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- /*
- * Assorted commands. The file contains the command processors for a large
- * assortment of unrelated commands. The only thing they have in common is
- * that they are all command processors.
- */
- #include "notab.h"
-
- #include "def.h"
- #include "line.h"
- #include "buffer.h"
- #include "window.h"
-
- static int isblank
- PROTO((register struct line *));
-
- #ifdef ANSI
- #include <string.h>
- #endif
-
- /*
- * Display a bunch of useful information about the current location of dot.
- * The character under the cursor (in octal), the current line, row, and
- * column, and approximate position of the cursor in the file (as a
- * percentage) is displayed. The column position assumes an infinite position
- * display; it does not truncate just because the screen does. This is
- * normally bound to "C-X =".
- */
- /* ARGSUSED */
- showcpos(f, n)
- {
- register struct line *clp;
- register long nchar;
- long cchar;
- register int nline, row;
- int cline, cbyte; /* Current line/char/byte */
- int ratio;
-
- clp = lforw(curbp->b_linep); /* Collect the data. */
- nchar = 0;
- cline = nline = 0;
- for (;;) {
- ++nline; /* Count this line */
- if (clp == curwp->w_dotp) {
- cline = nline; /* Mark line */
- cchar = nchar + curwp->w_doto;
- if (curwp->w_doto == llength(clp))
- cbyte = '\n';
- else
- cbyte = lgetc(clp, curwp->w_doto);
- }
- nchar += llength(clp); /* Now count the chars */
- clp = lforw(clp);
- if (clp == curbp->b_linep) {
- if (cline == 0)
- cline = nline + 1;
- break;
- }
- nchar++; /* count the newline */
- }
- row = curwp->w_toprow + 1; /* Determine row. */
- clp = curwp->w_linep;
- while (clp != curbp->b_linep && clp != curwp->w_dotp) {
- ++row;
- clp = lforw(clp);
- }
- /* NOSTRICT */
- ratio = nchar ? (100L * cchar) / nchar : 100;
- ewprintf("Char: %c (0%o) point=%ld(%d%%) line=%d row=%d col=%d",
- cbyte, cbyte, cchar, ratio, cline, row, getcolpos());
- return TRUE;
- }
-
- getcolpos()
- {
- register int col, i, c;
-
- col = 1; /* Determine column. */
- for (i = 0; i < curwp->w_doto; ++i) {
- c = lgetc(curwp->w_dotp, i);
- if (c == '\t'
- #ifdef NOTAB
- && !(curbp->b_flag & BFNOTAB)
- #endif
- ) {
- col |= 0x07;
- ++col;
- } else if (ISCTRL(c) != FALSE)
- ++col;
- ++col;
- }
- return col;
- }
- /*
- * Twiddle the two characters on either side of dot. If dot is at the end of
- * the line twiddle the two characters before it. Return with an error if dot
- * is at the beginning of line; it seems to be a bit pointless to make this
- * work. This fixes up a very common typo with a single stroke. Normally
- * bound to "C-T". This always works within a line, so "WFEDIT" is good
- * enough.
- */
- /* ARGSUSED */
- twiddle(f, n)
- {
- register struct line *dotp;
- register int doto;
- register int cr;
- VOID lchange();
-
- dotp = curwp->w_dotp;
- doto = curwp->w_doto;
- if (doto == llength(dotp)) {
- if (--doto <= 0)
- return FALSE;
- } else {
- if (doto == 0)
- return FALSE;
- ++curwp->w_doto;
- }
- cr = lgetc(dotp, doto--);
- lputc(dotp, doto + 1, lgetc(dotp, doto));
- lputc(dotp, doto, cr);
- lchange(WFEDIT);
- return TRUE;
- }
-
- /*
- * Open up some blank space. The basic plan is to insert a bunch of newlines,
- * and then back up over them. Everything is done by the subcommand
- * procerssors. They even handle the looping. Normally this is bound to
- * "C-O".
- */
- /* ARGSUSED */
- openline(f, n)
- {
- register int i;
- register int s;
-
- if (n < 0)
- return FALSE;
- if (n == 0)
- return TRUE;
- i = n; /* Insert newlines. */
- do {
- s = lnewline();
- } while (s == TRUE && --i);
- if (s == TRUE) /* Then back up overtop */
- s = backchar(f | FFRAND, n); /* of them all. */
- return s;
- }
-
- /*
- * Insert a newline.
- */
- /* ARGSUSED */
- newline(f, n)
- {
- register int s;
-
- if (n < 0)
- return FALSE;
- while (n--)
- if ((s = lnewline()) != TRUE)
- return s;
- return TRUE;
- }
-
- /*
- * Delete blank lines around dot. What this command does depends if dot is
- * sitting on a blank line. If dot is sitting on a blank line, this command
- * deletes all the blank lines above and below the current line. If it is
- * sitting on a non blank line then it deletes all of the blank lines after
- * the line. Normally this command is bound to "C-X C-O". Any argument is
- * ignored.
