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Date:: Fri Apr 16 05:11:34 2004 UTC
Message:: add rog's chording fix.
Actions:: History | Blame | Raw File
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;	/* 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 	fd = open(file, OREAD);
197 	if(fd < 0){
198 		warning(nil, "can't open %s: %r\n", file);
199 		return 0;
200 	}
201 	d = dirfstat(fd);
202 	if(d == nil){
203 		warning(nil, "can't fstat %s: %r\n", file);
204 		goto Rescue;
205 	}
206 	nulls = FALSE;
207 	if(d->qid.type & QTDIR){
208 		/* this is checked in get() but it's possible the file changed underfoot */
209 		if(t->file->ntext > 1){
210 			warning(nil, "%s is a directory; can't read with multiple windows on it\n", file);
211 			goto Rescue;
212 		}
213 		t->w->isdir = TRUE;
214 		t->w->filemenu = FALSE;
215 		if(t->file->name[t->file->nname-1] != '/'){
216 			rp = runemalloc(t->file->nname+1);
217 			runemove(rp, t->file->name, t->file->nname);
218 			rp[t->file->nname] = '/';
219 			winsetname(t->w, rp, t->file->nname+1);
220 			free(rp);
221 		}
222 		dlp = nil;
223 		ndl = 0;
224 		dbuf = nil;
225 		while((n=dirread(fd, &dbuf)) > 0){
226 			for(i=0; i<n; i++){
227 				if(nodotfiles && dbuf[i].name[0] == '.')
228 					continue;
229 				dl = emalloc(sizeof(Dirlist));
230 				j = strlen(dbuf[i].name);
231 				tmp = emalloc(j+1+1);
232 				memmove(tmp, dbuf[i].name, j);
233 				if(dbuf[i].qid.type & QTDIR)
234 					tmp[j++] = '/';
235 				tmp[j] = '\0';
236 				dl->r = bytetorune(tmp, &dl->nr);
237 				dl->wid = stringwidth(t->fr.font, tmp);
238 				free(tmp);
239 				ndl++;
240 				dlp = realloc(dlp, ndl*sizeof(Dirlist*));
241 				dlp[ndl-1] = dl;
242 			}
243 			free(dbuf);
244 		}
245 		qsort(dlp, ndl, sizeof(Dirlist*), dircmp);
246 		t->w->dlp = dlp;
247 		t->w->ndl = ndl;
248 		textcolumnate(t, dlp, ndl);
249 		q1 = t->file->b.nc;
250 	}else{
251 		t->w->isdir = FALSE;
252 		t->w->filemenu = TRUE;
253 		q1 = q0 + fileload(t->file, q0, fd, &nulls);
254 	}
255 	if(setqid){
256 		t->file->dev = d->dev;
257 		t->file->mtime = d->mtime;
258 		t->file->qidpath = d->qid.path;
259 	}
260 	close(fd);
261 	rp = fbufalloc();
262 	for(q=q0; q<q1; q+=n){
263 		n = q1-q;
264 		if(n > RBUFSIZE)
265 			n = RBUFSIZE;
266 		bufread(&t->file->b, q, rp, n);
267 		if(q < t->org)
268 			t->org += n;
269 		else if(q <= t->org+t->fr.nchars)
270 			frinsert(&t->fr, rp, rp+n, q-t->org);
271 		if(t->fr.lastlinefull)
272 			break;
273 	}
274 	fbuffree(rp);
275 	for(i=0; i<t->file->ntext; i++){
276 		u = t->file->text[i];
277 		if(u != t){
278 			if(u->org > u->file->b.nc)	/* will be 0 because of reset(), but safety first */
279 				u->org = 0;
280 			textresize(u, u->all);
281 			textbacknl(u, u->org, 0);	/* go to beginning of line */
282 		}
283 		textsetselect(u, q0, q0);
284 	}
285 	if(nulls)
286 		warning(nil, "%s: NUL bytes elided\n", file);
287 	free(d);
288 	return q1-q0;
289 
290     Rescue:
291 	close(fd);
292 	return 0;
293 }
294 
295 uint
296 textbsinsert(Text *t, uint q0, Rune *r, uint n, int tofile, int *nrp)
297 {
298 	Rune *bp, *tp, *up;
299 	int i, initial;
300 
301 	if(t->what == Tag){	/* can't happen but safety first: mustn't backspace over file name */
302     Err:
303 		textinsert(t, q0, r, n, tofile);
304 		*nrp = n;
305 		return q0;
306 	}
307 	bp = r;
308 	for(i=0; i<n; i++)
309 		if(*bp++ == '\b'){
310 			--bp;
311 			initial = 0;
312 			tp = runemalloc(n);
313 			runemove(tp, r, i);
314 			up = tp+i;
315 			for(; i<n; i++){
316 				*up = *bp++;
317 				if(*up == '\b')
318 					if(up == tp)
319 						initial++;
320 					else
321 						--up;
322 				else
323 					up++;
324 			}
325 			if(initial){
326 				if(initial > q0)
327 					initial = q0;
