status.c revision 1.147 
1/* $OpenBSD: status.c,v 1.147 2016/01/01 08:04:20 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(struct client *, time_t, struct grid_cell *,
33	    size_t *);
34char   *status_redraw_get_right(struct client *, time_t, struct grid_cell *,
35	    size_t *);
36char   *status_print(struct client *, struct winlink *, time_t,
37	    struct grid_cell *);
38char   *status_replace(struct client *, struct winlink *, const char *, time_t);
39void	status_message_callback(int, short, void *);
40void	status_timer_callback(int, short, void *);
41
42const char *status_prompt_up_history(u_int *);
43const char *status_prompt_down_history(u_int *);
44void	status_prompt_add_history(const char *);
45
46const char **status_prompt_complete_list(u_int *, const char *);
47char   *status_prompt_complete_prefix(const char **, u_int);
48char   *status_prompt_complete(struct session *, const char *);
49
50char   *status_prompt_find_history_file(void);
51
52/* Status prompt history. */
53#define PROMPT_HISTORY 100
54char	**status_prompt_hlist;
55u_int	  status_prompt_hsize;
56
57/* Find the history file to load/save from/to. */
58char *
59status_prompt_find_history_file(void)
60{
61	const char	*home, *history_file;
62	char		*path;
63
64	history_file = options_get_string(global_options, "history-file");
65	if (*history_file == '\0')
66		return (NULL);
67	if (*history_file == '/')
68		return (xstrdup(history_file));
69
70	if (history_file[0] != '~' || history_file[1] != '/')
71		return (NULL);
72	if ((home = find_home()) == NULL)
73		return (NULL);
74	xasprintf(&path, "%s%s", home, history_file + 1);
75	return (path);
76}
77
78/* Load status prompt history from file. */
79void
80status_prompt_load_history(void)
81{
82	FILE	*f;
83	char	*history_file, *line, *tmp;
84	size_t	 length;
85
86	if ((history_file = status_prompt_find_history_file()) == NULL)
87		return;
88	log_debug("loading history from %s", history_file);
89
90	f = fopen(history_file, "r");
91	if (f == NULL) {
92		log_debug("%s: %s", history_file, strerror(errno));
93		free(history_file);
94		return;
95	}
96	free(history_file);
97
98	for (;;) {
99		if ((line = fgetln(f, &length)) == NULL)
100			break;
101
102		if (length > 0) {
103			if (line[length - 1] == '\n') {
104				line[length - 1] = '\0';
105				status_prompt_add_history(line);
106			} else {
107				tmp = xmalloc(length + 1);
108				memcpy(tmp, line, length);
109				tmp[length] = '\0';
110				status_prompt_add_history(tmp);
111				free(tmp);
112			}
113		}
114	}
115	fclose(f);
116}
117
118/* Save status prompt history to file. */
119void
120status_prompt_save_history(void)
121{
122	FILE	*f;
123	u_int	 i;
124	char	*history_file;
125
126	if ((history_file = status_prompt_find_history_file()) == NULL)
127		return;
128	log_debug("saving history to %s", history_file);
129
130	f = fopen(history_file, "w");
131	if (f == NULL) {
132		log_debug("%s: %s", history_file, strerror(errno));
133		free(history_file);
134		return;
135	}
136	free(history_file);
137
138	for (i = 0; i < status_prompt_hsize; i++) {
139		fputs(status_prompt_hlist[i], f);
140		fputc('\n', f);
141	}
142	fclose(f);
143
144}
145
146/* Status timer callback. */
147void
148status_timer_callback(__unused int fd, __unused short events, void *arg)
149{
150	struct client	*c = arg;
151	struct session	*s = c->session;
152	struct timeval	 tv;
153
154	evtimer_del(&c->status_timer);
155
156	if (s == NULL)
157		return;
158
159	if (c->message_string == NULL && c->prompt_string == NULL)
160		c->flags |= CLIENT_STATUS;
161
162	timerclear(&tv);
163	tv.tv_sec = options_get_number(s->options, "status-interval");
164
165	if (tv.tv_sec != 0)
166		evtimer_add(&c->status_timer, &tv);
167	log_debug("client %p, status interval %d", c, (int)tv.tv_sec);
168}
169
170/* Start status timer for client. */
171void
172status_timer_start(struct client *c)
173{
174	struct session	*s = c->session;
175
176	if (event_initialized(&c->status_timer))
177		evtimer_del(&c->status_timer);
178	else
179		evtimer_set(&c->status_timer, status_timer_callback, c);
