X-Git-Url: https://pd.if.org/git/?p=pd_readline;a=blobdiff_plain;f=mg%2Frandom.c;fp=mg%2Frandom.c;h=27fd0c3fde80979a9cded4167bdb61303ec29d53;hp=0000000000000000000000000000000000000000;hb=a9843085ec916c175bd245a8398f30e6cc03f984;hpb=26fe4e09c6c3c250334fdeed60ce3061febecde2

diff --git a/mg/random.c b/mg/random.c
new file mode 100644
index 0000000..27fd0c3
--- /dev/null
+++ b/mg/random.c
@@ -0,0 +1,496 @@
+/*	$OpenBSD: random.c,v 1.31 2012/05/18 02:13:44 lum Exp $	*/
+
+/* This file is in the public domain. */
+
+/*
+ *		Assorted commands.
+ * This 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"
+
+#include <ctype.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 =".
+ */
+/* ARGSUSED */
+int
+showcpos(int f, int n)
+{
+	struct line	*clp;
+	long	 nchar, cchar;
+	int	 nline, row;
+	int	 cline, cbyte;		/* Current line/char/byte */
+	int	 ratio;
+
+	/* collect the data */
+	clp = bfirstlp(curbp);
+	cchar = 0;
+	cline = 0;
+	cbyte = 0;
+	nchar = 0;
+	nline = 0;
+	for (;;) {
+		/* count this line */
+		++nline;
+		if (clp == curwp->w_dotp) {
+			/* mark line */
+			cline = nline;
+			cchar = nchar + curwp->w_doto;
+			if (curwp->w_doto == llength(clp))
+				cbyte = '\n';
+			else
+				cbyte = lgetc(clp, curwp->w_doto);
+		}
+		/* now count the chars */
+		nchar += llength(clp);
+		clp = lforw(clp);
+		if (clp == curbp->b_headp)
+			break;
+		/* count the newline */
+		nchar++;
+	}
+	/* determine row */
+	row = curwp->w_toprow + 1;
+	clp = curwp->w_linep;
+	while (clp != curbp->b_headp && 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);
+}
+
+int
+getcolpos(void)
+{
+	int	col, i, c;
+	char tmp[5];
+
+	/* determine column */
+	col = 0;
+
+	for (i = 0; i < curwp->w_doto; ++i) {
+		c = lgetc(curwp->w_dotp, i);
+		if (c == '\t'
+#ifdef NOTAB
+		    && !(curbp->b_flag & BFNOTAB)
+#endif /* NOTAB */
+			) {
+			col |= 0x07;
+			col++;
+		} else if (ISCTRL(c) != FALSE)
+			col += 2;
+		else if (isprint(c)) {
+			col++;
+		} else {
+			col += snprintf(tmp, sizeof(tmp), "\\%o", c);
+		}
+
+	}
+	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 */
+int
+twiddle(int f, int n)
+{
+	struct line	*dotp;
+	int	 doto, cr;
+	int	 fudge = FALSE;
+
+	dotp = curwp->w_dotp;
+	doto = curwp->w_doto;
+	if (doto == llength(dotp)) {
+		if (--doto <= 0)
+			return (FALSE);
+		(void)backchar(FFRAND, 1);
+		fudge = TRUE;
+	} else {
+		if (doto == 0)
+			return (FALSE);
+	}
+	undo_boundary_enable(FFRAND, 0);
+	cr = lgetc(dotp, doto - 1);
+	(void)backdel(FFRAND, 1);
+	(void)forwchar(FFRAND, 1);
+	linsert(1, cr);
+	if (fudge != TRUE)
+		(void)backchar(FFRAND, 1);
+	undo_boundary_enable(FFRAND, 1);
+	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 processors.  They even handle the looping.  Normally this
+ * is bound to "C-O".