328 				q0 -= initial;
329 				textdelete(t, q0, q0+initial, tofile);
330 			}
331 			n = up-tp;
332 			textinsert(t, q0, tp, n, tofile);
333 			free(tp);
334 			*nrp = n;
335 			return q0;
336 		}
337 	goto Err;
338 }
339 
340 void
341 textinsert(Text *t, uint q0, Rune *r, uint n, int tofile)
342 {
343 	int c, i;
344 	Text *u;
345 
346 	if(tofile && t->ncache != 0)
347 		error("text.insert");
348 	if(n == 0)
349 		return;
350 	if(tofile){
351 		fileinsert(t->file, q0, r, n);
352 		if(t->what == Body){
353 			t->w->dirty = TRUE;
354 			t->w->utflastqid = -1;
355 		}
356 		if(t->file->ntext > 1)
357 			for(i=0; i<t->file->ntext; i++){
358 				u = t->file->text[i];
359 				if(u != t){
360 					u->w->dirty = TRUE;	/* always a body */
361 					textinsert(u, q0, r, n, FALSE);
362 					textsetselect(u, u->q0, u->q1);
363 					textscrdraw(u);
364 				}
365 			}
366 					
367 	}
368 	if(q0 < t->q1)
369 		t->q1 += n;
370 	if(q0 < t->q0)
371 		t->q0 += n;
372 	if(q0 < t->org)
373 		t->org += n;
374 	else if(q0 <= t->org+t->fr.nchars)
375 		frinsert(&t->fr, r, r+n, q0-t->org);
376 	if(t->w){
377 		c = 'i';
378 		if(t->what == Body)
379 			c = 'I';
380 		if(n <= EVENTSIZE)
381 			winevent(t->w, "%c%d %d 0 %d %.*S\n", c, q0, q0+n, n, n, r);
382 		else
383 			winevent(t->w, "%c%d %d 0 0 \n", c, q0, q0+n, n);
384 	}
385 }
386 
387 
388 void
389 textfill(Text *t)
390 {
391 	Rune *rp;
392 	int i, n, m, nl;
393 
394 	if(t->fr.lastlinefull || t->nofill)
395 		return;
396 	if(t->ncache > 0){
397 		if(t->w != nil)
398 			wincommit(t->w, t);
399 		else
400 			textcommit(t, TRUE);
401 	}
402 	rp = fbufalloc();
403 	do{
404 		n = t->file->b.nc-(t->org+t->fr.nchars);
405 		if(n == 0)
406 			break;
407 		if(n > 2000)	/* educated guess at reasonable amount */
408 			n = 2000;
409 		bufread(&t->file->b, t->org+t->fr.nchars, rp, n);
410 		/*
411 		 * it's expensive to frinsert more than we need, so
412 		 * count newlines.
413 		 */
414 		nl = t->fr.maxlines-t->fr.nlines;
415 		m = 0;
416 		for(i=0; i<n; ){
417 			if(rp[i++] == '\n'){
418 				m++;
419 				if(m >= nl)
420 					break;
421 			}
422 		}
423 		frinsert(&t->fr, rp, rp+i, t->fr.nchars);
424 	}while(t->fr.lastlinefull == FALSE);
425 	fbuffree(rp);
426 }
427 
428 void
429 textdelete(Text *t, uint q0, uint q1, int tofile)
430 {
431 	uint n, p0, p1;
432 	int i, c;
433 	Text *u;
434 
435 	if(tofile && t->ncache != 0)
436 		error("text.delete");
437 	n = q1-q0;
438 	if(n == 0)
439 		return;
440 	if(tofile){
441 		filedelete(t->file, q0, q1);
442 		if(t->what == Body){
443 			t->w->dirty = TRUE;
444 			t->w->utflastqid = -1;
445 		}
446 		if(t->file->ntext > 1)
447 			for(i=0; i<t->file->ntext; i++){
448 				u = t->file->text[i];
449 				if(u != t){
450 					u->w->dirty = TRUE;	/* always a body */
451 					textdelete(u, q0, q1, FALSE);
452 					textsetselect(u, u->q0, u->q1);
453 					textscrdraw(u);
454 				}
455 			}
456 	}
457 	if(q0 < t->q0)
458 		t->q0 -= min(n, t->q0-q0);
459 	if(q0 < t->q1)
460 		t->q1 -= min(n, t->q1-q0);
461 	if(q1 <= t->org)
462 		t->org -= n;
463 	else if(q0 < t->org+t->fr.nchars){
464 		p1 = q1 - t->org;
465 		if(p1 > t->fr.nchars)
466 			p1 = t->fr.nchars;
467 		if(q0 < t->org){
468 			t->org = q0;
469 			p0 = 0;
470 		}else
471 			p0 = q0 - t->org;
472 		frdelete(&t->fr, p0, p1);
473 		textfill(t);
474 	}
475 	if(t->w){
476 		c = 'd';
477 		if(t->what == Body)
478 			c = 'D';
479 		winevent(t->w, "%c%d %d 0 0 \n", c, q0, q1);
480 	}
481 }
482 
483 void
484 textconstrain(Text *t, uint q0, uint q1, uint *p0, uint *p1)
485 {
486 	*p0 = min(q0, t->file->b.nc);
487 	*p1 = min(q1, t->file->b.nc);
488 }
489 
490 Rune
491 textreadc(Text *t, uint q)
492 {
493 	Rune r;
494 
495 	if(t->cq0<=q && q<t->cq0+t->ncache)
