mirror of https://github.com/tildeclub/ex-vi.git
501 lines
11 KiB
C
501 lines
11 KiB
C
/*
|
|
* This code contains changes by
|
|
* Gunnar Ritter, Freiburg i. Br., Germany, 2002. All rights reserved.
|
|
*
|
|
* Conditions 1, 2, and 4 and the no-warranty notice below apply
|
|
* to these changes.
|
|
*
|
|
*
|
|
* Copyright (c) 1980, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*
|
|
* Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* Redistributions of source code and documentation must retain the
|
|
* above copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed or owned by Caldera
|
|
* International, Inc.
|
|
* Neither the name of Caldera International, Inc. nor the names of
|
|
* other contributors may be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
|
|
* INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
|
|
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
|
|
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
#ifdef DOSCCS
|
|
static char sccsid[] = "@(#)ex_vwind.c 1.9 (gritter) 11/23/04";
|
|
#endif
|
|
#endif
|
|
|
|
/* from ex_vwind.c 7.3 (Berkeley) 6/7/85 */
|
|
|
|
#include "ex.h"
|
|
#include "ex_tty.h"
|
|
#include "ex_vis.h"
|
|
|
|
/*
|
|
* Routines to adjust the window, showing specified lines
|
|
* in certain positions on the screen, and scrolling in both
|
|
* directions. Code here is very dependent on mode (open versus visual).
|
|
*/
|
|
|
|
/*
|
|
* Move in a nonlocal way to line addr.
|
|
* If it isn't on screen put it in specified context.
|
|
* New position for cursor is curs.
|
|
* Like most routines here, we vsave().
|
|
*/
|
|
void
|
|
vmoveto(register line *addr, char *curs, int context)
|
|
{
|
|
|
|
markit(addr);
|
|
vsave();
|
|
vjumpto(addr, curs, context);
|
|
}
|
|
|
|
/*
|
|
* Vjumpto is like vmoveto, but doesn't mark previous
|
|
* context or save linebuf as current line.
|
|
*/
|
|
void
|
|
vjumpto(register line *addr, char *curs, int context)
|
|
{
|
|
|
|
noteit(0);
|
|
if (context != 0)
|
|
vcontext(addr, context);
|
|
else
|
|
vshow(addr, NOLINE);
|
|
noteit(1);
|
|
vnline(curs);
|
|
}
|
|
|
|
/*
|
|
* Go up or down cnt (negative is up) to new position curs.
|
|
*/
|
|
void
|
|
vupdown(register int cnt, char *curs)
|
|
{
|
|
|
|
if (cnt > 0)
|
|
vdown(cnt, 0, 0);
|
|
else if (cnt < 0)
|
|
vup(-cnt, 0, 0);
|
|
if (vcnt == 0)
|
|
vrepaint(curs);
|
|
else
|
|
vnline(curs);
|
|
}
|
|
|
|
/*
|
|
* Go up cnt lines, afterwards preferring to be ind
|
|
* logical lines from the top of the screen.
|
|
* If scroll, then we MUST use a scroll.
|
|
* Otherwise clear and redraw if motion is far.
|
|
*/
|
|
void
|
|
vup(register int cnt, register int ind, int scroll)
|
|
{
|
|
register int i, tot;
|
|
|
|
if (dot == one) {
|
|
beep();
|
|
return;
|
|
}
|
|
vsave();
|
|
i = lineDOT() - 1;
|
|
if (cnt > i) {
|
|
ind -= cnt - i;
|
|
if (ind < 0)
|
|
ind = 0;
|
|
cnt = i;
|
|
}
|
|
if (!scroll && cnt <= vcline) {
|
|
vshow(dot - cnt, NOLINE);
|
|
return;
|
|
}
|
|
cnt -= vcline, dot -= vcline, vcline = 0;
|
|
if (hold & HOLDWIG)
|
|
goto contxt;
|
|
if (state == VISUAL && !AL && !SR &&
|
|
cnt <= WTOP - ZERO && vfit(dot - cnt, cnt) <= WTOP - ZERO)
|
|
goto okr;
|
|
tot = WECHO - ZERO;
|
|
if (state != VISUAL || (!AL && !SR) || (!scroll && (cnt > tot || vfit(dot - cnt, cnt) > tot / 3 + 1))) {
|
|
if (ind > basWLINES / 2)
|
|
ind = basWLINES / 3;
|
|
contxt:
|
|
vcontext(dot + ind - cnt, '.');
|
|
return;
|
|
}
|
|
okr:
|
|
vrollR(cnt);
|
|
if (scroll) {
|
|
vcline += ind, dot += ind;
|
|
if (vcline >= vcnt)
|
|
dot -= vcline - vcnt + 1, vcline = vcnt - 1;
|
|
getDOT();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Like vup, but scrolling down.
