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 
28 static void		*minibuffer_metadata(void);
29 static void		 minibuffer_hist_save_entry(void);
30 static void		 yornp_self_insert(void);
31 static void		 yornp_abort(void);
32 static void		 read_self_insert(void);
33 static void		 read_abort(void);
34 static void		 read_select(void);
35 static void		 handle_clear_echoarea(int, short, void *);
36 
37 static struct event	clechoev;
38 static struct timeval	clechoev_timer = { 5, 0 };
39 
40 static void (*yornp_cb)(int, struct tab *);
41 static struct tab *yornp_data;
42 
43 static void (*read_cb)(const char*, struct tab *);
44 static struct tab *read_data;
45 
46 /* XXX: don't forget to init these in minibuffer_init */
47 struct histhead eecmd_history,
48 	ir_history,
49 	lu_history,
50 	read_history;
51 
52 struct ministate ministate;
53 
54 struct buffer minibufferwin;
55 
56 int in_minibuffer;
57 
58 /*
59  * Recompute the visible completions.  If add is 1, don't consider the
60  * ones already hidden.
61  */
62 void
63 recompute_completions(int add)
64 {
65 	struct line	*l;
66 	struct vline	*vl;
67 	struct buffer	*b;
68 
69 	if (in_minibuffer != MB_COMPREAD)
70 		return;
71 
72 	b = &ministate.compl.buffer;
73 	TAILQ_FOREACH(l, &b->page.head, lines) {
74 		l->type = LINE_COMPL;
75 		if (add && l->flags & L_HIDDEN)
76 			continue;
77 		if (strcasestr(l->line, ministate.buf) != NULL ||
78 		    (l->alt != NULL && strcasestr(l->alt, ministate.buf) != NULL)) {
79 			if (l->flags & L_HIDDEN)
80 				b->line_max++;
81 			l->flags &= ~L_HIDDEN;
82 		} else {
83 			if (!(l->flags & L_HIDDEN))
84 				b->line_max--;
85 			l->flags |= L_HIDDEN;
86 		}
87 	}
88 
89 	if (b->current_line == NULL)
90 		b->current_line = TAILQ_FIRST(&b->head);
91 	b->current_line = adjust_line(b->current_line, b);
92 	vl = b->current_line;
93 	if (vl != NULL)
94 		vl->parent->type = LINE_COMPL_CURRENT;
95 }
96 
97 static void *
98 minibuffer_metadata(void)
99 {
100 	struct vline	*vl;
101 
102 	vl = ministate.compl.buffer.current_line;
103 
104 	if (vl == NULL || vl->parent->flags & L_HIDDEN)
105 		return NULL;
106 
107 	return vl->parent->data;
108 }
109 
110 static void
111 minibuffer_hist_save_entry(void)
112 {
113 	struct hist	*hist;
114 
115 	if (ministate.history == NULL)
116 		return;
117 
118 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
119 		abort();
120 
121 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
122 
123 	TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
124 	ministate.history->len++;
125 }
126 
127 /*
128  * taint the minibuffer cache: if we're currently showing a history
129  * element, copy that to the current buf and reset the "history
130  * navigation" thing.
131  */
132 void
133 minibuffer_taint_hist(void)
134 {
135 	if (ministate.hist_cur == NULL)
136 		return;
137 
138 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
139 	ministate.hist_cur = NULL;
140 	ministate.buffer.current_line->line = ministate.buf;
141 }
142 
143 void
144 minibuffer_self_insert(void)
145 {
146 	char	*c, tmp[5] = {0};
147 	size_t	len;
148 
149 	minibuffer_taint_hist();
150 
151 	if (thiskey.cp == 0)
152 		return;
153 
154 	len = utf8_encode(thiskey.cp, tmp);
155 	c = utf8_nth(ministate.buffer.current_line->line, ministate.buffer.cpoff);
156 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
157 		return;
158 
159 	memmove(c + len, c, strlen(c)+1);
160 	memcpy(c, tmp, len);
161 	ministate.buffer.cpoff++;
162 
163 	recompute_completions(1);
164 }
165 
166 void
167 sensible_self_insert(void)
168 {
169 	if (thiskey.meta ||
170 	    (!unicode_isgraph(thiskey.key) && thiskey.key != ' ')) {
171 		global_key_unbound();
172 		return;
173 	}
174 
175 	minibuffer_self_insert();
176 }
177 
178 void
179 eecmd_select(void)
180 {
181 	struct cmd *cmd;
182 
183 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
184 		if (!strcmp(cmd->cmd, ministate.buf)) {
185 			exit_minibuffer();
186 			minibuffer_hist_save_entry();
187 			cmd->fn(current_buffer());
188 			return;
189 		}
190 	}
191 
192 	message("No match");
193 }
194 
195 void
196 ir_select_gemini(void)
197 {
198 	char		 buf[1025] = {0};
199 	struct phos_uri	 uri;
200 	struct tab	*tab = current_tab;
201 
