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/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#if !defined(lint) && defined(DOSCCS)
static char *sccsid = "@(#)ex_vwind.c 7.3 (Berkeley) 6/7/85";
#endif
#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().
*/
vmoveto(addr, curs, context)
register line *addr;
char *curs;
char context;
{
markit(addr);
vsave();
vjumpto(addr, curs, context);
}
/*
* Vjumpto is like vmoveto, but doesn't mark previous
* context or save linebuf as current line.
*/
vjumpto(addr, curs, context)
register line *addr;
char *curs;
char 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.
*/
vupdown(cnt, curs)
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.
*/
vup(cnt, ind, scroll)
register int cnt, ind;
bool 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.
*/
vdown(cnt, ind, scroll)
register int cnt, ind;
bool 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.
*/
vcontext(addr, where)
register line *addr;
char 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.
*/
vclean()
{
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.
*/
vshow(addr, top)
line *addr, *top;
{
#ifndef CBREAK
register bool fried = 0;
#endif
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;
#ifndef CBREAK
if (vcookit(2))
fried++, vcook();
#endif
oldhold = hold;
hold |= HOLDAT;
vclear();
vreset(0);
vredraw(WTOP);
/* error if vcline >= vcnt ! */
vcline = addr - top;
dot = addr;
getDOT();
hold = oldhold;
vsync(LASTLINE);
#ifndef CBREAK
if (fried)
flusho(), vraw();
#endif
}
/*
* 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.
*/
vreset(inecho)
bool 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(tp, cnt)
register int cnt;
register line *tp;
{
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?
*/
vfit(tp, cnt)
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.
*/
vroll(cnt)
register int cnt;
{
#ifndef CBREAK
register bool fried = 0;
#endif
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();
}
#ifndef CBREAK
if (vcookit(cnt))
fried++, vcook();
#endif
for (; cnt > 0 && Peekkey != ATTN; cnt--) {
dot++, vcline++;
vopen(dot, LASTLINE);
vscrap();
}
hold = oldhold;
if (state == HARDOPEN)
sethard();
vsyncCL();
#ifndef CBREAK
if (fried)
flusho(), vraw();
#endif
}
/*
* Roll backwards (scroll up).
*/
vrollR(cnt)
register int cnt;
{
register bool fried = 0;
short oldhold = hold;
#ifdef ADEBUG
if (trace)
tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT());
#endif
#ifndef CBREAK
if (vcookit(cnt))
fried++, vcook();
#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));
#ifndef CBREAK
if (fried)
flusho(), vraw();
#endif
}
/*
* 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.
*/
vcookit(cnt)
register int cnt;
{
return (cnt > 1 && (o_speed < B1200 && !initev || cnt > LINES * 2));
}
/*
* Determine displayed depth of current line.
*/
vdepth()
{
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.
*/
vnline(curs)
char *curs;
{
if (curs)
wcursor = curs;
else if (vmoving)
wcursor = vfindcol(vmovcol);
else
wcursor = vskipwh(linebuf);
cursor = linebuf;
vmove();
}