496 		r = t->cache[q-t->cq0];
497 	else
498 		bufread(&t->file->b, q, &r, 1);
499 	return r;
500 }
501 
502 int
503 textbswidth(Text *t, Rune c)
504 {
505 	uint q, eq;
506 	Rune r;
507 	int skipping;
508 
509 	/* there is known to be at least one character to erase */
510 	if(c == 0x08)	/* ^H: erase character */
511 		return 1;
512 	q = t->q0;
513 	skipping = TRUE;
514 	while(q > 0){
515 		r = textreadc(t, q-1);
516 		if(r == '\n'){		/* eat at most one more character */
517 			if(q == t->q0)	/* eat the newline */
518 				--q;
519 			break; 
520 		}
521 		if(c == 0x17){
522 			eq = isalnum(r);
523 			if(eq && skipping)	/* found one; stop skipping */
524 				skipping = FALSE;
525 			else if(!eq && !skipping)
526 				break;
527 		}
528 		--q;
529 	}
530 	return t->q0-q;
531 }
532 
533 int
534 textfilewidth(Text *t, uint q0, int oneelement)
535 {
536 	uint q;
537 	Rune r;
538 
539 	q = q0;
540 	while(q > 0){
541 		r = textreadc(t, q-1);
542 		if(r <= ' ')
543 			break;
544 		if(oneelement && r=='/')
545 			break;
546 		--q;
547 	}
548 	return q0-q;
549 }
550 
551 Rune*
552 textcomplete(Text *t)
553 {
554 	int i, nstr, npath;
555 	uint q;
556 	Rune tmp[200];
557 	Rune *str, *path;
558 	Rune *rp;
559 	Completion *c;
560 	char *s, *dirs;
561 	Runestr dir;
562 
563 	/* control-f: filename completion; works back to white space or / */
564 	if(t->q0<t->file->b.nc && textreadc(t, t->q0)>' ')	/* must be at end of word */
565 		return nil;
566 	nstr = textfilewidth(t, t->q0, TRUE);
567 	str = runemalloc(nstr);
568 	npath = textfilewidth(t, t->q0-nstr, FALSE);
569 	path = runemalloc(npath);
570 
571 	c = nil;
572 	rp = nil;
573 	dirs = nil;
574 
575 	q = t->q0-nstr;
576 	for(i=0; i<nstr; i++)
577 		str[i] = textreadc(t, q++);
578 	q = t->q0-nstr-npath;
579 	for(i=0; i<npath; i++)
580 		path[i] = textreadc(t, q++);
581 	/* is path rooted? if not, we need to make it relative to window path */
582 	if(npath>0 && path[0]=='/')
583 		dir = runestr(path, npath);
584 	else{
585 		dir = dirname(t, nil, 0);
586 		if(dir.nr + 1 + npath > nelem(tmp)){
587 			free(dir.r);
588 			goto Return;
589 		}
590 		if(dir.nr == 0){
591 			dir.nr = 1;
592 			dir.r = runestrdup(Ldot);
593 		}
594 		runemove(tmp, dir.r, dir.nr);
595 		tmp[dir.nr] = '/';
596 		runemove(tmp+dir.nr+1, path, npath);
597 		free(dir.r);
598 		dir.r = tmp;
599 		dir.nr += 1+npath;
600 		dir = cleanrname(dir);
601 	}
602 
603 	s = smprint("%.*S", nstr, str);
604 	dirs = smprint("%.*S", dir.nr, dir.r);
605 	c = complete(dirs, s);
606 	free(s);
607 	if(c == nil){
608 		warning(nil, "error attempting completion: %r\n");
609 		goto Return;
610 	}
611 
612 	if(!c->advance){
613 		warning(nil, "%.*S%s%.*S*%s\n",
614 			dir.nr, dir.r,
615 			dir.nr>0 && dir.r[dir.nr-1]!='/' ? "/" : "",
616 			nstr, str,
617 			c->nmatch ? "" : ": no matches in:");
618 		for(i=0; i<c->nfile; i++)
619 			warning(nil, " %s\n", c->filename[i]);
620 	}
621 
622 	if(c->advance)
623 		rp = runesmprint("%s", c->string);
624 	else
625 		rp = nil;
626   Return:
627 	freecompletion(c);
628 	free(dirs);
629 	free(str);
630 	free(path);
631 	return rp;
632 }
633 
634 void
635 texttype(Text *t, Rune r)
636 {
637 	uint q0, q1;
638 	int nnb, nb, n, i;
639 	int nr;
640 	Rune *rp;
641 	Text *u;
642 
643 	if(t->what!=Body && r=='\n')
644 		return;
645 	nr = 1;
646 	rp = &r;
647 	switch(r){
648 	case Kleft:
649 		if(t->q0 > 0){
650 			textcommit(t, TRUE);
651 			textshow(t, t->q0-1, t->q0-1, TRUE);
652 		}
653 		return;
654 	case Kright:
655 		if(t->q1 < t->file->b.nc){
656 			textcommit(t, TRUE);
657 			textshow(t, t->q1+1, t->q1+1, TRUE);
658 		}
659 		return;
660 	case Kdown:
661 		n = t->fr.maxlines/3;
662 		goto case_Down;
663 	case Kpgdown:
664 		n = 2*t->fr.maxlines/3;
665 	case_Down:
