home *** CD-ROM | disk | FTP | other *** search
- /*
- * Name: MicroEMACS
- * Assorted commands.
- * Version: 29
- * Last edit: 10-Feb-86
- * By: rex::conroy
- * decvax!decwrl!dec-rhea!dec-rex!conroy
- *
- * 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 "def.h"
-
- /*
- * 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 =".
- */
- showcpos(f, n, k)
- {
- register LINE *clp;
- register int cbo;
- register int nchar;
- register int cchar;
- register int nline;
- register int cline;
- register int cbyte;
- register int ratio;
- register int row;
- register int col;
- register int i;
- register int c;
-
- clp = lforw(curbp->b_linep); /* Collect the data. */
- cbo = 0;
- nchar = 0;
- nline = 1; /* Origin 1. */
- for (;;) {
- if (clp == curwp->w_dotp) {
- cline = nline;
- if (cbo == curwp->w_doto) {
- cchar = nchar;
- if (cbo == llength(clp))
- cbyte = '\n';
- else
- cbyte = lgetc(clp, cbo);
- }
- }
- if (cbo == llength(clp)) {
- if (clp == curbp->b_linep)
- break;
- clp = lforw(clp);
- cbo = 0;
- ++nline; /* Count a line. */
- } else
- ++cbo;
- ++nchar; /* Count a character. */
- }
- row = curwp->w_toprow; /* Determine row. */
- clp = curwp->w_linep;
- while (clp!=curbp->b_linep && clp!=curwp->w_dotp) {
- ++row;
- clp = lforw(clp);
- }
- ++row; /* Convert to origin 1. */
- col = 0; /* Determine column. */
- for (i=0; i<curwp->w_doto; ++i) {
- c = lgetc(curwp->w_dotp, i);
- if (c == '\t')
- col |= 0x07;
- else if (ISCTRL(c) != FALSE)
- ++col;
- ++col;
- }
- ++col; /* Convert to origin 1. */
- ratio = 0; /* Ratio before dot. */
- if (nchar != 0) {
- ratio = (100L*cchar) / nchar;
- if (ratio==0 && cchar!=0) /* Allow 0% only at the */
- ratio = 1; /* start of the file. */
- }
- eprintf("[CH:0%o Line:%d Row:%d Col:%d %d%% of %d]",
- cbyte, cline, row, col, ratio, nchar);
- return (TRUE);
- }
-
- /*
- * 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.
- */
- twiddle(f, n, k)
- {
- register LINE *dotp;
- register int doto;
- register int cl;
- register int cr;
-
- dotp = curwp->w_dotp;
- doto = curwp->w_doto;
- if (doto==llength(dotp) && --doto<0)
- return (FALSE);
- cr = lgetc(dotp, doto);
- if (--doto < 0)
- return (FALSE);
- cl = lgetc(dotp, doto);
- lputc(dotp, doto+0, cr);
- lputc(dotp, doto+1, cl);
- lchange(WFEDIT);
- return (TRUE);
- }
-
- /*
- * Quote the next character, and
- * insert it into the buffer. All the characters
- * are taken literally, with the exception of the newline,
- * which always has its line splitting meaning. The character
- * is always read, even if it is inserted 0 times, for
- * regularity.
- */
- quote(f, n, k)
- {
- register int s;
- register int c;
-
- if (kbdmop != NULL)
- c = *kbdmop++;
- else {
- c = ttgetc();
- if (kbdmip != NULL) {
- if (kbdmip > &kbdm[NKBDM-4]) {
- ctrlg(FALSE, 0, KRANDOM);
- return (ABORT);
- }
- *kbdmip++ = c;
- }
- }
- if (n < 0)
- return (FALSE);
- if (n == 0)
- return (TRUE);
- if (c == '\n') {
- do {
- s = lnewline();
- } while (s==TRUE && --n);
- return (s);
- }
- return (linsert(n, c));
- }
-
- /*
- * Ordinary text characters are bound to this function,
- * which inserts them into the buffer. Characters marked as control
- * characters (using the CTRL flag) may be remapped to their ASCII
- * equivalent. This makes TAB (C-I) work right, and also makes the
- * world look reasonable if a control character is bound to this
- * this routine by hand. Any META or CTLX flags on the character
- * are discarded. This is the only routine that actually looks
- * the the "k" argument.
- */
- selfinsert(f, n, k)
- {
- register int c;
-
- if (n < 0)
- return (FALSE);
- if (n == 0)
- return (TRUE);
- c = k & KCHAR;
- if ((k&KCTRL)!=0 && c>='@' && c<='_') /* ASCII-ify. */
- c -= '@';
- return (linsert(n, c));
- }
-
- /*
- * 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".
