ttext.c - plan9port - [fork] Plan 9 from user space
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ttext.c (33763B)
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1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <thread.h>
5 #include <cursor.h>
6 #include <mouse.h>
7 #include <keyboard.h>
8 #include <frame.h>
9 #include <fcall.h>
10 #include <plumb.h>
11 #include <libsec.h>
12 #include <complete.h>
13 #include "dat.h"
14 #include "fns.h"
15
16 Image *tagcols[NCOL];
17 Image *textcols[NCOL];
18 static Rune Ldot[] = { '.', 0 };
19
20 enum{
21 TABDIR = 3 /* width of tabs in directory windows */
22 };
23
24 void
25 textinit(Text *t, File *f, Rectangle r, Reffont *rf, Image *cols[NCOL])
26 {
27 t->file = f;
28 t->all = r;
29 t->scrollr = r;
30 t->scrollr.max.x = r.min.x+Scrollwid;
31 t->lastsr = nullrect;
32 r.min.x += Scrollwid+Scrollgap;
33 t->eq0 = ~0;
34 t->ncache = 0;
35 t->reffont = rf;
36 t->tabstop = maxtab;
37 memmove(t->fr.cols, cols, sizeof t->fr.cols);
38 textredraw(t, r, rf->f, screen, -1);
39 }
40
41 void
42 textredraw(Text *t, Rectangle r, Font *f, Image *b, int odx)
43 {
44 int maxt;
45 Rectangle rr;
46
47 frinit(&t->fr, r, f, b, t->fr.cols);
48 rr = t->fr.r;
49 rr.min.x -= Scrollwid+Scrollgap; /* back fill to scroll bar */
50 if(!t->fr.noredraw)
51 draw(t->fr.b, rr, t->fr.cols[BACK], nil, ZP);
52 /* use no wider than 3-space tabs in a directory */
53 maxt = maxtab;
54 if(t->what == Body){
55 if(t->w->isdir)
56 maxt = min(TABDIR, maxtab);
57 else
58 maxt = t->tabstop;
59 }
60 t->fr.maxtab = maxt*stringwidth(f, "0");
61 if(t->what==Body && t->w->isdir && odx!=Dx(t->all)){
62 if(t->fr.maxlines > 0){
63 textreset(t);
64 textcolumnate(t, t->w->dlp, t->w->ndl);
65 textshow(t, 0, 0, 1);
66 }
67 }else{
68 textfill(t);
69 textsetselect(t, t->q0, t->q1);
70 }
71 }
72
73 int
74 textresize(Text *t, Rectangle r, int keepextra)
75 {
76 int odx;
77
78 if(Dy(r) <= 0)
79 r.max.y = r.min.y;
80 else if(!keepextra)
81 r.max.y -= Dy(r)%t->fr.font->height;
82 odx = Dx(t->all);
83 t->all = r;
84 t->scrollr = r;
85 t->scrollr.max.x = r.min.x+Scrollwid;
86 t->lastsr = nullrect;
87 r.min.x += Scrollwid+Scrollgap;
88 frclear(&t->fr, 0);
89 textredraw(t, r, t->fr.font, t->fr.b, odx);
90 if(keepextra && t->fr.r.max.y < t->all.max.y && !t->fr.noredraw){
91 /* draw background in bottom fringe of window */
92 r.min.x -= Scrollgap;
93 r.min.y = t->fr.r.max.y;
94 r.max.y = t->all.max.y;
95 draw(screen, r, t->fr.cols[BACK], nil, ZP);
96 }
97 return t->all.max.y;
98 }
99
100 void
101 textclose(Text *t)
102 {
103 free(t->cache);
104 frclear(&t->fr, 1);
105 filedeltext(t->file, t);
106 t->file = nil;
107 rfclose(t->reffont);
108 if(argtext == t)
109 argtext = nil;
110 if(typetext == t)
111 typetext = nil;
112 if(seltext == t)
113 seltext = nil;
114 if(mousetext == t)
115 mousetext = nil;
116 if(barttext == t)
117 barttext = nil;
118 }
119
120 int
121 dircmp(const void *a, const void *b)
122 {
123 Dirlist *da, *db;
124 int i, n;
125
126 da = *(Dirlist**)a;
127 db = *(Dirlist**)b;
128 n = min(da->nr, db->nr);
129 i = memcmp(da->r, db->r, n*sizeof(Rune));
130 if(i)
131 return i;
132 return da->nr - db->nr;
133 }
134
135 void
136 textcolumnate(Text *t, Dirlist **dlp, int ndl)
137 {
138 int i, j, w, colw, mint, maxt, ncol, nrow;
139 Dirlist *dl;
140 uint q1;
141 static Rune Lnl[] = { '\n', 0 };
142 static Rune Ltab[] = { '\t', 0 };
143
144 if(t->file->ntext > 1)
145 return;
146 mint = stringwidth(t->fr.font, "0");
147 /* go for narrower tabs if set more than 3 wide */
148 t->fr.maxtab = min(maxtab, TABDIR)*mint;
149 maxt = t->fr.maxtab;
150 colw = 0;
151 for(i=0; i<ndl; i++){
152 dl = dlp[i];
153 w = dl->wid;
154 if(maxt-w%maxt < mint || w%maxt==0)
155 w += mint;
156 if(w % maxt)
157 w += maxt-(w%maxt);
158 if(w > colw)
159 colw = w;
160 }
161 if(colw == 0)
162 ncol = 1;
163 else
164 ncol = max(1, Dx(t->fr.r)/colw);
165 nrow = (ndl+ncol-1)/ncol;
166
167 q1 = 0;
168 for(i=0; i<nrow; i++){
169 for(j=i; j<ndl; j+=nrow){
170 dl = dlp[j];
171 fileinsert(t->file, q1, dl->r, dl->nr);
172 q1 += dl->nr;
173 if(j+nrow >= ndl)
174 break;
175 w = dl->wid;
176 if(maxt-w%maxt < mint){
177 fileinsert(t->file, q1, Ltab, 1);
178 q1++;
179 w += mint;
180 }
181 do{
182 fileinsert(t->file, q1, Ltab, 1);
183 q1++;
184 w += maxt-(w%maxt);
185 }while(w < colw);
186 }
187 fileinsert(t->file, q1, Lnl, 1);
188 q1++;
189 }
190 }
191
192 int
193 textload(Text *t, uint q0, char *file, int setqid)
194 {
195 Rune *rp;
196 Dirlist *dl, **dlp;
197 int fd, i, j, n, ndl, nulls;
198 uint q, q1;
199 Dir *d, *dbuf;
200 char *tmp;
201 Text *u;
202 DigestState *h;
203
204 if(t->ncache!=0 || t->file->b.nc || t->w==nil || t!=&t->w->body)
205 error("text.load");
206 if(t->w->isdir && t->file->nname==0){
207 warning(nil, "empty directory name");
208 return -1;
209 }
210 if(ismtpt(file)){
211 warning(nil, "will not open self mount point %s\n", file);
212 return -1;
213 }
214 fd = open(file, OREAD);
215 if(fd < 0){
216 warning(nil, "can't open %s: %r\n", file);
217 return -1;
218 }
219 d = dirfstat(fd);
