status.c revision 1.121 
1/* $OpenBSD: status.c,v 1.121 2015/02/05 10:29:43 nicm Exp $ */
2
3/*
4 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20#include <sys/time.h>
21
22#include <errno.h>
23#include <limits.h>
24#include <stdarg.h>
25#include <stdlib.h>
26#include <string.h>
27#include <time.h>
28#include <unistd.h>
29
30#include "tmux.h"
31
32char   *status_redraw_get_left(
33	    struct client *, time_t, int, struct grid_cell *, size_t *);
34char   *status_redraw_get_right(
35	    struct client *, time_t, int, struct grid_cell *, size_t *);
36char   *status_find_job(struct client *, char **);
37void	status_job_free(void *);
38void	status_job_callback(struct job *);
39char   *status_print(
40	    struct client *, struct winlink *, time_t, struct grid_cell *);
41void	status_replace1(struct client *, char **, char **, char *, size_t, int);
42void	status_message_callback(int, short, void *);
43
44const char *status_prompt_up_history(u_int *);
45const char *status_prompt_down_history(u_int *);
46void	status_prompt_add_history(const char *);
47char   *status_prompt_complete(const char *);
48
49/* Status prompt history. */
50ARRAY_DECL(, char *) status_prompt_history = ARRAY_INITIALIZER;
51
52/* Status output tree. */
53RB_GENERATE(status_out_tree, status_out, entry, status_out_cmp);
54
55/* Output tree comparison function. */
56int
57status_out_cmp(struct status_out *so1, struct status_out *so2)
58{
59	return (strcmp(so1->cmd, so2->cmd));
60}
61
62/* Get screen line of status line. -1 means off. */
63int
64status_at_line(struct client *c)
65{
66	struct session	*s = c->session;
67
68	if (!options_get_number(&s->options, "status"))
69		return (-1);
70
71	if (options_get_number(&s->options, "status-position") == 0)
72		return (0);
73	return (c->tty.sy - 1);
74}
75
76/* Retrieve options for left string. */
77char *
78status_redraw_get_left(struct client *c, time_t t, int utf8flag,
79    struct grid_cell *gc, size_t *size)
80{
81	struct session	*s = c->session;
82	const char	*template;
83	char		*left;
84	size_t		 leftlen;
85
86	style_apply_update(gc, &s->options, "status-left-style");
87
88	template = options_get_string(&s->options, "status-left");
89	left = status_replace(c, NULL, template , t, 1);
90
91	*size = options_get_number(&s->options, "status-left-length");
92	leftlen = screen_write_cstrlen(utf8flag, "%s", left);
93	if (leftlen < *size)
94		*size = leftlen;
95	return (left);
96}
97
98/* Retrieve options for right string. */
99char *
100status_redraw_get_right(struct client *c, time_t t, int utf8flag,
101    struct grid_cell *gc, size_t *size)
102{
103	struct session	*s = c->session;
104	const char	*template;
105	char		*right;
106	size_t		 rightlen;
107
108	style_apply_update(gc, &s->options, "status-right-style");
109
110	template = options_get_string(&s->options, "status-right");
111	right = status_replace(c, NULL, template, t, 1);
112
113	*size = options_get_number(&s->options, "status-right-length");
114	rightlen = screen_write_cstrlen(utf8flag, "%s", right);
115	if (rightlen < *size)
116		*size = rightlen;
117	return (right);
118}
119
120/* Set window at window list position. */
121void
122status_set_window_at(struct client *c, u_int x)
123{
124	struct session	*s = c->session;
125	struct winlink	*wl;
126	struct options	*oo;
127	size_t		 len;
128
129	x += c->wlmouse;
130	RB_FOREACH(wl, winlinks, &s->windows) {
131		oo = &wl->window->options;
132
133		len = strlen(options_get_string(oo, "window-status-separator"));
134		if (x < wl->status_width && session_select(s, wl->idx) == 0)
135			server_redraw_session(s);
136		x -= wl->status_width + len;
137	}
138}
139
140/* Draw status for client on the last lines of given context. */
141int
142status_redraw(struct client *c)
143{
144	struct screen_write_ctx	ctx;
145	struct session	       *s = c->session;
146	struct winlink	       *wl;
147	struct screen		old_status, window_list;
148	struct grid_cell	stdgc, lgc, rgc, gc;
149	struct options	       *oo;
150	time_t			t;
151	char		       *left, *right, *sep;
152	u_int			offset, needed;
153	u_int			wlstart, wlwidth, wlavailable, wloffset, wlsize;
154	size_t			llen, rlen, seplen;
155	int			larrow, rarrow, utf8flag;
156
157	/* No status line? */
158	if (c->tty.sy == 0 || !options_get_number(&s->options, "status"))
159		return (1);
160	left = right = NULL;
161	larrow = rarrow = 0;
162
163	/* Update status timer. */
164	if (gettimeofday(&c->status_timer, NULL) != 0)
165		fatal("gettimeofday failed");
166	t = c->status_timer.tv_sec;
167
168	/* Set up default colour. */
169	style_apply(&stdgc, &s->options, "status-style");
170
171	/* Create the target screen. */
172	memcpy(&old_status, &c->status, sizeof old_status);
173	screen_init(&c->status, c->tty.sx, 1, 0);
174	screen_write_start(&ctx, NULL, &c->status);
175	for (offset = 0; offset < c->tty.sx; offset++)
176		screen_write_putc(&ctx, &stdgc, ' ');
177	screen_write_stop(&ctx);
178
179	/* If the height is one line, blank status line. */
180	if (c->tty.sy <= 1)
181		goto out;
182
183	/* Get UTF-8 flag. */
184	utf8flag = options_get_number(&s->options, "status-utf8");
185
186	/* Work out left and right strings. */
187	memcpy(&lgc, &stdgc, sizeof lgc);
188	left = status_redraw_get_left(c, t, utf8flag, &lgc, &llen);
189	memcpy(&rgc, &stdgc, sizeof rgc);
190	right = status_redraw_get_right(c, t, utf8flag, &rgc, &rlen);
191
192	/*
193	 * Figure out how much space we have for the window list. If there
194	 * isn't enough space, just show a blank status line.
