K    Bind a key to a function

buffer-position          ^X=    List the position of the cursor in the
                                current window on the command line

case-region-lower        ^X^L   Make a marked region all lower case

case-region-upper        ^X^U   Make a marked region all upper case

case-word-capitalize     M-C    Capitalize the following word

case-word-lower          M-L    Lower case the following word

case-word-upper          M-U    Upper case the following word

change-file-name         ^XN    Change the name of the file in the


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                                current buffer

change-screen-size      (none)  Change the number of lines of the screen
                                currently being used

change-screen-width     (none)  Change the number of columns of the
                                screen currently being used

clear-and-redraw         ^L     Clear the physical screen and redraw it

clear-message-line      (none)  Clear the command line

copy-region              M-W    Copy the currently marked region into
                                the kill buffer

count-words              M-^C   Count how many words, lines and
                                characters are in the current marked region

ctlx-prefix              ^X     Change the key used as the ^X prefix

cycle-screens            A-C    Bring the rearmost screen to front

delete-blank-lines       ^X^O   Delete all blank lines around the cursor

delete-buffer            ^XK    Delete a buffer which is not being
                                currently displayed in a window

delete-mode              ^X^M   Turn off a mode in the current buffer

delete-global-mode       M-^M   Turn off a global mode

delete-next-character    ^D     Delete the character following the cursor

delete-next-word         M-D    Delete the word following the cursor

delete-other-windows     ^X1    Make the current window cover the entire
                                screen

delete-previous-character^H     Delete the character to the left of the
                                cursor

delete-previous-word     M-^H   Delete the word to the left of the cursor

delete-screen            A-D    Delete a screen

delete-window            ^X0    Remove the current window from the screen

describe-bindings       (none)  Make a list of all legal commands

describe-functions      (none)  Make a list of all legal functions

describe-variables      (none)  Make a list of all environment
                                and user variables



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describe-key             ^X?    Describe what command is bound to a
                                keystroke sequence

detab-region             ^X^D   Change all tabs in a region to the
                                equivalent spaces

display                 ^XG     Prompts the user for a variable and
                                displays its current value

dump-variables           none   Places into a buffer the current values
                                of all environment and user variables

end-macro                ^X)    stop recording a keyboard macro

end-of-file              M->    Move cursor to the end of the current buffer

end-of-line              ^E     Move to the end of the current line

end-of-word             (none)  Move the point just past the end of
                                the current word

entab-region             ^X^E   Change multiple spaces to tabs where
                                possible

exchange-point-and-mark  ^X^X   Move cursor to the last marked spot,
                                make the original position be marked

execute-buffer          (none)  Execute a buffer as a macro

execute-command-line    (none)  Execute a line typed on the command
                                line as a macro command

execute-file            (none)  Execute a file as a macro

execute-macro            ^XE    Execute the keyboard macro (play back
                                the recorded keystrokes)
execute-macro-<n>       (none)  Execute numbered macro <N> where <N> is
                                an integer from 1 to 40

execute-named-command    M-X    Execute a command by name

execute-procedure        M-^E   Execute a procedure by name

execute-program         ^X$     Execute a program directly (not through
                                an intervening shell)

exit-emacs               ^X^C   Exit EMACS. If there are unwritten,
                                changed buffers EMACS will ask to confirm

fill-paragraph           M-Q    Fill the current paragraph

filter-buffer            ^X#    Filter the current buffer through an
                                external filter



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find-file                ^X^F   Find a file to edit in the current window

find-screen              A-F    Bring the named screen to front,
                                creating it if needed

forward-character        ^F     Move cursor one character to the right

goto-line                M-G    Goto a numbered line

goto-mark                M-^G   Goto a numbered mark

goto-matching-fence      M-^F   Goto the matching fence

grow-window              ^X^    Make the current window larger

handle-tab               ^I     Insert a tab or set tab stops

hunt-forward             A-S    Hunt for the next match of the last
                                search string

hunt-backward            A-R    Hunt for the last match of the last
                                search string

help                     M-?    Read EMACS.HLP into a buffer and display it

i-shell                  ^XC    Shell up to a new command processor

incremental-search       ^XS    Search for a string, incrementally

indent-region            M-(    Indent the current region one tab

insert-file              ^X^I   insert a file at the cursor in the
                                current file

insert-space             ^C     Insert a space to the right of the cursor

insert-string           (none)  Insert a string at the cursor

kill-paragraph           M-^W   Delete the current paragraph

kill-region              ^W     Delete the current marked region, moving
                                it to the kill buffer

kill-to-end-of-line      ^K     Delete the rest of the current line

label-function-key      (none)  Set the text on a function key label
                                (HP150 only)

list-buffers             ^X^B   List all existing buffers

list-screens             A-B    List all existing screens

macro-to-key             M-^K   Bind a key to a macro



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meta-prefix              <ESC>  Key used to precede all META commands

mouse-move-down          MSa

mouse-move-up            MSb

mouse-resize-screen      MS1

mouse-region-down        MSe

mouse-region-up          MSf

move-window-down         ^X^N   Move all the lines in the current window down

move-window-up           ^X^P   Move all the lines in the current window up

name-buffer              M-^N   Change the name of the current buffer

narrow-to-region         ^X<    hides all text not in the current region

newline                  ^M     Insert a <NL> at the cursor

newline-and-indent       ^J     Insert a <NL> at the cursor and indent
                                the new line the same as the preceding line

next-buffer              ^XX    Bring the next buffer in the list into
                                the current window

next-line                ^N     Move the cursor down one line

next-page                ^V     Move the cursor down one page

next-paragraph           M-N    Move cursor to the next paragraph

next-window              ^XO    Move cursor to the next window

next-word                M-F    Move cursor to the beginning of the
                                next word

nop                     (none)  Does nothing

open-line                ^O     Open a line at the cursor

overwrite-string        (none)  Overwrite a string at the cursor

pipe-command             ^X@    Execute an external command and place
                                its output in a buffer

pop-buffer              (none)  Display a buffer temporarily, paging

previous-line            ^P     Move cursor up one line

previous-page            ^Z     Move cursor up one page



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previous-paragraph       M-P    Move back one paragraph

previous-window          ^XP    Move the cursor to the last window

previous-word            M-B    Move the cursor to the beginning of the
                                word to the left of the cursor

print                   (none)  Display a string on the command line
                                (a synonim to write-message)

query-replace-string     M-^R   Replace all of one string with another
                                string, interactively querying the user

quick-exit               M-Z    Exit EMACS, writing out all changed buffers

quote-character          ^Q     Insert the next character literally

read-file                ^X^R   Read a file into the current buffer

redraw-display           M-^L   Redraw the display, centering the
                                current line

remove-mark             (none)  Remove a numbered mark

resize-window            ^XW    Change the number of lines in the
                                current window

restore-window          (none)  Move cursor to the last saved window

replace-string           M-R    Replace all occurrences of one string
                                with another string from the cursor
                                to the end of the buffer

reverse-incremental-search^XR   Search backwards, incrementally

run                      M-^E   Execute a named procedure

save-file                ^X^S   Save the current buffer if it is changed

save-window             (none)  Remember current window (to restore later)

scroll-next-up           M-^Z   Scroll the next window up

scroll-next-down         M-^V   Scroll the next window down

search-forward           ^S     Search for a string

search-reverse           ^R     Search backwards for a string

select-buffer            ^XB    Select a buffer to display in the
                                current window

set                      ^XA    Set a variable to a value



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set-encryption-key       M-E    Set the encryption key of the current buffer

