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Date:: Mon Dec 27 16:57:41 2004 UTC
Message:: dumb porting bugs
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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 <complete.h>
12 #include "dat.h"
13 #include "fns.h"
14 
15 Image	*tagcols[NCOL];
16 Image	*textcols[NCOL];
17 static Rune Ldot[] = { '.', 0 };
18 
19 enum{
20 	TABDIR = 3	/* width of tabs in directory windows */
21 };
22 
23 void
24 textinit(Text *t, File *f, Rectangle r, Reffont *rf, Image *cols[NCOL])
25 {
26 	t->file = f;
27 	t->all = r;
28 	t->scrollr = r;
29 	t->scrollr.max.x = r.min.x+Scrollwid;
30 	t->lastsr = nullrect;
31 	r.min.x += Scrollwid+Scrollgap;
32 	t->eq0 = ~0;
33 	t->ncache = 0;
34 	t->reffont = rf;
35 	t->tabstop = maxtab;
36 	memmove(t->fr.cols, cols, sizeof t->fr.cols);
37 	textredraw(t, r, rf->f, screen, -1);
38 }
39 
40 void
41 textredraw(Text *t, Rectangle r, Font *f, Image *b, int odx)
42 {
43 	int maxt;
44 	Rectangle rr;
45 
46 	frinit(&t->fr, r, f, b, t->fr.cols);
47 	rr = t->fr.r;
48 	rr.min.x -= Scrollwid+Scrollgap;	/* back fill to scroll bar */
49 	draw(t->fr.b, rr, t->fr.cols[BACK], nil, ZP);
50 	/* use no wider than 3-space tabs in a directory */
51 	maxt = maxtab;
52 	if(t->what == Body){
53 		if(t->w->isdir)
54 			maxt = min(TABDIR, maxtab);
55 		else
56 			maxt = t->tabstop;
57 	}
58 	t->fr.maxtab = maxt*stringwidth(f, "0");
59 	if(t->what==Body && t->w->isdir && odx!=Dx(t->all)){
60 		if(t->fr.maxlines > 0){
61 			textreset(t);
62 			textcolumnate(t, t->w->dlp,  t->w->ndl);
63 			textshow(t, 0, 0, 1);
64 		}
65 	}else{
66 		textfill(t);
67 		textsetselect(t, t->q0, t->q1);
68 	}
69 }
70 
71 int
72 textresize(Text *t, Rectangle r)
73 {
74 	int odx;
75 
76 	if(Dy(r) > 0)
77 		r.max.y -= Dy(r)%t->fr.font->height;
78 	else
79 		r.max.y = r.min.y;
80 	odx = Dx(t->all);
81 	t->all = r;
82 	t->scrollr = r;
83 	t->scrollr.max.x = r.min.x+Scrollwid;
84 	t->lastsr = nullrect;
85 	r.min.x += Scrollwid+Scrollgap;
86 	frclear(&t->fr, 0);
87 	textredraw(t, r, t->fr.font, screen, odx);
88 	return r.max.y;
89 }
90 
91 void
92 textclose(Text *t)
93 {
94 	free(t->cache);
95 	frclear(&t->fr, 1);
96 	filedeltext(t->file, t);
97 	t->file = nil;
98 	rfclose(t->reffont);
99 	if(argtext == t)
100 		argtext = nil;
101 	if(typetext == t)
102 		typetext = nil;
103 	if(seltext == t)
104 		seltext = nil;
105 	if(mousetext == t)
106 		mousetext = nil;
107 	if(barttext == t)
108 		barttext = nil;
109 }
110 
111 int
112 dircmp(const void *a, const void *b)
113 {
114 	Dirlist *da, *db;
115 	int i, n;
116 
117 	da = *(Dirlist**)a;
118 	db = *(Dirlist**)b;
119 	n = min(da->nr, db->nr);
120 	i = memcmp(da->r, db->r, n*sizeof(Rune));
121 	if(i)
122 		return i;
123 	return da->nr - db->nr;
124 }
125 
126 void
127 textcolumnate(Text *t, Dirlist **dlp, int ndl)
128 {
129 	int i, j, w, colw, mint, maxt, ncol, nrow;
130 	Dirlist *dl;
131 	uint q1;
132 	static Rune Lnl[] = { '\n', 0 };
133 	static Rune Ltab[] = { '\t', 0 };
134 
135 	if(t->file->ntext > 1)
136 		return;
137 	mint = stringwidth(t->fr.font, "0");
138 	/* go for narrower tabs if set more than 3 wide */
139 	t->fr.maxtab = min(maxtab, TABDIR)*mint;
140 	maxt = t->fr.maxtab;
141 	colw = 0;
142 	for(i=0; i<ndl; i++){
143 		dl = dlp[i];
144 		w = dl->wid;
145 		if(maxt-w%maxt < mint || w%maxt==0)
146 			w += mint;
147 		if(w % maxt)
148 			w += maxt-(w%maxt);
149 		if(w > colw)
150 			colw = w;
151 	}
152 	if(colw == 0)
153 		ncol = 1;
154 	else
155 		ncol = max(1, Dx(t->fr.r)/colw);
156 	nrow = (ndl+ncol-1)/ncol;
157 
158 	q1 = 0;
159 	for(i=0; i<nrow; i++){
160 		for(j=i; j<ndl; j+=nrow){
161 			dl = dlp[j];
162 			fileinsert(t->file, q1, dl->r, dl->nr);
163 			q1 += dl->nr;
164 			if(j+nrow >= ndl)
165 				break;
166 			w = dl->wid;
167 			if(maxt-w%maxt < mint){
168 				fileinsert(t->file, q1, Ltab, 1);
169 				q1++;
170 				w += mint;
171 			}
172 			do{
173 				fileinsert(t->file, q1, Ltab, 1);
174 				q1++;
175 				w += maxt-(w%maxt);
176 			}while(w < colw);
177 		}
178 		fileinsert(t->file, q1, Lnl, 1);
179 		q1++;
180 	}
181 }
182 
183 uint
184 textload(Text *t, uint q0, char *file, int setqid)
185 {
186 	Rune *rp;