180
181	if (s != NULL && options_get_number(s->options, "status"))
182		status_timer_callback(-1, 0, c);
183}
184
185/* Start status timer for all clients. */
186void
187status_timer_start_all(void)
188{
189	struct client	*c;
190
191	TAILQ_FOREACH(c, &clients, entry)
192		status_timer_start(c);
193}
194
195/* Get screen line of status line. -1 means off. */
196int
197status_at_line(struct client *c)
198{
199	struct session	*s = c->session;
200
201	if (!options_get_number(s->options, "status"))
202		return (-1);
203
204	if (options_get_number(s->options, "status-position") == 0)
205		return (0);
206	return (c->tty.sy - 1);
207}
208
209/* Retrieve options for left string. */
210char *
211status_redraw_get_left(struct client *c, time_t t, struct grid_cell *gc,
212    size_t *size)
213{
214	struct session	*s = c->session;
215	const char	*template;
216	char		*left;
217	size_t		 leftlen;
218
219	style_apply_update(gc, s->options, "status-left-style");
220
221	template = options_get_string(s->options, "status-left");
222	left = status_replace(c, NULL, template, t);
223
224	*size = options_get_number(s->options, "status-left-length");
225	leftlen = screen_write_cstrlen("%s", left);
226	if (leftlen < *size)
227		*size = leftlen;
228	return (left);
229}
230
231/* Retrieve options for right string. */
232char *
233status_redraw_get_right(struct client *c, time_t t, struct grid_cell *gc,
234    size_t *size)
235{
236	struct session	*s = c->session;
237	const char	*template;
238	char		*right;
239	size_t		 rightlen;
240
241	style_apply_update(gc, s->options, "status-right-style");
242
243	template = options_get_string(s->options, "status-right");
244	right = status_replace(c, NULL, template, t);
245
246	*size = options_get_number(s->options, "status-right-length");
247	rightlen = screen_write_cstrlen("%s", right);
248	if (rightlen < *size)
249		*size = rightlen;
250	return (right);
251}
252
253/* Get window at window list position. */
254struct window *
255status_get_window_at(struct client *c, u_int x)
256{
257	struct session	*s = c->session;
258	struct winlink	*wl;
259	struct options	*oo;
260	size_t		 len;
261
262	x += c->wlmouse;
263	RB_FOREACH(wl, winlinks, &s->windows) {
264		oo = wl->window->options;
265		len = strlen(options_get_string(oo, "window-status-separator"));
266
267		if (x < wl->status_width)
268			return (wl->window);
269		x -= wl->status_width + len;
270	}
271	return (NULL);
272}
273
274/* Draw status for client on the last lines of given context. */
275int
276status_redraw(struct client *c)
277{
278	struct screen_write_ctx	ctx;
279	struct session	       *s = c->session;
280	struct winlink	       *wl;
281	struct screen		old_status, window_list;
282	struct grid_cell	stdgc, lgc, rgc, gc;
283	struct options	       *oo;
284	time_t			t;
285	char		       *left, *right, *sep;
286	u_int			offset, needed;
287	u_int			wlstart, wlwidth, wlavailable, wloffset, wlsize;
288	size_t			llen, rlen, seplen;
289	int			larrow, rarrow;
290
291	/* No status line? */
292	if (c->tty.sy == 0 || !options_get_number(s->options, "status"))
293		return (1);
294	left = right = NULL;
295	larrow = rarrow = 0;
296
297	/* Store current time. */
298	t = time(NULL);
299
300	/* Set up default colour. */
301	style_apply(&stdgc, s->options, "status-style");
302
303	/* Create the target screen. */
304	memcpy(&old_status, &c->status, sizeof old_status);
305	screen_init(&c->status, c->tty.sx, 1, 0);
306	screen_write_start(&ctx, NULL, &c->status);
307	for (offset = 0; offset < c->tty.sx; offset++)
308		screen_write_putc(&ctx, &stdgc, ' ');
309	screen_write_stop(&ctx);
310
311	/* If the height is one line, blank status line. */
312	if (c->tty.sy <= 1)
313		goto out;
314
315	/* Work out left and right strings. */
316	memcpy(&lgc, &stdgc, sizeof lgc);
317	left = status_redraw_get_left(c, t, &lgc, &llen);
318	memcpy(&rgc, &stdgc, sizeof rgc);
319	right = status_redraw_get_right(c, t, &rgc, &rlen);
320
321	/*
322	 * Figure out how much space we have for the window list. If there
323	 * isn't enough space, just show a blank status line.