195	 */
196	needed = 0;
197	if (llen != 0)
198		needed += llen;
199	if (rlen != 0)
200		needed += rlen;
201	if (c->tty.sx == 0 || c->tty.sx <= needed)
202		goto out;
203	wlavailable = c->tty.sx - needed;
204
205	/* Calculate the total size needed for the window list. */
206	wlstart = wloffset = wlwidth = 0;
207	RB_FOREACH(wl, winlinks, &s->windows) {
208		free(wl->status_text);
209		memcpy(&wl->status_cell, &stdgc, sizeof wl->status_cell);
210		wl->status_text = status_print(c, wl, t, &wl->status_cell);
211		wl->status_width =
212		    screen_write_cstrlen(utf8flag, "%s", wl->status_text);
213
214		if (wl == s->curw)
215			wloffset = wlwidth;
216
217		oo = &wl->window->options;
218		sep = options_get_string(oo, "window-status-separator");
219		seplen = screen_write_strlen(utf8flag, "%s", sep);
220		wlwidth += wl->status_width + seplen;
221	}
222
223	/* Create a new screen for the window list. */
224	screen_init(&window_list, wlwidth, 1, 0);
225
226	/* And draw the window list into it. */
227	screen_write_start(&ctx, NULL, &window_list);
228	RB_FOREACH(wl, winlinks, &s->windows) {
229		screen_write_cnputs(&ctx,
230		    -1, &wl->status_cell, utf8flag, "%s", wl->status_text);
231
232		oo = &wl->window->options;
233		sep = options_get_string(oo, "window-status-separator");
234		screen_write_nputs(&ctx, -1, &stdgc, utf8flag, "%s", sep);
235	}
236	screen_write_stop(&ctx);
237
238	/* If there is enough space for the total width, skip to draw now. */
239	if (wlwidth <= wlavailable)
240		goto draw;
241
242	/* Find size of current window text. */
243	wlsize = s->curw->status_width;
244
245	/*
246	 * If the current window is already on screen, good to draw from the
247	 * start and just leave off the end.
248	 */
249	if (wloffset + wlsize < wlavailable) {
250		if (wlavailable > 0) {
251			rarrow = 1;
252			wlavailable--;
253		}
254		wlwidth = wlavailable;
255	} else {
256		/*
257		 * Work out how many characters we need to omit from the
258		 * start. There are wlavailable characters to fill, and
259		 * wloffset + wlsize must be the last. So, the start character
260		 * is wloffset + wlsize - wlavailable.
261		 */
262		if (wlavailable > 0) {
263			larrow = 1;
264			wlavailable--;
265		}
266
267		wlstart = wloffset + wlsize - wlavailable;
268		if (wlavailable > 0 && wlwidth > wlstart + wlavailable + 1) {
269			rarrow = 1;
270			wlstart++;
271			wlavailable--;
272		}
273		wlwidth = wlavailable;
274	}
275
276	/* Bail if anything is now too small too. */
277	if (wlwidth == 0 || wlavailable == 0) {
278		screen_free(&window_list);
279		goto out;
280	}
281
282	/*
283	 * Now the start position is known, work out the state of the left and
284	 * right arrows.
285	 */
286	offset = 0;
287	RB_FOREACH(wl, winlinks, &s->windows) {
288		if (wl->flags & WINLINK_ALERTFLAGS &&
289		    larrow == 1 && offset < wlstart)
290			larrow = -1;
291
292		offset += wl->status_width;
293
294		if (wl->flags & WINLINK_ALERTFLAGS &&
295		    rarrow == 1 && offset > wlstart + wlwidth)
296			rarrow = -1;
297	}
298
299draw:
300	/* Begin drawing. */
301	screen_write_start(&ctx, NULL, &c->status);
302
303	/* Draw the left string and arrow. */
304	screen_write_cursormove(&ctx, 0, 0);
305	if (llen != 0)
306		screen_write_cnputs(&ctx, llen, &lgc, utf8flag, "%s", left);
307	if (larrow != 0) {
308		memcpy(&gc, &stdgc, sizeof gc);
309		if (larrow == -1)
310			gc.attr ^= GRID_ATTR_REVERSE;
311		screen_write_putc(&ctx, &gc, '<');
312	}
313
314	/* Draw the right string and arrow. */
315	if (rarrow != 0) {
316		screen_write_cursormove(&ctx, c->tty.sx - rlen - 1, 0);
317		memcpy(&gc, &stdgc, sizeof gc);
318		if (rarrow == -1)
319			gc.attr ^= GRID_ATTR_REVERSE;
320		screen_write_putc(&ctx, &gc, '>');
321	} else
322		screen_write_cursormove(&ctx, c->tty.sx - rlen, 0);
323	if (rlen != 0)
324		screen_write_cnputs(&ctx, rlen, &rgc, utf8flag, "%s", right);
325
326	/* Figure out the offset for the window list. */
327	if (llen != 0)
328		wloffset = llen;
329	else
330		wloffset = 0;
331	if (wlwidth < wlavailable) {
332		switch (options_get_number(&s->options, "status-justify")) {
333		case 1:	/* centred */
334			wloffset += (wlavailable - wlwidth) / 2;
335			break;
336		case 2:	/* right */
337			wloffset += (wlavailable - wlwidth);
338			break;
339		}
340	}
341	if (larrow != 0)
342		wloffset++;
343
344	/* Copy the window list. */
345	c->wlmouse = -wloffset + wlstart;
346	screen_write_cursormove(&ctx, wloffset, 0);
347	screen_write_copy(&ctx, &window_list, wlstart, 0, wlwidth, 1);
