1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "compat.h"
18 
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 
23 #include "minibuffer.h"
24 #include "session.h"
25 #include "ui.h"
26 #include "utf8.h"
27 #include "utils.h"
28 
29 static void		*minibuffer_metadata(void);
30 static void		 minibuffer_hist_save_entry(void);
31 static void		 yornp_self_insert(void);
32 static void		 yornp_abort(void);
33 static void		 read_self_insert(void);
34 static void		 read_abort(void);
35 static void		 read_select(void);
36 static void		 handle_clear_echoarea(int, short, void *);
37 
38 static struct event	clechoev;
39 static struct timeval	clechoev_timer = { 5, 0 };
40 
41 static void (*yornp_cb)(int, struct tab *);
42 static struct tab *yornp_data;
43 
44 static void (*read_cb)(const char*, struct tab *);
45 static struct tab *read_data;
46 
47 /* XXX: don't forget to init these in minibuffer_init */
48 struct histhead eecmd_history,
49 	ir_history,
50 	lu_history,
51 	read_history;
52 
53 struct ministate ministate;
54 
55 struct buffer minibufferwin;
56 
57 int in_minibuffer;
58 
59 /*
60  * Recompute the visible completions.  If add is 1, don't consider the
61  * ones already hidden.
62  */
63 void
64 recompute_completions(int add)
65 {
66 	struct line	*l;
67 	struct vline	*vl;
68 	struct buffer	*b;
69 
70 	if (in_minibuffer != MB_COMPREAD)
71 		return;
72 
73 	b = &ministate.compl.buffer;
74 	TAILQ_FOREACH(l, &b->page.head, lines) {
75 		l->type = LINE_COMPL;
76 		if (add && l->flags & L_HIDDEN)
77 			continue;
78 		if (strcasestr(l->line, ministate.buf) != NULL ||
79 		    (l->alt != NULL && strcasestr(l->alt, ministate.buf) != NULL)) {
80 			if (l->flags & L_HIDDEN)
81 				b->line_max++;
82 			l->flags &= ~L_HIDDEN;
83 		} else {
84 			if (!(l->flags & L_HIDDEN))
85 				b->line_max--;
86 			l->flags |= L_HIDDEN;
87 		}
88 	}
89 
90 	if (b->current_line == NULL)
91 		b->current_line = TAILQ_FIRST(&b->head);
92 	b->current_line = adjust_line(b->current_line, b);
93 	vl = b->current_line;
94 	if (vl != NULL)
95 		vl->parent->type = LINE_COMPL_CURRENT;
96 }
97 
98 int
99 minibuffer_insert_current_candidate(void)
100 {
101 	struct vline *vl;
102 
103 	vl = ministate.compl.buffer.current_line;
104 	if (vl == NULL || vl->parent->flags & L_HIDDEN)
105 		return -1;
106 
107 	minibuffer_taint_hist();
108 	strlcpy(ministate.buf, vl->parent->line, sizeof(ministate.buf));
109 	ministate.buffer.cpoff = utf8_cplen(ministate.buf);
110 
111 	return 0;
112 }
113 
114 static void *
115 minibuffer_metadata(void)
116 {
117 	struct vline	*vl;
118 
119 	vl = ministate.compl.buffer.current_line;
120 
121 	if (vl == NULL || vl->parent->flags & L_HIDDEN)
122 		return NULL;
123 
124 	return vl->parent->data;
125 }
126 
127 static void
128 minibuffer_hist_save_entry(void)
129 {
130 	struct hist	*hist;
131 
132 	if (ministate.history == NULL)
133 		return;
134 
135 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
136 		abort();
137 
138 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
139 
140 	TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
141 	ministate.history->len++;
142 }
143 
144 /*
145  * taint the minibuffer cache: if we're currently showing a history
146  * element, copy that to the current buf and reset the "history
147  * navigation" thing.
