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_isgraph(thiskey.key) && thiskey.key != ' ')) {
172 		global_key_unbound();
173 		return;
174 	}
175 
176 	minibuffer_self_insert();
177 }
178 
179 void
180 eecmd_select(void)
181 {
182 	struct cmd *cmd;
183 
184 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
185 		if (!strcmp(cmd->cmd, ministate.buf)) {
186 			exit_minibuffer();
187 			minibuffer_hist_save_entry();
188 			cmd->fn(current_buffer());
189 			return;
190 		}
191 	}
192 
193 	message("No match");
194 }
195 
196 void
197 ir_select(void)
198 {
199 	char		 buf[1025] = {0};
200 	struct phos_uri	 uri;
201 	struct tab	*tab = current_tab;
202 
203 	exit_minibuffer();
204 	minibuffer_hist_save_entry();
205 
206 	/* a bit ugly but... */
207 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
208 	phos_uri_set_query(&uri, ministate.buf);
209 	phos_serialize_uri(&uri, buf, sizeof(buf));
210 	load_url_in_tab(tab, buf, NULL);
211 }
212 
213 void
214 lu_select(void)
215 {
216 	exit_minibuffer();
217 	minibuffer_hist_save_entry();
218 	load_url_in_tab(current_tab, ministate.buf, NULL);
219 }
220 
221 void
222 bp_select(void)
223 {
224 	exit_minibuffer();
225 	if (*ministate.buf != '\0')
226 		add_to_bookmarks(ministate.buf);
227 	else
228 		message("Abort.");
229 }
230 
231 void
232 ts_select(void)
233 {
234 	struct tab	*tab;
235 
236 	if ((tab = minibuffer_metadata()) == NULL) {
237 		message("No tab selected");
238 		return;
239 	}
240 
241 	exit_minibuffer();
242 	switch_to_tab(tab);
243 }
244 
245 void
246 ls_select(void)
247 {
248 	struct line	*l;
249 
250 	if ((l = minibuffer_metadata()) == NULL) {
251 		message("No link selected");
252 		return;
253 	}
254 
255 	exit_minibuffer();
256 	load_url_in_tab(current_tab, l->alt, NULL);
257 }
258 
259 static inline void
260 jump_to_line(struct line *l)
261 {
262 	struct vline	*vl;
263 	struct buffer	*buffer;
264 
265 	buffer = current_buffer();
266 
267 	TAILQ_FOREACH(vl, &buffer->head, vlines) {
268 		if (vl->parent == l)
269 			break;
270 	}
271 
272 	if (vl == NULL)
273 		message("Ops, %s error!  Please report to %s",
274 		    __func__, PACKAGE_BUGREPORT);
275 	else {
276 		buffer->top_line = vl;
277 		buffer->current_line = vl;
278 	}
279 }
280 
281 void
282 swiper_select(void)
283 {
284 	struct line	*l;
285 
286 	if ((l = minibuffer_metadata()) == NULL) {
287 		message("No line selected");
288 		return;
289 	}
290 
291 	exit_minibuffer();
292 	jump_to_line(l);
293 }
294 
295 void
296 toc_select(void)
297 {
298 	struct line	*l;
299 
300 	if ((l = minibuffer_metadata()) == NULL) {
301 		message("No line selected");
302 		return;
303 	}
304 
305 	exit_minibuffer();
306 	jump_to_line(l);
307 }
308 
309 static void
310 yornp_self_insert(void)
311 {
312 	if (thiskey.key != 'y' && thiskey.key != 'n') {
313 		message("Please answer y or n");
314 		return;
315 	}
316 
317 	exit_minibuffer();
318 	yornp_cb(thiskey.key == 'y', yornp_data);
319 }
320 
321 static void
322 yornp_abort(void)
323 {
324 	exit_minibuffer();
325 	yornp_cb(0, yornp_data);
326 }
327 
328 static void
329 read_self_insert(void)
330 {
331 	if (thiskey.meta || !unicode_isgraph(thiskey.cp)) {
332 		global_key_unbound();
333 		return;
334 	}
335 
336 	minibuffer_self_insert();
337 }
338 
339 static void
340 read_abort(void)
341 {
342 	exit_minibuffer();
343 	read_cb(NULL, read_data);
344 }
345 
346 static void
347 read_select(void)
348 {
349         exit_minibuffer();
350 	minibuffer_hist_save_entry();
351 	read_cb(ministate.buf, read_data);
352 }
353 
354 /*
355  * TODO: we should collect this asynchronously...