|
|
*/
|
|
void
|
|
vdown(register int cnt, register int ind, int scroll)
|
|
{
|
|
register int i, tot;
|
|
|
|
if (dot == dol) {
|
|
beep();
|
|
return;
|
|
}
|
|
vsave();
|
|
i = dol - dot;
|
|
if (cnt > i) {
|
|
ind -= cnt - i;
|
|
if (ind < 0)
|
|
ind = 0;
|
|
cnt = i;
|
|
}
|
|
i = vcnt - vcline - 1;
|
|
if (!scroll && cnt <= i) {
|
|
vshow(dot + cnt, NOLINE);
|
|
return;
|
|
}
|
|
cnt -= i, dot += i, vcline += i;
|
|
if (hold & HOLDWIG)
|
|
goto dcontxt;
|
|
if (!scroll) {
|
|
tot = WECHO - ZERO;
|
|
if (state != VISUAL || cnt - tot > 0 || vfit(dot, cnt) > tot / 3 + 1) {
|
|
dcontxt:
|
|
vcontext(dot + cnt, '.');
|
|
return;
|
|
}
|
|
}
|
|
if (cnt > 0)
|
|
vroll(cnt);
|
|
if (state == VISUAL && scroll) {
|
|
vcline -= ind, dot -= ind;
|
|
if (vcline < 0)
|
|
dot -= vcline, vcline = 0;
|
|
getDOT();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Show line addr in context where on the screen.
|
|
* Work here is in determining new top line implied by
|
|
* this placement of line addr, since we always draw from the top.
|
|
*/
|
|
void
|
|
vcontext(register line *addr, int where)
|
|
{
|
|
register line *top;
|
|
|
|
getline(*addr);
|
|
if (state != VISUAL)
|
|
top = addr;
|
|
else switch (where) {
|
|
|
|
case '^':
|
|
addr = vback(addr, basWLINES - vdepth());
|
|
getline(*addr);
|
|
/* fall into ... */
|
|
|
|
case '-':
|
|
top = vback(addr, basWLINES - vdepth());
|
|
getline(*addr);
|
|
break;
|
|
|
|
case '.':
|
|
top = vback(addr, basWLINES / 2 - vdepth());
|
|
getline(*addr);
|
|
break;
|
|
|
|
default:
|
|
top = addr;
|
|
break;
|
|
}
|
|
if (state == ONEOPEN && LINE(0) == WBOT)
|
|
vup1();
|
|
vcnt = vcline = 0;
|
|
vclean();
|
|
if (state == CRTOPEN)
|
|
vup1();
|
|
vshow(addr, top);
|
|
}
|
|
|
|
/*
|
|
* Get a clean line. If we are in a hard open
|
|
* we may be able to reuse the line we are on
|
|
* if it is blank. This is a real win.
|
|
*/
|
|
void
|
|
vclean(void)
|
|
{
|
|
|
|
if (state != VISUAL && state != CRTOPEN) {
|
|
destcol = 0;
|
|
if (!ateopr())
|
|
vup1();
|
|
vcnt = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Show line addr with the specified top line on the screen.
|
|
* Top may be 0; in this case have vcontext compute the top
|
|
* (and call us recursively). Eventually, we clear the screen
|
|
* (or its open mode equivalent) and redraw.
|
|
*/
|
|
void
|
|
vshow(line *addr, line *top)
|
|
{
|
|
register int cnt = addr - dot;
|
|
register int i = vcline + cnt;
|
|
short oldhold = hold;
|
|
|
|
if (state != HARDOPEN && state != ONEOPEN && i >= 0 && i < vcnt) {
|
|
dot = addr;
|
|
getDOT();
|
|
vcline = i;
|
|
return;
|
|
}
|
|
if (state != VISUAL) {
|
|
dot = addr;
|
|
vopen(dot, WBOT);
|
|
return;
|
|
}
|
|
if (top == 0) {
|
|
vcontext(addr, '.');
|
|
return;
|
|
}
|
|
dot = top;
|
|
oldhold = hold;
|
|
hold |= HOLDAT;
|
|
vclear();
|
|
vreset(0);
|
|
vredraw(WTOP);
|
|
/* error if vcline >= vcnt ! */
|
|
vcline = addr - top;
|
|
dot = addr;
|
|
getDOT();
|
|
hold = oldhold;
|
|
vsync(LASTLINE);
|
|
}
|
|
|
|
/*
|
|
* reset the state.
|
|
* If inecho then leave us at the beginning of the echo
|
|
* area; we are called this way in the middle of a :e escape
|
|
* from visual, e.g.
