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b8ba871bd9
files, curses, db, regex etc that we already have). The other glue will follow shortly. Obtained from: Keith Bostic <bostic@bostic.com>
192 lines
4.5 KiB
C
192 lines
4.5 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)ex_shift.c 10.11 (Berkeley) 9/15/96";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <bitstring.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../common/common.h"
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enum which {LEFT, RIGHT};
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static int shift __P((SCR *, EXCMD *, enum which));
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/*
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* ex_shiftl -- :<[<...]
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*
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*
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* PUBLIC: int ex_shiftl __P((SCR *, EXCMD *));
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*/
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int
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ex_shiftl(sp, cmdp)
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SCR *sp;
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EXCMD *cmdp;
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{
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return (shift(sp, cmdp, LEFT));
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}
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/*
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* ex_shiftr -- :>[>...]
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*
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* PUBLIC: int ex_shiftr __P((SCR *, EXCMD *));
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*/
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int
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ex_shiftr(sp, cmdp)
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SCR *sp;
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EXCMD *cmdp;
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{
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return (shift(sp, cmdp, RIGHT));
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}
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/*
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* shift --
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* Ex shift support.
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*/
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static int
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shift(sp, cmdp, rl)
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SCR *sp;
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EXCMD *cmdp;
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enum which rl;
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{
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recno_t from, to;
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size_t blen, len, newcol, newidx, oldcol, oldidx, sw;
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int curset;
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char *p, *bp, *tbp;
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NEEDFILE(sp, cmdp);
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if (O_VAL(sp, O_SHIFTWIDTH) == 0) {
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msgq(sp, M_INFO, "152|shiftwidth option set to 0");
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return (0);
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}
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/* Copy the lines being shifted into the unnamed buffer. */
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if (cut(sp, NULL, &cmdp->addr1, &cmdp->addr2, CUT_LINEMODE))
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return (1);
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/*
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* The historic version of vi permitted the user to string any number
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* of '>' or '<' characters together, resulting in an indent of the
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* appropriate levels. There's a special hack in ex_cmd() so that
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* cmdp->argv[0] points to the string of '>' or '<' characters.
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*
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* Q: What's the difference between the people adding features
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* to vi and the Girl Scouts?
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* A: The Girl Scouts have mint cookies and adult supervision.
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*/
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for (p = cmdp->argv[0]->bp, sw = 0; *p == '>' || *p == '<'; ++p)
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sw += O_VAL(sp, O_SHIFTWIDTH);
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GET_SPACE_RET(sp, bp, blen, 256);
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curset = 0;
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for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
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if (db_get(sp, from, DBG_FATAL, &p, &len))
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goto err;
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if (!len) {
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if (sp->lno == from)
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curset = 1;
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continue;
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}
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/*
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* Calculate the old indent amount and the number of
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* characters it used.
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*/
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for (oldidx = 0, oldcol = 0; oldidx < len; ++oldidx)
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if (p[oldidx] == ' ')
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++oldcol;
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else if (p[oldidx] == '\t')
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oldcol += O_VAL(sp, O_TABSTOP) -
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oldcol % O_VAL(sp, O_TABSTOP);
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else
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break;
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/* Calculate the new indent amount. */
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if (rl == RIGHT)
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newcol = oldcol + sw;
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else {
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newcol = oldcol < sw ? 0 : oldcol - sw;
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if (newcol == oldcol) {
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if (sp->lno == from)
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curset = 1;
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continue;
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}
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}
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/* Get a buffer that will hold the new line. */
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ADD_SPACE_RET(sp, bp, blen, newcol + len);
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/*
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* Build a new indent string and count the number of
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* characters it uses.
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*/
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for (tbp = bp, newidx = 0;
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newcol >= O_VAL(sp, O_TABSTOP); ++newidx) {
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*tbp++ = '\t';
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newcol -= O_VAL(sp, O_TABSTOP);
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}
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for (; newcol > 0; --newcol, ++newidx)
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*tbp++ = ' ';
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/* Add the original line. */
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memcpy(tbp, p + oldidx, len - oldidx);
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/* Set the replacement line. */
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if (db_set(sp, from, bp, (tbp + (len - oldidx)) - bp)) {
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err: FREE_SPACE(sp, bp, blen);
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return (1);
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}
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/*
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* !!!
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* The shift command in historic vi had the usual bizarre
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* collection of cursor semantics. If called from vi, the
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* cursor was repositioned to the first non-blank character
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* of the lowest numbered line shifted. If called from ex,
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* the cursor was repositioned to the first non-blank of the
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* highest numbered line shifted. Here, if the cursor isn't
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* part of the set of lines that are moved, move it to the
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* first non-blank of the last line shifted. (This makes
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* ":3>>" in vi work reasonably.) If the cursor is part of
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* the shifted lines, it doesn't get moved at all. This
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* permits shifting of marked areas, i.e. ">'a." shifts the
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* marked area twice, something that couldn't be done with
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* historic vi.
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*/
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if (sp->lno == from) {
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curset = 1;
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if (newidx > oldidx)
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sp->cno += newidx - oldidx;
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else if (sp->cno >= oldidx - newidx)
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sp->cno -= oldidx - newidx;
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}
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}
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if (!curset) {
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sp->lno = to;
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sp->cno = 0;
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(void)nonblank(sp, to, &sp->cno);
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}
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FREE_SPACE(sp, bp, blen);
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sp->rptlines[L_SHIFT] += cmdp->addr2.lno - cmdp->addr1.lno + 1;
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return (0);
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}
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