220 if(d == nil){
221 warning(nil, "can't fstat %s: %r\n", file);
222 goto Rescue;
223 }
224 nulls = FALSE;
225 h = nil;
226 if(d->qid.type & QTDIR){
227 /* this is checked in get() but it's possible the file changed underfoot */
228 if(t->file->ntext > 1){
229 warning(nil, "%s is a directory; can't read with multiple windows on it\n", file);
230 goto Rescue;
231 }
232 t->w->isdir = TRUE;
233 t->w->filemenu = FALSE;
234 if(t->file->nname > 0 && t->file->name[t->file->nname-1] != '/'){
235 rp = runemalloc(t->file->nname+1);
236 runemove(rp, t->file->name, t->file->nname);
237 rp[t->file->nname] = '/';
238 winsetname(t->w, rp, t->file->nname+1);
239 free(rp);
240 }
241 dlp = nil;
242 ndl = 0;
243 dbuf = nil;
244 while((n=dirread(fd, &dbuf)) > 0){
245 for(i=0; i<n; i++){
246 dl = emalloc(sizeof(Dirlist));
247 j = strlen(dbuf[i].name);
248 tmp = emalloc(j+1+1);
249 memmove(tmp, dbuf[i].name, j);
250 if(dbuf[i].qid.type & QTDIR)
251 tmp[j++] = '/';
252 tmp[j] = '\0';
253 dl->r = bytetorune(tmp, &dl->nr);
254 dl->wid = stringwidth(t->fr.font, tmp);
255 free(tmp);
256 ndl++;
257 dlp = realloc(dlp, ndl*sizeof(Dirlist*));
258 dlp[ndl-1] = dl;
259 }
260 free(dbuf);
261 }
262 qsort(dlp, ndl, sizeof(Dirlist*), dircmp);
263 t->w->dlp = dlp;
264 t->w->ndl = ndl;
265 textcolumnate(t, dlp, ndl);
266 q1 = t->file->b.nc;
267 }else{
268 t->w->isdir = FALSE;
269 t->w->filemenu = TRUE;
270 if(q0 == 0)
271 h = sha1(nil, 0, nil, nil);
272 q1 = q0 + fileload(t->file, q0, fd, &nulls, h);
273 }
274 if(setqid){
275 if(h != nil) {
276 sha1(nil, 0, t->file->sha1, h);
277 h = nil;
278 } else {
279 memset(t->file->sha1, 0, sizeof t->file->sha1);
280 }
281 t->file->dev = d->dev;
282 t->file->mtime = d->mtime;
283 t->file->qidpath = d->qid.path;
284 }
285 close(fd);
286 rp = fbufalloc();
287 for(q=q0; q<q1; q+=n){
288 n = q1-q;
289 if(n > RBUFSIZE)
290 n = RBUFSIZE;
291 bufread(&t->file->b, q, rp, n);
292 if(q < t->org)
293 t->org += n;
294 else if(q <= t->org+t->fr.nchars)
295 frinsert(&t->fr, rp, rp+n, q-t->org);
296 if(t->fr.lastlinefull)
297 break;
298 }
299 fbuffree(rp);
300 for(i=0; i<t->file->ntext; i++){
301 u = t->file->text[i];
302 if(u != t){
303 if(u->org > u->file->b.nc) /* will be 0 because of reset(), but safety first */
304 u->org = 0;
305 textresize(u, u->all, TRUE);
306 textbacknl(u, u->org, 0); /* go to beginning of line */
307 }
308 textsetselect(u, q0, q0);
309 }
310 if(nulls)
311 warning(nil, "%s: NUL bytes elided\n", file);
312 free(d);
313 return q1-q0;
314
315 Rescue:
316 close(fd);
317 return -1;
318 }
319
320 uint
321 textbsinsert(Text *t, uint q0, Rune *r, uint n, int tofile, int *nrp)
322 {
323 Rune *bp, *tp, *up;
324 int i, initial;
325
326 if(t->what == Tag){ /* can't happen but safety first: mustn't backspace over file name */
327 Err:
328 textinsert(t, q0, r, n, tofile);
329 *nrp = n;
330 return q0;
331 }
332 bp = r;
333 for(i=0; i<n; i++)
334 if(*bp++ == '\b'){
335 --bp;
336 initial = 0;
337 tp = runemalloc(n);
338 runemove(tp, r, i);
339 up = tp+i;
340 for(; i<n; i++){
341 *up = *bp++;
342 if(*up == '\b')
343 if(up == tp)
344 initial++;
345 else
346 --up;
347 else
348 up++;
349 }
350 if(initial){
351 if(initial > q0)
352 initial = q0;
353 q0 -= initial;
354 textdelete(t, q0, q0+initial, tofile);
355 }
356 n = up-tp;
357 textinsert(t, q0, tp, n, tofile);
358 free(tp);
359 *nrp = n;
360 return q0;
361 }
362 goto Err;
363 }
364
365 void
366 textinsert(Text *t, uint q0, Rune *r, uint n, int tofile)
367 {
368 int c, i;
369 Text *u;
370
371 if(tofile && t->ncache != 0)
372 error("text.insert");
373 if(n == 0)
374 return;
375 if(tofile){
376 fileinsert(t->file, q0, r, n);
377 if(t->what == Body){
378 t->w->dirty = TRUE;
379 t->w->utflastqid = -1;
380 }
381 if(t->file->ntext > 1)
382 for(i=0; i<t->file->ntext; i++){
383 u = t->file->text[i];
384 if(u != t){
385 u->w->dirty = TRUE; /* always a body */
386 textinsert(u, q0, r, n, FALSE);
387 textsetselect(u, u->q0, u->q1);
388 textscrdraw(u);
389 }
390 }
391
392 }
393 if(q0 < t->iq1)
394 t->iq1 += n;
395 if(q0 < t->q1)
396 t->q1 += n;
397 if(q0 < t->q0)
398 t->q0 += n;
399 if(q0 < t->org)
400 t->org += n;
401 else if(q0 <= t->org+t->fr.nchars)
402 frinsert(&t->fr, r, r+n, q0-t->org);
403 if(t->w){
404 c = 'i';
405 if(t->what == Body)
406 c = 'I';
407 if(n <= EVENTSIZE)
408 winevent(t->w, "%c%d %d 0 %d %.*S\n", c, q0, q0+n, n, n, r);
409 else
410 winevent(t->w, "%c%d %d 0 0 \n", c, q0, q0+n, n);
411 }
412 }
413
414 void
415 typecommit(Text *t)
416 {
417 if(t->w != nil)
418 wincommit(t->w, t);
419 else
420 textcommit(t, TRUE);
421 }
422
423 void
424 textfill(Text *t)
425 {
426 Rune *rp;
427 int i, n, m, nl;
428
429 if(t->fr.lastlinefull || t->nofill)
430 return;
431 if(t->ncache > 0)
432 typecommit(t);
433 rp = fbufalloc();
434 do{
435 n = t->file->b.nc-(t->org+t->fr.nchars);
436 if(n == 0)
437 break;
438 if(n > 2000) /* educated guess at reasonable amount */
439 n = 2000;
440 bufread(&t->file->b, t->org+t->fr.nchars, rp, n);
441 /*
442 * it's expensive to frinsert more than we need, so
443 * count newlines.