set-fill-column          ^XF    Set the current fill column

set-mark                        Set the mark

shell-command            ^X!    Causes an external shell to execute
                                a command

show-files              (none)  Pop up a list of files from the
                                specified directory

shrink-window            ^X^Z   Make the current window smaller

source                  (none)  Execute a file as a macro

split-current-window     ^X2    Split the current window in two

store-macro             (none)  Store the following macro lines to a
                                numbered macro

store-procedure         (none)  Store the following macro lines to a
                                named procedure

transpose-characters     ^T     Transpose the character at the cursor
                                with the character to the left

trim-region              ^X^T   Trim any trailing white space from a region

unbind-key               M-^K   Unbind a key from a function

undent-region            M-)    Remove a leading indent from a region

universal-argument       ^U     Execute the following command 4 times

unmark-buffer            M-~    Unmark the current buffer (so it is
                                no longer changed)

update-screen           (none)  Force a screen update during macro execution

view-file                ^X^V   Find a file,and put it in view mode

widen-from-region        ^X>    restores hidden text (see narrow-to-region)

wrap-word               (none)  Wrap the current word, this is an
                                internal function

write-file               ^X^W   Write the current buffer under a new
                                file name

write-message           (none)  Display a string on the command line

yank                     ^Y     yank the kill buffer into the current
                                buffer at the cursor


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MicroEMACS Bindings                            MicroEMACS Reference Manual








                                Appendix D

                           MicroEMACS Bindings


        Below is a complete  list  of the key bindings used in MicroEMACS.
This can be used as a wall chart reference for MicroEMACS commands.

                  Default Key Bindings for MicroEmacs 3.11

 ^A   Move to start of line           ESC A   Apropos (list some commands)
 ^B   Move backward by characters     ESC B   Backup by words
 ^C   Insert space                    ESC C   Initial capitalize word
 ^D   Forward delete                  ESC D   Delete forward word
 ^E   Goto end of line                ESC E   Reset Encryption Key
 ^F   Move forward by characters      ESC F   Advance by words
 ^G   Abort out of things             ESC G   Go to a line
 ^H   Backward delete
 ^I   Insert tab/Set tab stops
 ^J   Insert <NL>, then indent
 ^K   Kill forward                    ESC K   Bind Key to function
 ^L   Refresh the screen              ESC L   Lower case word
 ^M   Insert <NL>                     ESC M   Add global mode
 ^N   Move forward by lines           ESC N   Goto End paragraph
 ^O   Open up a blank line
 ^P   Move backward by lines          ESC P   Goto Begining of paragraph
 ^Q   Insert literal                  ESC Q   Fill current paragraph
 ^R   Search backwards                ESC R   Search and replace
 ^S   Search forward                  ESC S   Suspend (BSD only)
 ^T   Transpose characters
 ^U   Repeat command four times       ESC U   Upper case word
 ^V   Move forward by pages           ESC V   Move backward by pages
 ^W   Kill region                     ESC W   Copy region to kill buffer
 ^Y   Yank back from killbuffer       ESC X   Execute named command
 ^Z   Move backward by pages          ESC Z   Save all buffers and exit

 ESC ^C   Count words in region       ESC ~   Unmark current buffer
 ESC ^E   Execute named procedure
 ESC ^F   Goto matching fence         ESC !   Reposition window
 ESC ^H   Delete backward word        ESC <   Move to start of buffer
 ESC ^K   Unbind Key from function    ESC >   Move to end of buffer
 ESC ^L   Reposition window           ESC .  Set mark
 ESC ^M   Delete global mode          ESC space    Set mark
 ESC ^N   Rename current buffer       ESC rubout   Delete backward word
 ESC ^R   Search & replace w/query        rubout   Backward delete
 ESC ^S   Source command file
 ESC ^V   Scroll next window down
 ESC ^W   Delete Paragraph


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MicroEMACS Reference Manual                            MicroEMACS Bindings


 ESC ^X   Execute command line
 ESC ^Z   Scroll next window up

 ^X <   Narrow-to-region           ^X ?   Describe a key
 ^X >   Widen-from-region          ^X !   Run 1 command in a shell
 ^X =   Show the cursor position   ^X @    Pipe shell command to buffer
 ^X ^   Enlarge display window     ^X #   Filter buffer thru shell filter
 ^X 0   Delete current window      ^X $   Execute an external program
 ^X 1   Delete other windows       ^X (   Begin macro
 ^X 2   Split current window       ^X )   End macro
                                   ^X A   Set variable value
 ^X ^B   Display buffer list       ^X B   Switch a window to a buffer
 ^X ^C   Exit MicroEMACS           ^X C   Start a new command processor
 ^X ^D   Detab line                ^X D   Suspend MicroEMACS (BSD4.2 only)
 ^X ^E   Entab line                ^X E   Execute macro
 ^X ^F   Find file                 ^X F   Set fill column
 ^X ^I   Insert file
                                   ^X K   Delete buffer
 ^X ^L   Lower case region
 ^X ^M   Delete Mode               ^X M   Add a mode
 ^X ^N   Move window down          ^X N   Rename current filename
 ^X ^O   Delete blank lines        ^X O   Move to the next window
 ^X ^P   Move window up            ^X P   Move to the previous window
 ^X ^R   Get a file from disk      ^X R   Incremental reverse search
 ^X ^S   Save current file         ^X S   Incremental forward search
 ^X ^T   Trim line                 (Incremental search
 ^X ^U   Upper case region                not always available)
 ^X ^V   View file
 ^X ^W   Write a file to disk      ^X W   resize Window
 ^X ^X   Swap "." and mark         ^X X   Use next buffer
 ^X ^Z   Shrink window             ^X Z   Enlarge display window

Usable Modes
WRAP     Lines going past right margin "wrap" to a new line
VIEW     Read-Only mode where no modifications are allowed
CMODE    Change behavior of some commands to work better with C
EXACT    Exact case matching on search strings
OVER     Overwrite typed characters instead of inserting them
CRYPT    Current buffer will be encrypted on write, decrypted on read
MAGIC    Use regular expression matching in searches
ASAVE    Save the file every 256 inserted characters

WHITE/CYAN/MAGENTA/YELLOW/BLUE/RED/GREEN/BLACK  Sets foreground color
white/cyan/magenta/yellow/blue/red/green/black  Sets background color












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                                Appendix E

                            Numeric Arguments















































79






MicroEMACS Reference Manual                  Numeric Arguments to Commands








                                Appendix F

                      Numeric Arguments to Commands


        In general, preceding a MicroEMACS command with a numeric argument
n  causes the command to be executed n times.  However, there are a  great
many commands for which this has  no  effect, simply because it would make
no sense for the command to be executed more than once.    There  are also
commands  that  take  advantage  of  the numeric arguments to alter  their
behavior subtly or unsubtly.  The  following  is a list of these commands.
Commands  that are not affected at all by  numeric  arguments  are  listed
afterwards.

backward-character
                  A negative argument invokes forward-character.

change-screen-size
                  With no arguments, the  number  of  rows defaults to the
                  largest.  Otherwise, set the screen size to n.

change-screen-width
                  With no arguments, the number of columns defaults to the
                  largest.  Otherwise, set the screen width to n.

clear-and-redraw  With an argument, centers the window around  the current
                  cursor position.

delete-next-character
                  A negative argument invokes delete-previous-character.

delete-next-word  With an argument of  0,  will  not delete the whitespace
                  trailing  the  deleted word. A  negative  argument  will
                  cause nothing to happen.

delete-previous-character
                  A negative argument invokes delete-next-character.

delete-previous-word
                  An negative  or  zero  argument  will  cause  nothing to
                  happen.

detab-region      Without  an argument, detab-region changes hard tabs  to
                  spaces in the lines between  the  mark  and  the cursor.
                  With an argument n, the commands detab n lines - forward
                  if n is positive, backwards if not.

end-of-word       A negative argument invokes next-word.