+ */
+/* ARGSUSED */
+int
+openline(int f, int n)
+{
+	int	i, s;
+
+	if (n < 0)
+		return (FALSE);
+	if (n == 0)
+		return (TRUE);
+
+	/* insert newlines */
+	undo_boundary_enable(FFRAND, 0);
+	i = n;
+	do {
+		s = lnewline();
+	} while (s == TRUE && --i);
+
+	/* then go back up overtop of them all */
+	if (s == TRUE)
+		s = backchar(f | FFRAND, n);
+	undo_boundary_enable(FFRAND, 1);
+	return (s);
+}
+
+/*
+ * Insert a newline.
+ */
+/* ARGSUSED */
+int
+newline(int f, int n)
+{
+	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.
+ */
+/* ARGSUSED */
+int
+deblank(int f, int n)
+{
+	struct line	*lp1, *lp2;
+	RSIZE	 nld;
+
+	lp1 = curwp->w_dotp;
+	while (llength(lp1) == 0 && (lp2 = lback(lp1)) != curbp->b_headp)
+		lp1 = lp2;
+	lp2 = lp1;
+	nld = (RSIZE)0;
+	while ((lp2 = lforw(lp2)) != curbp->b_headp && llength(lp2) == 0)
+		++nld;
+	if (nld == 0)
+		return (TRUE);
+	curwp->w_dotp = lforw(lp1);
+	curwp->w_doto = 0;
+	return (ldelete((RSIZE)nld, KNONE));
+}
+
+/*
+ * Delete any whitespace around dot, then insert a space.
+ */
+int
+justone(int f, int n)
+{
+	undo_boundary_enable(FFRAND, 0);
+	(void)delwhite(f, n);
+	linsert(1, ' ');
+	undo_boundary_enable(FFRAND, 1);
+	return (TRUE);
+}
+
+/*
+ * Delete any whitespace around dot.
+ */
+/* ARGSUSED */
+int
+delwhite(int f, int n)
+{
+	int	col, s;
+
+	col = curwp->w_doto;
+
+	while (col < llength(curwp->w_dotp) &&
+	    (isspace(lgetc(curwp->w_dotp, col))))
+		++col;
+	do {
+		if (curwp->w_doto == 0) {
+			s = FALSE;
+			break;
+		}
+		if ((s = backchar(FFRAND, 1)) != TRUE)
+			break;
+	} while (isspace(lgetc(curwp->w_dotp, curwp->w_doto)));
+
+	if (s == TRUE)
+		(void)forwchar(FFRAND, 1);
+	(void)ldelete((RSIZE)(col - curwp->w_doto), KNONE);
+	return (TRUE);
+}
+
+/*
+ * Delete any leading whitespace on the current line
+ */
+int
+delleadwhite(int f, int n)
+{
+	int soff, ls;
+	struct line *slp;
+
+	/* Save current position */
+	slp = curwp->w_dotp;
+	soff = curwp->w_doto;
+
+	for (ls = 0; ls < llength(slp); ls++)
+                 if (!isspace(lgetc(slp, ls)))
+                        break;
+	gotobol(FFRAND, 1);
+	forwdel(FFRAND, ls);
+	soff -= ls;
+	if (soff < 0)
+		soff = 0;
+	forwchar(FFRAND, soff);
+
+	return (TRUE);
+}
+
+/*
+ * Delete any trailing whitespace on the current line
+ */
+int
+deltrailwhite(int f, int n)
+{
+	int soff;
+
+	/* Save current position */
+	soff = curwp->w_doto;
+
+	gotoeol(FFRAND, 1);
+	delwhite(FFRAND, 1);
+
+	/* restore original position, if possible */
+	if (soff < curwp->w_doto)
+		curwp->w_doto = soff;
+
+	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 subcommands failed. Normally bound to "C-M".
