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Text File | 1991-01-10 | 38.3 KB | 1,145 lines |
- ;; Terminal emulator for GNU Emacs.
- ;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
- ;; Written by Richard Mlynarik, November 1986.
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 1, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;;>>TODO
- ;;>> terminfo?
- ;;>> ** Nothing can be done about emacs' meta-lossage **
- ;;>> (without redoing keymaps `sanely' -- ask Mly for details)
-
- ;;>> One probably wants to do setenv MORE -c when running with
- ;;>> more-processing enabled.
-
- (provide 'terminal)
- (require 'ehelp)
-
- (defvar terminal-escape-char ?\C-^
- "*All characters except for this are passed verbatim through the
- terminal-emulator. This character acts as a prefix for commands
- to the emulator program itself. Type this character twice to send
- it through the emulator. Type ? after typing it for a list of
- possible commands.
- This variable is local to each terminal-emulator buffer.")
-
- (defvar terminal-scrolling t
- "*If non-nil, the terminal-emulator will `scroll' when output occurs
- past the bottom of the screen. If nil, output will `wrap' to the top
- of the screen.
- This variable is local to each terminal-emulator buffer.")
-
- (defvar terminal-more-processing t
- "*If non-nil, do more-processing.
- This variable is local to each terminal-emulator buffer.")
-
- ;; If you are the sort of loser who uses scrolling without more breaks
- ;; and expects to actually see anything, you should probably set this to
- ;; around 400
- (defvar terminal-redisplay-interval 5000
- "*Maximum number of characters which will be processed by the
- terminal-emulator before a screen redisplay is forced.
- Set this to a large value for greater throughput,
- set it smaller for more frequent updates but overall slower
- performance.")
-
- (defvar terminal-more-break-insertion
- "*** More break -- Press space to continue ***")
-
- (defvar terminal-escape-map nil)
- (defvar terminal-map nil)
- (defvar terminal-more-break-map nil)
- (if terminal-map
- nil
- (let ((map (make-keymap)))
- (fillarray map 'te-pass-through)
- ;(define-key map "\C-l"
- ; '(lambda () (interactive) (te-pass-through) (redraw-display)))
- (setq terminal-map map)))
-
- ;(setq terminal-escape-map nil)
- (if terminal-escape-map
- nil
- (let ((map (make-keymap)))
- ;(fillarray map 'te-escape-extended-command-unread)
- (fillarray map 'undefined)
- (let ((s "0"))
- (while (<= (aref s 0) ?9)
- (define-key map s 'digit-argument)
- (aset s 0 (1+ (aref s 0)))))
- (define-key map "b" 'switch-to-buffer)
- (define-key map "o" 'other-window)
- (define-key map "e" 'te-set-escape-char)
- (define-key map "\C-l" 'redraw-display)
- (define-key map "\C-o" 'te-flush-pending-output)
- (define-key map "m" 'te-toggle-more-processing)
- (define-key map "x" 'te-escape-extended-command)
- (define-key map "?" 'te-escape-help)
- (define-key map (char-to-string help-char) 'te-escape-help)
- (setq terminal-escape-map map)))
-
- (defvar te-escape-command-alist ())
- ;(setq te-escape-command-alist ())
- (if te-escape-command-alist
- nil
- (setq te-escape-command-alist
- '(("Set Escape Character" . te-set-escape-char)
- ("Refresh" . redraw-display)
- ("Record Output" . te-set-output-log)
- ("Photo" . te-set-output-log)
- ("Tofu" . te-tofu) ;; confuse the uninitiated
- ("Stuff Input" . te-stuff-string)
- ("Flush Pending Output" . te-flush-pending-output)
- ("Enable More Processing" . te-enable-more-processing)
- ("Disable More Processing" . te-disable-more-processing)
- ("Scroll at end of page" . te-do-scrolling)
- ("Wrap at end of page" . te-do-wrapping)
- ("Switch To Buffer" . switch-to-buffer)
- ("Other Window" . other-window)
- ("Kill Buffer" . kill-buffer)
- ("Help" . te-escape-help)
- ("Set Redisplay Interval" . te-set-redisplay-interval)
- )))
-
- ;(setq terminal-more-break-map nil)
- (if terminal-more-break-map
- nil
- (let ((map (make-keymap)))
- (fillarray map 'te-more-break-unread)
- (define-key map (char-to-string help-char) 'te-more-break-help)
- (define-key map " " 'te-more-break-resume)
- (define-key map "\C-l" 'redraw-display)
- (define-key map "\C-o" 'te-more-break-flush-pending-output)
- ;;>>> this isn't right
- ;(define-key map "\^?" 'te-more-break-flush-pending-output) ;DEL
- (define-key map "\r" 'te-more-break-advance-one-line)
-
- (setq terminal-more-break-map map)))
-
-
- ;;;; escape map
-
- (defun te-escape ()
- (interactive)
- (let (s
- (local (current-local-map))
- (global (current-global-map)))
- (unwind-protect
- (progn
- (use-global-map terminal-escape-map)
- (use-local-map terminal-escape-map)
- (setq s (read-key-sequence
- (if prefix-arg
- (format "Emacs Terminal escape> %d "
- (prefix-numeric-value prefix-arg))
- "Emacs Terminal escape> "))))
- (use-global-map global)
- (use-local-map local))
- (message "")
- (cond ((string= s (make-string 1 terminal-escape-char))
- (setq last-command-char terminal-escape-char)
- (let ((terminal-escape-char -259))
- (te-pass-through)))
- ((setq s (lookup-key terminal-escape-map s))
- (call-interactively s)))))
-
- (defun te-escape-help ()
- "Provide help on commands available after terminal-escape-char is typed."