356  */
357 static inline void
358 populate_compl_buffer(complfn *fn, void *data)
359 {
360 	const char	*s, *descr;
361 	struct line	*l;
362 	struct buffer	*b;
363 	struct parser	*p;
364 	void		*linedata;
365 
366 	b = &ministate.compl.buffer;
367 	p = &b->page;
368 
369 	linedata = NULL;
370 	descr = NULL;
371 	while ((s = fn(&data, &linedata, &descr)) != NULL) {
372 		if ((l = calloc(1, sizeof(*l))) == NULL)
373 			abort();
374 
375 		l->type = LINE_COMPL;
376 		l->data = linedata;
377 		l->alt = (char*)descr;
378 		if ((l->line = strdup(s)) == NULL)
379 			abort();
380 
381 		if (TAILQ_EMPTY(&p->head))
382 			TAILQ_INSERT_HEAD(&p->head, l, lines);
383 		else
384 			TAILQ_INSERT_TAIL(&p->head, l, lines);
385 
386 		linedata = NULL;
387 		descr = NULL;
388 	}
389 
390 	if ((l = TAILQ_FIRST(&p->head)) != NULL)
391 		l->type = LINE_COMPL_CURRENT;
392 }
393 
394 void
395 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
396     void (*abortfn)(void), struct histhead *hist,
397     complfn *complfn, void *compldata)
398 {
399 	in_minibuffer = complfn == NULL ? MB_READ : MB_COMPREAD;
400 	if (in_minibuffer == MB_COMPREAD) {
401 		ui_schedule_redraw();
402 
403 		ministate.compl.fn = complfn;
404 		ministate.compl.data = compldata;
405 		populate_compl_buffer(complfn, compldata);
406 	}
407 
408 	base_map = &minibuffer_map;
409 	current_map = &minibuffer_map;
410 
411 	base_map->unhandled_input = self_insert_fn;
412 
413 	ministate.donefn = donefn;
414 	ministate.abortfn = abortfn;
415 	memset(ministate.buf, 0, sizeof(ministate.buf));
416 	ministate.buffer.current_line = &ministate.vline;
417 	ministate.buffer.current_line->line = ministate.buf;
418 	ministate.buffer.cpoff = 0;
419 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
420 
421 	ministate.history = hist;
422 	ministate.hist_cur = NULL;
423 	ministate.hist_off = 0;
424 }
425 
426 void
427 exit_minibuffer(void)
428 {
429 	if (in_minibuffer == MB_COMPREAD) {
430 		erase_buffer(&ministate.compl.buffer);
431 		ui_schedule_redraw();
432 	}
433 
434 	in_minibuffer = 0;
435 	base_map = &global_map;
436 	current_map = &global_map;
437 }
438 
439 void
440 yornp(const char *prompt, void (*fn)(int, struct tab*),
441     struct tab *data)
442 {
443 	size_t len;
444 
445 	if (in_minibuffer) {
446 		fn(0, data);
447 		return;
448 	}
449 
450 	yornp_cb = fn;
451 	yornp_data = data;
452 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
453 	    yornp_abort, NULL, NULL, NULL);
454 
455 	len = sizeof(ministate.prompt);
456 	strlcpy(ministate.prompt, prompt, len);
457 	strlcat(ministate.prompt, " (y or n) ", len);
458 }
459 
460 void
461 minibuffer_read(const char *prompt, void (*fn)(const char *, struct tab *),
462     struct tab *data)
463 {
464 	size_t len;
465 
466 	if (in_minibuffer)
467 		return;
468 
469 	read_cb = fn;
470 	read_data = data;
471 	enter_minibuffer(read_self_insert, read_select, read_abort,
472 	    &read_history, NULL, NULL);
473 
474 	len = sizeof(ministate.prompt);
475 	strlcpy(ministate.prompt, prompt, len);
476 	strlcat(ministate.prompt, ": ", len);
477 }
478 
479 static void
480 handle_clear_echoarea(int fd, short ev, void *d)
481 {
482 	free(ministate.curmesg);
483 	ministate.curmesg = NULL;
484 
485 	ui_after_message_hook();
486 }
487 
488 void
489 vmessage(const char *fmt, va_list ap)
490 {
491 	if (evtimer_pending(&clechoev, NULL))
492 		evtimer_del(&clechoev);
493 
494 	free(ministate.curmesg);
495 	ministate.curmesg = NULL;
496 
497 	if (fmt != NULL) {
498 		evtimer_set(&clechoev, handle_clear_echoarea, NULL);
499 		evtimer_add(&clechoev, &clechoev_timer);
500 
501 		/* TODO: what to do if the allocation fails here? */
502 		if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
503 			ministate.curmesg = NULL;
504 	}
505 
506 	ui_after_message_hook();
507 }
508 
509 void
510 message(const char *fmt, ...)
511 {
512 	va_list ap;
513 
514 	va_start(ap, fmt);
515 	vmessage(fmt, ap);
516 	va_end(ap);
517 }
518 
519 void
520 minibuffer_init(void)
521 {
522 	TAILQ_INIT(&eecmd_history.head);
523 	TAILQ_INIT(&ir_history.head);
524 	TAILQ_INIT(&lu_history.head);
525 
526 	ministate.line.type = LINE_TEXT;
527 	ministate.vline.parent = &ministate.line;
528 	ministate.buffer.current_line = &ministate.vline;
529 
530 	evtimer_set(&clechoev, handle_clear_echoarea, NULL);
531 }