666 		q0 = t->org+frcharofpt(&t->fr, Pt(t->fr.r.min.x, t->fr.r.min.y+n*t->fr.font->height));
667 		textsetorigin(t, q0, FALSE);
668 		return;
669 	case Kup:
670 		n = t->fr.maxlines/3;
671 		goto case_Up;
672 	case Kpgup:
673 		n = 2*t->fr.maxlines/3;
674 	case_Up:
675 		q0 = textbacknl(t, t->org, n);
676 		textsetorigin(t, q0, FALSE);
677 		return;
678 	case Khome:
679 		textshow(t, 0, 0, FALSE);
680 		return;
681 	case Kend:
682 		if(t->w)
683 			wincommit(t->w, t);
684 		else
685 			textcommit(t, TRUE);
686 		textshow(t, t->file->b.nc, t->file->b.nc, FALSE);
687 		return;
688 	}
689 	if(t->what == Body){
690 		seq++;
691 		filemark(t->file);
692 	}
693 	if(t->q1 > t->q0){
694 		if(t->ncache != 0)
695 			error("text.type");
696 		cut(t, t, nil, TRUE, TRUE, nil, 0);
697 		t->eq0 = ~0;
698 	}
699 	textshow(t, t->q0, t->q0, 1);
700 	switch(r){
701 	case 0x06:	/* ^F: complete */
702 	case Kins:
703 		rp = textcomplete(t);
704 		if(rp == nil)
705 			return;
706 		nr = runestrlen(rp);
707 		break;	/* fall through to normal insertion case */
708 	case 0x1B:
709 		if(t->eq0 != ~0)
710 			textsetselect(t, t->eq0, t->q0);
711 		if(t->ncache > 0){
712 			if(t->w != nil)
713 				wincommit(t->w, t);
714 			else
715 				textcommit(t, TRUE);
716 		}
717 		return;
718 	case 0x08:	/* ^H: erase character */
719 	case 0x15:	/* ^U: erase line */
720 	case 0x17:	/* ^W: erase word */
721 		if(t->q0 == 0)	/* nothing to erase */
722 			return;
723 		nnb = textbswidth(t, r);
724 		q1 = t->q0;
725 		q0 = q1-nnb;
726 		/* if selection is at beginning of window, avoid deleting invisible text */
727 		if(q0 < t->org){
728 			q0 = t->org;
729 			nnb = q1-q0;
730 		}
731 		if(nnb <= 0)
732 			return;
733 		for(i=0; i<t->file->ntext; i++){
734 			u = t->file->text[i];
735 			u->nofill = TRUE;
736 			nb = nnb;
737 			n = u->ncache;
738 			if(n > 0){
739 				if(q1 != u->cq0+n)
740 					error("text.type backspace");
741 				if(n > nb)
742 					n = nb;
743 				u->ncache -= n;
744 				textdelete(u, q1-n, q1, FALSE);
745 				nb -= n;
746 			}
747 			if(u->eq0==q1 || u->eq0==~0)
748 				u->eq0 = q0;
749 			if(nb && u==t)
750 				textdelete(u, q0, q0+nb, TRUE);
751 			if(u != t)
752 				textsetselect(u, u->q0, u->q1);
753 			else
754 				textsetselect(t, q0, q0);
755 			u->nofill = FALSE;
756 		}
757 		for(i=0; i<t->file->ntext; i++)
758 			textfill(t->file->text[i]);
759 		return;
760 	case '\n':
761 		if(t->w->autoindent){
762 			/* find beginning of previous line using backspace code */
763 			nnb = textbswidth(t, 0x15); /* ^U case */
764 			rp = runemalloc(nnb + 1);
765 			nr = 0;
766 			rp[nr++] = r;
767 			for(i=0; i<nnb; i++){
768 				r = textreadc(t, t->q0-nnb+i);
769 				if(r != ' ' && r != '\t')
770 					break;
771 				rp[nr++] = r;
772 			}
773 		}
774 		break; /* fall through to normal code */
775 	}
776 	/* otherwise ordinary character; just insert, typically in caches of all texts */
777 	for(i=0; i<t->file->ntext; i++){
778 		u = t->file->text[i];
779 		if(u->eq0 == ~0)
780 			u->eq0 = t->q0;
781 		if(u->ncache == 0)
782 			u->cq0 = t->q0;
783 		else if(t->q0 != u->cq0+u->ncache)
784 			error("text.type cq1");
785 		textinsert(u, t->q0, rp, nr, FALSE);
786 		if(u != t)
787 			textsetselect(u, u->q0, u->q1);
788 		if(u->ncache+nr > u->ncachealloc){
789 			u->ncachealloc += 10 + nr;
790 			u->cache = runerealloc(u->cache, u->ncachealloc);
791 		}
792 		runemove(u->cache+u->ncache, rp, nr);
793 		u->ncache += nr;
794 	}
795 	if(rp != &r)
796 		free(rp);
797 	textsetselect(t, t->q0+nr, t->q0+nr);
798 	if(r=='\n' && t->w!=nil)
799 		wincommit(t->w, t);
800 }
801 
802 void
803 textcommit(Text *t, int tofile)
804 {
805 	if(t->ncache == 0)
806 		return;
807 	if(tofile)