- (interactive)
- (message "Terminal emulator escape help...")
- (let ((char (single-key-description terminal-escape-char)))
- (with-electric-help
- (function (lambda ()
- (princ (format "Terminal-emulator escape, invoked by \"%s\"
- Type \"%s\" twice to send a single \"%s\" through.
-
- Other chars following \"%s\" are interpreted as follows:\n"
- char char char char))
-
- (princ (substitute-command-keys "\\{terminal-escape-map}\n"))
- (princ (format "\nSubcommands of \"%s\" (%s)\n"
- (where-is-internal 'te-escape-extended-command
- terminal-escape-map t)
- 'te-escape-extended-command))
- (let ((l (if (fboundp 'sortcar)
- (sortcar (copy-sequence te-escape-command-alist)
- 'string<)
- (sort (copy-sequence te-escape-command-alist)
- (function (lambda (a b)
- (string< (car a) (car b))))))))
- (while l
- (let ((doc (or (documentation (cdr (car l)))
- "Not documented")))
- (if (string-match "\n" doc)
- ;; just use first line of documentation
- (setq doc (substring doc 0 (match-beginning 0))))
- (princ " \"")
- (princ (car (car l)))
- (princ "\":\n ")
- (princ doc)
- (write-char ?\n))
- (setq l (cdr l))))
- nil)))))
-
-
-
- (defun te-escape-extended-command ()
- (interactive)
- (let ((c (let ((completion-ignore-case t))
- (completing-read "terminal command: "
- te-escape-command-alist
- nil t))))
- (if c
- (catch 'foo
- (setq c (downcase c))
- (let ((l te-escape-command-alist))
- (while l
- (if (string= c (downcase (car (car l))))
- (throw 'foo (call-interactively (cdr (car l))))
- (setq l (cdr l)))))))))
-
- ;; not used.
- (defun te-escape-extended-command-unread ()
- (interactive)
- (setq unread-command-char last-input-char)
- (te-escape-extended-command))
-
- (defun te-set-escape-char (c)
- "Change the terminal-emulator escape character."
- (interactive "cSet escape character to: ")
- (let ((o terminal-escape-char))
- (message (if (= o c)
- "\"%s\" is escape char"
- "\"%s\" is now escape; \"%s\" passes though")
- (single-key-description c)
- (single-key-description o))
- (setq terminal-escape-char c)))
-
-
- (defun te-stuff-string (string)
- "Read a string to send to through the terminal emulator
- as though that string had been typed on the keyboard.
-
- Very poor man's file transfer protocol."
- (interactive "sStuff string: ")
- (process-send-string te-process string))
-
- (defun te-set-output-log (name)
- "Record output from the terminal emulator in a buffer."
- (interactive (list (if te-log-buffer
- nil
- (read-buffer "Record output in buffer: "
- (format "%s output-log"
- (buffer-name (current-buffer)))
- nil))))
- (if (or (null name) (equal name ""))
- (progn (setq te-log-buffer nil)
- (message "Output logging off."))
- (if (get-buffer name)
- nil
- (save-excursion
- (set-buffer (get-buffer-create name))
- (fundamental-mode)
- (buffer-flush-undo (current-buffer))
- (erase-buffer)))
- (setq te-log-buffer (get-buffer name))
- (message "Recording terminal emulator output into buffer \"%s\""
- (buffer-name te-log-buffer))))
-
- (defun te-tofu ()
- "Discontinue output log."
- (interactive)
- (te-set-output-log nil))
-
-
- (defun te-toggle (sym arg)
- (set sym (cond ((not (numberp arg)) arg)
- ((= arg 1) (not (symbol-value sym)))
- ((< arg 0) nil)
- (t t))))
-
- (defun te-toggle-more-processing (arg)
- (interactive "p")
- (message (if (te-toggle 'terminal-more-processing arg)
- "More processing on" "More processing off"))
- (if terminal-more-processing (setq te-more-count -1)))
-
- (defun te-toggle-scrolling (arg)
- (interactive "p")
- (message (if (te-toggle 'terminal-scrolling arg)
- "Scroll at end of page" "Wrap at end of page")))
-
- (defun te-enable-more-processing ()
- "Enable ** MORE ** processing"
- (interactive)
- (te-toggle-more-processing t))
-
- (defun te-disable-more-processing ()
- "Disable ** MORE ** processing"
- (interactive)
- (te-toggle-more-processing nil))
-
- (defun te-do-scrolling ()
- "Scroll at end of page (yuck)"
- (interactive)
- (te-toggle-scrolling t))
-
- (defun te-do-wrapping ()
- "Wrap to top of window at end of page"
- (interactive)
- (te-toggle-scrolling nil))
-
-
- (defun te-set-redisplay-interval (arg)
- "Set the maximum interval (in output characters) between screen updates.