187 	Dirlist *dl, **dlp;
188 	int fd, i, j, n, ndl, nulls;
189 	uint q, q1;
190 	Dir *d, *dbuf;
191 	char *tmp;
192 	Text *u;
193 
194 	if(t->ncache!=0 || t->file->b.nc || t->w==nil || t!=&t->w->body || (t->w->isdir && t->file->nname==0))
195 		error("text.load");
196 	if(t->w->isdir && t->file->nname==0){
197 		warning(nil, "empty directory name");
198 		return 0;
199 	}
200 	fd = open(file, OREAD);
201 	if(fd < 0){
202 		warning(nil, "can't open %s: %r\n", file);
203 		return 0;
204 	}
205 	d = dirfstat(fd);
206 	if(d == nil){
207 		warning(nil, "can't fstat %s: %r\n", file);
208 		goto Rescue;
209 	}
210 	nulls = FALSE;
211 	if(d->qid.type & QTDIR){
212 		/* this is checked in get() but it's possible the file changed underfoot */
213 		if(t->file->ntext > 1){
214 			warning(nil, "%s is a directory; can't read with multiple windows on it\n", file);
215 			goto Rescue;
216 		}
217 		t->w->isdir = TRUE;
218 		t->w->filemenu = FALSE;
219 		if(t->file->name[t->file->nname-1] != '/'){
220 			rp = runemalloc(t->file->nname+1);
221 			runemove(rp, t->file->name, t->file->nname);
222 			rp[t->file->nname] = '/';
223 			winsetname(t->w, rp, t->file->nname+1);
224 			free(rp);
225 		}
226 		dlp = nil;
227 		ndl = 0;
228 		dbuf = nil;
229 		while((n=dirread(fd, &dbuf)) > 0){
230 			for(i=0; i<n; i++){
231 				dl = emalloc(sizeof(Dirlist));
232 				j = strlen(dbuf[i].name);
233 				tmp = emalloc(j+1+1);
234 				memmove(tmp, dbuf[i].name, j);
235 				if(dbuf[i].qid.type & QTDIR)
236 					tmp[j++] = '/';
237 				tmp[j] = '\0';
238 				dl->r = bytetorune(tmp, &dl->nr);
239 				dl->wid = stringwidth(t->fr.font, tmp);
240 				free(tmp);
241 				ndl++;
242 				dlp = realloc(dlp, ndl*sizeof(Dirlist*));
243 				dlp[ndl-1] = dl;
244 			}
245 			free(dbuf);
246 		}
247 		qsort(dlp, ndl, sizeof(Dirlist*), dircmp);
248 		t->w->dlp = dlp;
249 		t->w->ndl = ndl;
250 		textcolumnate(t, dlp, ndl);
251 		q1 = t->file->b.nc;
252 	}else{
253 		t->w->isdir = FALSE;
254 		t->w->filemenu = TRUE;
255 		q1 = q0 + fileload(t->file, q0, fd, &nulls);
256 	}
257 	if(setqid){
258 		t->file->dev = d->dev;
259 		t->file->mtime = d->mtime;
260 		t->file->qidpath = d->qid.path;
261 	}
262 	close(fd);
263 	rp = fbufalloc();
264 	for(q=q0; q<q1; q+=n){
265 		n = q1-q;
266 		if(n > RBUFSIZE)
267 			n = RBUFSIZE;
268 		bufread(&t->file->b, q, rp, n);
269 		if(q < t->org)
270 			t->org += n;
271 		else if(q <= t->org+t->fr.nchars)
272 			frinsert(&t->fr, rp, rp+n, q-t->org);
273 		if(t->fr.lastlinefull)
274 			break;
275 	}
276 	fbuffree(rp);
277 	for(i=0; i<t->file->ntext; i++){
278 		u = t->file->text[i];
279 		if(u != t){
280 			if(u->org > u->file->b.nc)	/* will be 0 because of reset(), but safety first */
281 				u->org = 0;
282 			textresize(u, u->all);
283 			textbacknl(u, u->org, 0);	/* go to beginning of line */
284 		}
285 		textsetselect(u, q0, q0);
286 	}
287 	if(nulls)
288 		warning(nil, "%s: NUL bytes elided\n", file);
289 	free(d);
290 	return q1-q0;
291 
292     Rescue:
293 	close(fd);
294 	return 0;
295 }
296 
297 uint
298 textbsinsert(Text *t, uint q0, Rune *r, uint n, int tofile, int *nrp)
299 {
300 	Rune *bp, *tp, *up;
301 	int i, initial;
302 
303 	if(t->what == Tag){	/* can't happen but safety first: mustn't backspace over file name */
304     Err:
305 		textinsert(t, q0, r, n, tofile);
306 		*nrp = n;
307 		return q0;
308 	}
309 	bp = r;
310 	for(i=0; i<n; i++)
311 		if(*bp++ == '\b'){
312 			--bp;
313 			initial = 0;
314 			tp = runemalloc(n);
315 			runemove(tp, r, i);
316 			up = tp+i;
317 			for(; i<n; i++){
318 				*up = *bp++;
319 				if(*up == '\b')
320 					if(up == tp)
321 						initial++;
322 					else
323 						--up;
324 				else
325 					up++;
326 			}
327 			if(initial){
328 				if(initial > q0)
329 					initial = q0;
330 				q0 -= initial;
331 				textdelete(t, q0, q0+initial, tofile);
332 			}
333 			n = up-tp;
334 			textinsert(t, q0, tp, n, tofile);
335 			free(tp);
336 			*nrp = n;
337 			return q0;
338 		}
339 	goto Err;
340 }
341 
342 void
343 textinsert(Text *t, uint q0, Rune *r, uint n, int tofile)
344 {
345 	int c, i;
346 	Text *u;
347 
348 	if(tofile && t->ncache != 0)
349 		error("text.insert");