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Numeric Arguments to Commands                  MicroEMACS Reference Manual


entab-region      Without an argument, entab-region changes spaces to hard
                  tabs in the lines between the mark and the cursor.  With
                  an argument n, the commands entab n lines - forward if n
                  is positive, backwards if not.

exchange-point-and-mark
                  Swap the current  cursor  position  and  mark  number n.
                  Without an argument, n defaults to 0.

exit-emacs        Providing a numeric  argument  n  causes  two  things to
                  happen.  First, no checking  for  modified  buffers will
                  occur.  Second, MicroEMACS exits with a status of n.

forward-character
                  A negative argument invokes backward-character.

goto-line         An argument n will be taken as the line number to go to.
                  Without  an  argument,  you  will  be asked for  a  line
                  number.  In either case, the line number must  be  1  or
                  greater.

goto-mark         Go to mark number n.  Without an argument, n defaults to
                  0.

grow-window       A negative argument  invokes shrink-window.  An argument
                  of 0 causes no action.

handle-tab        Without an  argument,  handle-tab  deals  with  the  tab
                  character, whether  it should be a single "hard" tab, or
                  expanded as spaces.  With an argument n, $softtab is set
                  to n.

hunt-backward     The command will hunt n  times.  The command will report
                  failure if it cannot find its pattern the nth time, even
                  if has  found an occurrence of the pattern before number
                  n.  A negative argument invokes hunt-forward.

hunt-forward      The command will hunt n  times.  The command will report
                  failure if it cannot find its pattern the nth time, even
                  if has  found an occurrence of the pattern before number
                  n.  A negative argument invokes hunt-backward.

kill-to-end-of-line
                  With no argument n, the command  deletes  all characters
                  to the end  of the line.  If it is already at the end of
                  the line, it will delete the newline.  With a positive n
                  as an  argument,  the  command  will  delete  n complete
                  lines,  newline  character and all,  starting  from  the
                  cursor.  With n equal to zero, the  command  deletes all
                  text from the cursor to the beginning of  the  line, but
                  will not  delete past the newline character.  A negative
                  n is illegal.




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MicroEMACS Reference Manual                  Numeric Arguments to Commands


list-buffers      With  a  numeric argument, INVISIBLE  buffers  are  also
                  listed.

move-window-down  With a negative argument, invokes move-window-up.

move-window-up    With a negative argument, invokes move-window-down.

next-buffer       With an argument n, the nth buffer after the current one
                  is selected, and read in if necessary.   Any  buffers in
                  between the current buffer and  the  target  buffer that
                  have not yet been read in are read.

next-line         A negative argument invokes previous-line.

next-page         Without an argument, the window is scrolled forward by a
                  full page. With an  argument  n,  the window is scrolled
                  forwards   by  n  lines.    Negative  arguments   invoke
                  previous-page.

next-paragraph    A negative argument invokes previous-paragraph.

next-window       With a positive argument n,  the nth window from the top
                  becomes the working window.  With  a  negative argument,
                  the nth  window  from  the  bottom  becomes  the working
                  window.

next-word         A negative argument invokes next-word.

previous-line     A negative argument invokes next-line.

previous-page     Without an argument, the window is scrolled  backward by
                  a full page. With an  argument n, the window is scrolled
                  backwards by n lines.  Negative  arguments  invoke next-
                  page.

previous-paragraph
                  A negative argument invokes next-paragraph.

previous-window   With  a positive argument n, the  nth  window  from  the
                  bottom becomes the  working  window.    With  a negative
                  argument,  the  nth  window  from  the  top  becomes the
                  working window.

previous-word     A negative argument invokes next-word.

query-replace-string
                  With a numeric argument,  n  occurrences  of  the search
                  string  may  be  replaced,  depending  upon  the  user's
                  response.     The  count  is  based  on  the  number  of
                  occurrences found, not  the number of positive responses
                  from the user.

quick-exit        Saves all modifed buffers, and exits with a status of n.



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Numeric Arguments to Commands                  MicroEMACS Reference Manual


redraw-display    With no argument, or when n is 0, the window is adjusted
                  so  that  the  cursor is in  the  center.    When  n  is
                  positive, the window  is  adjusted so that the cursor is
                  on the nth line of the screen.  When n is  negative, the
                  window is adjusted so  that  the  cursor  is on the last
                  line of the window, regardless of the magnitude of n.

remove-mark       Remove mark number  n.   Without an argument, n defaults
                  to 0.

replace-string    Will replace n occurrences of the search string with the
                  replacement string.  Otherwise,  with  no  argument, all
                  occurrences from  the cursor position to the end of file
                  are replaced.

resize-window     Requires an argument which must be positive.

scroll-next-down  Behavior is same as with next-page.

scroll-next-up    Behavior is same as with previous-page.

search-forward    The  command  will  search n times.   The  command  will
                  report failure if it cannot  find  its  pattern  the nth
                  time, even if has found  an  occurrence  of  the pattern
                  before number n.  A  negative  argument  invokes search-
                  reverse.

search-reverse    The  command  will  search n times.   The  command  will
                  report failure if it cannot  find  its  pattern  the nth
                  time, even if has found  an  occurrence  of  the pattern
                  before number n.  A  negative  argument  invokes search-
                  forward.

select-buffer     Without an argument, the buffer is  simply  displayed in
                  the  window.    With an argument, the buffer is not only
                  displayed, but also given the attribute INVISIBLE.

set               If using the set  command  interactively,  preceding the
                  command with a numeric argument then makes it unecessary
                  for the command to ask for the variable's value (it will
                  still ask for  the  variable's  name).    If  used  in a
                  command line, then the command

                          set <variable name> <number>

is identical to

                          <number> set <variable name>

set-fill-column   With  an argument, the fill column is set  to  n.    The
                  default argument is 1.

set-mark          Set mark number n.  Without an argument,  n  defaults to
                  0.


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MicroEMACS Reference Manual                  Numeric Arguments to Commands


shrink-window     A negative argument  invokes shrink-window.  An argument
                  of 0 causes no action.

split-current-window
                  With n = 1,  the  new  upper  window becomes the current
                  window.   Any other numeric argument makes the new lower
                  window  the  current  window.    With  no  argument, the
                  current window becomes the  new  upper  or  lower window
                  depending upon whether the  cursor  was  in the upper or
                  lower half of the old window.

store-macro       Since macroes are numbered, a numeric  argument  must be
                  provided. These numbered macroes are being phased out in
                  preference for named macros.

store-procedure   If the command  is  provided a numeric argument, it will
                  assume that store-macro is actually being called.

trim-region       Without an argument, trim-region removes spaces and tabs
                  from  the  end  of  the  lines between the mark and  the
                  cursor. With an argument n,  the commands trim n lines -
                  forward if n is positive, backwards if not.