348	screen_free(&window_list);
349
350	screen_write_stop(&ctx);
351
352out:
353	free(left);
354	free(right);
355
356	if (grid_compare(c->status.grid, old_status.grid) == 0) {
357		screen_free(&old_status);
358		return (0);
359	}
360	screen_free(&old_status);
361	return (1);
362}
363
364/* Replace a single special sequence (prefixed by #). */
365void
366status_replace1(struct client *c, char **iptr, char **optr, char *out,
367    size_t outsize, int jobsflag)
368{
369	char	ch, tmp[256], *ptr, *endptr;
370	size_t	ptrlen;
371	long	limit;
372
373	errno = 0;
374	limit = strtol(*iptr, &endptr, 10);
375	if ((limit == 0 && errno != EINVAL) ||
376	    (limit == LONG_MIN && errno != ERANGE) ||
377	    (limit == LONG_MAX && errno != ERANGE) ||
378	    limit != 0)
379		*iptr = endptr;
380	if (limit <= 0)
381		limit = LONG_MAX;
382
383	switch (*(*iptr)++) {
384	case '(':
385		if (!jobsflag) {
386			ch = ')';
387			goto skip_to;
388		}
389		if ((ptr = status_find_job(c, iptr)) == NULL)
390			return;
391		goto do_replace;
392	case '[':
393		/*
394		 * Embedded style, handled at display time. Leave present and
395		 * skip input until ].
396		 */
397		ch = ']';
398		goto skip_to;
399	case '{':
400		ptr = (char *) "#{";
401		goto do_replace;
402	default:
403		xsnprintf(tmp, sizeof tmp, "#%c", *(*iptr - 1));
404		ptr = tmp;
405		goto do_replace;
406	}
407
408	return;
409
410do_replace:
411	ptrlen = strlen(ptr);
412	if ((size_t) limit < ptrlen)
413		ptrlen = limit;
414
415	if (*optr + ptrlen >= out + outsize - 1)
416		return;
417	while (ptrlen > 0 && *ptr != '\0') {
418		*(*optr)++ = *ptr++;
419		ptrlen--;
420	}
421
422	return;
423
424skip_to:
425	*(*optr)++ = '#';
426
427	(*iptr)--;	/* include ch */
428	while (**iptr != ch && **iptr != '\0') {
429		if (*optr >=  out + outsize - 1)
430			break;
431		*(*optr)++ = *(*iptr)++;
432	}
433}
434
435/* Replace special sequences in fmt. */
436char *
437status_replace(struct client *c, struct winlink *wl, const char *fmt, time_t t,
438    int jobsflag)
439{
440	struct session		*s = NULL;
441	struct window_pane	*wp = NULL;
442	static char		 out[BUFSIZ];
443	char			 in[BUFSIZ], ch, *iptr, *optr, *expanded;
444	size_t			 len;
445	struct format_tree	*ft;
446
447	if (fmt == NULL)
448		return (xstrdup(""));
449
450	if (c != NULL)
451		s = c->session;
452	if (wl == NULL && s != NULL)
453		wl = s->curw;
454	if (wl != NULL)
455		wp = wl->window->active;
456
457	len = strftime(in, sizeof in, fmt, localtime(&t));
458	in[len] = '\0';
459
460	iptr = in;
461	optr = out;
462
463	while (*iptr != '\0') {
464		if (optr >= out + (sizeof out) - 1)
465			break;
466		ch = *iptr++;
467
468		if (ch != '#' || *iptr == '\0') {
469			*optr++ = ch;
470			continue;
471		}
472		status_replace1(c, &iptr, &optr, out, sizeof out, jobsflag);
473	}
474	*optr = '\0';
475
476	ft = format_create();
477	format_defaults(ft, c, s, wl, wp);
478	expanded = format_expand(ft, out);
479	format_free(ft);
480	return (expanded);
481}
482
483/* Figure out job name and get its result, starting it off if necessary. */
484char *
485status_find_job(struct client *c, char **iptr)
486{
487	struct status_out	*so, so_find;
488	char   			*cmd;
489	int			 lastesc;
490	size_t			 len;
491
492	if (**iptr == '\0')
493		return (NULL);
494	if (**iptr == ')') {		/* no command given */
495		(*iptr)++;
496		return (NULL);
497	}
498
499	cmd = xmalloc(strlen(*iptr) + 1);
500	len = 0;
501
502	lastesc = 0;
503	for (; **iptr != '\0'; (*iptr)++) {
504		if (!lastesc && **iptr == ')')
505			break;		/* unescaped ) is the end */
506		if (!lastesc && **iptr == '\\') {
507			lastesc = 1;
508			continue;	/* skip \ if not escaped */
509		}
510		lastesc = 0;
511		cmd[len++] = **iptr;
512	}
513	if (**iptr == '\0')		/* no terminating ) */ {
514		free(cmd);
515		return (NULL);
516	}
517	(*iptr)++;			/* skip final ) */
518	cmd[len] = '\0';
519
520	/* First try in the new tree. */
521	so_find.cmd = cmd;
522	so = RB_FIND(status_out_tree, &c->status_new, &so_find);
523	if (so != NULL && so->out != NULL) {
524		free(cmd);
525		return (so->out);
526	}
527
528	/* If not found at all, start the job and add to the tree. */
529	if (so == NULL) {
530		job_run(cmd, NULL, status_job_callback, status_job_free, c);
531		c->references++;
532
533		so = xmalloc(sizeof *so);
534		so->cmd = xstrdup(cmd);
535		so->out = NULL;
536		RB_INSERT(status_out_tree, &c->status_new, so);
537	}
538
539	/* Lookup in the old tree. */
540	so_find.cmd = cmd;
541	so = RB_FIND(status_out_tree, &c->status_old, &so_find);