808 		fileinsert(t->file, t->cq0, t->cache, t->ncache);
809 	if(t->what == Body){
810 		t->w->dirty = TRUE;
811 		t->w->utflastqid = -1;
812 	}
813 	t->ncache = 0;
814 }
815 
816 static	Text	*clicktext;
817 static	uint	clickmsec;
818 static	Text	*selecttext;
819 static	uint	selectq;
820 
821 /*
822  * called from frame library
823  */
824 void
825 framescroll(Frame *f, int dl)
826 {
827 	if(f != &selecttext->fr)
828 		error("frameselect not right frame");
829 	textframescroll(selecttext, dl);
830 }
831 
832 void
833 textframescroll(Text *t, int dl)
834 {
835 	uint q0;
836 
837 	if(dl == 0){
838 		scrsleep(100);
839 		return;
840 	}
841 	if(dl < 0){
842 		q0 = textbacknl(t, t->org, -dl);
843 		if(selectq > t->org+t->fr.p0)
844 			textsetselect(t, t->org+t->fr.p0, selectq);
845 		else
846 			textsetselect(t, selectq, t->org+t->fr.p0);
847 	}else{
848 		if(t->org+t->fr.nchars == t->file->b.nc)
849 			return;
850 		q0 = t->org+frcharofpt(&t->fr, Pt(t->fr.r.min.x, t->fr.r.min.y+dl*t->fr.font->height));
851 		if(selectq > t->org+t->fr.p1)
852 			textsetselect(t, t->org+t->fr.p1, selectq);
853 		else
854 			textsetselect(t, selectq, t->org+t->fr.p1);
855 	}
856 	textsetorigin(t, q0, TRUE);
857 }
858 
859 
860 void
861 textselect(Text *t)
862 {
863 	uint q0, q1;
864 	int b, x, y;
865 	int state, op;
866 
867 	selecttext = t;
868 	/*
869 	 * To have double-clicking and chording, we double-click
870 	 * immediately if it might make sense.
871 	 */
872 	b = mouse->buttons;
873 	q0 = t->q0;
874 	q1 = t->q1;
875 	selectq = t->org+frcharofpt(&t->fr, mouse->xy);
876 	if(clicktext==t && mouse->msec-clickmsec<500)
877 	if(q0==q1 && selectq==q0){
878 		textdoubleclick(t, &q0, &q1);
879 		textsetselect(t, q0, q1);
880 		flushimage(display, 1);
881 		x = mouse->xy.x;
882 		y = mouse->xy.y;
883 		/* stay here until something interesting happens */
884 		do
885 			readmouse(mousectl);
886 		while(mouse->buttons==b && abs(mouse->xy.x-x)<3 && abs(mouse->xy.y-y)<3);
887 		mouse->xy.x = x;	/* in case we're calling frselect */
888 		mouse->xy.y = y;
889 		q0 = t->q0;	/* may have changed */
890 		q1 = t->q1;
891 		selectq = q0;
892 	}
893 	if(mouse->buttons == b){
894 		t->fr.scroll = framescroll;
895 		frselect(&t->fr, mousectl);
896 		/* horrible botch: while asleep, may have lost selection altogether */
897 		if(selectq > t->file->b.nc)
898 			selectq = t->org + t->fr.p0;
899 		t->fr.scroll = 0;
900 		if(selectq < t->org)
901 			q0 = selectq;
902 		else
903 			q0 = t->org + t->fr.p0;
904 		if(selectq > t->org+t->fr.nchars)
905 			q1 = selectq;
906 		else
907 			q1 = t->org+t->fr.p1;
908 	}
909 	if(q0 == q1){
910 		if(q0==t->q0 && clicktext==t && mouse->msec-clickmsec<500){
911 			textdoubleclick(t, &q0, &q1);
912 			clicktext = nil;
913 		}else{
914 			clicktext = t;
915 			clickmsec = mouse->msec;
916 		}
917 	}else
918 		clicktext = nil;
919 	textsetselect(t, q0, q1);
920 	flushimage(display, 1);
921 	state = op = 0;	/* undo when possible; +1 for cut, -1 for paste */
922 	while(mouse->buttons){
923 		mouse->msec = 0;
924 		b = mouse->buttons;
925 		if(b & 6){
926 			if(state==0 && op==0 && t->what==Body){
927 				seq++;
928 				filemark(t->w->body.file);
929 			}
930 			if(b & 2){
931 				if(state==-1 && t->what==Body){
932 					winundo(t->w, TRUE);
933 					textsetselect(t, q0, t->q0);
934 					state = 0;
935 				}else if(state != 1 && op != -1){
936 					cut(t, t, nil, TRUE, TRUE, nil, 0);
937 					op = state = 1;
938 				}
939 			}else{
940 				if(state==1 && t->what==Body){
941 					winundo(t->w, TRUE);
942 					textsetselect(t, q0, t->q1);
943 					state = 0;
944 				}else if(state != -1 && op != 1){
945 					paste(t, t, nil, TRUE, FALSE, nil, 0);
946 					op = state = -1;
947 				}
948 			}
949 			textscrdraw(t);