350 	if(n == 0)
351 		return;
352 	if(tofile){
353 		fileinsert(t->file, q0, r, n);
354 		if(t->what == Body){
355 			t->w->dirty = TRUE;
356 			t->w->utflastqid = -1;
357 		}
358 		if(t->file->ntext > 1)
359 			for(i=0; i<t->file->ntext; i++){
360 				u = t->file->text[i];
361 				if(u != t){
362 					u->w->dirty = TRUE;	/* always a body */
363 					textinsert(u, q0, r, n, FALSE);
364 					textsetselect(u, u->q0, u->q1);
365 					textscrdraw(u);
366 				}
367 			}
368 					
369 	}
370 	if(q0 < t->q1)
371 		t->q1 += n;
372 	if(q0 < t->q0)
373 		t->q0 += n;
374 	if(q0 < t->org)
375 		t->org += n;
376 	else if(q0 <= t->org+t->fr.nchars)
377 		frinsert(&t->fr, r, r+n, q0-t->org);
378 	if(t->w){
379 		c = 'i';
380 		if(t->what == Body)
381 			c = 'I';
382 		if(n <= EVENTSIZE)
383 			winevent(t->w, "%c%d %d 0 %d %.*S\n", c, q0, q0+n, n, n, r);
384 		else
385 			winevent(t->w, "%c%d %d 0 0 \n", c, q0, q0+n, n);
386 	}
387 }
388 
389 
390 void
391 textfill(Text *t)
392 {
393 	Rune *rp;
394 	int i, n, m, nl;
395 
396 	if(t->fr.lastlinefull || t->nofill)
397 		return;
398 	if(t->ncache > 0){
399 		if(t->w != nil)
400 			wincommit(t->w, t);
401 		else
402 			textcommit(t, TRUE);
403 	}
404 	rp = fbufalloc();
405 	do{
406 		n = t->file->b.nc-(t->org+t->fr.nchars);
407 		if(n == 0)
408 			break;
409 		if(n > 2000)	/* educated guess at reasonable amount */
410 			n = 2000;
411 		bufread(&t->file->b, t->org+t->fr.nchars, rp, n);
412 		/*
413 		 * it's expensive to frinsert more than we need, so
414 		 * count newlines.
415 		 */
416 		nl = t->fr.maxlines-t->fr.nlines;
417 		m = 0;
418 		for(i=0; i<n; ){
419 			if(rp[i++] == '\n'){
420 				m++;
421 				if(m >= nl)
422 					break;
423 			}
424 		}
425 		frinsert(&t->fr, rp, rp+i, t->fr.nchars);
426 	}while(t->fr.lastlinefull == FALSE);
427 	fbuffree(rp);
428 }
429 
430 void
431 textdelete(Text *t, uint q0, uint q1, int tofile)
432 {
433 	uint n, p0, p1;
434 	int i, c;
435 	Text *u;
436 
437 	if(tofile && t->ncache != 0)
438 		error("text.delete");
439 	n = q1-q0;
440 	if(n == 0)
441 		return;
442 	if(tofile){
443 		filedelete(t->file, q0, q1);
444 		if(t->what == Body){
445 			t->w->dirty = TRUE;
446 			t->w->utflastqid = -1;
447 		}
448 		if(t->file->ntext > 1)
449 			for(i=0; i<t->file->ntext; i++){
450 				u = t->file->text[i];
451 				if(u != t){
452 					u->w->dirty = TRUE;	/* always a body */
453 					textdelete(u, q0, q1, FALSE);
454 					textsetselect(u, u->q0, u->q1);
455 					textscrdraw(u);
456 				}
457 			}
458 	}
459 	if(q0 < t->q0)
460 		t->q0 -= min(n, t->q0-q0);
461 	if(q0 < t->q1)
462 		t->q1 -= min(n, t->q1-q0);
463 	if(q1 <= t->org)
464 		t->org -= n;
465 	else if(q0 < t->org+t->fr.nchars){
466 		p1 = q1 - t->org;
467 		if(p1 > t->fr.nchars)
468 			p1 = t->fr.nchars;
469 		if(q0 < t->org){
470 			t->org = q0;
471 			p0 = 0;
472 		}else
473 			p0 = q0 - t->org;
474 		frdelete(&t->fr, p0, p1);
475 		textfill(t);
476 	}
477 	if(t->w){
478 		c = 'd';
479 		if(t->what == Body)
480 			c = 'D';
481 		winevent(t->w, "%c%d %d 0 0 \n", c, q0, q1);
482 	}
483 }
484 
485 void
486 textconstrain(Text *t, uint q0, uint q1, uint *p0, uint *p1)
487 {
488 	*p0 = min(q0, t->file->b.nc);
489 	*p1 = min(q1, t->file->b.nc);
490 }
491 
492 Rune
493 textreadc(Text *t, uint q)
494 {
495 	Rune r;
496 
497 	if(t->cq0<=q && q<t->cq0+t->ncache)
498 		r = t->cache[q-t->cq0];
499 	else
500 		bufread(&t->file->b, q, &r, 1);
501 	return r;
502 }
503 
504 int
505 textbswidth(Text *t, Rune c)
506 {
507 	uint q, eq;
508 	Rune r;
509 	int skipping;
510 
511 	/* there is known to be at least one character to erase */
512 	if(c == 0x08)	/* ^H: erase character */
513 		return 1;
514 	q = t->q0;
515 	skipping = TRUE;
516 	while(q > 0){
517 		r = textreadc(t, q-1);
518 		if(r == '\n'){		/* eat at most one more character */
519 			if(q == t->q0)	/* eat the newline */
520 				--q;
521 			break; 
522 		}
523 		if(c == 0x17){
524 			eq = isalnum(r);
525 			if(eq && skipping)	/* found one; stop skipping */
526 				skipping = FALSE;
527 			else if(!eq && !skipping)
528 				break;
529 		}
530 		--q;
531 	}
532 	return t->q0-q;
533 }
534 
535 int
536 textfilewidth(Text *t, uint q0, int oneelement)