542	free(cmd);
543	if (so != NULL)
544		return (so->out);
545	return (NULL);
546}
547
548/* Free job tree. */
549void
550status_free_jobs(struct status_out_tree *sotree)
551{
552	struct status_out	*so, *so_next;
553
554	so_next = RB_MIN(status_out_tree, sotree);
555	while (so_next != NULL) {
556		so = so_next;
557		so_next = RB_NEXT(status_out_tree, sotree, so);
558
559		RB_REMOVE(status_out_tree, sotree, so);
560		free(so->out);
561		free(so->cmd);
562		free(so);
563	}
564}
565
566/* Update jobs on status interval. */
567void
568status_update_jobs(struct client *c)
569{
570	/* Free the old tree. */
571	status_free_jobs(&c->status_old);
572
573	/* Move the new to old. */
574	memcpy(&c->status_old, &c->status_new, sizeof c->status_old);
575	RB_INIT(&c->status_new);
576}
577
578/* Free status job. */
579void
580status_job_free(void *data)
581{
582	struct client	*c = data;
583
584	c->references--;
585}
586
587/* Job has finished: save its result. */
588void
589status_job_callback(struct job *job)
590{
591	struct client		*c = job->data;
592	struct status_out	*so, so_find;
593	char			*line, *buf;
594	size_t			 len;
595
596	if (c->flags & CLIENT_DEAD)
597		return;
598
599	so_find.cmd = job->cmd;
600	so = RB_FIND(status_out_tree, &c->status_new, &so_find);
601	if (so == NULL || so->out != NULL)
602		return;
603
604	buf = NULL;
605	if ((line = evbuffer_readline(job->event->input)) == NULL) {
606		len = EVBUFFER_LENGTH(job->event->input);
607		buf = xmalloc(len + 1);
608		if (len != 0)
609			memcpy(buf, EVBUFFER_DATA(job->event->input), len);
610		buf[len] = '\0';
611	} else
612		buf = line;
613
614	so->out = buf;
615	server_status_client(c);
616}
617
618/* Return winlink status line entry and adjust gc as necessary. */
619char *
620status_print(struct client *c, struct winlink *wl, time_t t,
621    struct grid_cell *gc)
622{
623	struct options	*oo = &wl->window->options;
624	struct session	*s = c->session;
625	const char	*fmt;
626	char   		*text;
627
628	style_apply_update(gc, oo, "window-status-style");
629	fmt = options_get_string(oo, "window-status-format");
630	if (wl == s->curw) {
631		style_apply_update(gc, oo, "window-status-current-style");
632		fmt = options_get_string(oo, "window-status-current-format");
633	}
634	if (wl == TAILQ_FIRST(&s->lastw))
635		style_apply_update(gc, oo, "window-status-last-style");
636
637	if (wl->flags & WINLINK_BELL)
638		style_apply_update(gc, oo, "window-status-bell-style");
639	else if (wl->flags & (WINLINK_ACTIVITY|WINLINK_SILENCE))
640		style_apply_update(gc, oo, "window-status-activity-style");
641
642	text = status_replace(c, wl, fmt, t, 1);
643	return (text);
644}
645
646/* Set a status line message. */
647void
648status_message_set(struct client *c, const char *fmt, ...)
649{
650	struct timeval		 tv;
651	struct message_entry	*msg;
652	va_list			 ap;
653	int			 delay;
654	u_int			 i, limit;
655
656	status_prompt_clear(c);
657	status_message_clear(c);
658
659	va_start(ap, fmt);
660	xvasprintf(&c->message_string, fmt, ap);
661	va_end(ap);
662
663	ARRAY_EXPAND(&c->message_log, 1);
664	msg = &ARRAY_LAST(&c->message_log);
665	msg->msg_time = time(NULL);
666	msg->msg = xstrdup(c->message_string);
667
668	limit = options_get_number(&global_options, "message-limit");
669	if (ARRAY_LENGTH(&c->message_log) > limit) {
670		limit = ARRAY_LENGTH(&c->message_log) - limit;
671		for (i = 0; i < limit; i++) {
672			msg = &ARRAY_FIRST(&c->message_log);
673			free(msg->msg);
674			ARRAY_REMOVE(&c->message_log, 0);
675		}
676	}
677
678	delay = options_get_number(&c->session->options, "display-time");
679	tv.tv_sec = delay / 1000;
680	tv.tv_usec = (delay % 1000) * 1000L;
681
682	if (event_initialized(&c->message_timer))
683		evtimer_del(&c->message_timer);
684	evtimer_set(&c->message_timer, status_message_callback, c);
685	evtimer_add(&c->message_timer, &tv);
686
687	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
688	c->flags |= CLIENT_STATUS;
689}
690
691/* Clear status line message. */
692void
693status_message_clear(struct client *c)
694{
695	if (c->message_string == NULL)
696		return;
697
698	free(c->message_string);
699	c->message_string = NULL;
700
701	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
702	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
703
704	screen_reinit(&c->status);
705}
706
707/* Clear status line message after timer expires. */
708void
709status_message_callback(unused int fd, unused short event, void *data)
710{
711	struct client	*c = data;