444 */
445 nl = t->fr.maxlines-t->fr.nlines;
446 m = 0;
447 for(i=0; i<n; ){
448 if(rp[i++] == '\n'){
449 m++;
450 if(m >= nl)
451 break;
452 }
453 }
454 frinsert(&t->fr, rp, rp+i, t->fr.nchars);
455 }while(t->fr.lastlinefull == FALSE);
456 fbuffree(rp);
457 }
458
459 void
460 textdelete(Text *t, uint q0, uint q1, int tofile)
461 {
462 uint n, p0, p1;
463 int i, c;
464 Text *u;
465
466 if(tofile && t->ncache != 0)
467 error("text.delete");
468 n = q1-q0;
469 if(n == 0)
470 return;
471 if(tofile){
472 filedelete(t->file, q0, q1);
473 if(t->what == Body){
474 t->w->dirty = TRUE;
475 t->w->utflastqid = -1;
476 }
477 if(t->file->ntext > 1)
478 for(i=0; i<t->file->ntext; i++){
479 u = t->file->text[i];
480 if(u != t){
481 u->w->dirty = TRUE; /* always a body */
482 textdelete(u, q0, q1, FALSE);
483 textsetselect(u, u->q0, u->q1);
484 textscrdraw(u);
485 }
486 }
487 }
488 if(q0 < t->iq1)
489 t->iq1 -= min(n, t->iq1-q0);
490 if(q0 < t->q0)
491 t->q0 -= min(n, t->q0-q0);
492 if(q0 < t->q1)
493 t->q1 -= min(n, t->q1-q0);
494 if(q1 <= t->org)
495 t->org -= n;
496 else if(q0 < t->org+t->fr.nchars){
497 p1 = q1 - t->org;
498 if(p1 > t->fr.nchars)
499 p1 = t->fr.nchars;
500 if(q0 < t->org){
501 t->org = q0;
502 p0 = 0;
503 }else
504 p0 = q0 - t->org;
505 frdelete(&t->fr, p0, p1);
506 textfill(t);
507 }
508 if(t->w){
509 c = 'd';
510 if(t->what == Body)
511 c = 'D';
512 winevent(t->w, "%c%d %d 0 0 \n", c, q0, q1);
513 }
514 }
515
516 void
517 textconstrain(Text *t, uint q0, uint q1, uint *p0, uint *p1)
518 {
519 *p0 = min(q0, t->file->b.nc);
520 *p1 = min(q1, t->file->b.nc);
521 }
522
523 Rune
524 textreadc(Text *t, uint q)
525 {
526 Rune r;
527
528 if(t->cq0<=q && q<t->cq0+t->ncache)
529 r = t->cache[q-t->cq0];
530 else
531 bufread(&t->file->b, q, &r, 1);
532 return r;
533 }
534
535 int
536 textbswidth(Text *t, Rune c)
537 {
538 uint q, eq;
539 Rune r;
540 int skipping;
541
542 /* there is known to be at least one character to erase */
543 if(c == 0x08) /* ^H: erase character */
544 return 1;
545 q = t->q0;
546 skipping = TRUE;
547 while(q > 0){
548 r = textreadc(t, q-1);
549 if(r == '\n'){ /* eat at most one more character */
550 if(q == t->q0) /* eat the newline */
551 --q;
552 break;
553 }
554 if(c == 0x17){
555 eq = isalnum(r);
556 if(eq && skipping) /* found one; stop skipping */
557 skipping = FALSE;
558 else if(!eq && !skipping)
559 break;
560 }
561 --q;
562 }
563 return t->q0-q;
564 }
565
566 int
567 textfilewidth(Text *t, uint q0, int oneelement)
568 {
569 uint q;
570 Rune r;
571
572 q = q0;
573 while(q > 0){
574 r = textreadc(t, q-1);
575 if(r <= ' ')
576 break;
577 if(oneelement && r=='/')
578 break;
579 --q;
580 }
581 return q0-q;
582 }
583
584 Rune*
585 textcomplete(Text *t)
586 {
587 int i, nstr, npath;
588 uint q;
589 Rune tmp[200];
590 Rune *str, *path;
591 Rune *rp;
592 Completion *c;
593 char *s, *dirs;
594 Runestr dir;
595
596 /* control-f: filename completion; works back to white space or / */
597 if(t->q0<t->file->b.nc && textreadc(t, t->q0)>' ') /* must be at end of word */
598 return nil;
599 nstr = textfilewidth(t, t->q0, TRUE);
600 str = runemalloc(nstr);
601 npath = textfilewidth(t, t->q0-nstr, FALSE);
602 path = runemalloc(npath);
603
604 c = nil;
605 rp = nil;
606 dirs = nil;
607
608 q = t->q0-nstr;
609 for(i=0; i<nstr; i++)
610 str[i] = textreadc(t, q++);
611 q = t->q0-nstr-npath;
612 for(i=0; i<npath; i++)
613 path[i] = textreadc(t, q++);
614 /* is path rooted? if not, we need to make it relative to window path */
615 if(npath>0 && path[0]=='/')
616 dir = runestr(path, npath);
617 else{
618 dir = dirname(t, nil, 0);
619 if(dir.nr + 1 + npath > nelem(tmp)){
620 free(dir.r);
621 goto Return;
622 }
623 if(dir.nr == 0){
624 dir.nr = 1;
625 dir.r = runestrdup(Ldot);
626 }
627 runemove(tmp, dir.r, dir.nr);
628 tmp[dir.nr] = '/';
629 runemove(tmp+dir.nr+1, path, npath);
630 free(dir.r);
631 dir.r = tmp;
632 dir.nr += 1+npath;
633 dir = cleanrname(dir);
634 }
635
636 s = smprint("%.*S", nstr, str);
637 dirs = smprint("%.*S", dir.nr, dir.r);
638 c = complete(dirs, s);
639 free(s);
640 if(c == nil){
641 warning(nil, "error attempting completion: %r\n");
642 goto Return;
643 }
644
645 if(!c->advance){
646 warning(nil, "%.*S%s%.*S*%s\n",
647 dir.nr, dir.r,