|
|
*/
|
|
void
|
|
vreset(int inecho)
|
|
{
|
|
|
|
vcnt = vcline = 0;
|
|
WTOP = basWTOP;
|
|
WLINES = basWLINES;
|
|
if (inecho)
|
|
splitw = 1, vgoto(WECHO, 0);
|
|
}
|
|
|
|
/*
|
|
* Starting from which line preceding tp uses almost (but not more
|
|
* than) cnt physical lines?
|
|
*/
|
|
line *
|
|
vback(register line *tp, register int cnt)
|
|
{
|
|
register int d;
|
|
|
|
if (cnt > 0)
|
|
for (; tp > one; tp--) {
|
|
getline(tp[-1]);
|
|
d = vdepth();
|
|
if (d > cnt)
|
|
break;
|
|
cnt -= d;
|
|
}
|
|
return (tp);
|
|
}
|
|
|
|
/*
|
|
* How much scrolling will it take to roll cnt lines starting at tp?
|
|
*/
|
|
int
|
|
vfit(register line *tp, int cnt)
|
|
{
|
|
register int j;
|
|
|
|
j = 0;
|
|
while (cnt > 0) {
|
|
cnt--;
|
|
getline(tp[cnt]);
|
|
j += vdepth();
|
|
}
|
|
if (tp > dot)
|
|
j -= WBOT - LASTLINE;
|
|
return (j);
|
|
}
|
|
|
|
/*
|
|
* Roll cnt lines onto the screen.
|
|
*/
|
|
void
|
|
vroll(register int cnt)
|
|
{
|
|
short oldhold = hold;
|
|
|
|
#ifdef ADEBUG
|
|
if (trace)
|
|
tfixnl(), fprintf(trace, "vroll(%d)\n", cnt);
|
|
#endif
|
|
if (state != VISUAL)
|
|
hold |= HOLDAT|HOLDROL;
|
|
if (WBOT == WECHO) {
|
|
vcnt = 0;
|
|
if (state == ONEOPEN)
|
|
vup1();
|
|
}
|
|
for (; cnt > 0 && Peekkey != ATTN; cnt--) {
|
|
dot++, vcline++;
|
|
vopen(dot, LASTLINE);
|
|
vscrap();
|
|
}
|
|
hold = oldhold;
|
|
if (state == HARDOPEN)
|
|
sethard();
|
|
vsyncCL();
|
|
}
|
|
|
|
/*
|
|
* Roll backwards (scroll up).
|
|
*/
|
|
void
|
|
vrollR(register int cnt)
|
|
{
|
|
short oldhold = hold;
|
|
|
|
#ifdef ADEBUG
|
|
if (trace)
|
|
tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT());
|
|
#endif
|
|
if (WBOT == WECHO)
|
|
vcnt = 0;
|
|
heldech = 0;
|
|
hold |= HOLDAT|HOLDECH;
|
|
for (; cnt > 0 && Peekkey != ATTN; cnt--) {
|
|
dot--;
|
|
vopen(dot, WTOP);
|
|
vscrap();
|
|
}
|
|
hold = oldhold;
|
|
if (heldech)
|
|
vclrech(0);
|
|
vsync(LINE(vcnt-1));
|
|
}
|
|
|
|
/*
|
|
* Go into cooked mode (allow interrupts) during
|
|
* a scroll if we are at less than 1200 baud and not
|
|
* a 'vi' command, of if we are in a 'vi' command and the
|
|
* scroll is more than 2 full screens.
|
|
*
|
|
* BUG: An interrupt during a scroll in this way
|
|
* dumps to command mode.
|
|
*/
|
|
int
|
|
vcookit(register int cnt)
|
|
{
|
|
|
|
return (cnt > 1 && (ospeed < B1200 && !initev || cnt > TLINES * 2));
|
|
}
|
|
|
|
/*
|
|
* Determine displayed depth of current line.
|
|
*/
|
|
int
|
|
vdepth(void)
|
|
{
|
|
register int d;
|
|
|
|
d = (column(NOSTR) + WCOLS - 1 + (Putchar == listchar) + IN) / WCOLS;
|
|
#ifdef ADEBUG
|
|
if (trace)
|
|
tfixnl(), fprintf(trace, "vdepth returns %d\n", d == 0 ? 1 : d);
|
|
#endif
|
|
return (d == 0 ? 1 : d);
|
|
}
|
|
|
|
/*
|
|
* Move onto a new line, with cursor at position curs.
|
|
*/
|
|
void
|
|
vnline(char *curs)
|
|
{
|
|
|
|
if (curs)
|
|
wcursor = curs;
|
|
else if (vmoving)
|
|
wcursor = vfindcol(vmovcol);
|
|
else
|
|
wcursor = vskipwh(linebuf);
|
|
cursor = linebuf;
|
|
vmove(0);
|
|
}
|