ref: 2aec1f8a09ae0bc9fb269d84ef53defebc47eede
dir: /sys/src/cmd/acme/util.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <fcall.h>
#include <plumb.h>
#include "dat.h"
#include "fns.h"
static Point prevmouse;
static Window *mousew;
void
cvttorunes(char *p, int n, Rune *r, int *nb, int *nr, int *nulls)
{
uchar *q;
Rune *s;
int j, w;
/*
* Always guaranteed that n bytes may be interpreted
* without worrying about partial runes. This may mean
* reading up to UTFmax-1 more bytes than n; the caller
* knows this. If n is a firm limit, the caller should
* set p[n] = 0.
*/
q = (uchar*)p;
s = r;
for(j=0; j<n; j+=w){
if(*q < Runeself){
w = 1;
*s = *q++;
}else{
w = chartorune(s, (char*)q);
q += w;
}
if(*s)
s++;
else if(nulls)
*nulls = TRUE;
}
*nb = (char*)q-p;
*nr = s-r;
}
void
error(char *s)
{
fprint(2, "acme: %s: %r\n", s);
remove(acmeerrorfile);
abort();
}
Window*
errorwin1(Rune *dir, int ndir, Rune **incl, int nincl)
{
Window *w;
Rune *r;
int i, n;
r = runemalloc(ndir+8);
if(n = ndir){ /* assign = */
runemove(r, dir, ndir);
r[n++] = L'/';
}
runemove(r+n, L"+Errors", 7);
n += 7;
w = lookfile(r, n);
if(w == nil){
if(row.ncol == 0)
if(rowadd(&row, nil, -1) == nil)
error("can't create column to make error window");
w = coladd(row.col[row.ncol-1], nil, nil, -1);
w->filemenu = FALSE;
winsetname(w, r, n);
}
free(r);
for(i=nincl; --i>=0; ){
n = runestrlen(incl[i]);
r = runemalloc(n);
runemove(r, incl[i], n);
winaddincl(w, r, n);
}
for(i=0; i<NINDENT; i++)
w->indent[i] = globalindent[i];
return w;
}
/* make new window, if necessary; return with it locked */
Window*
errorwin(Mntdir *md, int owner)
{
Window *w;
for(;;){
if(md == nil)
w = errorwin1(nil, 0, nil, 0);
else
w = errorwin1(md->dir, md->ndir, md->incl, md->nincl);
winlock(w, owner);
if(w->col != nil)
break;
/* window was deleted too fast */
winunlock(w);
}
return w;
}
/*
* Incoming window should be locked.
* It will be unlocked and returned window
* will be locked in its place.
*/
Window*
errorwinforwin(Window *w)
{
int i, n, nincl, owner;
Rune **incl;
Runestr dir;
Text *t;
t = &w->body;
dir = dirname(t, nil, 0);
if(dir.nr==1 && dir.r[0]=='.'){ /* sigh */
free(dir.r);
dir.r = nil;
dir.nr = 0;
}
incl = nil;
nincl = w->nincl;
if(nincl > 0){
incl = emalloc(nincl*sizeof(Rune*));
for(i=0; i<nincl; i++){
n = runestrlen(w->incl[i]);
incl[i] = runemalloc(n+1);
runemove(incl[i], w->incl[i], n);
}
}
owner = w->owner;
winunlock(w);
for(;;){
w = errorwin1(dir.r, dir.nr, incl, nincl);
winlock(w, owner);
if(w->col != nil)
break;
/* window deleted too fast */
winunlock(w);
}
return w;
}
typedef struct Warning Warning;
struct Warning{
Mntdir *md;
Buffer buf;
Warning *next;
};
static Warning *warnings;
static
void
addwarningtext(Mntdir *md, Rune *r, int nr)
{
Warning *warn;
for(warn = warnings; warn; warn=warn->next){
if(warn->md == md){
bufinsert(&warn->buf, warn->buf.nc, r, nr);
return;
}
}
warn = emalloc(sizeof(Warning));
warn->next = warnings;
warn->md = md;
if(md)
fsysincid(md);
warnings = warn;
bufinsert(&warn->buf, 0, r, nr);
nbsendp(cwarn, 0);
}
/* called while row is locked */
void
flushwarnings(void)
{
Warning *warn, *next;
Window *w;
Text *t;
int owner, nr, q0, n;
Rune *r;
for(warn=warnings; warn; warn=next) {
w = errorwin(warn->md, 'E');
t = &w->body;
owner = w->owner;
if(owner == 0)
w->owner = 'E';
wincommit(w, t);
/*
* Most commands don't generate much output. For instance,
* Edit ,>cat goes through /dev/cons and is already in blocks
* because of the i/o system, but a few can. Edit ,p will
* put the entire result into a single hunk. So it's worth doing
* this in blocks (and putting the text in a buffer in the first
* place), to avoid a big memory footprint.