- *
- * Hacked by phr Thu Dec 22 09:03:19 1988 to leave a blank line if executed in
- * part of a sequence of blank lines (despite previous comment, it used to
- * delete them all).
- */
- /* ARGSUSED */
- deblank(f, n)
- {
- register struct line *lp1;
- register struct line *lp2;
- register RSIZE nld;
- int nonblank, tof;
-
- lp1 = curwp->w_dotp;
- nonblank = !isblank(lp1);
- while (isblank(lp1) && (lp2 = lback(lp1)) != curbp->b_linep)
- lp1 = lp2;
- tof = (lp2 == curbp->b_linep);
- lp2 = lp1;
- nld = (RSIZE) 0;
- while ((lp2 = lforw(lp2)) != curbp->b_linep && isblank(lp2))
- ++nld;
- if (nld == 0)
- return (TRUE);
- if (!nonblank && !tof && nld > 1)
- nld -= 1;
- curwp->w_dotp = lforw(lp1);
- curwp->w_doto = 0;
- return fdelete((RSIZE) nld, FALSE);
- }
- /*
- * isblank - just decide if it's a blank line.
- */
- static int
- isblank(lp)
- register struct line *lp;
- {
- register char *s;
- register int i;
-
- for (s = ltext(lp), i = 0; i < llength(lp); i += 1)
- if (s[i] != ' ' || s[i] != '\t')
- return FALSE;
- return TRUE;
- }
-
- /*
- * Delete any whitespace around dot, then insert a space.
- */
- justone(f, n)
- {
- (VOID) delwhite(f, n);
- return linsert(1, ' ');
- }
- /*
- * Delete any whitespace around dot.
- */
- /* ARGSUSED */
- delwhite(f, n)
- {
- register int col, c, s;
-
- col = curwp->w_doto;
- while (((c = lgetc(curwp->w_dotp, col)) == ' ' || c == '\t')
- && col < llength(curwp->w_dotp))
- ++col;
- do {
- if (curwp->w_doto == 0) {
- s = FALSE;
- break;
- }
- if ((s = backchar(FFRAND, 1)) != TRUE)
- break;
- } while ((c = lgetc(curwp->w_dotp, curwp->w_doto)) == ' ' || c == '\t');
-
- if (s == TRUE)
- (VOID) forwchar(FFRAND, 1);
- (VOID) fdelete((RSIZE) (col - curwp->w_doto), FALSE);
- return TRUE;
- }
- /*
- * Insert a newline, then enough tabs and spaces to duplicate the indentation
- * of the previous line. Assumes tabs are every eight characters. Quite
- * simple. Figure out the indentation of the current line. Insert a newline
- * by calling the standard routine. Insert the indentation by inserting the
- * right number of tabs and spaces. Return TRUE if all ok. Return FALSE if
- * one of the subcomands failed. Normally bound to "C-J".
- */
- /* ARGSUSED */
- indent(f, n)
- {
- register int nicol;
- register int c;
- register int i;
-
- if (n < 0)
- return (FALSE);
- while (n--) {
- nicol = 0;
- for (i = 0; i < llength(curwp->w_dotp); ++i) {
- c = lgetc(curwp->w_dotp, i);
- if (c != ' ' && c != '\t')
- break;
- if (c == '\t')
- nicol |= 0x07;
- ++nicol;
- }
- if (lnewline() == FALSE || ((
- #ifdef NOTAB
- curbp->b_flag & BFNOTAB) ?
- linsert(nicol, ' ') == FALSE : (
- #endif
- ((i = nicol / 8) != 0 && linsert(i, '\t') == FALSE) ||
- ((i = nicol % 8) != 0 && linsert(i, ' ') == FALSE))))
- return FALSE;
- }
- return TRUE;
- }
-
- /*
- * Delete forward. This is real easy, because the basic delete routine does
- * all of the work. Watches for negative arguments, and does the right thing.
- * If any argument is present, it kills rather than deletes, to prevent loss
- * of text if typed with a big argument. Normally bound to "C-D".
- */
- /* ARGSUSED */
- forwdel(f, n)
- {
- if (n < 0)
- return backdel(f | FFRAND, -n);
- if (f & FFARG) { /* Really a kill. */
- if ((lastflag & CFKILL) == 0)
- kdelete();
- thisflag |= CFKILL;
- }
- return fdelete((RSIZE) n, f & FFARG);
- }
-
- /*
- * Delete backwards. This is no harder than the above, because we get to use
- * the same code. Like delete forward, this actually does a kill if presented
- * with an argument.