950 			clearmouse();
951 		}
952 		flushimage(display, 1);
953 		while(mouse->buttons == b)
954 			readmouse(mousectl);
955 		clicktext = nil;
956 	}
957 }
958 
959 void
960 textshow(Text *t, uint q0, uint q1, int doselect)
961 {
962 	int qe;
963 	int nl;
964 	uint q;
965 
966 	if(t->what != Body)
967 		return;
968 	if(t->w!=nil && t->fr.maxlines==0)
969 		colgrow(t->col, t->w, 1);
970 	if(doselect)
971 		textsetselect(t, q0, q1);
972 	qe = t->org+t->fr.nchars;
973 	if(t->org<=q0 && (q0<qe || (q0==qe && qe==t->file->b.nc+t->ncache)))
974 		textscrdraw(t);
975 	else{
976 		if(t->w->nopen[QWevent] > 0)
977 			nl = 3*t->fr.maxlines/4;
978 		else
979 			nl = t->fr.maxlines/4;
980 		q = textbacknl(t, q0, nl);
981 		/* avoid going backwards if trying to go forwards - long lines! */
982 		if(!(q0>t->org && q<t->org))
983 			textsetorigin(t, q, TRUE);
984 		while(q0 > t->org+t->fr.nchars)
985 			textsetorigin(t, t->org+1, FALSE);
986 	}
987 }
988 
989 static
990 int
991 region(int a, int b)
992 {
993 	if(a < b)
994 		return -1;
995 	if(a == b)
996 		return 0;
997 	return 1;
998 }
999 
1000 void
1001 selrestore(Frame *f, Point pt0, uint p0, uint p1)
1002 {
1003 	if(p1<=f->p0 || p0>=f->p1){
1004 		/* no overlap */
1005 		frdrawsel0(f, pt0, p0, p1, f->cols[BACK], f->cols[TEXT]);
1006 		return;
1007 	}
1008 	if(p0>=f->p0 && p1<=f->p1){
1009 		/* entirely inside */
1010 		frdrawsel0(f, pt0, p0, p1, f->cols[HIGH], f->cols[HTEXT]);
1011 		return;
1012 	}
1013 
1014 	/* they now are known to overlap */
1015 
1016 	/* before selection */
1017 	if(p0 < f->p0){
1018 		frdrawsel0(f, pt0, p0, f->p0, f->cols[BACK], f->cols[TEXT]);
1019 		p0 = f->p0;
1020 		pt0 = frptofchar(f, p0);
1021 	}
1022 	/* after selection */
1023 	if(p1 > f->p1){
1024 		frdrawsel0(f, frptofchar(f, f->p1), f->p1, p1, f->cols[BACK], f->cols[TEXT]);
1025 		p1 = f->p1;
1026 	}
1027 	/* inside selection */
1028 	frdrawsel0(f, pt0, p0, p1, f->cols[HIGH], f->cols[HTEXT]);
1029 }
1030 
1031 void
1032 textsetselect(Text *t, uint q0, uint q1)
1033 {
1034 	int p0, p1;
1035 
1036 	/* t->fr.p0 and t->fr.p1 are always right; t->q0 and t->q1 may be off */
1037 	t->q0 = q0;
1038 	t->q1 = q1;
1039 	/* compute desired p0,p1 from q0,q1 */
1040 	p0 = q0-t->org;
1041 	p1 = q1-t->org;
1042 	if(p0 < 0)
1043 		p0 = 0;
1044 	if(p1 < 0)
1045 		p1 = 0;
1046 	if(p0 > t->fr.nchars)
1047 		p0 = t->fr.nchars;
1048 	if(p1 > t->fr.nchars)
1049 		p1 = t->fr.nchars;
1050 	if(p0==t->fr.p0 && p1==t->fr.p1)
1051 		return;
1052 	/* screen disagrees with desired selection */
1053 	if(t->fr.p1<=p0 || p1<=t->fr.p0 || p0==p1 || t->fr.p1==t->fr.p0){
1054 		/* no overlap or too easy to bother trying */
1055 		frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p0), t->fr.p0, t->fr.p1, 0);
1056 		frdrawsel(&t->fr, frptofchar(&t->fr, p0), p0, p1, 1);
1057 		goto Return;
1058 	}
1059 	/* overlap; avoid unnecessary painting */
1060 	if(p0 < t->fr.p0){
1061 		/* extend selection backwards */
1062 		frdrawsel(&t->fr, frptofchar(&t->fr, p0), p0, t->fr.p0, 1);
1063 	}else if(p0 > t->fr.p0){
1064 		/* trim first part of selection */
1065 		frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p0), t->fr.p0, p0, 0);
1066 	}
1067 	if(p1 > t->fr.p1){
1068 		/* extend selection forwards */
1069 		frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p1), t->fr.p1, p1, 1);
1070 	}else if(p1 < t->fr.p1){
1071 		/* trim last part of selection */
1072 		frdrawsel(&t->fr, frptofchar(&t->fr, p1), p1, t->fr.p1, 0);
1073 	}
1074 
1075     Return:
1076 	t->fr.p0 = p0;
1077 	t->fr.p1 = p1;
1078 }
1079 
1080 /*
1081  * Release the button in less than DELAY ms and it's considered a null selection
1082  * if the mouse hardly moved, regardless of whether it crossed a char boundary.