F.1  Commands unaffected by numeric arguments.


abort-command            describe-functions       narrow-to-region
add-global-mode          describe-key             nop
add-mode                 describe-variables       pipe-command
append-file              display                  pop-buffer
apropos                  end-macro                print
back-from-tag-word       end-of-file              re-tag-word
begin-macro              end-of-line              read-file
beginning-of-file        execute-command-line     restore-window
beginning-of-line        execute-program          reverse-incremental-
bind-to-key              fill-paragraph           search
buffer-position          filter-buffer            save-file
case-region-lower        find-file                save-window
case-region-upper        find-screen              set-encryption-key
change-file-name         goto-matching-fence      shell-command
clear-message-line       help                     suspend-emacs
copy-region              i-shell                  tag-word
count-words              incremental-search       transpose-characters
cycle-screens            insert-file              unbind-key
delete-blank-lines       kill-region              unmark-buffer
delete-buffer            macro-to-key             update-screen
delete-global-mode       mouse-move-down          view-file
delete-mode              mouse-move-up            widen-from-region
delete-other-windows     mouse-region-down        wrap-word
delete-screen            mouse-region-up          write-file
delete-window            mouse-resize-screen      write-message
describe-bindings        name-buffer



                                                                        84






Supported machines                             MicroEMACS Reference Manual








                                Appendix G

                            Supported machines


        The following table  lists  all the hardware/compilers for which I
currently support MicroEMACS. This is  not exclusive of all machines which
MicroEMACS will run on, but I have either run it myself,  or  had  a first
hand report of it running.

Hardware        OS              Compiler        Comments
VAX 780         UNIX V5         native
                UNIX V7         native
                BSD 4.2         native          job control supported
                VMS             native          SMG & ANSI support

SUN             SUNOS 3 & 4     native
                                gcc

NCR Tower       UNIX V5         native

IBM-RT PC       BSD 4.3         native
                AIX             native

HP9000          UNIX V5         native

Fortune 32:16   UNIX V7         native

IBM-PC          MSDOS           LATTICE 3       Large CODE/Large DATA
                 2.0 & 3.2      AZTEC 3.4e      Large CODE/Large DATA
                                TURBO C 2.0     LARGE memory model
                                MSC 6.0
                                *MWC 86
                SCO XENIX       native

HP150           MSDOS           Lattice 2.15    Function key labels
                                Turbo C 2.0             for the touch screen

HP110           MSDOS           Lattice 2.15
                                Aztec 3.4e
                                Turbo C 2.0

*Data General 10
                MSDOS           Lattice 2.1  Texas Instruments Professional
                MSDOS           Lattice 2.15

Amiga           Intuition       Lattice 3.03
                                Aztec 3.6


85






MicroEMACS Reference Manual                             Supported machines


ST520           TOS             Mark Williams C Spawns under MSH
                                Lattice 3.1     (no shell commands)

Fujitsu FMR     MSDOS           MSC 6.0
   series

NEC 9800        MSDOS           Turbo 2.0       Function key support
   series                       MSC 6.0

HP3000 series   MPE             native

Systems to be supported (IE some code is already written:)
Macintosh       System 7        Lightspeed C

*means that I do not own or have access to the listed compiler and/or
 machine and must rely upon others to help support it.








































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                                Appendix H

                              Function Keys


        All environments now support a set of machine independant bindings
for function keys. Below is a list of these bindings (not all of these are
supported on all systems).

                        Function keys in MicroEmacs

        function        Function        ^function       Alt-function
 f1)      FN1            S-FN1            FN^1            A-FN1
 f2)      FN2            S-FN2            FN^2            A-FN2
 f3)      FN3            S-FN3            FN^3            A-FN3
 f4)      FN4            S-FN4            FN^4            A-FN4
 f5)      FN5            S-FN5            FN^5            A-FN5
 f6)      FN6            S-FN6            FN^6            A-FN6
 f7)      FN7            S-FN7            FN^7            A-FN7
 f8)      FN8            S-FN8            FN^8            A-FN8
 f9)      FN9            S-FN9            FN^9            A-FN9
f10)      FN0            S-FN0            FN^0            A-FN0

home)     FN<                             FN^<
CsUp)     FNP                             FN^P
PgUp)     FNZ                             FN^Z
CsLf)     FNB                             FN^B
 5  )
CsRt)     FNF                             FN^F
 End)     FN>                             FN^>
CsDn)     FNN                             FN^N
PgDn)     FNV                             FN^V
 Ins)     FNC                             FN^C
 Del)     FND                             FN^D
















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MicroEMACS Reference Manual                        Machine Dependent Notes








                                Appendix I

                         Machine Dependent Notes


        This  appendix   lists   some   notes   specific   to   individual
implementations of MicroEMACS. Every attempt  has been made to allow EMACS
to  be identical on all machines, but we have also tried to take advantage
of function keys,  cursor  keys,  mice,  and  special  screen  modes where
possible.


I.1  IBM-PC/XT/AT and its clones


        The  IBM-PC family of computers is supported  with  a  variety  of
different display adapters. EMACS will attempt to discover what adapter is
connected  and  use  the  proper  driver  for it. Below is a list  of  the
currently supported video adapters:

Adapter                         $sres           Original mode used
Monochrome Graphics Adapter     MONO            MONO
Color Graphics Adapter          CGA             CGA
                                CGA40           CGA40
Enhanced Graphics Adapter       EGA             CGA
Video Graphics Adapter          VGA             CGA
                                VGA12

        If a driver for  a  Microsoft compatable mouse is installed on the
system,  EMACS will use the mouse in text mode and allow the user all  the
standard  mouse  functions.  The mouse cursor will appear to be a block of
color in the color opposite of it's background.

        EMACS also takes advantage of various function keys  and  the keys
on the keypad on an IBM-PC. The function keys are  initially  not bound to
any  particular  functions  (except by the emacs.rc startup file), but the
keypad keys do default to the following:

Keypad key      Function
Home            beginning-of-file
CSRS UP         previous-line
Pg Up           previous-page
CSRS LEFT       backward-character
CSRS RIGHT      forward-character
End             end-of-file
CSRS DOWN       next-line
Pg Dn           Next-page



                                                                        88






Machine Dependent Notes                        MicroEMACS Reference Manual


        All these special keys are indicated in EMACS macroes  by  use  of
the FN prefix. Below is a list of many of the keys and the  codes  used to
specify them. Also the codes may  be  gotten by using the describe-key (^X
?) command on the suspect key.

Compiling under TURBO C

        To  compile MicroEMACS under TURBO C,  set  the  TURBO  integrated
environment with the following options:

        Memory model            LARGE
        Floating point          NONE
        Default char type       UNSIGNED
        Data alignment          BYTE
        Merge duplicate strings ON
        Standard stack frame    off
        Test stack overflow     off

        Optimize for                    SIZE
        Use register optimization       ON
        Register optimization           ON
        Jump optimization               ON

        Initialize segments     OFF
        Stack warnings          OFF

        Names: Code names
                Segment name    *




























89






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I.2  HP 150


        This machine from Hewlett  Packard  is  very  unusual for an MSDOS
machine.  It  has  a touch screen and is very function  key  oriented.  An
additional command, label-function-key  allows  you to place labels on the
on screen function key labels. A numeric argument indicates which function
key to  label  (one  through  eight) and then the program prompts for a 16
character label, which will be used  as  two lines of eight characters. To
label function key three with "save file" from a macro, you would use:

3 label-function-key "save              file"

        Notice the 4 spaces  after  "save". This forces "file" to begin on
the second line of the label.







































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I.3  Atari 520/1040ST


        The ATARI ST family of computers have a dual personality. They may
use either  a  monochrome  or  a  color  screen. EMACS supports two screen
resolutions on each monitor.