*/
r = fbufalloc();
q0 = t->file->nc;
for(n = 0; n < warn->buf.nc; n += nr){
nr = warn->buf.nc - n;
if(nr > RBUFSIZE)
nr = RBUFSIZE;
bufread(&warn->buf, n, r, nr);
textbsinsert(t, t->file->nc, r, nr, TRUE, &nr);
}
textshow(t, q0, t->file->nc, 1);
free(r);
winsettag(t->w);
textscrdraw(t);
w->owner = owner;
w->dirty = FALSE;
winunlock(w);
bufclose(&warn->buf);
next = warn->next;
if(warn->md)
fsysdelid(warn->md);
free(warn);
}
warnings = nil;
}
void
warning(Mntdir *md, char *s, ...)
{
Rune *r;
va_list arg;
va_start(arg, s);
r = runevsmprint(s, arg);
va_end(arg);
if(r == nil)
error("runevsmprint failed");
addwarningtext(md, r, runestrlen(r));
free(r);
}
int
runeeq(Rune *s1, uint n1, Rune *s2, uint n2)
{
if(n1 != n2)
return FALSE;
return memcmp(s1, s2, n1*sizeof(Rune)) == 0;
}
uint
min(uint a, uint b)
{
if(a < b)
return a;
return b;
}
uint
max(uint a, uint b)
{
if(a > b)
return a;
return b;
}
char*
runetobyte(Rune *r, int n)
{
char *s;
if(r == nil)
return nil;
s = emalloc(n*UTFmax+1);
setmalloctag(s, getcallerpc(&r));
snprint(s, n*UTFmax+1, "%.*S", n, r);
return s;
}
Rune*
bytetorune(char *s, int *ip)
{
Rune *r;
int nb, nr;
nb = strlen(s);
r = runemalloc(nb+1);
cvttorunes(s, nb, r, &nb, &nr, nil);
r[nr] = '\0';
*ip = nr;
return r;
}
int
isalnum(Rune c)
{
/*
* Hard to get absolutely right. Use what we know about ASCII
* and assume anything above the Latin control characters is
* potentially an alphanumeric.
*
* Treat 0xA0 (non-breaking space) as a special alphanumeric
* character [sape]
*/
if(c <= ' ')
return FALSE;
if(0x7F<=c && c<0xA0)
return FALSE;
if(utfrune("!\"#$%&'()*+,-./:;<=>?@[\\]^`{|}~", c))
return FALSE;
return TRUE;
}
int
rgetc(void *v, uint n)
{
return ((Rune*)v)[n];
}
int
tgetc(void *a, uint n)
{
Text *t;
t = a;
if(n >= t->file->nc)
return 0;
return textreadc(t, n);
}
Rune*
skipbl(Rune *r, int n, int *np)
{
while(n>0 && (*r==' ' || *r=='\t' || *r=='\n')){
--n;
r++;
}
*np = n;
return r;
}
Rune*
findbl(Rune *r, int n, int *np)
{
while(n>0 && *r!=' ' && *r!='\t' && *r!='\n'){
--n;
r++;
}
*np = n;
return r;
}
void
savemouse(Window *w)
{
prevmouse = mouse->xy;
mousew = w;
}
void
restoremouse(Window *w)
{
if(mousew!=nil && mousew==w)
moveto(mousectl, prevmouse);
mousew = nil;
}
void
clearmouse()
{
mousew = nil;
}
char*
estrdup(char *s)
{
char *t;
t = strdup(s);
if(t == nil)
error("strdup failed");
setmalloctag(t, getcallerpc(&s));
return t;
}
void*
emalloc(uint n)
{
void *p;
p = malloc(n);
if(p == nil)
error("malloc failed");
setmalloctag(p, getcallerpc(&n));
memset(p, 0, n);
return p;
}
void*
erealloc(void *p, uint n)
{
p = realloc(p, n);
if(p == nil)
error("realloc failed");
setmalloctag(p, getcallerpc(&n));
return p;
}
/*
* Heuristic city.
*/
Window*
makenewwindow(Text *t)
{
Column *c;
Window *w, *bigw, *emptyw;
Text *emptyb;
int i, y, el;
if(activecol)
c = activecol;
else if(seltext && seltext->col)
c = seltext->col;
else if(t && t->col)
c = t->col;
else{
if(row.ncol==0 && rowadd(&row, nil, -1)==nil)
error("can't make column");
c = row.col[row.ncol-1];
}
activecol = c;
if(t==nil || t->w==nil || c->nw==0)
return coladd(c, nil, nil, -1);
/* find biggest window and biggest blank spot */
emptyw = c->w[0];
bigw = emptyw;
for(i=1; i<c->nw; i++){
w = c->w[i];
/* use >= to choose one near bottom of screen */
if(w->body.maxlines >= bigw->body.maxlines)
bigw = w;
if(w->body.maxlines-w->body.nlines >= emptyw->body.maxlines-emptyw->body.nlines)
emptyw = w;
}
emptyb = &emptyw->body;
el = emptyb->maxlines-emptyb->nlines;
/* if empty space is big, use it */
if(el>15 || (el>3 && el>(bigw->body.maxlines-1)/2))
y = emptyb->r.min.y+emptyb->nlines*font->height;
else{
/* if this window is in column and isn't much smaller, split it */
if(t->col==c && Dy(t->w->r)>2*Dy(bigw->r)/3)
bigw = t->w;
y = (bigw->r.min.y + bigw->r.max.y)/2;
}
w = coladd(c, nil, nil, y);
if(w->body.maxlines < 2)
colgrow(w->col, w, 1);
return w;
}