537 {
538 	uint q;
539 	Rune r;
540 
541 	q = q0;
542 	while(q > 0){
543 		r = textreadc(t, q-1);
544 		if(r <= ' ')
545 			break;
546 		if(oneelement && r=='/')
547 			break;
548 		--q;
549 	}
550 	return q0-q;
551 }
552 
553 Rune*
554 textcomplete(Text *t)
555 {
556 	int i, nstr, npath;
557 	uint q;
558 	Rune tmp[200];
559 	Rune *str, *path;
560 	Rune *rp;
561 	Completion *c;
562 	char *s, *dirs;
563 	Runestr dir;
564 
565 	/* control-f: filename completion; works back to white space or / */
566 	if(t->q0<t->file->b.nc && textreadc(t, t->q0)>' ')	/* must be at end of word */
567 		return nil;
568 	nstr = textfilewidth(t, t->q0, TRUE);
569 	str = runemalloc(nstr);
570 	npath = textfilewidth(t, t->q0-nstr, FALSE);
571 	path = runemalloc(npath);
572 
573 	c = nil;
574 	rp = nil;
575 	dirs = nil;
576 
577 	q = t->q0-nstr;
578 	for(i=0; i<nstr; i++)
579 		str[i] = textreadc(t, q++);
580 	q = t->q0-nstr-npath;
581 	for(i=0; i<npath; i++)
582 		path[i] = textreadc(t, q++);
583 	/* is path rooted? if not, we need to make it relative to window path */
584 	if(npath>0 && path[0]=='/')
585 		dir = runestr(path, npath);
586 	else{
587 		dir = dirname(t, nil, 0);
588 		if(dir.nr + 1 + npath > nelem(tmp)){
589 			free(dir.r);
590 			goto Return;
591 		}
592 		if(dir.nr == 0){
593 			dir.nr = 1;
594 			dir.r = runestrdup(Ldot);
595 		}
596 		runemove(tmp, dir.r, dir.nr);
597 		tmp[dir.nr] = '/';
598 		runemove(tmp+dir.nr+1, path, npath);
599 		free(dir.r);
600 		dir.r = tmp;
601 		dir.nr += 1+npath;
602 		dir = cleanrname(dir);
603 	}
604 
605 	s = smprint("%.*S", nstr, str);
606 	dirs = smprint("%.*S", dir.nr, dir.r);
607 	c = complete(dirs, s);
608 	free(s);
609 	if(c == nil){
610 		warning(nil, "error attempting completion: %r\n");
611 		goto Return;
612 	}
613 
614 	if(!c->advance){
615 		warning(nil, "%.*S%s%.*S*%s\n",
616 			dir.nr, dir.r,
617 			dir.nr>0 && dir.r[dir.nr-1]!='/' ? "/" : "",
618 			nstr, str,
619 			c->nmatch ? "" : ": no matches in:");
620 		for(i=0; i<c->nfile; i++)
621 			warning(nil, " %s\n", c->filename[i]);
622 	}
623 
624 	if(c->advance)
625 		rp = runesmprint("%s", c->string);
626 	else
627 		rp = nil;
628   Return:
629 	freecompletion(c);
630 	free(dirs);
631 	free(str);
632 	free(path);
633 	return rp;
634 }
635 
636 void
637 texttype(Text *t, Rune r)
638 {
639 	uint q0, q1;
640 	int nnb, nb, n, i;
641 	int nr;
642 	Rune *rp;
643 	Text *u;
644 
645 	if(t->what!=Body && r=='\n')
646 		return;
647 	nr = 1;
648 	rp = &r;
649 	switch(r){
650 	case Kleft:
651 		if(t->q0 > 0){
652 			if(t->w)
653 				wincommit(t->w, t);
654 			else
655 				textcommit(t, TRUE);
656 			textshow(t, t->q0-1, t->q0-1, TRUE);
657 		}
658 		return;
659 	case Kright:
660 		if(t->q1 < t->file->b.nc){
661 			wincommit(t->w, t);
662 			textshow(t, t->q1+1, t->q1+1, TRUE);
663 		}
664 		return;
665 	case Kdown:
666 		n = t->fr.maxlines/3;
667 		goto case_Down;
668 	case Kscrollonedown:
669 		n = mousescrollsize(t->fr.maxlines);
670 		if(n <= 0)
671 			n = 1;
672 		goto case_Down;
673 	case Kpgdown:
674 		n = 2*t->fr.maxlines/3;
675 	case_Down:
676 		q0 = t->org+frcharofpt(&t->fr, Pt(t->fr.r.min.x, t->fr.r.min.y+n*t->fr.font->height));
677 		textsetorigin(t, q0, TRUE);
678 		return;
679 	case Kup:
680 		n = t->fr.maxlines/3;
681 		goto case_Up;
682 	case Kscrolloneup:
683 		n = mousescrollsize(t->fr.maxlines);
684 		goto case_Up;
685 	case Kpgup:
686 		n = 2*t->fr.maxlines/3;
687 	case_Up:
688 		q0 = textbacknl(t, t->org, n);
689 		textsetorigin(t, q0, TRUE);
690 		return;
691 	case Khome:
692 		textshow(t, 0, 0, FALSE);
693 		return;
694 	case Kend:
695 		if(t->w)
696 			wincommit(t->w, t);
697 		else
698 			textcommit(t, TRUE);
699 		textshow(t, t->file->b.nc, t->file->b.nc, FALSE);
700 		return;
701 	}
702 	if(t->what == Body){
703 		seq++;
704 		filemark(t->file);
705 	}
706 	if(t->q1 > t->q0){
707 		if(t->ncache != 0)
708 			error("text.type");
709 		cut(t, t, nil, TRUE, TRUE, nil, 0);
710 		t->eq0 = ~0;
711 	}
712 	textshow(t, t->q0, t->q0, 1);
713 	switch(r){
714 	case 0x06:	/* ^F: complete */
715 	case Kins:
716 		rp = textcomplete(t);
717 		if(rp == nil)
718 			return;
719 		nr = runestrlen(rp);