- Set this number to large value for greater throughput,
- set it smaller for more frequent updates (but overall slower performance."
- (interactive "NMax number of output chars between redisplay updates: ")
- (setq arg (max arg 1))
- (setq terminal-redisplay-interval arg
- te-redisplay-count 0))
-
- ;;;; more map
-
- ;; every command -must- call te-more-break-unwind
- ;; or grave lossage will result
-
- (put 'te-more-break-unread 'suppress-keymap t)
- (defun te-more-break-unread ()
- (interactive)
- (if (= last-input-char terminal-escape-char)
- (call-interactively 'te-escape)
- (message "Continuing from more break (\"%s\" typed, %d chars output pending...)"
- (single-key-description last-input-char)
- (te-pending-output-length))
- (setq te-more-count 259259)
- (te-more-break-unwind)
- (let ((terminal-more-processing nil))
- (te-pass-through))))
-
- (defun te-more-break-resume ()
- "Proceed past the **MORE** break,
- allowing the next page of output to appear"
- (interactive)
- (message "Continuing from more break")
- (te-more-break-unwind))
-
- (defun te-more-break-help ()
- "Provide help on commands available in a terminal-emulator **MORE** break"
- (interactive)
- (message "Terminal-emulator more break help...")
- (sit-for 0)
- (with-electric-help
- (function (lambda ()
- (princ "Terminal-emulator more break.\n\n")
- (princ (format "Type \"%s\" (te-more-break-resume)\n%s\n"
- (where-is-internal 'te-more-break-resume
- terminal-more-break-map t)
- (documentation 'te-more-break-resume)))
- (princ (substitute-command-keys "\\{terminal-more-break-map}\n"))
- (princ "Any other key is passed through to the program
- running under the terminal emulator and disables more processing until
- all pending output has been dealt with.")
- nil))))
-
-
- (defun te-more-break-advance-one-line ()
- "Allow one more line of text to be output before doing another more break."
- (interactive)
- (setq te-more-count 1)
- (te-more-break-unwind))
-
- (defun te-more-break-flush-pending-output ()
- "Discard any output which has been received by the terminal emulator but
- not yet proceesed and then proceed from the more break."
- (interactive)
- (te-more-break-unwind)
- (te-flush-pending-output))
-
- (defun te-flush-pending-output ()
- "Discard any as-yet-unprocessed output which has been received by
- the terminal emulator."
- (interactive)
- ;; this could conceivably be confusing in the presence of
- ;; escape-sequences spanning process-output chunks
- (if (null (cdr te-pending-output))
- (message "(There is no output pending)")
- (let ((length (te-pending-output-length)))
- (message "Flushing %d chars of pending output" length)
- (setq te-pending-output
- (list 0 (format "\n*** %d chars of pending output flushed ***\n"
- length)))
- (te-update-pending-output-display)
- (te-process-output nil)
- (sit-for 0))))
-
-
- (defun te-pass-through ()
- "Send the last character typed through the terminal-emulator
- without any interpretation"
- (interactive)
- (if (eql last-input-char terminal-escape-char)
- (call-interactively 'te-escape)
- (and terminal-more-processing
- (null (cdr te-pending-output))
- (te-set-more-count nil))
- (send-string te-process (make-string 1 last-input-char))
- (te-process-output t)))
-
- (defun te-set-window-start ()
- (let* ((w (get-buffer-window (current-buffer)))
- (h (if w (window-height w))))
- (cond ((not w)) ; buffer not displayed
- ((>= h (/ (- (point) (point-min)) (1+ te-width)))
- ;; this is the normal case
- (set-window-start w (point-min)))
- ;; this happens if some vandal shrinks our window.
- ((>= h (/ (- (point-max) (point)) (1+ te-width)))
- (set-window-start w (- (point-max) (* h (1+ te-width)) -1)))
- ;; I give up.
