void
filedelete(File *f, uint p0, uint p1)
{
if(!(p0<=p1 && p0<=f->b.nc && p1<=f->b.nc))
error("internal error: filedelete");
if(f->seq > 0)
fileundelete(f, &f->delta, p0, p1);
bufdelete(&f->b, p0, p1);
if(p1 > p0)
f->mod = TRUE;
}
void
fileundo(File *f, int isundo, uint *q0p, uint *q1p)
{
Undo u;
Rune *buf;
uint i, j, n, up;
uint stop;
Buffer *delta, *epsilon;
if(isundo){
/* undo; reverse delta onto epsilon, seq decreases */
delta = &f->delta;
epsilon = &f->epsilon;
stop = f->seq;
}else{
/* redo; reverse epsilon onto delta, seq increases */
delta = &f->epsilon;
epsilon = &f->delta;
stop = 0; /* don't know yet */
}
buf = fbufalloc();
while(delta->nc > 0){
up = delta->nc-Undosize;
bufread(delta, up, (Rune*)&u, Undosize);
if(isundo){
if(u.seq < stop){
f->seq = u.seq;
goto Return;
}
}else{
if(stop == 0)
stop = u.seq;
if(u.seq > stop)
goto Return;
}
switch(u.type){
default:
fprint(2, "undo: 0x%ux\n", u.type);
abort();
break;
case Delete:
f->seq = u.seq;
fileundelete(f, epsilon, u.p0, u.p0+u.n);
f->mod = u.mod;
bufdelete(&f->b, u.p0, u.p0+u.n);
for(j=0; j<f->ntext; j++)
textdelete(f->text[j], u.p0, u.p0+u.n, FALSE);
*q0p = u.p0;
*q1p = u.p0;
break;
case Insert:
f->seq = u.seq;
fileuninsert(f, epsilon, u.p0, u.n);
f->mod = u.mod;
up -= u.n;
for(i=0; i<u.n; i+=n){
n = u.n - i;
if(n > RBUFSIZE)
n = RBUFSIZE;
bufread(delta, up+i, buf, n);
bufinsert(&f->b, u.p0+i, buf, n);
for(j=0; j<f->ntext; j++)
textinsert(f->text[j], u.p0+i, buf, n, FALSE);
}
*q0p = u.p0;
*q1p = u.p0+u.n;
break;
case Filename:
f->seq = u.seq;
fileunsetname(f, epsilon);
f->mod = u.mod;
up -= u.n;
free(f->name);
if(u.n == 0)
f->name = nil;
else
f->name = runemalloc(u.n);
bufread(delta, up, f->name, u.n);
f->nname = u.n;
break;
}
bufdelete(delta, up, delta->nc);
}
if(isundo)
f->seq = 0;
Return:
fbuffree(buf);
}
void
fileundo(File *f, int isundo, int canredo, uint *q0p, uint *q1p, int flag)
{
Undo u;
Rune *buf;
uint i, n, up;
uint stop;
Buffer *delta, *epsilon;
if(isundo){
/* undo; reverse delta onto epsilon, seq decreases */
delta = &f->delta;
epsilon = &f->epsilon;
stop = f->seq;
}else{
/* redo; reverse epsilon onto delta, seq increases */
delta = &f->epsilon;
epsilon = &f->delta;
stop = 0; /* don't know yet */
}
raspstart(f);
while(delta->nc > 0){
/* rasp and buffer are in sync; sync with wire if needed */
if(needoutflush())
raspflush(f);
up = delta->nc-Undosize;
bufread(delta, up, (Rune*)&u, Undosize);
if(isundo){
if(u.seq < stop){
f->seq = u.seq;
raspdone(f, flag);
return;
}
}else{
if(stop == 0)
stop = u.seq;
if(u.seq > stop){
raspdone(f, flag);
return;
}
}
switch(u.type){
default:
panic("undo unknown u.type");
break;
case Delete:
f->seq = u.seq;
if(canredo)
fileundelete(f, epsilon, u.p0, u.p0+u.n);
f->mod = u.mod;
bufdelete(&f->Buffer, u.p0, u.p0+u.n);
raspdelete(f, u.p0, u.p0+u.n, flag);
*q0p = u.p0;
*q1p = u.p0;
break;
case Insert:
f->seq = u.seq;
if(canredo)
fileuninsert(f, epsilon, u.p0, u.n);
f->mod = u.mod;
up -= u.n;
buf = fbufalloc();
for(i=0; i<u.n; i+=n){
n = u.n - i;
if(n > RBUFSIZE)
n = RBUFSIZE;
bufread(delta, up+i, buf, n);
bufinsert(&f->Buffer, u.p0+i, buf, n);
raspinsert(f, u.p0+i, buf, n, flag);
}
fbuffree(buf);
*q0p = u.p0;
*q1p = u.p0+u.n;
break;
case Filename:
f->seq = u.seq;
if(canredo)
fileunsetname(f, epsilon);
f->mod = u.mod;
up -= u.n;
Strinsure(&f->name, u.n+1);
bufread(delta, up, f->name.s, u.n);
f->name.s[u.n] = 0;
f->name.n = u.n;
fixname(&f->name);
sortname(f);
break;
case Dot:
f->seq = u.seq;
if(canredo)
fileunsetdot(f, epsilon, f->dot.r);
f->mod = u.mod;
f->dot.r.p1 = u.p0;
f->dot.r.p2 = u.p0 + u.n;
break;
case Mark:
f->seq = u.seq;
if(canredo)
fileunsetmark(f, epsilon, f->mark);
f->mod = u.mod;
f->mark.p1 = u.p0;
f->mark.p2 = u.p0 + u.n;
break;
}
bufdelete(delta, up, delta->nc);
}
if(isundo)
f->seq = 0;
raspdone(f, flag);
}