720 		break;	/* fall through to normal insertion case */
721 	case 0x1B:
722 		if(t->eq0 != ~0)
723 			textsetselect(t, t->eq0, t->q0);
724 		if(t->ncache > 0){
725 			if(t->w != nil)
726 				wincommit(t->w, t);
727 			else
728 				textcommit(t, TRUE);
729 		}
730 		return;
731 	case 0x08:	/* ^H: erase character */
732 	case 0x15:	/* ^U: erase line */
733 	case 0x17:	/* ^W: erase word */
734 		if(t->q0 == 0)	/* nothing to erase */
735 			return;
736 		nnb = textbswidth(t, r);
737 		q1 = t->q0;
738 		q0 = q1-nnb;
739 		/* if selection is at beginning of window, avoid deleting invisible text */
740 		if(q0 < t->org){
741 			q0 = t->org;
742 			nnb = q1-q0;
743 		}
744 		if(nnb <= 0)
745 			return;
746 		for(i=0; i<t->file->ntext; i++){
747 			u = t->file->text[i];
748 			u->nofill = TRUE;
749 			nb = nnb;
750 			n = u->ncache;
751 			if(n > 0){
752 				if(q1 != u->cq0+n)
753 					error("text.type backspace");
754 				if(n > nb)
755 					n = nb;
756 				u->ncache -= n;
757 				textdelete(u, q1-n, q1, FALSE);
758 				nb -= n;
759 			}
760 			if(u->eq0==q1 || u->eq0==~0)
761 				u->eq0 = q0;
762 			if(nb && u==t)
763 				textdelete(u, q0, q0+nb, TRUE);
764 			if(u != t)
765 				textsetselect(u, u->q0, u->q1);
766 			else
767 				textsetselect(t, q0, q0);
768 			u->nofill = FALSE;
769 		}
770 		for(i=0; i<t->file->ntext; i++)
771 			textfill(t->file->text[i]);
772 		return;
773 	case '\n':
774 		if(t->w->autoindent){
775 			/* find beginning of previous line using backspace code */
776 			nnb = textbswidth(t, 0x15); /* ^U case */
777 			rp = runemalloc(nnb + 1);
778 			nr = 0;
779 			rp[nr++] = r;
780 			for(i=0; i<nnb; i++){
781 				r = textreadc(t, t->q0-nnb+i);
782 				if(r != ' ' && r != '\t')
783 					break;
784 				rp[nr++] = r;
785 			}
786 		}
787 		break; /* fall through to normal code */
788 	}
789 	/* otherwise ordinary character; just insert, typically in caches of all texts */
790 	for(i=0; i<t->file->ntext; i++){
791 		u = t->file->text[i];
792 		if(u->eq0 == ~0)
793 			u->eq0 = t->q0;
794 		if(u->ncache == 0)
795 			u->cq0 = t->q0;
796 		else if(t->q0 != u->cq0+u->ncache)
797 			error("text.type cq1");
798 		textinsert(u, t->q0, rp, nr, FALSE);
799 		if(u != t)
800 			textsetselect(u, u->q0, u->q1);
801 		if(u->ncache+nr > u->ncachealloc){
802 			u->ncachealloc += 10 + nr;
803 			u->cache = runerealloc(u->cache, u->ncachealloc);
804 		}
805 		runemove(u->cache+u->ncache, rp, nr);
806 		u->ncache += nr;
807 	}
808 	if(rp != &r)
809 		free(rp);
810 	textsetselect(t, t->q0+nr, t->q0+nr);
811 	if(r=='\n' && t->w!=nil)
812 		wincommit(t->w, t);
813 }
814 
815 void
816 textcommit(Text *t, int tofile)
817 {
818 	if(t->ncache == 0)
819 		return;
820 	if(tofile)
821 		fileinsert(t->file, t->cq0, t->cache, t->ncache);
822 	if(t->what == Body){
823 		t->w->dirty = TRUE;
824 		t->w->utflastqid = -1;
825 	}
826 	t->ncache = 0;
827 }
828 
829 static	Text	*clicktext;
830 static	uint	clickmsec;
831 static	Text	*selecttext;
832 static	uint	selectq;
833 
834 /*
835  * called from frame library
836  */
837 void
838 framescroll(Frame *f, int dl)
839 {
840 	if(f != &selecttext->fr)
841 		error("frameselect not right frame");
842 	textframescroll(selecttext, dl);
843 }
844 
845 void
846 textframescroll(Text *t, int dl)
847 {
848 	uint q0;
849 
850 	if(dl == 0){
851 		scrsleep(100);
852 		return;
853 	}
854 	if(dl < 0){
855 		q0 = textbacknl(t, t->org, -dl);
856 		if(selectq > t->org+t->fr.p0)
857 			textsetselect(t, t->org+t->fr.p0, selectq);
858 		else
859 			textsetselect(t, selectq, t->org+t->fr.p0);
860 	}else{
861 		if(t->org+t->fr.nchars == t->file->b.nc)
862 			return;
863 		q0 = t->org+frcharofpt(&t->fr, Pt(t->fr.r.min.x, t->fr.r.min.y+dl*t->fr.font->height));
864 		if(selectq > t->org+t->fr.p1)
865 			textsetselect(t, t->org+t->fr.p1, selectq);
866 		else
867 			textsetselect(t, selectq, t->org+t->fr.p1);
868 	}
869 	textsetorigin(t, q0, TRUE);
870 }
871 
872 
873 void
874 textselect(Text *t)
875 {
876 	uint q0, q1;
877 	int b, x, y;
878 	int state, op;
879 
880 	selecttext = t;
881 	/*
882 	 * To have double-clicking and chording, we double-click
883 	 * immediately if it might make sense.