- (t nil))))
-
- (defun te-pending-output-length ()
- (let ((length (car te-pending-output))
- (tem (cdr te-pending-output)))
- (while tem
- (setq length (+ length (length (car tem))) tem (cdr tem)))
- length))
-
- ;;;; more break hair
-
- (defun te-more-break ()
- (te-set-more-count t)
- (make-local-variable 'te-more-old-point)
- (setq te-more-old-point (point))
- (make-local-variable 'te-more-old-local-map)
- (setq te-more-old-local-map (current-local-map))
- (use-local-map terminal-more-break-map)
- (make-local-variable 'te-more-old-filter)
- (setq te-more-old-filter (process-filter te-process))
- (make-local-variable 'te-more-old-mode-line-format)
- (setq te-more-old-mode-line-format mode-line-format
- mode-line-format (list "-- **MORE** "
- mode-line-buffer-identification
- "%-"))
- (set-process-filter te-process
- (function (lambda (process string)
- (save-excursion
- (set-buffer (process-buffer process))
- (setq te-pending-output (nconc te-pending-output
- (list string))))
- (te-update-pending-output-display))))
- (te-update-pending-output-display)
- (if (eq (window-buffer (selected-window)) (current-buffer))
- (message "More break "))
- (or (eobp)
- (null terminal-more-break-insertion)
- (save-excursion
- (forward-char 1)
- (delete-region (point) (+ (point) te-width))
- (insert terminal-more-break-insertion)))
- (run-hooks 'terminal-more-break-hook)
- (sit-for 0) ;get display to update
- (throw 'te-process-output t))
-
- (defun te-more-break-unwind ()
- (use-local-map te-more-old-local-map)
- (set-process-filter te-process te-more-old-filter)
- (goto-char te-more-old-point)
- (setq mode-line-format te-more-old-mode-line-format)
- (set-buffer-modified-p (buffer-modified-p))
- (let ((buffer-read-only nil))
- (cond ((eobp))
- (terminal-more-break-insertion
- (forward-char 1)
- (delete-region (point)
- (+ (point) (length terminal-more-break-insertion)))
- (insert-char ?\ te-width)
- (goto-char te-more-old-point)))
- (setq te-more-old-point nil)
- (let ((te-more-count 259259))
- (te-newline)))
- ;(sit-for 0)
- (te-process-output t))
-
- (defun te-set-more-count (newline)
- (let ((line (/ (- (point) (point-min)) (1+ te-width))))
- (if newline (setq line (1+ line)))
- (cond ((= line te-height)
- (setq te-more-count te-height))
- ;>>>> something is strange. Investigate this!
- ((= line (1- te-height))
- (setq te-more-count te-height))
- ((or (< line (/ te-height 2))
- (> (- te-height line) 10))
- ;; break at end of this page
- (setq te-more-count (- te-height line)))
- (t
- ;; migrate back towards top (ie bottom) of screen.
- (setq te-more-count (- te-height
- (if (> te-height 10) 2 1)))))))
-
-
- ;;;; More or less straight-forward terminal escapes
-
- ;; ^j, meaning `newline' to non-display programs.
- ;; (Who would think of ever writing a system which doesn't understand
- ;; display terminals natively? Un*x: The Operating System of the Future.)
- (defun te-newline ()
- "Move down a line, optionally do more processing, perhaps wrap/scroll,
- move to start of new line, clear to end of line."
- (end-of-line)
- (cond ((not terminal-more-processing))
- ((< (setq te-more-count (1- te-more-count)) 0)
- (te-set-more-count t))
- ((eql te-more-count 0)
- ;; this doesn't return
- (te-more-break)))
- (if (eobp)
- (progn
- (delete-region (point-min) (+ (point-min) te-width))
- (goto-char (point-min))
- (if terminal-scrolling
- (progn (delete-char 1)
- (goto-char (point-max))
- (insert ?\n))))
- (forward-char 1)
- (delete-region (point) (+ (point) te-width)))
- (insert-char ?\ te-width)
- (beginning-of-line)
- (te-set-window-start))
-
- ;; ^p ^j
- ;; Handle the `do' or `nl' termcap capability.
- ;;>> I am not sure why this broken, obsolete, capability is here.
- ;;>> Perhaps it is for VIle. No comment was made about why it
- ;;>> was added (in "Sun Dec 6 01:22:27 1987 Richard Stallman")
- (defun te-down-vertically-or-scroll ()
- "Move down a line vertically, or scroll at bottom."
- (let ((column (current-column)))
- (end-of-line)
- (if (eobp)
- (progn
- (delete-region (point-min) (+ (point-min) te-width))
- (goto-char (point-min))
- (delete-char 1)
- (goto-char (point-max))
- (insert ?\n)
- (insert-char ?\ te-width)
- (beginning-of-line))
- (forward-line 1))
- (move-to-column column))
- (te-set-window-start))
-
- ; ^p = x+32 y+32
- (defun te-move-to-position ()
- ;; must offset by #o40 since cretinous unix won't send a 004 char through
- (let ((y (- (te-get-char) 32))
- (x (- (te-get-char) 32)))
- (if (or (> x te-width)
- (> y te-height))
- () ;(error "fucked %d %d" x y)
- (goto-char (+ (point-min) x (* y (1+ te-width))))
- ;(te-set-window-start?)
- ))
- (setq te-more-count -1))
-
-
-
- ;; ^p c
- (defun te-clear-rest-of-line ()
- (save-excursion
- (let ((n (- (point) (progn (end-of-line) (point)))))
- (delete-region (point) (+ (point) n))
- (insert-char ?\ (- n)))))
-
-
- ;; ^p C
- (defun te-clear-rest-of-screen ()
- (save-excursion
- (te-clear-rest-of-line)
- (while (progn (end-of-line) (not (eobp)))
- (forward-char 1) (end-of-line)
- (delete-region (- (point) te-width) (point))
- (insert-char ?\ te-width))))
-
-
- ;; ^p ^l
- (defun te-clear-screen ()
- ;; regenerate buffer to compensate for (nonexistent!!) bugs.