                                   NOTE

     When  you  set  MicroEMACS up on your system, please remember to
     install  it on the desktop as a GEM  application.  If  you  have
     EMACS  set as a TOS application, the  mouse  will  not  function
     properly,  and  EMACS  will alert you to this problem by beeping
     the bell.

Monitor $sres size #color $palette format
Color   LOW     40x25   16      000111222333444555666777
        MEDIUM  80x25   4       000111222333
Mono    HIGH    80x25   2       000
        DENSE   80x50   2       000

        The $palette environment variable can be used to change what color
is  associated  with  each color name. With a color monitor, each group of
three digits indicates an octal number specifying the RED, GREEN  and BLUE
levels of that  color. Each color digit can vary from 0 to 7. For example,
the initial setting of $palette in LOW resolution is:

        000700070770007707077777

        which broken up is:

        000 700 070 770 007 707 077 777

        which means:

        000     Black
        700     Red
        070     Green
        770     Yellow
        007     Blue
        707     Magenta
        077     Cyan
        777     White

        Also the mouse buttons are bound to mouse  functions  as described
in the chapter about mice. The cursor keys and the function keys are bound
similarly to IBM-PC.

        Files  generated by EMACS on the ATARI ST  have  a  single  return
character  at the end of each line, unlike the desktop files which want to
have two returns. This makes it display files strangely from  GEM's [SHOW]
option, but  makes  the  files  port  to  other computers much nicer. When


91






MicroEMACS Reference Manual                        Machine Dependent Notes


compiling  MicroEMACS,  the  ADDCR symbol in estruct.h will cause emacs to
generate line ending sequences compatible with GEM.

        Currently, when operating under  the  Mark  Williams  MSH program,
EMACS can shell out and perform external commands. This capability will be
added later for the Beckmeyer shell and under GEMDOS.


















































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I.4  Amiga 1000


        The Commodore  AMIGA 1000 version of MicroEMACS does fully support
the  mouse,  window  resizing  and  the  close  gadget.  It runs in medium
resolution, using the colors defined for the workbench.

                     Note about Compiling MicroEMACS

             If you are compiling the sources on the AMIGA to produce
     an executable image, and you  are using the Lattice compiler, be
     sure to give the CLI command 'STACK 40000'  before  compiling to
     make  sure  the  compiler   has   sufficient   stack   space  to
     successfully complete compilation.








































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I.5  UNIX V5, V7, and BSD4.[23]


        MicroEMACS under UNIX  utilizes  the  TERMCAP  library  to provide
machine independent  screen functions. Make sure that termcap is available
and properly set on your account before attempting to use MicroEMACS.

        Under  systems  which  support  job  control, you can use the  ^XD
suspend-emacs command to place EMACS into the background.  This  carries a
much smaller overhead than bringing up a new shell under EMACS. EMACS will
properly redraw the screen when you bring it back to the foreground.

        If the symbol VT100 has been set to  1  in  the  estruct.h options
file, EMACS will recognize the key sequence <ESC>[ as the lead in sequence
for the FN function key prefix.

        With the addition of some very  machine/operating  system specific
code, EMACS can prevent two or more people from modifying the same file at
the same time. The upper level of  a  set  of  functions  to  provide file
locking exist in the source file LOCK.C.  It requires two machine specific
functions written and linked into EMACS for it to operate properly.

        char *dolock(fname)

        char *fname;

        dolock() locks a file, preventing others from modifying it. If
        it succeeds, it returns NULL, otherwise it returns a pointer to
        a string in the form "LOCK ERROR: explanation".

        char *undolock(fname)

        char *fname;

        undolock() unlocks a file, allowing others to modifying it. If
        it succeeds, it returns NULL, otherwise it returns a pointer to
        a string in the form "LOCK ERROR: explanation".

















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Machine Dependent Notes                        MicroEMACS Reference Manual




I.6  DEC VMS operating system


TERMINALS

        Depending upon  the  options  set  in  ESTRUCT.H,  MicroEMACS uses
either  the capabilities of VMS SMG, working with  any  terminal  that  is
defined in SMGTERMS.TXT or  TERMTABLE.TXT  (see  your  SMG manual for more
information), or the ANSI  escape  sequences.  Full keyboard support, with
function  keys  and  everything,  is  provided for VT100 and VT200  series
compatible terminals. Mouse support is  provided  under  the  ANSI version
only at this time. Mouse support is provided for  the  VSII  workstation's
VT220  terminal  emulator,  and other terminal emulators that use the same
escape sequences for mouse control. (There is some partial support for the
BBN  BitGraph  mouse  sequences  in  the  sources,  but  this  is not  yet
complete). Terminals may have up to 100 lines and 160 columns.

        The  maximum  terminal  size is 256 columns and 72 row. If you run
MicroEMACS on a terminal that is larger than this, MicroEMACS  will reduce
it to these limits while you are editing.

Flow control
        Some terminals will require the  use of XON/XOFF flow control when
used with MicroEMACS. When XON/XOFF flow control is used, you will  not be
able to use functions bound to ^S or ^Q, and should use bind-to-key to put
these functions on other keys. MicroEMACS does not change the flow control
characteristics  of  your  terminal line while  it  is  running.  If  your
terminal requires flow control, you should:

        $ SET TERM/HOSTSYNC/TTSYNC

        before  entering  MicroEMACS.  If  you  are  on  a  VSII  emulated
workstation terminal,  are using the SSU multi-session protocol (VT330 and
VT340  with  SSU enabled), or are certain  that  your  terminal  does  not
require XON/XOFF flow control, you should

        $ SET TERM /HOSTSYNC/NOTTSYNC

        This will allow you to use ^S and ^Q for MicroEMACS commands. Note
that  if  you  are using a VSII with VWS V3.2 or later, you must leave the
/HOSTSYNC enabled in order for  the cross/session cut and paste capability
to work properly.


KEYBOARD

        The VMS version  understands  the LK201 functions of VT200 series,
vt300 series,  and compatible terminals and terminal emulators, and allows
you  to  bind  to them as function keys. In addition,  the  VT100  numeric
keypad, in application mode, is  available  as  function  keys. MicroEMACS
will  only  put  the keypad into application mode for you  if  the  KEYPAD
option is set in ESTRUCT.H. In this situation, MicroEmacs will detect your


95






MicroEMACS Reference Manual                        Machine Dependent Notes


kepad's state, and restore it to that state upon  exiting.  If  MicroEMACS
has  not been compiled with this option, you may still put the keypad into
application mode by issuing the  command  "SET  TERM  /APPLICATION" before
entering MicroEMACS.

VT200 keys

Note that F1 through F5 are local function keys on DEC terminals.

F6         = FN6        FIND = FNS
FN7        = FN7        INSERT = FNC
F8         = FN8        REMOVE = FND
F9         = FN9        SELECT = FN@
F10        = FN0        PREV = FNZ
F11        = S-FN1      NEXT = FNV
F12        = S-FN2      Arrow Up = FNP
F13        = S-FN3      Arrow Down = FNN
F14        = S-FN4      Arrow Right = FNF
HELP (F15) = S-FN5      Arrow Left = FNB
DO (F16)   = S-FN6
F17        = S-FN7
F18        = S-FN8
F19        = S-FN9
F20        = S-FN0

VT100 and VT200 numeric keypad in application mode

PF1 = FN^1      PF2 = FN^2      PF3 = FN^3      PF4   = FN^4
7   = A-7       8   = A-8       9   = A-9       -     = A--
4   = A-4       5   = A-5       6   = A-6       ,     = A-,
1   = A-1       2   = A-2       3   = A-3       ENTER = A-E
0   = A-0       .  = A-.