148  */
149 void
150 minibuffer_taint_hist(void)
151 {
152 	if (ministate.hist_cur == NULL)
153 		return;
154 
155 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
156 	ministate.hist_cur = NULL;
157 	ministate.buffer.current_line->line = ministate.buf;
158 }
159 
160 void
161 minibuffer_self_insert(void)
162 {
163 	char	*c, tmp[5] = {0};
164 	size_t	len;
165 
166 	minibuffer_taint_hist();
167 
168 	if (thiskey.cp == 0)
169 		return;
170 
171 	len = utf8_encode(thiskey.cp, tmp);
172 	c = utf8_nth(ministate.buffer.current_line->line, ministate.buffer.cpoff);
173 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
174 		return;
175 
176 	memmove(c + len, c, strlen(c)+1);
177 	memcpy(c, tmp, len);
178 	ministate.buffer.cpoff++;
179 
180 	recompute_completions(1);
181 }
182 
183 void
184 sensible_self_insert(void)
185 {
186 	if (thiskey.meta ||
187 	    (!unicode_isgraph(thiskey.key) && thiskey.key != ' ')) {
188 		global_key_unbound();
189 		return;
190 	}
191 
192 	minibuffer_self_insert();
193 }
194 
195 void
196 eecmd_select(void)
197 {
198 	struct cmd	*cmd;
199 	struct vline	*vl;
200 	const char	*t;
201 
202 	vl = ministate.compl.buffer.current_line;
203 	if (vl == NULL || vl->parent->flags & L_HIDDEN)
204 		goto end;
205 
206 	t = vl->parent->line;
207 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
208 		if (!strcmp(cmd->cmd, t)) {
209 			minibuffer_insert_current_candidate();
210 			exit_minibuffer();
211 			minibuffer_hist_save_entry();
212 			cmd->fn(current_buffer());
213 			return;
214 		}
215 	}
216 
217 end:
218 	message("No match");
219 }
220 
221 void
222 ir_select_gemini(void)
223 {
224 	char		 buf[1025] = {0};
225 	struct phos_uri	 uri;
226 	struct tab	*tab = current_tab;
227 
228 	exit_minibuffer();
229 	minibuffer_hist_save_entry();
230 
231 	/* a bit ugly but... */
232 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
233 	phos_uri_set_query(&uri, ministate.buf);
234 	phos_serialize_uri(&uri, buf, sizeof(buf));
235 	load_url_in_tab(tab, buf, NULL, LU_MODE_NOCACHE);
236 }
237 
238 void
239 ir_select_gopher(void)
240 {
241 	exit_minibuffer();
242 	minibuffer_hist_save_entry();
243 
244 	gopher_send_search_req(current_tab, ministate.buf);
245 }
246 
247 void
248 lu_select(void)
249 {
250 	char url[GEMINI_URL_LEN+1];
251 
252 	exit_minibuffer();
253 	minibuffer_hist_save_entry();
254 
255 	humanify_url(ministate.buf, url, sizeof(url));
256 	load_url_in_tab(current_tab, url, NULL, LU_MODE_NOCACHE);
257 }
258 
259 void
260 bp_select(void)
261 {
262 	exit_minibuffer();
263 	if (*ministate.buf != '\0')
264 		add_to_bookmarks(ministate.buf);
265 	else
266 		message("Abort.");
267 }
268 
269 void
270 ts_select(void)
271 {
272 	struct tab	*tab;
273 
274 	if ((tab = minibuffer_metadata()) == NULL) {
275 		message("No tab selected");
276 		return;
277 	}
278 
279 	exit_minibuffer();
280 	switch_to_tab(tab);
281 }
282 
283 void
284 ls_select(void)
285 {
286 	struct line	*l;
287 
288 	if ((l = minibuffer_metadata()) == NULL) {
289 		message("No link selected");
290 		return;
291 	}
292 
293 	exit_minibuffer();
294 	load_url_in_tab(current_tab, l->alt, NULL, LU_MODE_NOCACHE);