- (erase-buffer)
- (let ((i 0))
- (while (< i te-height)
- (setq i (1+ i))
- (insert-char ?\ te-width)
- (insert ?\n)))
- (delete-region (1- (point-max)) (point-max))
- (goto-char (point-min))
- (setq te-more-count -1))
-
-
- ;; ^p ^o count+32
- (defun te-insert-lines ()
- (if (not (bolp))
- ();(error "fooI")
- (save-excursion
- (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
- (n (min (- (te-get-char) ?\ ) line))
- (i 0))
- (delete-region (- (point-max) (* n (1+ te-width))) (point-max))
- (if (eql (point) (point-max)) (insert ?\n))
- (while (< i n)
- (setq i (1+ i))
- (insert-char ?\ te-width)
- (or (eql i line) (insert ?\n))))))
- (setq te-more-count -1))
-
-
- ;; ^p ^k count+32
- (defun te-delete-lines ()
- (if (not (bolp))
- ();(error "fooD")
- (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
- (n (min (- (te-get-char) ?\ ) line))
- (i 0))
- (delete-region (point)
- (min (+ (point) (* n (1+ te-width))) (point-max)))
- (save-excursion
- (goto-char (point-max))
- (while (< i n)
- (setq i (1+ i))
- (insert-char ?\ te-width)
- (or (eql i line) (insert ?\n))))))
- (setq te-more-count -1))
-
- ;; ^p ^a
- (defun te-beginning-of-line ()
- (beginning-of-line))
-
- ;; ^p ^b
- (defun te-backward-char ()
- (if (not (bolp))
- (backward-char 1)))
-
- ;; ^p ^f
- (defun te-forward-char ()
- (if (not (eolp))
- (forward-char 1)))
-
-
- ;; 0177
- (defun te-delete ()
- (if (bolp)
- ()
- (delete-region (1- (point)) (point))
- (insert ?\ )
- (forward-char -1)))
-
- ;; ^p ^g
- (defun te-beep ()
- (beep))
-
-
- ;; ^p _ count+32
- (defun te-insert-spaces ()
- (let* ((p (point))
- (n (min (- (te-get-char) 32)
- (- (progn (end-of-line) (point)) p))))
- (if (<= n 0)
- nil
- (delete-char (- n))
- (goto-char p)
- (insert-char ?\ n))
- (goto-char p)))
-
- ;; ^p d count+32 (should be ^p ^d but cretinous un*x won't send ^d chars!!!)
- (defun te-delete-char ()
- (let* ((p (point))
- (n (min (- (te-get-char) 32)
- (- (progn (end-of-line) (point)) p))))
- (if (<= n 0)
- nil
- (insert-char ?\ n)
- (goto-char p)
- (delete-char n))
- (goto-char p)))
-
-
-
- ;; disgusting unix-required shit
- ;; Are we living twenty years in the past yet?
-
- (defun te-losing-unix ()
- ;(what lossage)
- ;(message "fucking-unix: %d" char)
- )
-
- ;; ^i
- (defun te-output-tab ()
- (let* ((p (point))
- (x (- p (progn (beginning-of-line) (point))))
- (l (min (- 8 (logand x 7))
- (progn (end-of-line) (- (point) p)))))
- (goto-char (+ p l))))
-
- ;; Also:
- ;; ^m => beginning-of-line (for which it -should- be using ^p ^a, right?!!)
- ;; ^g => te-beep (for which it should use ^p ^g)
- ;; ^h => te-backward-char (for which it should use ^p ^b)
-
-
-
- (defun te-filter (process string)
- (let* ((obuf (current-buffer))
- (m meta-flag))
- ;; can't use save-excursion, as that preserves point, which we don't want
- (unwind-protect
- (progn
- (set-buffer (process-buffer process))
- (goto-char te-saved-point)
- (and (bufferp te-log-buffer)
- (if (null (buffer-name te-log-buffer))
- ;; killed
- (setq te-log-buffer nil)
- (set-buffer te-log-buffer)
- (goto-char (point-max))
- (insert string)
- (set-buffer (process-buffer process))))
- (setq te-pending-output (nconc te-pending-output (list string)))
- (te-update-pending-output-display)
- ;; this binding is needed because emacs looks at meta-flag when
- ;; the keystroke is read from the keyboard, not when it is about
- ;; to be fed into a keymap (or returned by read-char)
- ;; There still could be some screws, though.
- (let ((meta-flag m))
- (te-process-output (eq (current-buffer)
- (window-buffer (selected-window)))))
- (set-buffer (process-buffer process))
- (setq te-saved-point (point)))
- (set-buffer obuf))))
-
- ;; fucking unix has -such- braindamaged lack of tty control...