+ */
+/* ARGSUSED */
+int
+lfindent(int f, int n)
+{
+	int	c, i, nicol;
+	int	s = TRUE;
+
+	if (n < 0)
+		return (FALSE);
+
+	undo_boundary_enable(FFRAND, 0);
+	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 /* NOTAB */
+		    ((i = nicol / 8) != 0 && linsert(i, '\t') == FALSE) ||
+		    ((i = nicol % 8) != 0 && linsert(i, ' ') == FALSE)))) {
+			s = FALSE;
+			break;
+		}
+	}
+	undo_boundary_enable(FFRAND, 1);
+	return (s);
+}
+
+/*
+ * Indent the current line. Delete existing leading whitespace,
+ * and use tabs/spaces to achieve correct indentation. Try
+ * to leave dot where it started.
+ */
+int
+indent(int f, int n)
+{
+	int soff, i;
+
+	if (n < 0)
+		return (FALSE);
+
+	delleadwhite(FFRAND, 1);
+
+	/* If not invoked with a numerical argument, done */
+	if (!(f & FFARG))
+		return (TRUE);
+
+	/* insert appropriate whitespace */
+	soff = curwp->w_doto;
+	(void)gotobol(FFRAND, 1);
+	if (
+#ifdef	NOTAB
+	    (curbp->b_flag & BFNOTAB) ? linsert(n, ' ') == FALSE :
+#endif /* NOTAB */
+	    (((i = n / 8) != 0 && linsert(i, '\t') == FALSE) ||
+	    ((i = n % 8) != 0 && linsert(i, ' ') == FALSE)))
+		return (FALSE);
+
+	forwchar(FFRAND, soff);
+
+	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 */
+int
+forwdel(int f, int n)
+{
+	if (n < 0)
+		return (backdel(f | FFRAND, -n));
+
+	/* really a kill */
+	if (f & FFARG) {
+		if ((lastflag & CFKILL) == 0)
+			kdelete();
+		thisflag |= CFKILL;
+	}
+
+	return (ldelete((RSIZE) n, (f & FFARG) ? KFORW : KNONE));
+}
+
+/*
+ * 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.
+ */
+/* ARGSUSED */
+int
+backdel(int f, int n)
+{
+	int	s;
+
+	if (n < 0)
+		return (forwdel(f | FFRAND, -n));
+
+	/* really a kill */
+	if (f & FFARG) {
+		if ((lastflag & CFKILL) == 0)
+			kdelete();
+		thisflag |= CFKILL;
+	}
+	if ((s = backchar(f | FFRAND, n)) == TRUE)
+		s = ldelete((RSIZE)n, (f & FFARG) ? KFORW : KNONE);
+
+	return (s);
+}
+
+#ifdef	NOTAB
+/* ARGSUSED */
+int
+space_to_tabstop(int f, int n)
+{
+	if (n < 0)
+		return (FALSE);
+	if (n == 0)
+		return (TRUE);
+	return (linsert((n << 3) - (curwp->w_doto & 7), ' '));
+}
+#endif /* NOTAB */
+
+/*
+ * Move the dot to the first non-whitespace character of the current line.
+ */
+int
+backtoindent(int f, int n)
+{
+	gotobol(FFRAND, 1);
+	while (curwp->w_doto < llength(curwp->w_dotp) &&
+	    (isspace(lgetc(curwp->w_dotp, curwp->w_doto))))
+		++curwp->w_doto;
+	return (TRUE);
+}
+
+/*
+ * Join the current line to the previous, or with arg, the next line
+ * to the current one.  If the former line is not empty, leave exactly
+ * one space at the joint.  Otherwise, leave no whitespace.
+ */
+int
+joinline(int f, int n)
+{
+	int doto;
+
+	undo_boundary_enable(FFRAND, 0);
+	if (f & FFARG) {
+		gotoeol(FFRAND, 1);
+		forwdel(FFRAND, 1);
+	} else {
+		gotobol(FFRAND, 1);
+		backdel(FFRAND, 1);
+	}
+
+	delwhite(FFRAND, 1);
+
+	if ((doto = curwp->w_doto) > 0) {
+		linsert(1, ' ');
+		curwp->w_doto = doto;
+	}
+	undo_boundary_enable(FFRAND, 1);
+
+	return (TRUE);
+}