202 	exit_minibuffer();
203 	minibuffer_hist_save_entry();
204 
205 	/* a bit ugly but... */
206 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
207 	phos_uri_set_query(&uri, ministate.buf);
208 	phos_serialize_uri(&uri, buf, sizeof(buf));
209 	load_url_in_tab(tab, buf, NULL, 0);
210 }
211 
212 void
213 ir_select_gopher(void)
214 {
215 	exit_minibuffer();
216 	minibuffer_hist_save_entry();
217 
218 	gopher_send_search_req(current_tab, ministate.buf);
219 }
220 
221 void
222 lu_select(void)
223 {
224 	char url[GEMINI_URL_LEN+1];
225 
226 	exit_minibuffer();
227 	minibuffer_hist_save_entry();
228 
229 	humanify_url(ministate.buf, url, sizeof(url));
230 	load_url_in_tab(current_tab, url, NULL, 0);
231 }
232 
233 void
234 bp_select(void)
235 {
236 	exit_minibuffer();
237 	if (*ministate.buf != '\0')
238 		add_to_bookmarks(ministate.buf);
239 	else
240 		message("Abort.");
241 }
242 
243 void
244 ts_select(void)
245 {
246 	struct tab	*tab;
247 
248 	if ((tab = minibuffer_metadata()) == NULL) {
249 		message("No tab selected");
250 		return;
251 	}
252 
253 	exit_minibuffer();
254 	switch_to_tab(tab);
255 }
256 
257 void
258 ls_select(void)
259 {
260 	struct line	*l;
261 
262 	if ((l = minibuffer_metadata()) == NULL) {
263 		message("No link selected");
264 		return;
265 	}
266 
267 	exit_minibuffer();
268 	load_url_in_tab(current_tab, l->alt, NULL, 0);
269 }
270 
271 static inline void
272 jump_to_line(struct line *l)
273 {
274 	struct vline	*vl;
275 	struct buffer	*buffer;
276 
277 	buffer = current_buffer();
278 
279 	TAILQ_FOREACH(vl, &buffer->head, vlines) {
280 		if (vl->parent == l)
281 			break;
282 	}
283 
284 	if (vl == NULL)
285 		message("Ops, %s error!  Please report to %s",
286 		    __func__, PACKAGE_BUGREPORT);
287 	else {
288 		buffer->top_line = vl;
289 		buffer->current_line = vl;
290 	}
291 }
292 
293 void
294 swiper_select(void)
295 {
296 	struct line	*l;
297 
298 	if ((l = minibuffer_metadata()) == NULL) {
299 		message("No line selected");
300 		return;
301 	}
302 
303 	exit_minibuffer();
304 	jump_to_line(l);
305 }
306 
307 void
308 toc_select(void)
309 {
310 	struct line	*l;
311 
312 	if ((l = minibuffer_metadata()) == NULL) {
313 		message("No line selected");
314 		return;
315 	}
316 
317 	exit_minibuffer();
318 	jump_to_line(l);
319 }
320 
321 static void
322 yornp_self_insert(void)
323 {
324 	if (thiskey.key != 'y' && thiskey.key != 'n') {
325 		message("Please answer y or n");
326 		return;
327 	}
328 
329 	exit_minibuffer();
330 	yornp_cb(thiskey.key == 'y', yornp_data);
331 }
332 
333 static void
334 yornp_abort(void)
335 {
336 	exit_minibuffer();
337 	yornp_cb(0, yornp_data);
338 }
339 
340 static void
341 read_self_insert(void)
342 {
343 	if (thiskey.meta || !unicode_isgraph(thiskey.cp)) {
344 		global_key_unbound();
345 		return;
346 	}
347 
348 	minibuffer_self_insert();
349 }
350 
351 static void
352 read_abort(void)
353 {
354 	exit_minibuffer();
355 	read_cb(NULL, read_data);
356 }
357 
358 static void
359 read_select(void)
360 {
361         exit_minibuffer();
362 	minibuffer_hist_save_entry();
363 	read_cb(ministate.buf, read_data);
364 }
365 
366 /*
367  * TODO: we should collect this asynchronously...
368  */
369 static inline void
370 populate_compl_buffer(complfn *fn, void *data)
371 {
372 	const char	*s, *descr;
373 	struct line	*l;
374 	struct buffer	*b;
375 	struct parser	*p;
376 	void		*linedata;
377 
378 	b = &ministate.compl.buffer;
379 	p = &b->page;
380 
381 	linedata = NULL;
382 	descr = NULL;
383 	while ((s = fn(&data, &linedata, &descr)) != NULL) {
384 		if ((l = calloc(1, sizeof(*l))) == NULL)
385 			abort();
386 
387 		l->type = LINE_COMPL;
388 		l->data = linedata;
389 		l->alt = (char*)descr;
390 		if ((l->line = strdup(s)) == NULL)
391 			abort();
392 
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 	TAILQ_INIT(&read_history.head);
535 
536 	TAILQ_INIT(&ministate.compl.buffer.head);
537 	TAILQ_INIT(&ministate.compl.buffer.page.head);
538 
539 	ministate.line.type = LINE_TEXT;
540 	ministate.vline.parent = &ministate.line;
541 	ministate.buffer.page.name = "*minibuffer*";
542 	ministate.buffer.current_line = &ministate.vline;
543 
544 	evtimer_set(&clechoev, handle_clear_echoarea, NULL);
545 }