- (defun te-process-output (preemptable)
- ;;>> There seems no good reason to ever disallow preemption
- (setq preemptable t)
- (catch 'te-process-output
- (let ((buffer-read-only nil)
- (string nil) ostring start char (matchpos nil))
- (while (cdr te-pending-output)
- (setq ostring string
- start (car te-pending-output)
- string (car (cdr te-pending-output))
- char (aref string start))
- (if (eql (setq start (1+ start)) (length string))
- (progn (setq te-pending-output
- (cons 0 (cdr (cdr te-pending-output)))
- start 0
- string (car (cdr te-pending-output)))
- (te-update-pending-output-display))
- (setcar te-pending-output start))
- (if (and (> char ?\037) (< char ?\377))
- (cond ((eolp)
- ;; unread char
- (if (eql start 0)
- (setq te-pending-output
- (cons 0 (cons (make-string 1 char)
- (cdr te-pending-output))))
- (setcar te-pending-output (1- start)))
- (te-newline))
- ((null string)
- (delete-char 1) (insert char)
- (te-redisplay-if-necessary 1))
- (t
- (let ((end (or (and (eq ostring string) matchpos)
- (setq matchpos (string-match
- "[\000-\037\177-\377]"
- string start))
- (length string))))
- (delete-char 1) (insert char)
- (setq char (point)) (end-of-line)
- (setq end (min end (+ start (- (point) char))))
- (goto-char char)
- (if (eql end matchpos) (setq matchpos nil))
- (delete-region (point) (+ (point) (- end start)))
- (insert (if (and (eql start 0)
- (eql end (length string)))
- string
- (substring string start end)))
- (if (eql end (length string))
- (setq te-pending-output
- (cons 0 (cdr (cdr te-pending-output))))
- (setcar te-pending-output end))
- (te-redisplay-if-necessary (1+ (- end start))))))
- ;; I suppose if I split the guts of this out into a separate
- ;; function we could trivially emulate different terminals
- ;; Who cares in any case? (Apart from stupid losers using rlogin)
- (funcall
- (if (eql char ?\^p)
- (or (cdr (assq (te-get-char)
- '((?= . te-move-to-position)
- (?c . te-clear-rest-of-line)
- (?C . te-clear-rest-of-screen)
- (?\C-o . te-insert-lines)
- (?\C-k . te-delete-lines)
- ;; not necessary, but help sometimes.
- (?\C-a . te-beginning-of-line)
- (?\C-b . te-backward-char)
- ;; should be C-d, but un*x
- ;; pty's won't send \004 through!
- ;; Can you believe this?
- (?d . te-delete-char)
- (?_ . te-insert-spaces)
- ;; random
- (?\C-f . te-forward-char)
- (?\C-g . te-beep)
- (?\C-j . te-down-vertically-or-scroll)
- (?\C-l . te-clear-screen)
- )))
- 'te-losing-unix)
- (or (cdr (assq char
- '((?\C-j . te-newline)
- (?\177 . te-delete)
- ;; Did I ask to be sent these characters?
- ;; I don't remember doing so, either.
- ;; (Perhaps some operating system or
- ;; other is completely incompetent...)
- (?\C-m . te-beginning-of-line) ;fuck me harder
- (?\C-g . te-beep) ;again and again!
- (?\C-h . te-backward-char) ;wa12id!!
- (?\C-i . te-output-tab)))) ;(spiked)
- 'te-losing-unix))) ;That feels better
- (te-redisplay-if-necessary 1))
- (and preemptable
- (input-pending-p)
- ;; preemptable output! Oh my!!
- (throw 'te-process-output t)))))
- ;; We must update window-point in every window displaying our buffer
- (let* ((s (selected-window))
- (w s))
- (while (not (eq s (setq w (next-window w))))
- (if (eq (window-buffer w) (current-buffer))
- (set-window-point w (point))))))
-
- (defun te-get-char ()
- (if (cdr te-pending-output)
- (let ((start (car te-pending-output))
- (string (car (cdr te-pending-output))))
- (prog1 (aref string start)
- (if (eql (setq start (1+ start)) (length string))
- (setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
- (setcar te-pending-output start))))
- (catch 'char
- (let ((filter (process-filter te-process)))
- (unwind-protect
- (progn
- (set-process-filter te-process
- (function (lambda (p s)
- (or (eql (length s) 1)
- (setq te-pending-output (list 1 s)))
- (throw 'char (aref s 0)))))
- (accept-process-output te-process))
- (set-process-filter te-process filter))))))
-
-
- (defun te-redisplay-if-necessary (length)
- (and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
- (eq (current-buffer) (window-buffer (selected-window)))
- (waiting-for-user-input-p)
- (progn (te-update-pending-output-display)
- (sit-for 0)
- (setq te-redisplay-count terminal-redisplay-interval))))
-
- (defun te-update-pending-output-display ()
- (if (null (cdr te-pending-output))
- (setq te-pending-output-info "")
- (let ((length (te-pending-output-length)))
- (if (< length 1500)
- (setq te-pending-output-info "")
- (setq te-pending-output-info (format "(%dK chars output pending) "
- (/ (+ length 512) 1024))))))
- ;; update mode line
- (set-buffer-modified-p (buffer-modified-p)))
-
-
- (defun te-sentinel (process message)
- (cond ((eq (process-status process) 'run))
- ((null (buffer-name (process-buffer process)))) ;deleted
- (t (let ((b (current-buffer)))
- (save-excursion
- (set-buffer (process-buffer process))
- (setq buffer-read-only nil)
- (fundamental-mode)
- (goto-char (point-max))
- (delete-blank-lines)
- (delete-horizontal-space)
- (insert "\n*******\n" message "*******\n"))
- (if (and (eq b (process-buffer process))
- (waiting-for-user-input-p))
- (progn (goto-char (point-max))
- (recenter -1)))))))
-
- (defvar te-stty-string "stty -nl new dec echo"
- "Command string (to be interpreted by \"sh\") which sets the modes
- of the virtual terminal to be appropriate for interactive use.")