712
713	status_message_clear(c);
714}
715
716/* Draw client message on status line of present else on last line. */
717int
718status_message_redraw(struct client *c)
719{
720	struct screen_write_ctx		ctx;
721	struct session		       *s = c->session;
722	struct screen		        old_status;
723	size_t			        len;
724	struct grid_cell		gc;
725	int				utf8flag;
726
727	if (c->tty.sx == 0 || c->tty.sy == 0)
728		return (0);
729	memcpy(&old_status, &c->status, sizeof old_status);
730	screen_init(&c->status, c->tty.sx, 1, 0);
731
732	utf8flag = options_get_number(&s->options, "status-utf8");
733
734	len = screen_write_strlen(utf8flag, "%s", c->message_string);
735	if (len > c->tty.sx)
736		len = c->tty.sx;
737
738	style_apply(&gc, &s->options, "message-style");
739
740	screen_write_start(&ctx, NULL, &c->status);
741
742	screen_write_cursormove(&ctx, 0, 0);
743	screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->message_string);
744	for (; len < c->tty.sx; len++)
745		screen_write_putc(&ctx, &gc, ' ');
746
747	screen_write_stop(&ctx);
748
749	if (grid_compare(c->status.grid, old_status.grid) == 0) {
750		screen_free(&old_status);
751		return (0);
752	}
753	screen_free(&old_status);
754	return (1);
755}
756
757/* Enable status line prompt. */
758void
759status_prompt_set(struct client *c, const char *msg, const char *input,
760    int (*callbackfn)(void *, const char *), void (*freefn)(void *),
761    void *data, int flags)
762{
763	int	keys;
764
765	status_message_clear(c);
766	status_prompt_clear(c);
767
768	c->prompt_string = status_replace(c, NULL, msg, time(NULL), 0);
769
770	c->prompt_buffer = status_replace(c, NULL, input, time(NULL), 0);
771	c->prompt_index = strlen(c->prompt_buffer);
772
773	c->prompt_callbackfn = callbackfn;
774	c->prompt_freefn = freefn;
775	c->prompt_data = data;
776
777	c->prompt_hindex = 0;
778
779	c->prompt_flags = flags;
780
781	keys = options_get_number(&c->session->options, "status-keys");
782	if (keys == MODEKEY_EMACS)
783		mode_key_init(&c->prompt_mdata, &mode_key_tree_emacs_edit);
784	else
785		mode_key_init(&c->prompt_mdata, &mode_key_tree_vi_edit);
786
787	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
788	c->flags |= CLIENT_STATUS;
789}
790
791/* Remove status line prompt. */
792void
793status_prompt_clear(struct client *c)
794{
795	if (c->prompt_string == NULL)
796		return;
797
798	if (c->prompt_freefn != NULL && c->prompt_data != NULL)
799		c->prompt_freefn(c->prompt_data);
800
801	free(c->prompt_string);
802	c->prompt_string = NULL;
803
804	free(c->prompt_buffer);
805	c->prompt_buffer = NULL;
806
807	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
808	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
809
810	screen_reinit(&c->status);
811}
812
813/* Update status line prompt with a new prompt string. */
814void
815status_prompt_update(struct client *c, const char *msg, const char *input)
816{
817	free(c->prompt_string);
818	c->prompt_string = status_replace(c, NULL, msg, time(NULL), 0);
819
820	free(c->prompt_buffer);
821	c->prompt_buffer = status_replace(c, NULL, input, time(NULL), 0);
822	c->prompt_index = strlen(c->prompt_buffer);
823
824	c->prompt_hindex = 0;
825
826	c->flags |= CLIENT_STATUS;
827}
828
829/* Draw client prompt on status line of present else on last line. */
830int
831status_prompt_redraw(struct client *c)
832{
833	struct screen_write_ctx		ctx;
834	struct session		       *s = c->session;
835	struct screen		        old_status;
836	size_t			        i, size, left, len, off;
837	struct grid_cell		gc, *gcp;
838	int				utf8flag;
839
840	if (c->tty.sx == 0 || c->tty.sy == 0)
841		return (0);
842	memcpy(&old_status, &c->status, sizeof old_status);
843	screen_init(&c->status, c->tty.sx, 1, 0);
844
845	utf8flag = options_get_number(&s->options, "status-utf8");
846
847	len = screen_write_strlen(utf8flag, "%s", c->prompt_string);
848	if (len > c->tty.sx)
849		len = c->tty.sx;
850	off = 0;
851
852	/* Change colours for command mode. */
853	if (c->prompt_mdata.mode == 1)
854		style_apply(&gc, &s->options, "message-command-style");
855	else
856		style_apply(&gc, &s->options, "message-style");
857
858	screen_write_start(&ctx, NULL, &c->status);
859
860	screen_write_cursormove(&ctx, 0, 0);
861	screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->prompt_string);
862
863	left = c->tty.sx - len;
864	if (left != 0) {
865		size = screen_write_strlen(utf8flag, "%s", c->prompt_buffer);
866		if (c->prompt_index >= left) {