648 dir.nr>0 && dir.r[dir.nr-1]!='/' ? "/" : "",
649 nstr, str,
650 c->nmatch ? "" : ": no matches in:");
651 for(i=0; i<c->nfile; i++)
652 warning(nil, " %s\n", c->filename[i]);
653 }
654
655 if(c->advance)
656 rp = runesmprint("%s", c->string);
657 else
658 rp = nil;
659 Return:
660 freecompletion(c);
661 free(dirs);
662 free(str);
663 free(path);
664 return rp;
665 }
666
667 void
668 texttype(Text *t, Rune r)
669 {
670 uint q0, q1;
671 int nnb, nb, n, i;
672 int nr;
673 Rune *rp;
674 Text *u;
675
676 if(t->what!=Body && t->what!=Tag && r=='\n')
677 return;
678 if(t->what == Tag)
679 t->w->tagsafe = FALSE;
680
681 nr = 1;
682 rp = &r;
683 switch(r){
684 case Kleft:
685 typecommit(t);
686 if(t->q0 > 0)
687 textshow(t, t->q0-1, t->q0-1, TRUE);
688 return;
689 case Kright:
690 typecommit(t);
691 if(t->q1 < t->file->b.nc)
692 textshow(t, t->q1+1, t->q1+1, TRUE);
693 return;
694 case Kdown:
695 if(t->what == Tag)
696 goto Tagdown;
697 n = t->fr.maxlines/3;
698 goto case_Down;
699 case Kscrollonedown:
700 if(t->what == Tag)
701 goto Tagdown;
702 n = mousescrollsize(t->fr.maxlines);
703 if(n <= 0)
704 n = 1;
705 goto case_Down;
706 case Kpgdown:
707 n = 2*t->fr.maxlines/3;
708 case_Down:
709 q0 = t->org+frcharofpt(&t->fr, Pt(t->fr.r.min.x, t->fr.r.min.y+n*t->fr.font->height));
710 textsetorigin(t, q0, TRUE);
711 return;
712 case Kup:
713 if(t->what == Tag)
714 goto Tagup;
715 n = t->fr.maxlines/3;
716 goto case_Up;
717 case Kscrolloneup:
718 if(t->what == Tag)
719 goto Tagup;
720 n = mousescrollsize(t->fr.maxlines);
721 goto case_Up;
722 case Kpgup:
723 n = 2*t->fr.maxlines/3;
724 case_Up:
725 q0 = textbacknl(t, t->org, n);
726 textsetorigin(t, q0, TRUE);
727 return;
728 case Khome:
729 typecommit(t);
730 if(t->org > t->iq1) {
731 q0 = textbacknl(t, t->iq1, 1);
732 textsetorigin(t, q0, TRUE);
733 } else
734 textshow(t, 0, 0, FALSE);
735 return;
736 case Kend:
737 typecommit(t);
738 if(t->iq1 > t->org+t->fr.nchars) {
739 if(t->iq1 > t->file->b.nc) {
740 // should not happen, but does. and it will crash textbacknl.
741 t->iq1 = t->file->b.nc;
742 }
743 q0 = textbacknl(t, t->iq1, 1);
744 textsetorigin(t, q0, TRUE);
745 } else
746 textshow(t, t->file->b.nc, t->file->b.nc, FALSE);
747 return;
748 case 0x01: /* ^A: beginning of line */
749 typecommit(t);
750 /* go to where ^U would erase, if not already at BOL */
751 nnb = 0;
752 if(t->q0>0 && textreadc(t, t->q0-1)!='\n')
753 nnb = textbswidth(t, 0x15);
754 textshow(t, t->q0-nnb, t->q0-nnb, TRUE);
755 return;
756 case 0x05: /* ^E: end of line */
757 typecommit(t);
758 q0 = t->q0;
759 while(q0<t->file->b.nc && textreadc(t, q0)!='\n')
760 q0++;
761 textshow(t, q0, q0, TRUE);
762 return;
763 case Kcmd+'c': /* %C: copy */
764 typecommit(t);
765 cut(t, t, nil, TRUE, FALSE, nil, 0);
766 return;
767 case Kcmd+'z': /* %Z: undo */
768 typecommit(t);
769 undo(t, nil, nil, TRUE, 0, nil, 0);
770 return;
771 case Kcmd+'Z': /* %-shift-Z: redo */
772 typecommit(t);
773 undo(t, nil, nil, FALSE, 0, nil, 0);
774 return;
775
776 Tagdown:
777 /* expand tag to show all text */
778 if(!t->w->tagexpand){
779 t->w->tagexpand = TRUE;
780 winresize(t->w, t->w->r, FALSE, TRUE);
781 }
782 return;
783
784 Tagup:
785 /* shrink tag to single line */
786 if(t->w->tagexpand){
787 t->w->tagexpand = FALSE;
788 t->w->taglines = 1;
789 winresize(t->w, t->w->r, FALSE, TRUE);
790 }
791 return;
792 }
793 if(t->what == Body){
794 seq++;
795 filemark(t->file);
796 }
797 /* cut/paste must be done after the seq++/filemark */
798 switch(r){
799 case Kcmd+'x': /* %X: cut */
800 typecommit(t);
801 if(t->what == Body){
802 seq++;
803 filemark(t->file);
804 }
805 cut(t, t, nil, TRUE, TRUE, nil, 0);
806 textshow(t, t->q0, t->q0, 1);
807 t->iq1 = t->q0;
808 return;
809 case Kcmd+'v': /* %V: paste */
810 typecommit(t);
811 if(t->what == Body){
812 seq++;
813 filemark(t->file);
814 }
815 paste(t, t, nil, TRUE, FALSE, nil, 0);
816 textshow(t, t->q0, t->q1, 1);
817 t->iq1 = t->q1;
818 return;
819 }
820 if(t->q1 > t->q0){
821 if(t->ncache != 0)
822 error("text.type");
823 cut(t, t, nil, TRUE, TRUE, nil, 0);
824 t->eq0 = ~0;
825 }
826 textshow(t, t->q0, t->q0, 1);
827 switch(r){
828 case 0x06: /* ^F: complete */
829 case Kins:
830 typecommit(t);
831 rp = textcomplete(t);
832 if(rp == nil)
833 return;