-
- (defvar explicit-shell-file-name nil
- "*If non-nil, is file name to use for explicitly requested inferior shell.")
-
- (defun terminal-emulator (buffer program args &optional width height)
- "Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
- ARGS is a list of argument-strings. Remaining arguments are WIDTH and HEIGHT.
- BUFFER's contents are made an image of the display generated by that program,
- and any input typed when BUFFER is the current Emacs buffer is sent to that
- program an keyboard input.
-
- Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
- are parsed from an input-string using your usual shell.
- WIDTH and HEIGHT are determined from the size of the current window
- -- WIDTH will be one less than the window's width, HEIGHT will be its height.
-
- To switch buffers and leave the emulator, or to give commands
- to the emulator itself (as opposed to the program running under it),
- type Control-^. The following character is an emulator command.
- Type Control-^ twice to send it to the subprogram.
- This escape character may be changed using the variable `terminal-escape-char'.
-
- `Meta' characters may not currently be sent through the terminal emulator.
-
- Here is a list of some of the variables which control the behaviour
- of the emulator -- see their documentation for more information:
- terminal-escape-char, terminal-scrolling, terminal-more-processing,
- terminal-redisplay-interval.
-
- This function calls the value of terminal-mode-hook if that exists
- and is non-nil after the terminal buffer has been set up and the
- subprocess started.
-
- Presently with `termcap' only; if somebody sends us code to make this
- work with `terminfo' we will try to use it."
- (interactive
- (cons (save-excursion
- (set-buffer (get-buffer-create "*terminal*"))
- (buffer-name (if (or (not (boundp 'te-process))
- (null te-process)
- (not (eq (process-status te-process)
- 'run)))
- (current-buffer)
- (generate-new-buffer "*terminal*"))))
- (append
- (let* ((default-s
- ;; Default shell is same thing M-x shell uses.
- (or explicit-shell-file-name
- (getenv "ESHELL")
- (getenv "SHELL")
- "/bin/sh"))
- (s (read-string
- (format "Run program in emulator: (default %s) "
- default-s))))
- (if (equal s "")
- (list default-s '())
- (te-parse-program-and-args s))))))
- (switch-to-buffer buffer)
- (if (null width) (setq width (- (window-width (selected-window)) 1)))
- (if (null height) (setq height (- (window-height (selected-window)) 1)))
- (terminal-mode)
- (setq te-width width te-height height)
- (setq mode-line-buffer-identification
- (list (format "Emacs terminal %dx%d: %%b " te-width te-height)
- 'te-pending-output-info))
- (let ((buffer-read-only nil))
- (te-clear-screen))
- (let (process)
- (while (setq process (get-buffer-process (current-buffer)))
- (if (y-or-n-p (format "Kill process %s? " (process-name process)))
- (delete-process process)
- (error "Process %s not killed" (process-name process)))))
- (condition-case err
- (let ((termcap
- ;; Because of Unix Brain Death(tm), we can't change
- ;; the terminal type of a running process, and so
- ;; terminal size and scrollability are wired-down
- ;; at this point. ("Detach? What's that?")
- (concat (format "emacs-virtual:co#%d:li#%d:%s"
- ;; Sigh. These can't be dynamically changed.
- te-width te-height (if terminal-scrolling
- "" "ns:"))
- ;;-- Basic things
- ;; cursor-motion, bol, forward/backward char
- "cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
- ;; newline, clear eof/eof, audible bell
- "nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
- ;; insert/delete char/line
- "IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
- ;;-- Not-widely-known (ie nonstandard) flags, which mean
- ;; o writing in the last column of the last line
- ;; doesn't cause idiotic scrolling, and
- ;; o don't use idiotische c-s/c-q sogenannte
- ;; ``flow control'' auf keinen Fall.
- "LP:NF:"
- ;;-- For stupid or obsolete programs
- "ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p= :"
- ;;-- For disgusting programs.
- ;; (VI? What losers need these, I wonder?)
- "im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")))
- (if (fboundp 'start-subprocess)
- ;; this winning function would do everything, except that
- ;; rms doesn't want it.
- (setq te-process (start-subprocess "terminal-emulator"
- program args
- 'channel-type 'terminal
- 'filter 'te-filter
- 'buffer (current-buffer)
- 'sentinel 'te-sentinel
- 'modify-environment
- (list (cons "TERM" "emacs-virtual")
- (cons "TERMCAP" termcap))))
- ;; so instead we resort to this...
- (setq te-process (start-process "terminal-emulator" (current-buffer)
- "/bin/sh" "-c"
- ;; Yuck!!! Start a shell to set some terminal
- ;; control characteristics. Then start the
- ;; "env" program to setup the terminal type
- ;; Then finally start the program we wanted.