884 	 */
885 	b = mouse->buttons;
886 	q0 = t->q0;
887 	q1 = t->q1;
888 	selectq = t->org+frcharofpt(&t->fr, mouse->xy);
889 	if(clicktext==t && mouse->msec-clickmsec<500)
890 	if(q0==q1 && selectq==q0){
891 		textdoubleclick(t, &q0, &q1);
892 		textsetselect(t, q0, q1);
893 		flushimage(display, 1);
894 		x = mouse->xy.x;
895 		y = mouse->xy.y;
896 		/* stay here until something interesting happens */
897 		do
898 			readmouse(mousectl);
899 		while(mouse->buttons==b && abs(mouse->xy.x-x)<3 && abs(mouse->xy.y-y)<3);
900 		mouse->xy.x = x;	/* in case we're calling frselect */
901 		mouse->xy.y = y;
902 		q0 = t->q0;	/* may have changed */
903 		q1 = t->q1;
904 		selectq = q0;
905 	}
906 	if(mouse->buttons == b){
907 		t->fr.scroll = framescroll;
908 		frselect(&t->fr, mousectl);
909 		/* horrible botch: while asleep, may have lost selection altogether */
910 		if(selectq > t->file->b.nc)
911 			selectq = t->org + t->fr.p0;
912 		t->fr.scroll = 0;
913 		if(selectq < t->org)
914 			q0 = selectq;
915 		else
916 			q0 = t->org + t->fr.p0;
917 		if(selectq > t->org+t->fr.nchars)
918 			q1 = selectq;
919 		else
920 			q1 = t->org+t->fr.p1;
921 	}
922 	if(q0 == q1){
923 		if(q0==t->q0 && clicktext==t && mouse->msec-clickmsec<500){
924 			textdoubleclick(t, &q0, &q1);
925 			clicktext = nil;
926 		}else{
927 			clicktext = t;
928 			clickmsec = mouse->msec;
929 		}
930 	}else
931 		clicktext = nil;
932 	textsetselect(t, q0, q1);
933 	flushimage(display, 1);
934 	state = op = 0;	/* undo when possible; +1 for cut, -1 for paste */
935 	while(mouse->buttons){
936 		mouse->msec = 0;
937 		b = mouse->buttons;
938 		if(b & 6){
939 			if(state==0 && op==0 && t->what==Body){
940 				seq++;
941 				filemark(t->w->body.file);
942 			}
943 			if(b & 2){
944 				if(state==-1 && t->what==Body){
945 					winundo(t->w, TRUE);
946 					textsetselect(t, q0, t->q0);
947 					state = 0;
948 				}else if(state != 1 && op != -1){
949 					cut(t, t, nil, TRUE, TRUE, nil, 0);
950 					op = state = 1;
951 				}
952 			}else{
953 				if(state==1 && t->what==Body){
954 					winundo(t->w, TRUE);
955 					textsetselect(t, q0, t->q1);
956 					state = 0;
957 				}else if(state != -1 && op != 1){
958 					paste(t, t, nil, TRUE, FALSE, nil, 0);
959 					op = state = -1;
960 				}
961 			}
962 			textscrdraw(t);
963 			clearmouse();
964 		}
965 		flushimage(display, 1);
966 		while(mouse->buttons == b)
967 			readmouse(mousectl);
968 		clicktext = nil;
969 	}
970 }
971 
972 void
973 textshow(Text *t, uint q0, uint q1, int doselect)
974 {
975 	int qe;
976 	int nl;
977 	uint q;
978 
979 	if(t->what != Body){
980 		if(doselect)
981 			textsetselect(t, q0, q1);
982 		return;
983 	}
984 	if(t->w!=nil && t->fr.maxlines==0)
985 		colgrow(t->col, t->w, 1);
986 	if(doselect)
987 		textsetselect(t, q0, q1);
988 	qe = t->org+t->fr.nchars;
989 	if(t->org<=q0 && (q0<qe || (q0==qe && qe==t->file->b.nc+t->ncache)))
990 		textscrdraw(t);
991 	else{
992 		if(t->w->nopen[QWevent] > 0)
993 			nl = 3*t->fr.maxlines/4;
994 		else
995 			nl = t->fr.maxlines/4;
996 		q = textbacknl(t, q0, nl);
997 		/* avoid going backwards if trying to go forwards - long lines! */
998 		if(!(q0>t->org && q<t->org))
999 			textsetorigin(t, q, TRUE);
1000 		while(q0 > t->org+t->fr.nchars)
1001 			textsetorigin(t, t->org+1, FALSE);
1002 	}
1003 }
1004 
1005 static
1006 int
1007 region(int a, int b)
1008 {
1009 	if(a < b)
1010 		return -1;
1011 	if(a == b)
1012 		return 0;
1013 	return 1;
1014 }
1015 
1016 void
1017 selrestore(Frame *f, Point pt0, uint p0, uint p1)
1018 {
1019 	if(p1<=f->p0 || p0>=f->p1){
1020 		/* no overlap */
1021 		frdrawsel0(f, pt0, p0, p1, f->cols[BACK], f->cols[TEXT]);
1022 		return;
1023 	}
1024 	if(p0>=f->p0 && p1<=f->p1){
1025 		/* entirely inside */
1026 		frdrawsel0(f, pt0, p0, p1, f->cols[HIGH], f->cols[HTEXT]);
1027 		return;
1028 	}
1029 
1030 	/* they now are known to overlap */
1031 
1032 	/* before selection */
1033 	if(p0 < f->p0){
1034 		frdrawsel0(f, pt0, p0, f->p0, f->cols[BACK], f->cols[TEXT]);
1035 		p0 = f->p0;
1036 		pt0 = frptofchar(f, p0);
1037 	}
1038 	/* after selection */
1039 	if(p1 > f->p1){
1040 		frdrawsel0(f, frptofchar(f, f->p1), f->p1, p1, f->cols[BACK], f->cols[TEXT]);
1041 		p1 = f->p1;
1042 	}
1043 	/* inside selection */
1044 	frdrawsel0(f, pt0, p0, p1, f->cols[HIGH], f->cols[HTEXT]);
1045 }
1046 
1047 void
1048 textsetselect(Text *t, uint q0, uint q1)
1049 {
1050 	int p0, p1;
1051 
1052 	/* t->fr.p0 and t->fr.p1 are always right; t->q0 and t->q1 may be off */
1053 	t->q0 = q0;
1054 	t->q1 = q1;
1055 	/* compute desired p0,p1 from q0,q1 */
1056 	p0 = q0-t->org;
1057 	p1 = q1-t->org;
1058 	if(p0 < 0)
1059 		p0 = 0;
1060 	if(p1 < 0)
1061 		p1 = 0;
1062 	if(p0 > t->fr.nchars)
1063 		p0 = t->fr.nchars;
1064 	if(p1 > t->fr.nchars)
1065 		p1 = t->fr.nchars;
1066 	if(p0==t->fr.p0 && p1==t->fr.p1)
1067 		return;
1068 	/* screen disagrees with desired selection */
1069 	if(t->fr.p1<=p0 || p1<=t->fr.p0 || p0==p1 || t->fr.p1==t->fr.p0){
1070 		/* no overlap or too easy to bother trying */
1071 		frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p0), t->fr.p0, t->fr.p1, 0);
1072 		frdrawsel(&t->fr, frptofchar(&t->fr, p0), p0, p1, 1);
1073 		goto Return;
1074 	}
1075 	/* overlap; avoid unnecessary painting */
1076 	if(p0 < t->fr.p0){
1077 		/* extend selection backwards */
1078 		frdrawsel(&t->fr, frptofchar(&t->fr, p0), p0, t->fr.p0, 1);
1079 	}else if(p0 > t->fr.p0){
1080 		/* trim first part of selection */
1081 		frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p0), t->fr.p0, p0, 0);
1082 	}
1083 	if(p1 > t->fr.p1){
1084 		/* extend selection forwards */
1085 		frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p1), t->fr.p1, p1, 1);
1086 	}else if(p1 < t->fr.p1){
1087 		/* trim last part of selection */
1088 		frdrawsel(&t->fr, frptofchar(&t->fr, p1), p1, t->fr.p1, 0);
1089 	}
1090 
1091     Return:
1092 	t->fr.p0 = p0;
1093 	t->fr.p1 = p1;
1094 }
1095 
1096 /*
1097  * Release the button in less than DELAY ms and it's considered a null selection
1098  * if the mouse hardly moved, regardless of whether it crossed a char boundary.