834 nr = runestrlen(rp);
835 break; /* fall through to normal insertion case */
836 case 0x1B:
837 if(t->eq0 != ~0) {
838 if(t->eq0 <= t->q0)
839 textsetselect(t, t->eq0, t->q0);
840 else
841 textsetselect(t, t->q0, t->eq0);
842 }
843 if(t->ncache > 0)
844 typecommit(t);
845 t->iq1 = t->q0;
846 return;
847 case 0x08: /* ^H: erase character */
848 case 0x15: /* ^U: erase line */
849 case 0x17: /* ^W: erase word */
850 if(t->q0 == 0) /* nothing to erase */
851 return;
852 nnb = textbswidth(t, r);
853 q1 = t->q0;
854 q0 = q1-nnb;
855 /* if selection is at beginning of window, avoid deleting invisible text */
856 if(q0 < t->org){
857 q0 = t->org;
858 nnb = q1-q0;
859 }
860 if(nnb <= 0)
861 return;
862 for(i=0; i<t->file->ntext; i++){
863 u = t->file->text[i];
864 u->nofill = TRUE;
865 nb = nnb;
866 n = u->ncache;
867 if(n > 0){
868 if(q1 != u->cq0+n)
869 error("text.type backspace");
870 if(n > nb)
871 n = nb;
872 u->ncache -= n;
873 textdelete(u, q1-n, q1, FALSE);
874 nb -= n;
875 }
876 if(u->eq0==q1 || u->eq0==~0)
877 u->eq0 = q0;
878 if(nb && u==t)
879 textdelete(u, q0, q0+nb, TRUE);
880 if(u != t)
881 textsetselect(u, u->q0, u->q1);
882 else
883 textsetselect(t, q0, q0);
884 u->nofill = FALSE;
885 }
886 for(i=0; i<t->file->ntext; i++)
887 textfill(t->file->text[i]);
888 t->iq1 = t->q0;
889 return;
890 case '\n':
891 if(t->w->autoindent){
892 /* find beginning of previous line using backspace code */
893 nnb = textbswidth(t, 0x15); /* ^U case */
894 rp = runemalloc(nnb + 1);
895 nr = 0;
896 rp[nr++] = r;
897 for(i=0; i<nnb; i++){
898 r = textreadc(t, t->q0-nnb+i);
899 if(r != ' ' && r != '\t')
900 break;
901 rp[nr++] = r;
902 }
903 }
904 break; /* fall through to normal code */
905 }
906 /* otherwise ordinary character; just insert, typically in caches of all texts */
907 for(i=0; i<t->file->ntext; i++){
908 u = t->file->text[i];
909 if(u->eq0 == ~0)
910 u->eq0 = t->q0;
911 if(u->ncache == 0)
912 u->cq0 = t->q0;
913 else if(t->q0 != u->cq0+u->ncache)
914 error("text.type cq1");
915 /*
916 * Change the tag before we add to ncache,
917 * so that if the window body is resized the
918 * commit will not find anything in ncache.
919 */
920 if(u->what==Body && u->ncache == 0){
921 u->needundo = TRUE;
922 winsettag(t->w);
923 u->needundo = FALSE;
924 }
925 textinsert(u, t->q0, rp, nr, FALSE);
926 if(u != t)
927 textsetselect(u, u->q0, u->q1);
928 if(u->ncache+nr > u->ncachealloc){
929 u->ncachealloc += 10 + nr;
930 u->cache = runerealloc(u->cache, u->ncachealloc);
931 }
932 runemove(u->cache+u->ncache, rp, nr);
933 u->ncache += nr;
934 }
935 if(rp != &r)
936 free(rp);
937 textsetselect(t, t->q0+nr, t->q0+nr);
938 if(r=='\n' && t->w!=nil)
939 wincommit(t->w, t);
940 t->iq1 = t->q0;
941 }
942
943 void
944 textcommit(Text *t, int tofile)
945 {
946 if(t->ncache == 0)
947 return;
948 if(tofile)
949 fileinsert(t->file, t->cq0, t->cache, t->ncache);
950 if(t->what == Body){
951 t->w->dirty = TRUE;
952 t->w->utflastqid = -1;
953 }
954 t->ncache = 0;
955 }
956
957 static Text *clicktext;
958 static uint clickmsec;
959 static Text *selecttext;
960 static uint selectq;
961
962 /*
963 * called from frame library
964 */
965 void
966 framescroll(Frame *f, int dl)
967 {
968 if(f != &selecttext->fr)
969 error("frameselect not right frame");
970 textframescroll(selecttext, dl);
971 }
972
973 void
974 textframescroll(Text *t, int dl)
975 {
976 uint q0;
977
978 if(dl == 0){
979 scrsleep(100);
980 return;
981 }
982 if(dl < 0){
983 q0 = textbacknl(t, t->org, -dl);
984 if(selectq > t->org+t->fr.p0)
985 textsetselect(t, t->org+t->fr.p0, selectq);
986 else
987 textsetselect(t, selectq, t->org+t->fr.p0);
988 }else{
989 if(t->org+t->fr.nchars == t->file->b.nc)
990 return;
991 q0 = t->org+frcharofpt(&t->fr, Pt(t->fr.r.min.x, t->fr.r.min.y+dl*t->fr.font->height));
992 if(selectq > t->org+t->fr.p1)
993 textsetselect(t, t->org+t->fr.p1, selectq);
994 else
995 textsetselect(t, selectq, t->org+t->fr.p1);
996 }
997 textsetorigin(t, q0, TRUE);
998 }
999
1000
1001 void
1002 textselect(Text *t)
1003 {
1004 uint q0, q1;
1005 int b, x, y;
1006 int state;
1007 enum { None, Cut, Paste };
1008
1009 selecttext = t;
1010 /*
1011 * To have double-clicking and chording, we double-click
1012 * immediately if it might make sense.