867			off = c->prompt_index - left + 1;
868			if (c->prompt_index == size)
869				left--;
870			size = left;
871		}
872		screen_write_nputs(
873		    &ctx, left, &gc, utf8flag, "%s", c->prompt_buffer + off);
874
875		for (i = len + size; i < c->tty.sx; i++)
876			screen_write_putc(&ctx, &gc, ' ');
877	}
878
879	screen_write_stop(&ctx);
880
881	/* Apply fake cursor. */
882	off = len + c->prompt_index - off;
883	gcp = grid_view_get_cell(c->status.grid, off, 0);
884	gcp->attr ^= GRID_ATTR_REVERSE;
885
886	if (grid_compare(c->status.grid, old_status.grid) == 0) {
887		screen_free(&old_status);
888		return (0);
889	}
890	screen_free(&old_status);
891	return (1);
892}
893
894/* Handle keys in prompt. */
895void
896status_prompt_key(struct client *c, int key)
897{
898	struct session		*sess = c->session;
899	struct options		*oo = &sess->options;
900	struct paste_buffer	*pb;
901	char			*s, *first, *last, word[64], swapc;
902	const char		*histstr;
903	const char		*wsep = NULL;
904	u_char			 ch;
905	size_t			 size, n, off, idx;
906
907	size = strlen(c->prompt_buffer);
908	switch (mode_key_lookup(&c->prompt_mdata, key, NULL)) {
909	case MODEKEYEDIT_CURSORLEFT:
910		if (c->prompt_index > 0) {
911			c->prompt_index--;
912			c->flags |= CLIENT_STATUS;
913		}
914		break;
915	case MODEKEYEDIT_SWITCHMODE:
916		c->flags |= CLIENT_STATUS;
917		break;
918	case MODEKEYEDIT_SWITCHMODEAPPEND:
919		c->flags |= CLIENT_STATUS;
920		/* FALLTHROUGH */
921	case MODEKEYEDIT_CURSORRIGHT:
922		if (c->prompt_index < size) {
923			c->prompt_index++;
924			c->flags |= CLIENT_STATUS;
925		}
926		break;
927	case MODEKEYEDIT_SWITCHMODEBEGINLINE:
928		c->flags |= CLIENT_STATUS;
929		/* FALLTHROUGH */
930	case MODEKEYEDIT_STARTOFLINE:
931		if (c->prompt_index != 0) {
932			c->prompt_index = 0;
933			c->flags |= CLIENT_STATUS;
934		}
935		break;
936	case MODEKEYEDIT_SWITCHMODEAPPENDLINE:
937		c->flags |= CLIENT_STATUS;
938		/* FALLTHROUGH */
939	case MODEKEYEDIT_ENDOFLINE:
940		if (c->prompt_index != size) {
941			c->prompt_index = size;
942			c->flags |= CLIENT_STATUS;
943		}
944		break;
945	case MODEKEYEDIT_COMPLETE:
946		if (*c->prompt_buffer == '\0')
947			break;
948
949		idx = c->prompt_index;
950		if (idx != 0)
951			idx--;
952
953		/* Find the word we are in. */
954		first = c->prompt_buffer + idx;
955		while (first > c->prompt_buffer && *first != ' ')
956			first--;
957		while (*first == ' ')
958			first++;
959		last = c->prompt_buffer + idx;
960		while (*last != '\0' && *last != ' ')
961			last++;
962		while (*last == ' ')
963			last--;
964		if (*last != '\0')
965			last++;
966		if (last <= first ||
967		    ((size_t) (last - first)) > (sizeof word) - 1)
968			break;
969		memcpy(word, first, last - first);
970		word[last - first] = '\0';
971
972		/* And try to complete it. */
973		if ((s = status_prompt_complete(word)) == NULL)
974			break;
975
976		/* Trim out word. */
977		n = size - (last - c->prompt_buffer) + 1; /* with \0 */
978		memmove(first, last, n);
979		size -= last - first;
980
981		/* Insert the new word. */
982		size += strlen(s);
983		off = first - c->prompt_buffer;
984		c->prompt_buffer = xrealloc(c->prompt_buffer, size + 1);
985		first = c->prompt_buffer + off;
986		memmove(first + strlen(s), first, n);
987		memcpy(first, s, strlen(s));
988
989		c->prompt_index = (first - c->prompt_buffer) + strlen(s);
990		free(s);
991
992		c->flags |= CLIENT_STATUS;
993		break;
994	case MODEKEYEDIT_BACKSPACE:
995		if (c->prompt_index != 0) {
996			if (c->prompt_index == size)
997				c->prompt_buffer[--c->prompt_index] = '\0';
998			else {
999				memmove(c->prompt_buffer + c->prompt_index - 1,
1000				    c->prompt_buffer + c->prompt_index,
1001				    size + 1 - c->prompt_index);
1002				c->prompt_index--;
1003			}
1004			c->flags |= CLIENT_STATUS;
1005		}
1006		break;
1007	case MODEKEYEDIT_DELETE:
1008	case MODEKEYEDIT_SWITCHMODESUBSTITUTE:
1009		if (c->prompt_index != size) {
1010			memmove(c->prompt_buffer + c->prompt_index,
1011			    c->prompt_buffer + c->prompt_index + 1,
1012			    size + 1 - c->prompt_index);
1013			c->flags |= CLIENT_STATUS;
1014		}
1015		break;
1016	case MODEKEYEDIT_DELETELINE:
1017	case MODEKEYEDIT_SWITCHMODESUBSTITUTELINE:
1018		*c->prompt_buffer = '\0';
1019		c->prompt_index = 0;
1020		c->flags |= CLIENT_STATUS;
1021		break;
1022	case MODEKEYEDIT_DELETETOENDOFLINE:
1023	case MODEKEYEDIT_SWITCHMODECHANGELINE:
1024		if (c->prompt_index < size) {
1025			c->prompt_buffer[c->prompt_index] = '\0';
1026			c->flags |= CLIENT_STATUS;
