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_gemini(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 ir_select_gopher(void)
215 {
216 	exit_minibuffer();
217 	minibuffer_hist_save_entry();
218 
219 	gopher_send_search_req(current_tab, ministate.buf);
220 }
221 
222 void
223 lu_select(void)
224 {
225 	exit_minibuffer();
226 	minibuffer_hist_save_entry();
227 	load_url_in_tab(current_tab, ministate.buf, NULL);
228 }
229 
230 void
231 bp_select(void)
232 {
233 	exit_minibuffer();
234 	if (*ministate.buf != '\0')
235 		add_to_bookmarks(ministate.buf);
236 	else
237 		message("Abort.");
238 }
239 
240 void
241 ts_select(void)
242 {
243 	struct tab	*tab;
244 
245 	if ((tab = minibuffer_metadata()) == NULL) {
246 		message("No tab selected");
247 		return;
248 	}
249 
250 	exit_minibuffer();
251 	switch_to_tab(tab);
252 }
253 
254 void
255 ls_select(void)
256 {
257 	struct line	*l;
258 
259 	if ((l = minibuffer_metadata()) == NULL) {
260 		message("No link selected");
261 		return;
262 	}
263 
264 	exit_minibuffer();
265 	load_url_in_tab(current_tab, l->alt, NULL);
266 }
267 
268 static inline void
269 jump_to_line(struct line *l)
270 {
271 	struct vline	*vl;
272 	struct buffer	*buffer;
273 
274 	buffer = current_buffer();
275 
276 	TAILQ_FOREACH(vl, &buffer->head, vlines) {
277 		if (vl->parent == l)
278 			break;
279 	}
280 
281 	if (vl == NULL)
282 		message("Ops, %s error!  Please report to %s",
283 		    __func__, PACKAGE_BUGREPORT);
284 	else {
285 		buffer->top_line = vl;
286 		buffer->current_line = vl;
287 	}
288 }
289 
290 void
291 swiper_select(void)
292 {
293 	struct line	*l;
294 
295 	if ((l = minibuffer_metadata()) == NULL) {
296 		message("No line selected");
297 		return;
298 	}
299 
300 	exit_minibuffer();
301 	jump_to_line(l);
302 }
303 
304 void
305 toc_select(void)
306 {
307 	struct line	*l;
308 
309 	if ((l = minibuffer_metadata()) == NULL) {
310 		message("No line selected");
311 		return;
312 	}
313 
314 	exit_minibuffer();
315 	jump_to_line(l);
316 }
317 
318 static void
319 yornp_self_insert(void)
320 {
321 	if (thiskey.key != 'y' && thiskey.key != 'n') {
322 		message("Please answer y or n");
323 		return;
324 	}
325 
326 	exit_minibuffer();
327 	yornp_cb(thiskey.key == 'y', yornp_data);
328 }
329 
330 static void
331 yornp_abort(void)
332 {
333 	exit_minibuffer();
334 	yornp_cb(0, yornp_data);
335 }
336 
337 static void
338 read_self_insert(void)
339 {
340 	if (thiskey.meta || !unicode_isgraph(thiskey.cp)) {
341 		global_key_unbound();
342 		return;
343 	}
344 
345 	minibuffer_self_insert();
346 }
347 
348 static void
349 read_abort(void)
350 {
351 	exit_minibuffer();
352 	read_cb(NULL, read_data);
353 }
354 
355 static void
356 read_select(void)
357 {
358         exit_minibuffer();
359 	minibuffer_hist_save_entry();
360 	read_cb(ministate.buf, read_data);
361 }
362 
363 /*
364  * TODO: we should collect this asynchronously...