1099  */
1100 enum {
1101 	DELAY = 2,
1102 	MINMOVE = 4,
1103 };
1104 
1105 uint
1106 xselect(Frame *f, Mousectl *mc, Image *col, uint *p1p)	/* when called, button is down */
1107 {
1108 	uint p0, p1, q, tmp;
1109 	ulong msec;
1110 	Point mp, pt0, pt1, qt;
1111 	int reg, b;
1112 
1113 	mp = mc->m.xy;
1114 	b = mc->m.buttons;
1115 	msec = mc->m.msec;
1116 
1117 	/* remove tick */
1118 	if(f->p0 == f->p1)
1119 		frtick(f, frptofchar(f, f->p0), 0);
1120 	p0 = p1 = frcharofpt(f, mp);
1121 	pt0 = frptofchar(f, p0);
1122 	pt1 = frptofchar(f, p1);
1123 	reg = 0;
1124 	frtick(f, pt0, 1);
1125 	do{
1126 		q = frcharofpt(f, mc->m.xy);
1127 		if(p1 != q){
1128 			if(p0 == p1)
1129 				frtick(f, pt0, 0);
1130 			if(reg != region(q, p0)){	/* crossed starting point; reset */
1131 				if(reg > 0)
1132 					selrestore(f, pt0, p0, p1);
1133 				else if(reg < 0)
1134 					selrestore(f, pt1, p1, p0);
1135 				p1 = p0;
1136 				pt1 = pt0;
1137 				reg = region(q, p0);
1138 				if(reg == 0)
1139 					frdrawsel0(f, pt0, p0, p1, col, display->white);
1140 			}
1141 			qt = frptofchar(f, q);
1142 			if(reg > 0){
1143 				if(q > p1)
1144 					frdrawsel0(f, pt1, p1, q, col, display->white);
1145 
1146 				else if(q < p1)
1147 					selrestore(f, qt, q, p1);
1148 			}else if(reg < 0){
1149 				if(q > p1)
1150 					selrestore(f, pt1, p1, q);
1151 				else
1152 					frdrawsel0(f, qt, q, p1, col, display->white);
1153 			}
1154 			p1 = q;
1155 			pt1 = qt;
1156 		}
1157 		if(p0 == p1)
1158 			frtick(f, pt0, 1);
1159 		flushimage(f->display, 1);
1160 		readmouse(mc);
1161 	}while(mc->m.buttons == b);
1162 	if(mc->m.msec-msec < DELAY && p0!=p1
1163 	&& abs(mp.x-mc->m.xy.x)<MINMOVE
1164 	&& abs(mp.y-mc->m.xy.y)<MINMOVE) {
1165 		if(reg > 0)
1166 			selrestore(f, pt0, p0, p1);
1167 		else if(reg < 0)
1168 			selrestore(f, pt1, p1, p0);
1169 		p1 = p0;
1170 	}
1171 	if(p1 < p0){
1172 		tmp = p0;
1173 		p0 = p1;
1174 		p1 = tmp;
1175 	}
1176 	pt0 = frptofchar(f, p0);
1177 	if(p0 == p1)
1178 		frtick(f, pt0, 0);
1179 	selrestore(f, pt0, p0, p1);
1180 	/* restore tick */
1181 	if(f->p0 == f->p1)
1182 		frtick(f, frptofchar(f, f->p0), 1);
1183 	flushimage(f->display, 1);
1184 	*p1p = p1;
1185 	return p0;
1186 }
1187 
1188 int
1189 textselect23(Text *t, uint *q0, uint *q1, Image *high, int mask)
1190 {
1191 	uint p0, p1;
1192 	int buts;
1193 	
1194 	p0 = xselect(&t->fr, mousectl, high, &p1);
1195 	buts = mousectl->m.buttons;
1196 	if((buts & mask) == 0){
1197 		*q0 = p0+t->org;
1198 		*q1 = p1+t->org;
1199 	}
1200 
1201 	while(mousectl->m.buttons)
1202 		readmouse(mousectl);
1203 	return buts;
1204 }
1205 
1206 int
1207 textselect2(Text *t, uint *q0, uint *q1, Text **tp)
1208 {
1209 	int buts;
1210 
1211 	*tp = nil;
1212 	buts = textselect23(t, q0, q1, but2col, 4);
1213 	if(buts & 4)
1214 		return 0;
1215 	if(buts & 1){	/* pick up argument */
1216 		*tp = argtext;
1217 		return 1;
1218 	}
1219 	return 1;
1220 }
1221 
1222 int
1223 textselect3(Text *t, uint *q0, uint *q1)
1224 {
1225 	int h;
1226 
1227 	h = (textselect23(t, q0, q1, but3col, 1|2) == 0);
1228 	return h;
1229 }
1230 
1231 static Rune left1[] =  { '{', '[', '(', '<', 0xab, 0 };
1232 static Rune right1[] = { '}', ']', ')', '>', 0xbb, 0 };
1233 static Rune left2[] =  { '\n', 0 };
1234 static Rune left3[] =  { '\'', '"', '`', 0 };
1235 
1236 static
1237 Rune *left[] = {
1238 	left1,
1239 	left2,
1240 	left3,
1241 	nil
1242 };
1243 static
1244 Rune *right[] = {
1245 	right1,
1246 	left2,
1247 	left3,
1248 	nil
1249 };
1250 
1251 void
1252 textdoubleclick(Text *t, uint *q0, uint *q1)
1253 {
1254 	int c, i;