295 }
296 
297 static inline void
298 jump_to_line(struct line *l)
299 {
300 	struct vline	*vl;
301 	struct buffer	*buffer;
302 
303 	buffer = current_buffer();
304 
305 	TAILQ_FOREACH(vl, &buffer->head, vlines) {
306 		if (vl->parent == l)
307 			break;
308 	}
309 
310 	if (vl == NULL)
311 		message("Ops, %s error!  Please report to %s",
312 		    __func__, PACKAGE_BUGREPORT);
313 	else {
314 		buffer->top_line = vl;
315 		buffer->current_line = vl;
316 	}
317 }
318 
319 void
320 swiper_select(void)
321 {
322 	struct line	*l;
323 
324 	if ((l = minibuffer_metadata()) == NULL) {
325 		message("No line selected");
326 		return;
327 	}
328 
329 	exit_minibuffer();
330 	jump_to_line(l);
331 }
332 
333 void
334 toc_select(void)
335 {
336 	struct line	*l;
337 
338 	if ((l = minibuffer_metadata()) == NULL) {
339 		message("No line selected");
340 		return;
341 	}
342 
343 	exit_minibuffer();
344 	jump_to_line(l);
345 }
346 
347 static void
348 yornp_self_insert(void)
349 {
350 	if (thiskey.key != 'y' && thiskey.key != 'n') {
351 		message("Please answer y or n");
352 		return;
353 	}
354 
355 	exit_minibuffer();
356 	yornp_cb(thiskey.key == 'y', yornp_data);
357 }
358 
359 static void
360 yornp_abort(void)
361 {
362 	exit_minibuffer();
363 	yornp_cb(0, yornp_data);
364 }
365 
366 static void
367 read_self_insert(void)
368 {
369 	if (thiskey.meta || !unicode_isgraph(thiskey.cp)) {
370 		global_key_unbound();
371 		return;
372 	}
373 
374 	minibuffer_self_insert();
375 }
376 
377 static void
378 read_abort(void)
379 {
380 	exit_minibuffer();
381 	read_cb(NULL, read_data);
382 }
383 
384 static void
385 read_select(void)
386 {
387 	exit_minibuffer();
388 	minibuffer_hist_save_entry();
389 	read_cb(ministate.buf, read_data);
390 }
391 
392 /*
393  * TODO: we should collect this asynchronously...
394  */
395 static inline void
396 populate_compl_buffer(complfn *fn, void *data)
397 {
398 	const char	*s, *descr;
399 	struct line	*l;
400 	struct buffer	*b;
401 	struct parser	*p;
402 	void		*linedata;
403 
404 	b = &ministate.compl.buffer;
405 	p = &b->page;
406 
407 	linedata = NULL;
408 	descr = NULL;
409 	while ((s = fn(&data, &linedata, &descr)) != NULL) {
410 		if ((l = calloc(1, sizeof(*l))) == NULL)
411 			abort();
412 
413 		l->type = LINE_COMPL;
414 		l->data = linedata;
415 		l->alt = (char*)descr;
416 		if ((l->line = strdup(s)) == NULL)
417 			abort();
418 
419 		TAILQ_INSERT_TAIL(&p->head, l, lines);
420 
421 		linedata = NULL;
422 		descr = NULL;
423 	}
424 
425 	if ((l = TAILQ_FIRST(&p->head)) != NULL)
426 		l->type = LINE_COMPL_CURRENT;
427 }
428 
429 void
430 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
431     void (*abortfn)(void), struct histhead *hist,
432     complfn *complfn, void *compldata)
433 {
434 	in_minibuffer = complfn == NULL ? MB_READ : MB_COMPREAD;
435 	if (in_minibuffer == MB_COMPREAD) {
436 		ui_schedule_redraw();
437 
438 		ministate.compl.fn = complfn;
439 		ministate.compl.data = compldata;
440 		populate_compl_buffer(complfn, compldata);
441 	}
442 
443 	base_map = &minibuffer_map;
444 	current_map = &minibuffer_map;
445 