                                 WARNING

             The VMS version  contains code for interpreting function
     keys that are  sent  as  Ansi  sequences that begin with the ESC
     character.    Because  of  this,  MicroEMACS  cannot  process an
     incoming ESC until it knows  what character follows it. This can
     cause problems with terminating search and  replace  strings. If
     you use ESC as the  meta-prefix character (which is the default)
     you must type  one  additional  keystroke  following  ESC before
     emacs will recognize that you  have  edited  the  search command
     prompt,  and  are   continuing.  (The  additional  character  is
     processed normally be MicroEMACS, it is NOT discarded.)

             MicroEMACS must wait long enough for  the  network delay
     that might be involved  between  seeing  the  ESC and seeing the
     characters that follow it. If holding down one of the arrow keys
     causes characters to drop  into  your file, then you may want to
     alter    the    delay    yourself.    The    logical    variable
     MICROEMACS$SHORTWAIT may  be set to vary that delay. The default
     delay is 400ms (4  tenths  of a second). The equivalent value in
     MICROEMACS$SHORTWAIT is 4000000.


                                                                        96






Machine Dependent Notes                        MicroEMACS Reference Manual


Special case for BBN BItGraph

        If you are using the  BBN BitGraph, execute the following commands
before entering MicroEMACS, and you will get mouse support:

        $ esc[0,8] = 27
        $ microemacs$mouse_enable == esc+":5;6;L"+esc+":0;63;;;;;;;;;9;16;c"
        $ microemacs$mouse_disable == esc+":5;1;L"+esc+":0;0c"
        $ exit

        Do NOT do this for any other terminals.

Search List for EMACS.RC

        VMS  MicroEMACS  will  first  search logical name MICROEMACS$LIB:,
then    SYS$LOGIN:,    then    the    current   directory,   and   finally
"sys$sysdevice:[vmstools]" when looking for startup files or help files.

        Please use MICROEMACS$LIB:,  and  allow  the  secondary  search of
[vmstools] to become archaic. If desired, MICROEMACS$LIB may be defined to
be  a  VMS search list that first searches a user directory,  and  then  a
system directory.

        Generally, you should create  a  private  directory where you keep
all your .CMD files, and in your LOGIN.COM $DEFINE a logical name to point
to this area.

        In addition to whatever commands you have in  your  EMACS.RC file,
one command you should certainly include is "set $ssave FALSE".  The "safe
save" mechanism, which writes a buffer to a temporary  file,  deletes  the
old  version of a file, and then moves the temporary file to its permanent
name, works wonderfully on most systems, but makes no sense on  VMS, which
maintains older versions of a file.

Using MicroEMACS as a subprocess
        MicroEmacs can now  be  kept  in  a subprocess. You can arrange to
start emacs only once in  a job, and to re-attach to it each time you want
to  use  it.  This is optional. To use this feature, install MicroEMACS in
the following way:

1. MicroEMACS contains two images. ME.EXE is a small program for
    starting and stopping the Emacs subprocess. The source for ME.
    is in ME.C, and should not be linked into MESHR.EXE. MESHR.EXE
    is the actual MicroEMACS image. The name "MESHR" is required for
    MAIL/NOTES support, see next section for details.

2. Make sure that the SYS$SHARE search list includes MESHR.EXE. If you
   don't have the privilages to move MESHR.EXE into SYS$SHARE, you
   can $ DEFINE the MESHR logical name to be the full name and location of
   the MESHR.EXE program. For example, you could store all of these
   programs in the MICROEMACS$LIB: search list, and say:

                $ DEFINE MESHR microemacs$lib:meshr.exe



97






MicroEMACS Reference Manual                        Machine Dependent Notes


3. Put ME.EXE in MICROEMACS$LIB and the following line in your LOGIN.COM:

                $ me :== $microemacs$lib:me

4. Put a line in your EMACS.RC that will

            bind-to-key suspend-emacs ^C  ; use your usual exit-emacs key

        Now,  use the "$ ME" command  to  invoke  microemacs.  Subseqeuent
invocations in the same  job  will re-use the existing subprocess. You can
use  the full capabilty of the microemacs command line in the first and in
all subsequent invocations of ME.

        WARNING:

        MicroEMACS will ALWAYS read in new copies of any files you specify
on the command line, even if you are  already  editing  it.  If you edit a
file a  second  time  with  the same MicroEMACS, you will get a NEW buffer
with  ANOTHER copy of the file. The old buffer is still there also. It  is
easy,  in this situation, to accidently edit in a WRONG BUFFER, and if you
write out an obsolete buffer, you will loose earlier edits!

        This is considered a bug and  may  be  fixed in a later version of
MicroEMACS. To avoid this situation, do not specify a file on  the command
line if MicroEMACS already has that file in a buffer. Use  the "find-file"
MicroEMACS command instead.


        Using MICROEMACS with MAIL and NOTES:

        With VMS V5 and later versions, the MAIL  interface  to Microemacs
is much simplified. With VMS V5, the MESHR.EXE image does  NOT  have to be
installed  as  a known image to be used as a callable  editor  from  MAIL.
Therefore, to  use  MicroEMACS  as  your  VMS  MAIL editor, simply add the
following lines to your LOGIN.COM:

                $ DEFINE MAIL$EDIT CALLABLE_ME
                $ MAIL :== MAIL/EDIT

        and make sure  that  the SYS$SHARE search list includes MESHR.EXE.
If you don't have privs or permission to move  MESHR.EXE  into  SYS$SHARE,
you  can $ DEFINE the MESHR logical name to be the full name and  location
of  the  MESHR.EXE program. For example, you  could  store  all  of  these
programs in the MICROEMACS$LIB: search list, and say:

                $ DEFINE MESHR microemacs$lib:meshr.exe

        Note that this is the same location as is required for  using kept
MicroEMACS.

        To abort sending a  message,  exit  MicroEMACS without writing out
the mail message file.




                                                                        98






Machine Dependent Notes                        MicroEMACS Reference Manual


        To  use  MicroEMACS  as your VAX NOTES editor, issue the following
command to VAX NOTES:

                NOTES> SET PROFILE/EDIT=(ME,CALL)

        Note,  if you are still in the dark ages of VMS V4, you will  have
to  either  install MESHR as a known  image,  or  following  the  original
"Second way" instructions given in the existing appendix F.6 of  the older
MicroEMACS manual (previous to version 3.10).

Second way, as described in older versions

        In the event that you cannot get your system  manager  to  INSTALL
MicroEMACS as known image, you can use the following technique:

1. In MICROEMACS$LIB:MEMAIL.COM, put the following command file:

$! Use on VAX/VMS as MAIL$EDIT for using MicroEMACS as mail editor.
$ if "''P1'" .NES. "_NL:" then if "''P1'" .NES. "" then copy 'P1' 'P2'
$ define/user sys$input sys$output
$ me 'P2'
$ exit

This file may have come with your MicroEMACS kit.

2. In your LOGIN.COM, put the following lines:

$       me :== $MICROEMACS$LIB:MESHR.EXE ! Assumes meshr.exe is there
$       define mail$edit microemacs$lib:me_edit.com

3. In NOTES, give the command

NOTES> SET PROFILE/EDIT=(@MicroEMACS$lib:me_edit.com,SPAWN)

Building MicroEMACS for VMS

The configuration options are set in file estruct.h:

- Under the category of "Machine/OS definitions", set VMS to "1" and all
others to "0".