- */
- /* ARGSUSED */
- backdel(f, n)
- {
-
- if (n < 0)
- return forwdel(f | FFRAND, -n);
- if (f & FFARG) { /* Really a kill. */
- if ((lastflag & CFKILL) == 0)
- kdelete();
- thisflag |= CFKILL;
- }
- return bdelete((RSIZE) n, f & FFARG);
- }
-
- /*
- * Kill line. If called without an argument, it kills from dot to the end of
- * the line, unless it is at the end of the line, when it kills the newline.
- * If called with an argument of 0, it kills from the start of the line to
- * dot. If called with a positive argument, it kills from dot forward over
- * that number of newlines. If called with a negative argument it kills any
- * text before dot on the current line, then it kills back abs(arg) lines.
- */
- /* ARGSUSED */
- killline(f, n)
- {
- register RSIZE chunk;
- register struct line *nextp;
- register int i, c;
-
- if ((lastflag & CFKILL) == 0) /* Clear kill buffer if */
- kdelete(); /* last wasn't a kill. */
- thisflag |= CFKILL;
- if (!(f & FFARG)) {
- for (i = curwp->w_doto; i < llength(curwp->w_dotp); ++i)
- if ((c = lgetc(curwp->w_dotp, i)) != ' ' && c != '\t')
- break;
- if (i == llength(curwp->w_dotp)) {
- chunk = llength(curwp->w_dotp) - curwp->w_doto;
- if (lforw(curwp->w_dotp) != curbp->b_linep || !chunk)
- chunk += 1;
- } else {
- chunk = llength(curwp->w_dotp) - curwp->w_doto;
- if (chunk == 0)
- chunk = 1;
- }
- i = fdelete(chunk, TRUE);
- } else if (n > 0) {
- chunk = llength(curwp->w_dotp) - curwp->w_doto + 1;
- nextp = lforw(curwp->w_dotp);
- i = n;
- while (--i) {
- if (nextp == curbp->b_linep)
- break;
- chunk += llength(nextp) + 1;
- nextp = lforw(nextp);
- }
- i = fdelete(chunk, TRUE);
- } else { /* n <= 0 */
- chunk = curwp->w_doto;
- nextp = lback(curwp->w_dotp);
- i = n;
- while (i++) {
- if (nextp == curbp->b_linep)
- break;
- chunk += llength(nextp) + 1;
- nextp = lback(nextp);
- }
- i = bdelete(chunk, TRUE);
- }
- return i;
- }
-
- /*
- * Yank text back from the kill buffer. This is really easy. All of the work
- * is done by the standard insert routines. All you do is run the loop, and
- * check for errors. The blank lines are inserted with a call to "newline"
- * instead of a call to "lnewline" so that the magic stuff that happens when
- * you type a carriage return also happens when a carriage return is yanked
- * back from the kill buffer. An attempt has been made to fix the cosmetic
- * bug associated with a yank when dot is on the top line of the window
- * (nothing moves, because all of the new text landed off screen).
- */
- /* ARGSUSED */
- yank(f, n)
- {
- register int c;
- register int linsiz;
- char lin[NLINE];
- RSIZE i;
-
- register struct line *lp;
- register int nline;
- VOID isetmark();
-
- if (n < 0)
- return FALSE;
- nline = 0; /* Newline counting. */
- while (n--) {
- isetmark(); /* mark around last yank */
- i = 0;
- while (((c = kremove(i)) >= 0) && (c != '\n'))
- if (linsert(1, c) == FALSE)
- return (FALSE);
- else
- i++;
- if (kremove(i++) == '\n') {
- while ((linsiz = klremove(lin, &i)) >= 0) {
- if (newline(FFRAND, 1) == FALSE)
- return (FALSE);
- if (linsert(linsiz, 0) == FALSE)
- return (FALSE);
- lp = curwp->w_dotp;
- bcopy(lin, &lp->l_text[0], linsiz);
- i++;
- nline++;
- }
- if (newline(FFRAND, 1) == FALSE)
- return (FALSE);
- nline++;
- }
- while (((c = kremove(i)) >= 0))
- if (linsert(1, c) == FALSE)
- return (FALSE);
- else
- i++;
- }
-
- lp = curwp->w_linep; /* Cosmetic adjustment */
- if (curwp->w_dotp == lp) { /* if offscreen insert. */
- while (nline-- && lback(lp) != curbp->b_linep)
- lp = lback(lp);
- curwp->w_linep = lp; /* Adjust framing. */
- curwp->w_flag |= WFHARD;
- }
- return TRUE;
- }
-
- #ifdef NOTAB
- /* ARGSUSED */
- space_to_tabstop(f, n)
- int f, n;
- {
- if (n < 0)
- return FALSE;
- if (n == 0)
- return TRUE;
- return linsert((n << 3) - (curwp->w_doto & 7), ' ');
- }
- #endif
-