446 	base_map->unhandled_input = self_insert_fn;
447 
448 	ministate.donefn = donefn;
449 	ministate.abortfn = abortfn;
450 	memset(ministate.buf, 0, sizeof(ministate.buf));
451 	ministate.buffer.current_line = &ministate.vline;
452 	ministate.buffer.current_line->line = ministate.buf;
453 	ministate.buffer.cpoff = 0;
454 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
455 
456 	ministate.history = hist;
457 	ministate.hist_cur = NULL;
458 	ministate.hist_off = 0;
459 }
460 
461 void
462 exit_minibuffer(void)
463 {
464 	if (in_minibuffer == MB_COMPREAD) {
465 		erase_buffer(&ministate.compl.buffer);
466 		ui_schedule_redraw();
467 	}
468 
469 	in_minibuffer = 0;
470 	base_map = &global_map;
471 	current_map = &global_map;
472 }
473 
474 void
475 yornp(const char *prompt, void (*fn)(int, struct tab*),
476     struct tab *data)
477 {
478 	size_t len;
479 
480 	if (in_minibuffer) {
481 		fn(0, data);
482 		return;
483 	}
484 
485 	yornp_cb = fn;
486 	yornp_data = data;
487 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
488 	    yornp_abort, NULL, NULL, NULL);
489 
490 	len = sizeof(ministate.prompt);
491 	strlcpy(ministate.prompt, prompt, len);
492 	strlcat(ministate.prompt, " (y or n) ", len);
493 }
494 
495 void
496 minibuffer_read(const char *prompt, void (*fn)(const char *, struct tab *),
497     struct tab *data)
498 {
499 	size_t len;
500 
501 	if (in_minibuffer)
502 		return;
503 
504 	read_cb = fn;
505 	read_data = data;
506 	enter_minibuffer(read_self_insert, read_select, read_abort,
507 	    &read_history, NULL, NULL);
508 
509 	len = sizeof(ministate.prompt);
510 	strlcpy(ministate.prompt, prompt, len);
511 	strlcat(ministate.prompt, ": ", len);
512 }
513 
514 static void
515 handle_clear_echoarea(int fd, short ev, void *d)
516 {
517 	free(ministate.curmesg);
518 	ministate.curmesg = NULL;
519 
520 	ui_after_message_hook();
521 }
522 
523 void
524 vmessage(const char *fmt, va_list ap)
525 {
526 	if (evtimer_pending(&clechoev, NULL))
527 		evtimer_del(&clechoev);
528 
529 	free(ministate.curmesg);
530 	ministate.curmesg = NULL;
531 
532 	if (fmt != NULL) {
533 		evtimer_set(&clechoev, handle_clear_echoarea, NULL);
534 		evtimer_add(&clechoev, &clechoev_timer);
535 
536 		/* TODO: what to do if the allocation fails here? */
537 		if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
538 			ministate.curmesg = NULL;
539 	}
540 
541 	ui_after_message_hook();
542 }
543 
544 void
545 message(const char *fmt, ...)
546 {
547 	va_list ap;
548 
549 	va_start(ap, fmt);
550 	vmessage(fmt, ap);
551 	va_end(ap);
552 }
553 
554 void
555 minibuffer_init(void)
556 {
557 	TAILQ_INIT(&eecmd_history.head);
558 	TAILQ_INIT(&ir_history.head);
559 	TAILQ_INIT(&lu_history.head);
560 	TAILQ_INIT(&read_history.head);
561 
562 	TAILQ_INIT(&ministate.compl.buffer.head);
563 	TAILQ_INIT(&ministate.compl.buffer.page.head);
564 
565 	ministate.line.type = LINE_TEXT;
566 	ministate.vline.parent = &ministate.line;
567 	ministate.buffer.page.name = "*minibuffer*";
568 	ministate.buffer.current_line = &ministate.vline;
569 
570 	evtimer_set(&clechoev, handle_clear_echoarea, NULL);
571 }