- Under "Compiler definitions", set all selections to "0". Selecting
VMS implies that you are using VAXC.

- Under "Special keyboard definitions", be sure "VT100" is set to "0".
This option is not required for the VMS version, it is for other
systems using ANSI terminal support. VMS in combination with SMG or
ANSI already handles the special characteristics of Ansi keyboards.

- Under "Terminal Output definitions", set either ANSI or SMG to "1"
and all others to "0". As stated previously, only ANSI supports the
mouse at this time.

- Under "Configuration options", you may select as you wish, with the


99






MicroEMACS Reference Manual                        Machine Dependent Notes


following notes:

    - COLOR     support does not exist for VMS, even when using
                color workstations.
    - MOUSE     support should be enabled if you have any VSII
                workstations. Only supported under the ANSI driver.
    - KEYPAD    support recognises whether your keypad is already
                in application mode or not, and puts your keypad
                in its correct state on exit.
    - XNONOFF   automatically allows you to use control-S or
                control-Q in MicroEMACS, by disabling the TTSYNC
                characteristic. This option should not be set if
                MicroEMACS might be used on DecStations or VT100s.
                It also should not be used with slow terminals or
                terminal emulators connected to fast terminal lines.
    - RMSIO     support should absolutely be used. This option
                allows the writing and reading of files in VMS's
                variable-length format, as opposed to STREAM-LF,
                and cuts down on file writing and reading time by
                approximately two thirds.
    - OPTMEM    support may be used on VMS versions 5.0 and higher.
                It substitutes the C library's memory allocation
                calls for the native VAX calls, and gives a speed
                improvement.

        If you have  MMS,  you  can  use the supplied DESCRIP.MMS to build
MicroEMACS. Otherwise, the  command  file  MEMAKE.COM  has  been provided.
These  files assume that you are using SMG as your terminal driver. If you
are using ANSI, then you must replace SMG with ANSI in the command and opt
files.  If  you  do not have MMS or are missing MEMAKE.COM, simply compile
each module with "CC", and link with the command:

        $ LINK MESHR/OPTION/SHARE

        Note that the executable  filename  must end in "SHR" in order for
MicroEMACS to be  used as a callable editor from MAIL or NOTES.  (Method 1
above.)

        If you edit  any  of  the  Emacs  sources, note that any global or
external data must be declared as "noshare" in order for the  VMS callable
editor support to work properly. This  applies  to all global data used in
the VMS version, but not to routines or to "static  "data.   The "noshare"
declaration is #define'd away on non-VMS systems. If you fail to  do this,
VMS will not allow you to INSTALL MicroEMACS as a sharable library.












                                                                       100






Mode Flags                                     MicroEMACS Reference Manual








                                Appendix J

                                Mode Flags


        The two environment variables, $cmode and $gmode, contain a number
the  corresponds to the modes set for the current buffer and the editor as
a whole. These are encoded as the sum of the following numbers for each of
the possible modes:

WRAP      1             Word wrap
CMODE     2             C indentation and fence match
SPELL     4             Interactive spell checking (Not Implemented Yet)
EXACT     8             Exact matching for searches
VIEW     16             Read-only buffer
OVER     32             Overwrite mode
MAGIC    64             Regular expressions in search
CRYPT   128             Encryption mode active
ASAVE   256             Auto-save mode

        So, if you wished to set the current buffer to have  CMODE, EXACT,
and MAGIC on, and all  the  others  off,  you  would add up the values for
those three,  CMODE  2   +  EXACT 8  +  MAGIC 64 = 74, and use a statement
like:

        set $cmode 74

        or, use the binary or operator to combine the different modes:

        set $cmode &bor &bor 2 8 64

Internal Flags

        Some  of the ways EMACS controls its  internal  functions  can  be
modified by the  value  in  the  $gflags environment variable. Each bit in
this variable will be used to control a different function.

GFFLAG          1       If this bit is set to zero, EMACS will not
                        automatically switch to the buffer of the
                        first file after executing the startup macros.
GFSDRAW         2       If this bit is set to one, supress redraw events.

Current buffer flags

        The $cbflags environment  variable  allows the user to modify some
of the  characteristics of the current buffer. The various characteristics
are encoded as the sum of the following numbers:



101






MicroEMACS Reference Manual                                     Mode Flags


BFINVS          1       Internal invisible buffer
BFCHG           2       Changed since last write
BFTRUNC         4       buffer was truncated when read
BFNAROW         8       buffer has been narrowed

        Only  the  invisible  and changed flags can be modified by setting
the  $cbflags variable. The truncated file and  narrowed  flags  are  read
only.
















































                                                                       102






Index                                          MicroEMACS Reference Manual








                                     Index


        $cbflags 101                     default string 14
        $debug 63                        delete-blank-lines 8
        $gflags 101                      delete-buffer 28
        .emacsrc 48, 67                  delete-global-mode 30
        <NL> 13                          delete-mode 30
                                         delete-next-character 7
        A                                delete-next-word 8
        add-global-mode 30               delete-previous-character
        add-mode 3, 30                        7
        ASAVE mode 30                    delete-previous-word 8
                                         describe-bindings 66
        B                                describe-key 65
        backward-character 3             desk accessories 21
        BBS 68                           desktop 23
        begin-macro 46                   detab-region 41
        beginning-of-file 4, 7           dragging 22
        beginning-of-line 4
        bind-to-key 65                   E
        buffer 4, 6, 27                  emacs.rc 48, 67
                                         encryption 31
        C                                end-macro 46
        case-region-lower 40             end-of-file 4
        case-word-capitalize 40          end-of-line 4
        case-word-lower 40               entab-region 41
        case-word-upper 40               error parsing 67
        change-file-name 36              EXACT mode 31
        clear-and-redraw 19              execute-buffer 48
        CMODE mode 31                    execute-file 48
        color 30                         execute-macro 46
        color pallette 52                execute-program 43
        command line 17                  exit-emacs 8
        command processor 43
        command.com 43                   F
        control key 1                    file locking 94
        control-x 1                      fill column 34
        copy-region 11                   fill-paragraph 7, 39
        CRYPT mode 31, 68                filter 43
        cshell 43                        filter-buffer 43
        cursor keys 4                    find-file 18, 27
        cut 23                           forward-character 3
        cycle-screens 24                 function key window 48

        D                                G
        debugging 63                     grow-window 19



103






MicroEMACS Reference Manual                                          Index



        H                                Q
        handle-tab 41                    query-replace 15
        Help File 67                     query-replace-string 15,
        HOME environment variable             33, 34
             67
        horizontal scrolling 22          R
                                         rebinding 65
        I                                redraw-display 19
        i-shell 44                       region 22
                                         regular expressions 32
        K                                replace-string 14, 33, 34
        kill buffer 11                   resize-window 19
        kill-region 10                   restricted mode 68
        kill-to-end-of-line 8            run 48

        L                                S
        label-function-key 90            save-file 4
        list-buffers 28, 30              screen 6, 23
                                         screen resolution 53
        M                                scroll-next-down 18
        MAGIC mode 32                    scroll-next-up 18
        mark 10                          search-forward 13
        meta key 1                       search-reverse 14
        mode line 2, 6                   select-buffer 27
        modes 3, 30                      set 41
        mouse 21, 52                     set-encryption-key 31
        mouse cursor 21                  set-fill-column 39
        move-window-down 18              set-mark 10
        move-window-up 18                shell 43
                                         shell-command 43
        N                                shrink-window 19
        newline 1                        special keys 1
        next-buffer 27                   split-current-window 17
        next-line 3                      startup files 67
        next-paragraph 4                 store-procedure 48
        next-word 3                      suspend-emacs 44, 94
        numeric arguments 80             switches 67