- */
- openline(f, n, k)
- {
- 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, n, KRANDOM); /* of them all. */
- return (s);
- }
-
- /*
- * Insert a newline.
- * If you are at the end of the line and the
- * next line is a blank line, just move into the
- * blank line. This makes "C-O" and "C-X C-O" work
- * nicely, and reduces the ammount of screen
- * update that has to be done. This would not be
- * as critical if screen update were a lot
- * more efficient.
- */
- newline(f, n, k)
- {
- register LINE *lp;
- register int s;
-
- if (n < 0)
- return (FALSE);
- while (n--) {
- lp = curwp->w_dotp;
- if (llength(lp) == curwp->w_doto
- && lp != curbp->b_linep
- && llength(lforw(lp)) == 0) {
- if ((s=forwchar(FALSE, 1, KRANDOM)) != TRUE)
- return (s);
- } else 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.
- */
- deblank(f, n, k)
- {
- register LINE *lp1;
- register LINE *lp2;
- register int nld;
-
- lp1 = curwp->w_dotp;
- while (llength(lp1)==0 && (lp2=lback(lp1))!=curbp->b_linep)
- lp1 = lp2;
- lp2 = lp1;
- nld = 0;
- while ((lp2=lforw(lp2))!=curbp->b_linep && llength(lp2)==0)
- ++nld;
- if (nld == 0)
- return (TRUE);
- curwp->w_dotp = lforw(lp1);
- curwp->w_doto = 0;
- return (ldelete(nld, FALSE));
- }
-
- /*
- * 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".
- */
- indent(f, n, k)
- {
- 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
- || ((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".
- */
- forwdel(f, n, k)
- {
- if (n < 0)
- return (backdel(f, -n, KRANDOM));
- if (f != FALSE) { /* Really a kill. */
- if ((lastflag&CFKILL) == 0)
- kdelete();
- thisflag |= CFKILL;
- }
- return (ldelete(n, f));
- }
-
- /*
- * Delete backwards. This is quite easy too,
- * because it's all done with other functions. Just
- * move the cursor back, and delete forwards.
- * Like delete forward, this actually does a kill
- * if presented with an argument.
- */
- backdel(f, n, k)
- {
- register int s;
-
- if (n < 0)
- return (forwdel(f, -n, KRANDOM));
- if (f != FALSE) { /* Really a kill. */
- if ((lastflag&CFKILL) == 0)
- kdelete();
- thisflag |= CFKILL;
- }
- if ((s=backchar(f, n, KRANDOM)) == TRUE)
- s = ldelete(n, f);
- return (s);
- }
-
- /*
- * 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.
- */
- killline(f, n, k)
- {
- register int chunk;
- register LINE *nextp;
-
- if ((lastflag&CFKILL) == 0) /* Clear kill buffer if */
- kdelete(); /* last wasn't a kill. */
- thisflag |= CFKILL;
- if (f == FALSE) {
- chunk = llength(curwp->w_dotp)-curwp->w_doto;
- if (chunk == 0)
- chunk = 1;
- } else if (n > 0) {
- chunk = llength(curwp->w_dotp)-curwp->w_doto+1;
- nextp = lforw(curwp->w_dotp);
- while (--n) {
- if (nextp == curbp->b_linep)
- return (FALSE);
- chunk += llength(nextp)+1;
- nextp = lforw(nextp);
- }
- } else { /* n <= 0 */
- chunk = curwp->w_doto;
- curwp->w_doto = 0;
- while (n++) {
- if (lback(curwp->w_dotp) == curbp->b_linep)
- break;
- curwp->w_dotp = lback(curwp->w_dotp);
- curwp->w_flag |= WFMOVE;
- chunk += llength(curwp->w_dotp)+1;
- }
- }
- return (ldelete(chunk, TRUE));
- }
-
- /*
- * 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).
- */
- yank(f, n, k)
- {
- register int c;
- register int i;
- register LINE *lp;
- register int nline;
-
- if (n < 0)
- return (FALSE);
- nline = 0; /* Newline counting. */
- while (n--) {
- i = 0;
- while ((c=kremove(i)) >= 0) {
- if (c == '\n') {
- if (newline(FALSE, 1, KRANDOM) == FALSE)
- return (FALSE);
- ++nline;
- } else {
- if (linsert(1, c) == FALSE)
- return (FALSE);
- }
- ++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);
- }
-