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