        O                                T
        open-line 7                      tab handling 41
        open-window 17                   tabs 51, 53
        OVER mode 34                     termcap 94
                                         text window 2
        P                                trim-region 41
        paste 23
        PATH environment variable        V
             67                          vertical scrolling 22
        pipe-command 43                  VIEW mode 34
        point 10
        previous-line 3                  W
        previous-paragraph 4             window 6
        previous-window 17               windows 2, 17
        previous-word 3                     Creating 17


                                                                       104






Index                                          MicroEMACS Reference Manual


           Deleting 18                   write-file 4
           Resizing 19                   writefile 36
        WRAP mode 34
        wrap-word 34                     Y
        wrapping text 39                 yank 11



















































105













                                 Contents





     Chapter 1  Basic Concepts                                      1
        1.1  Keys and the Keyboard  . . . . . . . . . . . . . . . . 1
        1.2  Getting Started  . . . . . . . . . . . . . . . . . . . 1
        1.3  Parts and Pieces . . . . . . . . . . . . . . . . . . . 2
        1.4  Entering Text  . . . . . . . . . . . . . . . . . . . . 2
        1.5  Basic cursor movement  . . . . . . . . . . . . . . . . 3
        1.6  Saving your text . . . . . . . . . . . . . . . . . . . 4

     Chapter 2  Basic Editing--Simple Insertions and Deletions      6
        2.1  A Word About Windows, Buffers, Screens, and Modes  . . 6
        2.2  Insertions . . . . . . . . . . . . . . . . . . . . . . 7
        2.3  Deletions  . . . . . . . . . . . . . . . . . . . . . . 7

     Chapter 3  Using Regions                                      10
        3.1  Defining and Deleting a Region . . . . . . . . . . .  10
        3.2  Yanking a Region . . . . . . . . . . . . . . . . . .  11

     Chapter 4  Search and Replace                                 13
        4.1  Forward Search . . . . . . . . . . . . . . . . . . .  13
        4.2  Exact Searches . . . . . . . . . . . . . . . . . . .  14
        4.3  Backward Search  . . . . . . . . . . . . . . . . . .  14
        4.4  Searching and Replacing  . . . . . . . . . . . . . .  14
        4.5  Query-Replace  . . . . . . . . . . . . . . . . . . .  15

     Chapter 5  Windows                                            17
        5.1  Creating Windows . . . . . . . . . . . . . . . . . .  17
        5.2  Deleting Windows . . . . . . . . . . . . . . . . . .  18
        5.3  Resizing Windows . . . . . . . . . . . . . . . . . .  19
        5.4  Repositioning within a Window  . . . . . . . . . . .  19

     Chapter 6  Using a Mouse                                      21
        6.1  Moving around with the mouse . . . . . . . . . . . .  21
        6.2  Dragging around  . . . . . . . . . . . . . . . . . .  21
        6.3  Cut and Paste  . . . . . . . . . . . . . . . . . . .  22
        6.4  Screens  . . . . . . . . . . . . . . . . . . . . . .  23
        6.5  Resizing a Screen  . . . . . . . . . . . . . . . . .  23
        6.6  Moving a Screen  . . . . . . . . . . . . . . . . . .  23
        6.7  Creating a Screen  . . . . . . . . . . . . . . . . .  23
        6.8  Switching to a Screen  . . . . . . . . . . . . . . .  24
        6.9  Deleting a Screen  . . . . . . . . . . . . . . . . .  24

     Chapter 7  Buffers                                            27




                                     i









     Chapter 8  Modes                                              30
        8.1  ASAVE mode . . . . . . . . . . . . . . . . . . . . .  30
        8.2  CMODE mode . . . . . . . . . . . . . . . . . . . . .  31
        8.3  CRYPT mode . . . . . . . . . . . . . . . . . . . . .  31
        8.4  EXACT mode . . . . . . . . . . . . . . . . . . . . .  31
        8.5  MAGIC mode . . . . . . . . . . . . . . . . . . . . .  32
        8.6  OVER mode  . . . . . . . . . . . . . . . . . . . . .  34
        8.7  WRAP mode  . . . . . . . . . . . . . . . . . . . . .  34
        8.8  VIEW mode  . . . . . . . . . . . . . . . . . . . . .  34

     Chapter 9  Files                                              36

     Chapter 10  Screen Formatting                                 39
        10.1  Wrapping Text . . . . . . . . . . . . . . . . . . .  39
        10.2  Reformatting Paragraphs . . . . . . . . . . . . . .  39
        10.3  Changing Case . . . . . . . . . . . . . . . . . . .  39
        10.4  Tabs  . . . . . . . . . . . . . . . . . . . . . . .  40

     Chapter 11  Access to the Outside World                       43

     Chapter 12  Keyboard Macros                                   46

     Chapter 13  MicroEMACS Procedures                             48
        13.1  Constants . . . . . . . . . . . . . . . . . . . . .  48
        13.2  Variables . . . . . . . . . . . . . . . . . . . . .  49
           13.2.1  Environmental Variables  . . . . . . . . . . .  50
           13.2.2  User variables . . . . . . . . . . . . . . . .  54
           13.2.3  Buffer Variables . . . . . . . . . . . . . . .  55
           13.2.4  Interactive variables  . . . . . . . . . . . .  55
        13.3  Functions . . . . . . . . . . . . . . . . . . . . .  56
        13.4  Directives  . . . . . . . . . . . . . . . . . . . .  58
           13.4.1  !ENDM Directive  . . . . . . . . . . . . . . .  59
           13.4.2  !FORCE Directive . . . . . . . . . . . . . . .  59
           13.4.3  !IF, !ELSE, and !ENDIF Directives  . . . . . .  60
           13.4.4  !GOTO Directive  . . . . . . . . . . . . . . .  60
           13.4.5  !WHILE and !ENDWHILE Directives  . . . . . . .  61
           13.4.6  !BREAK Directive . . . . . . . . . . . . . . .  61
           13.4.7  !RETURN Directive  . . . . . . . . . . . . . .  62

     Chapter 14  Debugging MicroEMACS Procedures                   63

     Chapter 15  Key Bindings, What they are and why               65

     Appendix A  MicroEMACS Command Line Switches and Startup
                 Files                                             67

     Appendix B  Command Completion                                69

     Appendix C  MicroEMACS Commands                               70

     Appendix D  MicroEMACS Bindings                               77

     Appendix E  Numeric Arguments                                 79



                                    ii









     Appendix F  Numeric Arguments to Commands                     80
        F.1  Commands unaffected by numeric arguments.  . . . . .  84

     Appendix G  Supported machines                                85

     Appendix H  Function Keys                                     87

     Appendix I  Machine Dependent Notes                           88
        I.1  IBM-PC/XT/AT and its clones  . . . . . . . . . . . .  88
        I.2  HP 150 . . . . . . . . . . . . . . . . . . . . . . .  90
        I.3  Atari 520/1040ST . . . . . . . . . . . . . . . . . .  91
        I.4  Amiga 1000 . . . . . . . . . . . . . . . . . . . . .  93
        I.5  UNIX V5, V7, and BSD4.[23] . . . . . . . . . . . . .  94
        I.6  DEC VMS operating system . . . . . . . . . . . . . .  95

     Appendix J  Mode Flags                                       101

     Index                                                        103






































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