1013 */
1014 b = mouse->buttons;
1015 q0 = t->q0;
1016 q1 = t->q1;
1017 selectq = t->org+frcharofpt(&t->fr, mouse->xy);
1018 if(clicktext==t && mouse->msec-clickmsec<500)
1019 if(q0==q1 && selectq==q0){
1020 textdoubleclick(t, &q0, &q1);
1021 textsetselect(t, q0, q1);
1022 flushimage(display, 1);
1023 x = mouse->xy.x;
1024 y = mouse->xy.y;
1025 /* stay here until something interesting happens */
1026 do
1027 readmouse(mousectl);
1028 while(mouse->buttons==b && abs(mouse->xy.x-x)<3 && abs(mouse->xy.y-y)<3);
1029 mouse->xy.x = x; /* in case we're calling frselect */
1030 mouse->xy.y = y;
1031 q0 = t->q0; /* may have changed */
1032 q1 = t->q1;
1033 selectq = q0;
1034 }
1035 if(mouse->buttons == b){
1036 t->fr.scroll = framescroll;
1037 frselect(&t->fr, mousectl);
1038 /* horrible botch: while asleep, may have lost selection altogether */
1039 if(selectq > t->file->b.nc)
1040 selectq = t->org + t->fr.p0;
1041 t->fr.scroll = nil;
1042 if(selectq < t->org)
1043 q0 = selectq;
1044 else
1045 q0 = t->org + t->fr.p0;
1046 if(selectq > t->org+t->fr.nchars)
1047 q1 = selectq;
1048 else
1049 q1 = t->org+t->fr.p1;
1050 }
1051 if(q0 == q1){
1052 if(q0==t->q0 && clicktext==t && mouse->msec-clickmsec<500){
1053 textdoubleclick(t, &q0, &q1);
1054 clicktext = nil;
1055 }else{
1056 clicktext = t;
1057 clickmsec = mouse->msec;
1058 }
1059 }else
1060 clicktext = nil;
1061 textsetselect(t, q0, q1);
1062 flushimage(display, 1);
1063 state = None; /* what we've done; undo when possible */
1064 while(mouse->buttons){
1065 mouse->msec = 0;
1066 b = mouse->buttons;
1067 if((b&1) && (b&6)){
1068 if(state==None && t->what==Body){
1069 seq++;
1070 filemark(t->w->body.file);
1071 }
1072 if(b & 2){
1073 if(state==Paste && t->what==Body){
1074 winundo(t->w, TRUE);
1075 textsetselect(t, q0, t->q1);
1076 state = None;
1077 }else if(state != Cut){
1078 cut(t, t, nil, TRUE, TRUE, nil, 0);
1079 state = Cut;
1080 }
1081 }else{
1082 if(state==Cut && t->what==Body){
1083 winundo(t->w, TRUE);
1084 textsetselect(t, q0, t->q1);
1085 state = None;
1086 }else if(state != Paste){
1087 paste(t, t, nil, TRUE, FALSE, nil, 0);
1088 state = Paste;
1089 }
1090 }
1091 textscrdraw(t);
1092 clearmouse();
1093 }
1094 flushimage(display, 1);
1095 while(mouse->buttons == b)
1096 readmouse(mousectl);
1097 clicktext = nil;
1098 }
1099 }
1100
1101 void
1102 textshow(Text *t, uint q0, uint q1, int doselect)
1103 {
1104 int qe;
1105 int nl;
1106 int tsd;
1107 int nc;
1108 uint q;
1109
1110 if(t->what != Body){
1111 if(doselect)
1112 textsetselect(t, q0, q1);
1113 return;
1114 }
1115 if(t->w!=nil && t->fr.maxlines==0)
1116 colgrow(t->col, t->w, 1);
1117 if(doselect)
1118 textsetselect(t, q0, q1);
1119 qe = t->org+t->fr.nchars;
1120 tsd = FALSE; /* do we call textscrdraw? */
1121 nc = t->file->b.nc+t->ncache;
1122 if(t->org <= q0){
1123 if(nc==0 || q0<qe)
1124 tsd = TRUE;
1125 else if(q0==qe && qe==nc){
1126 if(textreadc(t, nc-1) == '\n'){
1127 if(t->fr.nlines<t->fr.maxlines)
1128 tsd = TRUE;
1129 }else
1130 tsd = TRUE;
1131 }
1132 }
1133 if(tsd)
1134 textscrdraw(t);
1135 else{
1136 if(t->w->nopen[QWevent] > 0)
1137 nl = 3*t->fr.maxlines/4;
1138 else
1139 nl = t->fr.maxlines/4;
1140 q = textbacknl(t, q0, nl);
1141 /* avoid going backwards if trying to go forwards - long lines! */
1142 if(!(q0>t->org && q<t->org))
1143 textsetorigin(t, q, TRUE);
1144 while(q0 > t->org+t->fr.nchars)
1145 textsetorigin(t, t->org+1, FALSE);
1146 }
1147 }
1148
1149 static
1150 int
1151 region(int a, int b)
1152 {
1153 if(a < b)
1154 return -1;
1155 if(a == b)
1156 return 0;
1157 return 1;
1158 }
1159
1160 void
1161 selrestore(Frame *f, Point pt0, uint p0, uint p1)
1162 {
1163 if(p1<=f->p0 || p0>=f->p1){
1164 /* no overlap */
1165 frdrawsel0(f, pt0, p0, p1, f->cols[BACK], f->cols[TEXT]);
1166 return;
1167 }
1168 if(p0>=f->p0 && p1<=f->p1){
1169 /* entirely inside */
1170 frdrawsel0(f, pt0, p0, p1, f->cols[HIGH], f->cols[HTEXT]);
1171 return;
1172 }
1173
1174 /* they now are known to overlap */
1175
1176 /* before selection */
1177 if(p0 < f->p0){
1178 frdrawsel0(f, pt0, p0, f->p0, f->cols[BACK], f->cols[TEXT]);
1179 p0 = f->p0;
1180 pt0 = frptofchar(f, p0);
1181 }
1182 /* after selection */
1183 if(p1 > f->p1){
1184 frdrawsel0(f, frptofchar(f, f->p1), f->p1, p1, f->cols[BACK], f->cols[TEXT]);
1185 p1 = f->p1;
1186 }
1187 /* inside selection */
1188 frdrawsel0(f, pt0, p0, p1, f->cols[HIGH], f->cols[HTEXT]);
1189 }
1190
1191 void
1192 textsetselect(Text *t, uint q0, uint q1)
1193 {
1194 int p0, p1, ticked;
1195
1196 /* t->fr.p0 and t->fr.p1 are always right; t->q0 and t->q1 may be off */
1197 t->q0 = q0;
1198 t->q1 = q1;
1199 /* compute desired p0,p1 from q0,q1 */
1200 p0 = q0-t->org;
1201 p1 = q1-t->org;
1202 ticked = 1;
1203 if(p0 < 0){
1204 ticked = 0;
1205 p0 = 0;
1206 }
1207 if(p1 < 0)
1208 p1 = 0;
1209 if(p0 > t->fr.nchars)
1210 p0 = t->fr.nchars;
1211 if(p1 > t->fr.nchars){
1212 ticked = 0;
1213 p1 = t->fr.nchars;
1214 }
1215 if(p0==t->fr.p0 && p1==t->fr.p1){
1216 if(p0 == p1 && ticked != t->fr.ticked)
1217 frtick(&t->fr, frptofchar(&t->fr, p0), ticked);
1218 return;
1219 }
1220 if(p0 > p1)
1221 sysfatal("acme: textsetselect p0=%d p1=%d q0=%ud q1=%ud t->org=%d nchars=%d", p0, p1, q0, q1, (int)t->org, (int)t->fr.nchars);
1222 /* screen disagrees with desired selection */
1223 if(t->fr.p1<=p0 || p1<=t->fr.p0 || p0==p1 || t->fr.p1==t->fr.p0){
1224 /* no overlap or too easy to bother trying */
1225 frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p0), t->fr.p0, t->fr.p1, 0);
1226 if(p0 != p1 || ticked)
1227 frdrawsel(&t->fr, frptofchar(&t->fr, p0), p0, p1, 1);
1228 goto Return;
1229 }
1230 /* overlap; avoid unnecessary painting */
1231 if(p0 < t->fr.p0){
1232 /* extend selection backwards */
1233 frdrawsel(&t->fr, frptofchar(&t->fr, p0), p0, t->fr.p0, 1);
1234 }else if(p0 > t->fr.p0){
1235 /* trim first part of selection */
1236 frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p0), t->fr.p0, p0, 0);
1237 }
1238 if(p1 > t->fr.p1){
1239 /* extend selection forwards */
1240 frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p1), t->fr.p1, p1, 1);
1241 }else if(p1 < t->fr.p1){
1242 /* trim last part of selection */
1243 frdrawsel(&t->fr, frptofchar(&t->fr, p1), p1, t->fr.p1, 0);
1244 }
1245
1246 Return:
1247 t->fr.p0 = p0;
1248 t->fr.p1 = p1;
1249 }
1250
1251 /*
1252 * Release the button in less than DELAY ms and it's considered a null selection
1253 * if the mouse hardly moved, regardless of whether it crossed a char boundary.