- (format "%s; exec %s TERM=emacs-virtual %s %s"
- te-stty-string
- (te-quote-arg-for-sh
- (concat exec-directory "env"))
- (te-quote-arg-for-sh
- (concat "TERMCAP=" termcap))
- (mapconcat 'te-quote-arg-for-sh
- (cons program args) " "))))
- (set-process-filter te-process 'te-filter)
- (set-process-sentinel te-process 'te-sentinel)))
- (error (fundamental-mode)
- (signal (car err) (cdr err))))
- ;; sigh
- (if (default-value 'meta-flag)
- (progn (message
- "Note: Meta key disabled due to maybe-eventually-reparable braindamage")
- (sit-for 1)))
- (message "Entering emacs terminal-emulator... Type %s %s for help"
- (single-key-description terminal-escape-char)
- (mapconcat 'single-key-description
- (where-is-internal 'te-escape-help
- terminal-escape-map
- t)
- " "))
- (setq inhibit-quit t) ;sport death
- (use-local-map terminal-map)
- (run-hooks 'terminal-mode-hook))
-
- (defun te-parse-program-and-args (s)
- (cond ((string-match "\\`\\([a-zA-Z0-9-+=_.@/:]+[ \t]*\\)+\\'" s)
- (let ((l ()) (p 0))
- (while p
- (setq l (cons (if (string-match
- "\\([a-zA-Z0-9-+=_.@/:]+\\)\\([ \t]+\\)*"
- s p)
- (prog1 (substring s p (match-end 1))
- (setq p (match-end 0))
- (if (eql p (length s)) (setq p nil)))
- (prog1 (substring s p)
- (setq p nil)))
- l)))
- (setq l (nreverse l))
- (list (car l) (cdr l))))
- ((and (string-match "[ \t]" s) (not (file-exists-p s)))
- (list shell-file-name (list "-c" (concat "exec " s))))
- (t (list s ()))))
-
- (put 'terminal-mode 'mode-class 'special)
- ;; This is only separated out from function terminal-emulator
- ;; to keep the latter a little more managable.
- (defun terminal-mode ()
- "Set up variables for use f the terminal-emualtor.
- One should not call this -- it is an internal function
- of the terminal-emulator"
- (kill-all-local-variables)
- (buffer-flush-undo (current-buffer))
- (setq major-mode 'terminal-mode)
- (setq mode-name "terminal")
- ; (make-local-variable 'Helper-return-blurb)
- ; (setq Helper-return-blurb "return to terminal simulator")
- (setq mode-line-process '(": %s"))
- (setq buffer-read-only t)
- (setq truncate-lines t)
- (make-local-variable 'terminal-escape-char)
- (setq terminal-escape-char (default-value 'terminal-escape-char))
- (make-local-variable 'terminal-scrolling)
- (setq terminal-scrolling (default-value 'terminal-scrolling))
- (make-local-variable 'terminal-more-processing)
- (setq terminal-more-processing (default-value 'terminal-more-processing))
- (make-local-variable 'terminal-redisplay-interval)
- (setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
- (make-local-variable 'te-width)
- (make-local-variable 'te-height)
- (make-local-variable 'te-process)
- (make-local-variable 'te-pending-output)
- (setq te-pending-output (list 0))
- (make-local-variable 'te-saved-point)
- (setq te-saved-point (point-min))
- (make-local-variable 'te-pending-output-info) ;for the mode line
- (setq te-pending-output-info "")
- (make-local-variable 'inhibit-quit)
- ;(setq inhibit-quit t)
- (make-local-variable 'te-log-buffer)
- (setq te-log-buffer nil)
- (make-local-variable 'te-more-count)
- (setq te-more-count -1)
- (make-local-variable 'te-redisplay-count)
- (setq te-redisplay-count terminal-redisplay-interval)
- ;;>> Nothing can be done about this without decruftifying
- ;;>> emacs keymaps.
- (make-local-variable 'meta-flag) ;sigh
- (setq meta-flag nil)
- ;(use-local-map terminal-mode-map)
- ;; terminal-mode-hook is called above in function terminal-emulator
- )
-
- ;;;; what a complete loss
-
- (defun te-quote-arg-for-sh (fuckme)
- (cond ((string-match "\\`[a-zA-Z0-9-+=_.@/:]+\\'"
- fuckme)
- fuckme)
- ((not (string-match "[$]" fuckme))
- ;; "[\"\\]" are special to sh and the lisp reader in the same way
- (prin1-to-string fuckme))
- (t
- (let ((harder "")
- (cretin 0)
- (stupid 0))
- (while (cond ((>= cretin (length fuckme))
- nil)
- ;; this is the set of chars magic with "..." in `sh'
- ((setq stupid (string-match "[\"\\$]"
- fuckme cretin))
- t)
- (t (setq harder (concat harder
- (substring fuckme cretin)))
- nil))
- (setq harder (concat harder (substring fuckme cretin stupid)
- ;; Can't use ?\\ since `concat'
- ;; unfortunately does prin1-to-string
- ;; on fixna. Amazing.
- "\\"
- (substring fuckme
- stupid
- (1+ stupid)))
- cretin (1+ stupid)))
- (concat "\"" harder "\"")))))
-