365  */
366 static inline void
367 populate_compl_buffer(complfn *fn, void *data)
368 {
369 	const char	*s, *descr;
370 	struct line	*l;
371 	struct buffer	*b;
372 	struct parser	*p;
373 	void		*linedata;
374 
375 	b = &ministate.compl.buffer;
376 	p = &b->page;
377 
378 	linedata = NULL;
379 	descr = NULL;
380 	while ((s = fn(&data, &linedata, &descr)) != NULL) {
381 		if ((l = calloc(1, sizeof(*l))) == NULL)
382 			abort();
383 
384 		l->type = LINE_COMPL;
385 		l->data = linedata;
386 		l->alt = (char*)descr;
387 		if ((l->line = strdup(s)) == NULL)
388 			abort();
389 
390 		if (TAILQ_EMPTY(&p->head))
391 			TAILQ_INSERT_HEAD(&p->head, l, lines);
392 		else
393 			TAILQ_INSERT_TAIL(&p->head, l, lines);
394 
395 		linedata = NULL;
396 		descr = NULL;
397 	}
398 
399 	if ((l = TAILQ_FIRST(&p->head)) != NULL)
400 		l->type = LINE_COMPL_CURRENT;
401 }
402 
403 void
404 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
405     void (*abortfn)(void), struct histhead *hist,
406     complfn *complfn, void *compldata)
407 {
408 	in_minibuffer = complfn == NULL ? MB_READ : MB_COMPREAD;
409 	if (in_minibuffer == MB_COMPREAD) {
410 		ui_schedule_redraw();
411 
412 		ministate.compl.fn = complfn;
413 		ministate.compl.data = compldata;
414 		populate_compl_buffer(complfn, compldata);
415 	}
416 
417 	base_map = &minibuffer_map;
418 	current_map = &minibuffer_map;
419 
420 	base_map->unhandled_input = self_insert_fn;
421 
422 	ministate.donefn = donefn;
423 	ministate.abortfn = abortfn;
424 	memset(ministate.buf, 0, sizeof(ministate.buf));
425 	ministate.buffer.current_line = &ministate.vline;
426 	ministate.buffer.current_line->line = ministate.buf;
427 	ministate.buffer.cpoff = 0;
428 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
429 
430 	ministate.history = hist;
431 	ministate.hist_cur = NULL;
432 	ministate.hist_off = 0;
433 }
434 
435 void
436 exit_minibuffer(void)
437 {
438 	if (in_minibuffer == MB_COMPREAD) {
439 		erase_buffer(&ministate.compl.buffer);
440 		ui_schedule_redraw();
441 	}
442 
443 	in_minibuffer = 0;
444 	base_map = &global_map;
445 	current_map = &global_map;
446 }
447 
448 void
449 yornp(const char *prompt, void (*fn)(int, struct tab*),
450     struct tab *data)
451 {
452 	size_t len;
453 
454 	if (in_minibuffer) {
455 		fn(0, data);
456 		return;
457 	}
458 
459 	yornp_cb = fn;
460 	yornp_data = data;
461 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
462 	    yornp_abort, NULL, NULL, NULL);
463 
464 	len = sizeof(ministate.prompt);
465 	strlcpy(ministate.prompt, prompt, len);
466 	strlcat(ministate.prompt, " (y or n) ", len);
467 }
468 
469 void
470 minibuffer_read(const char *prompt, void (*fn)(const char *, struct tab *),
471     struct tab *data)
472 {
473 	size_t len;
474 
475 	if (in_minibuffer)
476 		return;
477 
478 	read_cb = fn;
479 	read_data = data;
480 	enter_minibuffer(read_self_insert, read_select, read_abort,
481 	    &read_history, NULL, NULL);
482 
483 	len = sizeof(ministate.prompt);
484 	strlcpy(ministate.prompt, prompt, len);
485 	strlcat(ministate.prompt, ": ", len);
486 }
487 
488 static void
489 handle_clear_echoarea(int fd, short ev, void *d)
490 {
491 	free(ministate.curmesg);
492 	ministate.curmesg = NULL;
493 
494 	ui_after_message_hook();
495 }
496 
497 void
498 vmessage(const char *fmt, va_list ap)
499 {
500 	if (evtimer_pending(&clechoev, NULL))
501 		evtimer_del(&clechoev);
502 
503 	free(ministate.curmesg);
504 	ministate.curmesg = NULL;
505 
506 	if (fmt != NULL) {
507 		evtimer_set(&clechoev, handle_clear_echoarea, NULL);
508 		evtimer_add(&clechoev, &clechoev_timer);
509 
510 		/* TODO: what to do if the allocation fails here? */
511 		if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
512 			ministate.curmesg = NULL;
513 	}
514 
515 	ui_after_message_hook();
516 }
517 
518 void
519 message(const char *fmt, ...)
520 {
521 	va_list ap;
522 
523 	va_start(ap, fmt);
524 	vmessage(fmt, ap);
525 	va_end(ap);
526 }
527 
528 void
529 minibuffer_init(void)
530 {
531 	TAILQ_INIT(&eecmd_history.head);
532 	TAILQ_INIT(&ir_history.head);
533 	TAILQ_INIT(&lu_history.head);
534 
535 	ministate.line.type = LINE_TEXT;
536 	ministate.vline.parent = &ministate.line;
537 	ministate.buffer.page.name = "*minibuffer*";
538 	ministate.buffer.current_line = &ministate.vline;
539 
540 	evtimer_set(&clechoev, handle_clear_echoarea, NULL);
541 }