1254 */
1255 enum {
1256 DELAY = 2,
1257 MINMOVE = 4
1258 };
1259
1260 uint
1261 xselect(Frame *f, Mousectl *mc, Image *col, uint *p1p) /* when called, button is down */
1262 {
1263 uint p0, p1, q, tmp;
1264 ulong msec;
1265 Point mp, pt0, pt1, qt;
1266 int reg, b;
1267
1268 mp = mc->m.xy;
1269 b = mc->m.buttons;
1270 msec = mc->m.msec;
1271
1272 /* remove tick */
1273 if(f->p0 == f->p1)
1274 frtick(f, frptofchar(f, f->p0), 0);
1275 p0 = p1 = frcharofpt(f, mp);
1276 pt0 = frptofchar(f, p0);
1277 pt1 = frptofchar(f, p1);
1278 reg = 0;
1279 frtick(f, pt0, 1);
1280 do{
1281 q = frcharofpt(f, mc->m.xy);
1282 if(p1 != q){
1283 if(p0 == p1)
1284 frtick(f, pt0, 0);
1285 if(reg != region(q, p0)){ /* crossed starting point; reset */
1286 if(reg > 0)
1287 selrestore(f, pt0, p0, p1);
1288 else if(reg < 0)
1289 selrestore(f, pt1, p1, p0);
1290 p1 = p0;
1291 pt1 = pt0;
1292 reg = region(q, p0);
1293 if(reg == 0)
1294 frdrawsel0(f, pt0, p0, p1, col, display->white);
1295 }
1296 qt = frptofchar(f, q);
1297 if(reg > 0){
1298 if(q > p1)
1299 frdrawsel0(f, pt1, p1, q, col, display->white);
1300
1301 else if(q < p1)
1302 selrestore(f, qt, q, p1);
1303 }else if(reg < 0){
1304 if(q > p1)
1305 selrestore(f, pt1, p1, q);
1306 else
1307 frdrawsel0(f, qt, q, p1, col, display->white);
1308 }
1309 p1 = q;
1310 pt1 = qt;
1311 }
1312 if(p0 == p1)
1313 frtick(f, pt0, 1);
1314 flushimage(f->display, 1);
1315 readmouse(mc);
1316 }while(mc->m.buttons == b);
1317 if(mc->m.msec-msec < DELAY && p0!=p1
1318 && abs(mp.x-mc->m.xy.x)<MINMOVE
1319 && abs(mp.y-mc->m.xy.y)<MINMOVE) {
1320 if(reg > 0)
1321 selrestore(f, pt0, p0, p1);
1322 else if(reg < 0)
1323 selrestore(f, pt1, p1, p0);
1324 p1 = p0;
1325 }
1326 if(p1 < p0){
1327 tmp = p0;
1328 p0 = p1;
1329 p1 = tmp;
1330 }
1331 pt0 = frptofchar(f, p0);
1332 if(p0 == p1)
1333 frtick(f, pt0, 0);
1334 selrestore(f, pt0, p0, p1);
1335 /* restore tick */
1336 if(f->p0 == f->p1)
1337 frtick(f, frptofchar(f, f->p0), 1);
1338 flushimage(f->display, 1);
1339 *p1p = p1;
1340 return p0;
1341 }
1342
1343 int
1344 textselect23(Text *t, uint *q0, uint *q1, Image *high, int mask)
1345 {
1346 uint p0, p1;
1347 int buts;
1348
1349 p0 = xselect(&t->fr, mousectl, high, &p1);
1350 buts = mousectl->m.buttons;
1351 if((buts & mask) == 0){
1352 *q0 = p0+t->org;
1353 *q1 = p1+t->org;
1354 }
1355
1356 while(mousectl->m.buttons)
1357 readmouse(mousectl);
1358 return buts;
1359 }
1360
1361 int
1362 textselect2(Text *t, uint *q0, uint *q1, Text **tp)
1363 {
1364 int buts;
1365
1366 *tp = nil;
1367 buts = textselect23(t, q0, q1, but2col, 4);
1368 if(buts & 4)
1369 return 0;
1370 if(buts & 1){ /* pick up argument */
1371 *tp = argtext;
1372 return 1;
1373 }
1374 return 1;
1375 }
1376
1377 int
1378 textselect3(Text *t, uint *q0, uint *q1)
1379 {
1380 int h;
1381
1382 h = (textselect23(t, q0, q1, but3col, 1|2) == 0);
1383 return h;
1384 }
1385
1386 static Rune left1[] = { '{', '[', '(', '<', 0xab, 0 };
1387 static Rune right1[] = { '}', ']', ')', '>', 0xbb, 0 };
1388 static Rune left2[] = { '\n', 0 };
1389 static Rune left3[] = { '\'', '"', '`', 0 };
1390
1391 static
1392 Rune *left[] = {
1393 left1,
1394 left2,
1395 left3,
1396 nil
1397 };
1398 static
1399 Rune *right[] = {
1400 right1,
1401 left2,
1402 left3,
1403 nil
1404 };
1405
1406 void
1407 textdoubleclick(Text *t, uint *q0, uint *q1)
1408 {
1409 int c, i;
1410 Rune *r, *l, *p;
1411 uint q;
1412
1413 if(textclickhtmlmatch(t, q0, q1))
1414 return;
1415
1416 for(i=0; left[i]!=nil; i++){
1417 q = *q0;
1418 l = left[i];
1419 r = right[i];
1420 /* try matching character to left, looking right */
1421 if(q == 0)
1422 c = '\n';
1423 else
1424 c = textreadc(t, q-1);
1425 p = runestrchr(l, c);
1426 if(p != nil){
1427 if(textclickmatch(t, c, r[p-l], 1, &q))
1428 *q1 = q-(c!='\n');
1429 return;
1430 }
1431 /* try matching character to right, looking left */
1432 if(q == t->file->b.nc)
1433 c = '\n';
1434 else
1435 c = textreadc(t, q);
1436 p = runestrchr(r, c);
1437 if(p != nil){
1438 if(textclickmatch(t, c, l[p-r], -1, &q)){
1439 *q1 = *q0+(*q0<t->file->b.nc && c=='\n');
1440 *q0 = q;
1441 if(c!='\n' || q!=0 || textreadc(t, 0)=='\n')
1442 (*q0)++;
1443 }
1444 return;
1445 }
1446 }
1447
1448 /* try filling out word to right */
1449 while(*q1<t->file->b.nc && isalnum(textreadc(t, *q1)))
1450 (*q1)++;
1451 /* try filling out word to left */
1452 while(*q0>0 && isalnum(textreadc(t, *q0-1)))
1453 (*q0)--;
1454 }
1455
1456 int
1457 textclickmatch(Text *t, int cl, int cr, int dir, uint *q)
1458 {
1459 Rune c;
1460 int nest;
1461
1462 nest = 1;
1463 for(;;){
1464 if(dir > 0){
1465 if(*q == t->file->b.nc)
1466 break;
1467 c = textreadc(t, *q);
1468 (*q)++;
1469 }else{
1470 if(*q == 0)
1471 break;
1472 (*q)--;
1473 c = textreadc(t, *q);
1474 }
1475 if(c == cr){
1476 if(--nest==0)
1477 return 1;
1478 }else if(c == cl)
1479 nest++;
1480 }
1481 return cl=='\n' && nest==1;
1482 }
1483
1484 // Is the text starting at location q an html tag?