1027		}
1028		break;
1029	case MODEKEYEDIT_DELETEWORD:
1030		wsep = options_get_string(oo, "word-separators");
1031		idx = c->prompt_index;
1032
1033		/* Find a non-separator. */
1034		while (idx != 0) {
1035			idx--;
1036			if (!strchr(wsep, c->prompt_buffer[idx]))
1037				break;
1038		}
1039
1040		/* Find the separator at the beginning of the word. */
1041		while (idx != 0) {
1042			idx--;
1043			if (strchr(wsep, c->prompt_buffer[idx])) {
1044				/* Go back to the word. */
1045				idx++;
1046				break;
1047			}
1048		}
1049
1050		memmove(c->prompt_buffer + idx,
1051		    c->prompt_buffer + c->prompt_index,
1052		    size + 1 - c->prompt_index);
1053		memset(c->prompt_buffer + size - (c->prompt_index - idx),
1054		    '\0', c->prompt_index - idx);
1055		c->prompt_index = idx;
1056		c->flags |= CLIENT_STATUS;
1057		break;
1058	case MODEKEYEDIT_NEXTSPACE:
1059		wsep = " ";
1060		/* FALLTHROUGH */
1061	case MODEKEYEDIT_NEXTWORD:
1062		if (wsep == NULL)
1063			wsep = options_get_string(oo, "word-separators");
1064
1065		/* Find a separator. */
1066		while (c->prompt_index != size) {
1067			c->prompt_index++;
1068			if (strchr(wsep, c->prompt_buffer[c->prompt_index]))
1069				break;
1070		}
1071
1072		/* Find the word right after the separation. */
1073		while (c->prompt_index != size) {
1074			c->prompt_index++;
1075			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1076				break;
1077		}
1078
1079		c->flags |= CLIENT_STATUS;
1080		break;
1081	case MODEKEYEDIT_NEXTSPACEEND:
1082		wsep = " ";
1083		/* FALLTHROUGH */
1084	case MODEKEYEDIT_NEXTWORDEND:
1085		if (wsep == NULL)
1086			wsep = options_get_string(oo, "word-separators");
1087
1088		/* Find a word. */
1089		while (c->prompt_index != size) {
1090			c->prompt_index++;
1091			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1092				break;
1093		}
1094
1095		/* Find the separator at the end of the word. */
1096		while (c->prompt_index != size) {
1097			c->prompt_index++;
1098			if (strchr(wsep, c->prompt_buffer[c->prompt_index]))
1099				break;
1100		}
1101
1102		/* Back up to the end-of-word like vi. */
1103		if (options_get_number(oo, "status-keys") == MODEKEY_VI &&
1104		    c->prompt_index != 0)
1105			c->prompt_index--;
1106
1107		c->flags |= CLIENT_STATUS;
1108		break;
1109	case MODEKEYEDIT_PREVIOUSSPACE:
1110		wsep = " ";
1111		/* FALLTHROUGH */
1112	case MODEKEYEDIT_PREVIOUSWORD:
1113		if (wsep == NULL)
1114			wsep = options_get_string(oo, "word-separators");
1115
1116		/* Find a non-separator. */
1117		while (c->prompt_index != 0) {
1118			c->prompt_index--;
1119			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1120				break;
1121		}
1122
1123		/* Find the separator at the beginning of the word. */
1124		while (c->prompt_index != 0) {
1125			c->prompt_index--;
1126			if (strchr(wsep, c->prompt_buffer[c->prompt_index])) {
1127				/* Go back to the word. */
1128				c->prompt_index++;
1129				break;
1130			}
1131		}
1132
1133		c->flags |= CLIENT_STATUS;
1134		break;
1135	case MODEKEYEDIT_HISTORYUP:
1136		histstr = status_prompt_up_history(&c->prompt_hindex);
1137		if (histstr == NULL)
1138			break;
1139		free(c->prompt_buffer);
1140		c->prompt_buffer = xstrdup(histstr);
1141		c->prompt_index = strlen(c->prompt_buffer);
1142		c->flags |= CLIENT_STATUS;
1143		break;
1144	case MODEKEYEDIT_HISTORYDOWN:
1145		histstr = status_prompt_down_history(&c->prompt_hindex);
1146		if (histstr == NULL)
1147			break;
1148		free(c->prompt_buffer);
1149		c->prompt_buffer = xstrdup(histstr);
1150		c->prompt_index = strlen(c->prompt_buffer);
1151		c->flags |= CLIENT_STATUS;
1152		break;
1153	case MODEKEYEDIT_PASTE:
1154		if ((pb = paste_get_top()) == NULL)
1155			break;
1156		for (n = 0; n < pb->size; n++) {
1157			ch = (u_char) pb->data[n];
1158			if (ch < 32 || ch == 127)
1159				break;
1160		}
1161
1162		c->prompt_buffer = xrealloc(c->prompt_buffer, size + n + 1);
1163		if (c->prompt_index == size) {
1164			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
1165			c->prompt_index += n;
1166			c->prompt_buffer[c->prompt_index] = '\0';
1167		} else {
1168			memmove(c->prompt_buffer + c->prompt_index + n,
1169			    c->prompt_buffer + c->prompt_index,
1170			    size + 1 - c->prompt_index);
1171			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
1172			c->prompt_index += n;
1173		}
1174
1175		c->flags |= CLIENT_STATUS;
1176		break;
1177	case MODEKEYEDIT_TRANSPOSECHARS:
1178		idx = c->prompt_index;
1179		if (idx < size)
1180			idx++;
1181		if (idx >= 2) {