1255 	Rune *r, *l, *p;
1256 	uint q;
1257 
1258 	for(i=0; left[i]!=nil; i++){
1259 		q = *q0;
1260 		l = left[i];
1261 		r = right[i];
1262 		/* try matching character to left, looking right */
1263 		if(q == 0)
1264 			c = '\n';
1265 		else
1266 			c = textreadc(t, q-1);
1267 		p = runestrchr(l, c);
1268 		if(p != nil){
1269 			if(textclickmatch(t, c, r[p-l], 1, &q))
1270 				*q1 = q-(c!='\n');
1271 			return;
1272 		}
1273 		/* try matching character to right, looking left */
1274 		if(q == t->file->b.nc)
1275 			c = '\n';
1276 		else
1277 			c = textreadc(t, q);
1278 		p = runestrchr(r, c);
1279 		if(p != nil){
1280 			if(textclickmatch(t, c, l[p-r], -1, &q)){
1281 				*q1 = *q0+(*q0<t->file->b.nc && c=='\n');
1282 				*q0 = q;
1283 				if(c!='\n' || q!=0 || textreadc(t, 0)=='\n')
1284 					(*q0)++;
1285 			}
1286 			return;
1287 		}
1288 	}
1289 	/* try filling out word to right */
1290 	while(*q1<t->file->b.nc && isalnum(textreadc(t, *q1)))
1291 		(*q1)++;
1292 	/* try filling out word to left */
1293 	while(*q0>0 && isalnum(textreadc(t, *q0-1)))
1294 		(*q0)--;
1295 }
1296 
1297 int
1298 textclickmatch(Text *t, int cl, int cr, int dir, uint *q)
1299 {
1300 	Rune c;
1301 	int nest;
1302 
1303 	nest = 1;
1304 	for(;;){
1305 		if(dir > 0){
1306 			if(*q == t->file->b.nc)
1307 				break;
1308 			c = textreadc(t, *q);
1309 			(*q)++;
1310 		}else{
1311 			if(*q == 0)
1312 				break;
1313 			(*q)--;
1314 			c = textreadc(t, *q);
1315 		}
1316 		if(c == cr){
1317 			if(--nest==0)
1318 				return 1;
1319 		}else if(c == cl)
1320 			nest++;
1321 	}
1322 	return cl=='\n' && nest==1;
1323 }
1324 
1325 uint
1326 textbacknl(Text *t, uint p, uint n)
1327 {
1328 	int i, j;
1329 
1330 	/* look for start of this line if n==0 */
1331 	if(n==0 && p>0 && textreadc(t, p-1)!='\n')
1332 		n = 1;
1333 	i = n;
1334 	while(i-->0 && p>0){
1335 		--p;	/* it's at a newline now; back over it */
1336 		if(p == 0)
1337 			break;
1338 		/* at 128 chars, call it a line anyway */
1339 		for(j=128; --j>0 && p>0; p--)
1340 			if(textreadc(t, p-1)=='\n')
1341 				break;
1342 	}
1343 	return p;
1344 }
1345 
1346 void
1347 textsetorigin(Text *t, uint org, int exact)
1348 {
1349 	int i, a, fixup;
1350 	Rune *r;
1351 	uint n;
1352 
1353 	if(org>0 && !exact){
1354 		/* org is an estimate of the char posn; find a newline */
1355 		/* don't try harder than 256 chars */
1356 		for(i=0; i<256 && org<t->file->b.nc; i++){
1357 			if(textreadc(t, org) == '\n'){
1358 				org++;
1359 				break;
1360 			}
1361 			org++;
1362 		}
1363 	}
1364 	a = org-t->org;
1365 	fixup = 0;
1366 	if(a>=0 && a<t->fr.nchars){
1367 		frdelete(&t->fr, 0, a);
1368 		fixup = 1;	/* frdelete can leave end of last line in wrong selection mode; it doesn't know what follows */
1369 	}
1370 	else if(a<0 && -a<t->fr.nchars){
1371 		n = t->org - org;
1372 		r = runemalloc(n);
1373 		bufread(&t->file->b, org, r, n);
1374 		frinsert(&t->fr, r, r+n, 0);
1375 		free(r);
1376 	}else
1377 		frdelete(&t->fr, 0, t->fr.nchars);
1378 	t->org = org;
1379 	textfill(t);
1380 	textscrdraw(t);
1381 	textsetselect(t, t->q0, t->q1);
1382 	if(fixup && t->fr.p1 > t->fr.p0)
1383 		frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p1-1), t->fr.p1-1, t->fr.p1, 1);
1384 }
1385 
1386 void
1387 textreset(Text *t)
1388 {
1389 	t->file->seq = 0;
1390 	t->eq0 = ~0;
1391 	/* do t->delete(0, t->nc, TRUE) without building backup stuff */
1392 	textsetselect(t, t->org, t->org);
1393 	frdelete(&t->fr, 0, t->fr.nchars);
1394 	t->org = 0;
1395 	t->q0 = 0;
1396 	t->q1 = 0;
1397 	filereset(t->file);
1398 	bufreset(&t->file->b);
1399 }