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/*
* Position history
* Copyright
* (C) 1992 Joseph H. Allen
*
* This file is part of JOE (Joe's Own Editor)
*/
#include "types.h"
typedef struct pos POS;
struct pos {
LINK(POS) link;
P *p;
W *w;
};
POS pos = { {&pos, &pos} };
POS frpos = { {&frpos, &frpos} };
POS *curpos = &pos;
int npos = 0;
static void markpos(W *w, P *p)
{
POS *new = alitem(&frpos, sizeof(POS));
new->p = NULL;
pdupown(p, &new->p, USTR "markpos");
poffline(new->p);
new->w = w;
enqueb(POS, link, &pos, new);
if (npos == 20) {
new = pos.link.next;
prm(new->p);
demote(POS, link, &frpos, new);
} else {
++npos;
}
}
void afterpos(void)
{
if (curpos != &pos) {
demote(POS, link, &pos, curpos);
curpos = &pos;
}
}
void aftermove(W *w, P *p)
{
if (pos.link.prev != &pos && pos.link.prev->w == w && pos.link.prev->p && labs(pos.link.prev->p->line - p->line) < 3) {
poffline(pset(pos.link.prev->p, p));
} else {
markpos(w, p);
}
}
void windie(W *w)
{
POS *n;
for (n = pos.link.prev; n != &pos; n = n->link.prev) {
if (n->w == w) {
n->w = NULL;
}
}
}
int unextpos(BW *bw)
{
W *w = bw->parent;
lp:
if (curpos->link.next != &pos && curpos != &pos) {
curpos = curpos->link.next;
if (!curpos->p || !curpos->w) {
goto lp;
}
if (w->t->curwin == curpos->w && curpos->p->byte == ((BW *) w->t->curwin->object)->cursor->byte) {
goto lp;
}
if (w->t->curwin != curpos->w) {
w->t->curwin = curpos->w;
if (w->t->curwin->y == -1) {
wfit(w->t);
}
}
w = w->t->curwin;
bw = (BW *) w->object;
if (bw->cursor->byte != curpos->p->byte) {
pset(bw->cursor, curpos->p);
}
return 0;
} else {
return -1;
}
}
int uprevpos(BW *bw)
{
W *w = bw->parent;
lp:
if (curpos->link.prev != &pos) {
curpos = curpos->link.prev;
if (!curpos->p || !curpos->w) {
goto lp;
}
if (w->t->curwin == curpos->w && curpos->p->byte == ((BW *) w->t->curwin->object)->cursor->byte) {
goto lp;
}
if (w->t->curwin != curpos->w) {
w->t->curwin = curpos->w;
if (w->t->curwin->y == -1) {
wfit(w->t);
}
}
w = w->t->curwin;
bw = (BW *) w->object;
if (bw->cursor->byte != curpos->p->byte) {
pset(bw->cursor, curpos->p);
}
return 0;
} else {
return -1;
}
}
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