1182			swapc = c->prompt_buffer[idx - 2];
1183			c->prompt_buffer[idx - 2] = c->prompt_buffer[idx - 1];
1184			c->prompt_buffer[idx - 1] = swapc;
1185			c->prompt_index = idx;
1186			c->flags |= CLIENT_STATUS;
1187		}
1188		break;
1189	case MODEKEYEDIT_ENTER:
1190		if (*c->prompt_buffer != '\0')
1191			status_prompt_add_history(c->prompt_buffer);
1192		if (c->prompt_callbackfn(c->prompt_data, c->prompt_buffer) == 0)
1193			status_prompt_clear(c);
1194		break;
1195	case MODEKEYEDIT_CANCEL:
1196		if (c->prompt_callbackfn(c->prompt_data, NULL) == 0)
1197			status_prompt_clear(c);
1198		break;
1199	case MODEKEY_OTHER:
1200		if ((key & 0xff00) != 0 || key < 32 || key == 127)
1201			break;
1202		c->prompt_buffer = xrealloc(c->prompt_buffer, size + 2);
1203
1204		if (c->prompt_index == size) {
1205			c->prompt_buffer[c->prompt_index++] = key;
1206			c->prompt_buffer[c->prompt_index] = '\0';
1207		} else {
1208			memmove(c->prompt_buffer + c->prompt_index + 1,
1209			    c->prompt_buffer + c->prompt_index,
1210			    size + 1 - c->prompt_index);
1211			c->prompt_buffer[c->prompt_index++] = key;
1212		}
1213
1214		if (c->prompt_flags & PROMPT_SINGLE) {
1215			if (c->prompt_callbackfn(
1216			    c->prompt_data, c->prompt_buffer) == 0)
1217				status_prompt_clear(c);
1218		}
1219
1220		c->flags |= CLIENT_STATUS;
1221		break;
1222	default:
1223		break;
1224	}
1225}
1226
1227/* Get previous line from the history. */
1228const char *
1229status_prompt_up_history(u_int *idx)
1230{
1231	u_int size;
1232
1233	/*
1234	 * History runs from 0 to size - 1.
1235	 *
1236	 * Index is from 0 to size. Zero is empty.
1237	 */
1238
1239	size = ARRAY_LENGTH(&status_prompt_history);
1240	if (size == 0 || *idx == size)
1241		return (NULL);
1242	(*idx)++;
1243	return (ARRAY_ITEM(&status_prompt_history, size - *idx));
1244}
1245
1246/* Get next line from the history. */
1247const char *
1248status_prompt_down_history(u_int *idx)
1249{
1250	u_int size;
1251
1252	size = ARRAY_LENGTH(&status_prompt_history);
1253	if (size == 0 || *idx == 0)
1254		return ("");
1255	(*idx)--;
1256	if (*idx == 0)
1257		return ("");
1258	return (ARRAY_ITEM(&status_prompt_history, size - *idx));
1259}
1260
1261/* Add line to the history. */
1262void
1263status_prompt_add_history(const char *line)
1264{
1265	u_int size;
1266
1267	size = ARRAY_LENGTH(&status_prompt_history);
1268	if (size > 0 && strcmp(ARRAY_LAST(&status_prompt_history), line) == 0)
1269		return;
1270
1271	if (size == PROMPT_HISTORY) {
1272		free(ARRAY_FIRST(&status_prompt_history));
1273		ARRAY_REMOVE(&status_prompt_history, 0);
1274	}
1275
1276	ARRAY_ADD(&status_prompt_history, xstrdup(line));
1277}
1278
1279/* Complete word. */
1280char *
1281status_prompt_complete(const char *s)
1282{
1283	const struct cmd_entry 	  	       **cmdent;
1284	const struct options_table_entry	*oe;
1285	ARRAY_DECL(, const char *)		 list;
1286	char					*prefix, *s2;
1287	u_int					 i;
1288	size_t				 	 j;
1289
1290	if (*s == '\0')
1291		return (NULL);
1292
1293	/* First, build a list of all the possible matches. */
1294	ARRAY_INIT(&list);
1295	for (cmdent = cmd_table; *cmdent != NULL; cmdent++) {
1296		if (strncmp((*cmdent)->name, s, strlen(s)) == 0)
1297			ARRAY_ADD(&list, (*cmdent)->name);
1298	}
1299	for (oe = server_options_table; oe->name != NULL; oe++) {
1300		if (strncmp(oe->name, s, strlen(s)) == 0)
1301			ARRAY_ADD(&list, oe->name);
1302	}
1303	for (oe = session_options_table; oe->name != NULL; oe++) {
1304		if (strncmp(oe->name, s, strlen(s)) == 0)
1305			ARRAY_ADD(&list, oe->name);
1306	}
1307	for (oe = window_options_table; oe->name != NULL; oe++) {
1308		if (strncmp(oe->name, s, strlen(s)) == 0)
1309			ARRAY_ADD(&list, oe->name);
1310	}
1311
1312	/* If none, bail now. */
1313	if (ARRAY_LENGTH(&list) == 0) {
1314		ARRAY_FREE(&list);
1315		return (NULL);
1316	}
1317
1318	/* If an exact match, return it, with a trailing space. */
1319	if (ARRAY_LENGTH(&list) == 1) {
1320		xasprintf(&s2, "%s ", ARRAY_FIRST(&list));
1321		ARRAY_FREE(&list);
1322		return (s2);
1323	}
1324
1325	/* Now loop through the list and find the longest common prefix. */
1326	prefix = xstrdup(ARRAY_FIRST(&list));
1327	for (i = 1; i < ARRAY_LENGTH(&list); i++) {
1328		s = ARRAY_ITEM(&list, i);
1329
1330		j = strlen(s);
1331		if (j > strlen(prefix))
1332			j = strlen(prefix);
1333		for (; j > 0; j--) {
1334			if (prefix[j - 1] != s[j - 1])
1335				prefix[j - 1] = '\0';
1336		}
1337	}
1338
1339	ARRAY_FREE(&list);
1340	return (prefix);
1341}
1342