1083  */
1084 enum {
1085 	DELAY = 2,
1086 	MINMOVE = 4,
1087 };
1088 
1089 uint
1090 xselect(Frame *f, Mousectl *mc, Image *col, uint *p1p)	/* when called, button is down */
1091 {
1092 	uint p0, p1, q, tmp;
1093 	ulong msec;
1094 	Point mp, pt0, pt1, qt;
1095 	int reg, b;
1096 
1097 	mp = mc->m.xy;
1098 	b = mc->m.buttons;
1099 	msec = mc->m.msec;
1100 
1101 	/* remove tick */
1102 	if(f->p0 == f->p1)
1103 		frtick(f, frptofchar(f, f->p0), 0);
1104 	p0 = p1 = frcharofpt(f, mp);
1105 	pt0 = frptofchar(f, p0);
1106 	pt1 = frptofchar(f, p1);
1107 	reg = 0;
1108 	frtick(f, pt0, 1);
1109 	do{
1110 		q = frcharofpt(f, mc->m.xy);
1111 		if(p1 != q){
1112 			if(p0 == p1)
1113 				frtick(f, pt0, 0);
1114 			if(reg != region(q, p0)){	/* crossed starting point; reset */
1115 				if(reg > 0)
1116 					selrestore(f, pt0, p0, p1);
1117 				else if(reg < 0)
1118 					selrestore(f, pt1, p1, p0);
1119 				p1 = p0;
1120 				pt1 = pt0;
1121 				reg = region(q, p0);
1122 				if(reg == 0)
1123 					frdrawsel0(f, pt0, p0, p1, col, display->white);
1124 			}
1125 			qt = frptofchar(f, q);
1126 			if(reg > 0){
1127 				if(q > p1)
1128 					frdrawsel0(f, pt1, p1, q, col, display->white);
1129 
1130 				else if(q < p1)
1131 					selrestore(f, qt, q, p1);
1132 			}else if(reg < 0){
1133 				if(q > p1)
1134 					selrestore(f, pt1, p1, q);
1135 				else
1136 					frdrawsel0(f, qt, q, p1, col, display->white);
1137 			}
1138 			p1 = q;
1139 			pt1 = qt;
1140 		}
1141 		if(p0 == p1)
1142 			frtick(f, pt0, 1);
1143 		flushimage(f->display, 1);
1144 		readmouse(mc);
1145 	}while(mc->m.buttons == b);
1146 	if(mc->m.msec-msec < DELAY && p0!=p1
1147 	&& abs(mp.x-mc->m.xy.x)<MINMOVE
1148 	&& abs(mp.y-mc->m.xy.y)<MINMOVE) {
1149 		if(reg > 0)
1150 			selrestore(f, pt0, p0, p1);
1151 		else if(reg < 0)
1152 			selrestore(f, pt1, p1, p0);
1153 		p1 = p0;
1154 	}
1155 	if(p1 < p0){
1156 		tmp = p0;
1157 		p0 = p1;
1158 		p1 = tmp;
1159 	}
1160 	pt0 = frptofchar(f, p0);
1161 	if(p0 == p1)
1162 		frtick(f, pt0, 0);
1163 	selrestore(f, pt0, p0, p1);
1164 	/* restore tick */
1165 	if(f->p0 == f->p1)
1166 		frtick(f, frptofchar(f, f->p0), 1);
1167 	flushimage(f->display, 1);
1168 	*p1p = p1;
1169 	return p0;
1170 }
1171 
1172 int
1173 textselect23(Text *t, uint *q0, uint *q1, Image *high, int mask)
1174 {
1175 	uint p0, p1;
1176 	int buts;
1177 	
1178 	p0 = xselect(&t->fr, mousectl, high, &p1);
1179 	buts = mousectl->m.buttons;
1180 	if((buts & mask) == 0){
1181 		*q0 = p0+t->org;
1182 		*q1 = p1+t->org;
1183 	}
1184 
1185 	while(mousectl->m.buttons)
1186 		readmouse(mousectl);
1187 	return buts;
1188 }
1189 
1190 int
1191 textselect2(Text *t, uint *q0, uint *q1, Text **tp)
1192 {
1193 	int buts;
1194 
1195 	*tp = nil;
1196 	buts = textselect23(t, q0, q1, but2col, 4);
1197 	if(buts & 4)
1198 		return 0;
1199 	if(buts & 1){	/* pick up argument */
1200 		*tp = argtext;
1201 		return 1;
1202 	}
1203 	return 1;
1204 }
1205 
1206 int
1207 textselect3(Text *t, uint *q0, uint *q1)
1208 {
1209 	int h;
1210 
1211 	h = (textselect23(t, q0, q1, but3col, 1|2) == 0);
1212 	return h;
1213 }
1214 
1215 static Rune left1[] =  { '{', '[', '(', '<', 0xab, 0 };
1216 static Rune right1[] = { '}', ']', ')', '>', 0xbb, 0 };
1217 static Rune left2[] =  { '\n', 0 };
1218 static Rune left3[] =  { '\'', '"', '`', 0 };
1219 
1220 static
1221 Rune *left[] = {
1222 	left1,
1223 	left2,
1224 	left3,
1225 	nil
1226 };
1227 static
1228 Rune *right[] = {
1229 	right1,
1230 	left2,
1231 	left3,
1232 	nil
1233 };
1234 
1235 void
1236 textdoubleclick(Text *t, uint *q0, uint *q1)
1237 {
1238 	int c, i;