1485 // Return 1 for <a>, -1 for </a>, 0 for no tag or <a />.
1486 // Set *q1, if non-nil, to the location after the tag.
1487 static int
1488 ishtmlstart(Text *t, uint q, uint *q1)
1489 {
1490 int c, c1, c2;
1491
1492 if(q+2 > t->file->b.nc)
1493 return 0;
1494 if(textreadc(t, q++) != '<')
1495 return 0;
1496 c = textreadc(t, q++);
1497 c1 = c;
1498 c2 = c;
1499 while(c != '>') {
1500 if(q >= t->file->b.nc)
1501 return 0;
1502 c2 = c;
1503 c = textreadc(t, q++);
1504 }
1505 if(q1)
1506 *q1 = q;
1507 if(c1 == '/') // closing tag
1508 return -1;
1509 if(c2 == '/' || c2 == '!') // open + close tag or comment
1510 return 0;
1511 return 1;
1512 }
1513
1514 // Is the text ending at location q an html tag?
1515 // Return 1 for <a>, -1 for </a>, 0 for no tag or <a />.
1516 // Set *q0, if non-nil, to the start of the tag.
1517 static int
1518 ishtmlend(Text *t, uint q, uint *q0)
1519 {
1520 int c, c1, c2;
1521
1522 if(q < 2)
1523 return 0;
1524 if(textreadc(t, --q) != '>')
1525 return 0;
1526 c = textreadc(t, --q);
1527 c1 = c;
1528 c2 = c;
1529 while(c != '<') {
1530 if(q == 0)
1531 return 0;
1532 c1 = c;
1533 c = textreadc(t, --q);
1534 }
1535 if(q0)
1536 *q0 = q;
1537 if(c1 == '/') // closing tag
1538 return -1;
1539 if(c2 == '/' || c2 == '!') // open + close tag or comment
1540 return 0;
1541 return 1;
1542 }
1543
1544 int
1545 textclickhtmlmatch(Text *t, uint *q0, uint *q1)
1546 {
1547 int depth, n;
1548 uint q, nq;
1549
1550 q = *q0;
1551 // after opening tag? scan forward for closing tag
1552 if(ishtmlend(t, q, nil) == 1) {
1553 depth = 1;
1554 while(q < t->file->b.nc) {
1555 n = ishtmlstart(t, q, &nq);
1556 if(n != 0) {
1557 depth += n;
1558 if(depth == 0) {
1559 *q1 = q;
1560 return 1;
1561 }
1562 q = nq;
1563 continue;
1564 }
1565 q++;
1566 }
1567 }
1568
1569 // before closing tag? scan backward for opening tag
1570 if(ishtmlstart(t, q, nil) == -1) {
1571 depth = -1;
1572 while(q > 0) {
1573 n = ishtmlend(t, q, &nq);
1574 if(n != 0) {
1575 depth += n;
1576 if(depth == 0) {
1577 *q0 = q;
1578 return 1;
1579 }
1580 q = nq;
1581 continue;
1582 }
1583 q--;
1584 }
1585 }
1586
1587 return 0;
1588 }
1589
1590 uint
1591 textbacknl(Text *t, uint p, uint n)
1592 {
1593 int i, j;
1594
1595 /* look for start of this line if n==0 */
1596 if(n==0 && p>0 && textreadc(t, p-1)!='\n')
1597 n = 1;
1598 i = n;
1599 while(i-->0 && p>0){
1600 --p; /* it's at a newline now; back over it */
1601 if(p == 0)
1602 break;
1603 /* at 128 chars, call it a line anyway */
1604 for(j=128; --j>0 && p>0; p--)
1605 if(textreadc(t, p-1)=='\n')
1606 break;
1607 }
1608 return p;
1609 }
1610
1611 void
1612 textsetorigin(Text *t, uint org, int exact)
1613 {
1614 int i, a, fixup;
1615 Rune *r;
1616 uint n;
1617
1618 if(org>0 && !exact && textreadc(t, org-1) != '\n'){
1619 /* org is an estimate of the char posn; find a newline */
1620 /* don't try harder than 256 chars */
1621 for(i=0; i<256 && org<t->file->b.nc; i++){
1622 if(textreadc(t, org) == '\n'){
1623 org++;
1624 break;
1625 }
1626 org++;
1627 }
1628 }
1629 a = org-t->org;
1630 fixup = 0;
1631 if(a>=0 && a<t->fr.nchars){
1632 frdelete(&t->fr, 0, a);
1633 fixup = 1; /* frdelete can leave end of last line in wrong selection mode; it doesn't know what follows */
1634 }
1635 else if(a<0 && -a<t->fr.nchars){
1636 n = t->org - org;
1637 r = runemalloc(n);
1638 bufread(&t->file->b, org, r, n);
1639 frinsert(&t->fr, r, r+n, 0);
1640 free(r);
1641 }else
1642 frdelete(&t->fr, 0, t->fr.nchars);
1643 t->org = org;
1644 textfill(t);
1645 textscrdraw(t);
1646 textsetselect(t, t->q0, t->q1);
1647 if(fixup && t->fr.p1 > t->fr.p0)
1648 frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p1-1), t->fr.p1-1, t->fr.p1, 1);
1649 }
1650
1651 void
1652 textreset(Text *t)
1653 {
1654 t->file->seq = 0;
1655 t->eq0 = ~0;
1656 /* do t->delete(0, t->nc, TRUE) without building backup stuff */
1657 textsetselect(t, t->org, t->org);
1658 frdelete(&t->fr, 0, t->fr.nchars);
1659 t->org = 0;
1660 t->q0 = 0;
1661 t->q1 = 0;
1662 filereset(t->file);
1663 bufreset(&t->file->b);
1664 }