1239 	Rune *r, *l, *p;
1240 	uint q;
1241 
1242 	for(i=0; left[i]!=nil; i++){
1243 		q = *q0;
1244 		l = left[i];
1245 		r = right[i];
1246 		/* try matching character to left, looking right */
1247 		if(q == 0)
1248 			c = '\n';
1249 		else
1250 			c = textreadc(t, q-1);
1251 		p = runestrchr(l, c);
1252 		if(p != nil){
1253 			if(textclickmatch(t, c, r[p-l], 1, &q))
1254 				*q1 = q-(c!='\n');
1255 			return;
1256 		}
1257 		/* try matching character to right, looking left */
1258 		if(q == t->file->b.nc)
1259 			c = '\n';
1260 		else
1261 			c = textreadc(t, q);
1262 		p = runestrchr(r, c);
1263 		if(p != nil){
1264 			if(textclickmatch(t, c, l[p-r], -1, &q)){
1265 				*q1 = *q0+(*q0<t->file->b.nc && c=='\n');
1266 				*q0 = q;
1267 				if(c!='\n' || q!=0 || textreadc(t, 0)=='\n')
1268 					(*q0)++;
1269 			}
1270 			return;
1271 		}
1272 	}
1273 	/* try filling out word to right */
1274 	while(*q1<t->file->b.nc && isalnum(textreadc(t, *q1)))
1275 		(*q1)++;
1276 	/* try filling out word to left */
1277 	while(*q0>0 && isalnum(textreadc(t, *q0-1)))
1278 		(*q0)--;
1279 }
1280 
1281 int
1282 textclickmatch(Text *t, int cl, int cr, int dir, uint *q)
1283 {
1284 	Rune c;
1285 	int nest;
1286 
1287 	nest = 1;
1288 	for(;;){
1289 		if(dir > 0){
1290 			if(*q == t->file->b.nc)
1291 				break;
1292 			c = textreadc(t, *q);
1293 			(*q)++;
1294 		}else{
1295 			if(*q == 0)
1296 				break;
1297 			(*q)--;
1298 			c = textreadc(t, *q);
1299 		}
1300 		if(c == cr){
1301 			if(--nest==0)
1302 				return 1;
1303 		}else if(c == cl)
1304 			nest++;
1305 	}
1306 	return cl=='\n' && nest==1;
1307 }
1308 
1309 uint
1310 textbacknl(Text *t, uint p, uint n)
1311 {
1312 	int i, j;
1313 
1314 	/* look for start of this line if n==0 */
1315 	if(n==0 && p>0 && textreadc(t, p-1)!='\n')
1316 		n = 1;
1317 	i = n;
1318 	while(i-->0 && p>0){
1319 		--p;	/* it's at a newline now; back over it */
1320 		if(p == 0)
1321 			break;
1322 		/* at 128 chars, call it a line anyway */
1323 		for(j=128; --j>0 && p>0; p--)
1324 			if(textreadc(t, p-1)=='\n')
1325 				break;
1326 	}
1327 	return p;
1328 }
1329 
1330 void
1331 textsetorigin(Text *t, uint org, int exact)
1332 {
1333 	int i, a, fixup;
1334 	Rune *r;
1335 	uint n;
1336 
1337 	if(org>0 && !exact){
1338 		/* org is an estimate of the char posn; find a newline */
1339 		/* don't try harder than 256 chars */
1340 		for(i=0; i<256 && org<t->file->b.nc; i++){
1341 			if(textreadc(t, org) == '\n'){
1342 				org++;
1343 				break;
1344 			}
1345 			org++;
1346 		}
1347 	}
1348 	a = org-t->org;
1349 	fixup = 0;
1350 	if(a>=0 && a<t->fr.nchars){
1351 		frdelete(&t->fr, 0, a);
1352 		fixup = 1;	/* frdelete can leave end of last line in wrong selection mode; it doesn't know what follows */
1353 	}
1354 	else if(a<0 && -a<t->fr.nchars){
1355 		n = t->org - org;
1356 		r = runemalloc(n);
1357 		bufread(&t->file->b, org, r, n);
1358 		frinsert(&t->fr, r, r+n, 0);
1359 		free(r);
1360 	}else
1361 		frdelete(&t->fr, 0, t->fr.nchars);
1362 	t->org = org;
1363 	textfill(t);
1364 	textscrdraw(t);
1365 	textsetselect(t, t->q0, t->q1);
1366 	if(fixup && t->fr.p1 > t->fr.p0)
1367 		frdrawsel(&t->fr, frptofchar(&t->fr, t->fr.p1-1), t->fr.p1-1, t->fr.p1, 1);
1368 }
1369 
1370 void
1371 textreset(Text *t)
1372 {
1373 	t->file->seq = 0;
1374 	t->eq0 = ~0;
1375 	/* do t->delete(0, t->nc, TRUE) without building backup stuff */
1376 	textsetselect(t, t->org, t->org);
1377 	frdelete(&t->fr, 0, t->fr.nchars);
1378 	t->org = 0;
1379 	t->q0 = 0;
1380 	t->q1 = 0;
1381 	filereset(t->file);
1382 	bufreset(&t->file->b);
1383 }