324	 */
325	needed = 0;
326	if (llen != 0)
327		needed += llen;
328	if (rlen != 0)
329		needed += rlen;
330	if (c->tty.sx == 0 || c->tty.sx <= needed)
331		goto out;
332	wlavailable = c->tty.sx - needed;
333
334	/* Calculate the total size needed for the window list. */
335	wlstart = wloffset = wlwidth = 0;
336	RB_FOREACH(wl, winlinks, &s->windows) {
337		free(wl->status_text);
338		memcpy(&wl->status_cell, &stdgc, sizeof wl->status_cell);
339		wl->status_text = status_print(c, wl, t, &wl->status_cell);
340		wl->status_width = screen_write_cstrlen("%s", wl->status_text);
341
342		if (wl == s->curw)
343			wloffset = wlwidth;
344
345		oo = wl->window->options;
346		sep = options_get_string(oo, "window-status-separator");
347		seplen = screen_write_strlen("%s", sep);
348		wlwidth += wl->status_width + seplen;
349	}
350
351	/* Create a new screen for the window list. */
352	screen_init(&window_list, wlwidth, 1, 0);
353
354	/* And draw the window list into it. */
355	screen_write_start(&ctx, NULL, &window_list);
356	RB_FOREACH(wl, winlinks, &s->windows) {
357		screen_write_cnputs(&ctx, -1, &wl->status_cell, "%s",
358		    wl->status_text);
359
360		oo = wl->window->options;
361		sep = options_get_string(oo, "window-status-separator");
362		screen_write_nputs(&ctx, -1, &stdgc, "%s", sep);
363	}
364	screen_write_stop(&ctx);
365
366	/* If there is enough space for the total width, skip to draw now. */
367	if (wlwidth <= wlavailable)
368		goto draw;
369
370	/* Find size of current window text. */
371	wlsize = s->curw->status_width;
372
373	/*
374	 * If the current window is already on screen, good to draw from the
375	 * start and just leave off the end.
376	 */
377	if (wloffset + wlsize < wlavailable) {
378		if (wlavailable > 0) {
379			rarrow = 1;
380			wlavailable--;
381		}
382		wlwidth = wlavailable;
383	} else {
384		/*
385		 * Work out how many characters we need to omit from the
386		 * start. There are wlavailable characters to fill, and
387		 * wloffset + wlsize must be the last. So, the start character
388		 * is wloffset + wlsize - wlavailable.
389		 */
390		if (wlavailable > 0) {
391			larrow = 1;
392			wlavailable--;
393		}
394
395		wlstart = wloffset + wlsize - wlavailable;
396		if (wlavailable > 0 && wlwidth > wlstart + wlavailable + 1) {
397			rarrow = 1;
398			wlstart++;
399			wlavailable--;
400		}
401		wlwidth = wlavailable;
402	}
403
404	/* Bail if anything is now too small too. */
405	if (wlwidth == 0 || wlavailable == 0) {
406		screen_free(&window_list);
407		goto out;
408	}
409
410	/*
411	 * Now the start position is known, work out the state of the left and
412	 * right arrows.
413	 */
414	offset = 0;
415	RB_FOREACH(wl, winlinks, &s->windows) {
416		if (wl->flags & WINLINK_ALERTFLAGS &&
417		    larrow == 1 && offset < wlstart)
418			larrow = -1;
419
420		offset += wl->status_width;
421
422		if (wl->flags & WINLINK_ALERTFLAGS &&
423		    rarrow == 1 && offset > wlstart + wlwidth)
424			rarrow = -1;
425	}
426
427draw:
428	/* Begin drawing. */
429	screen_write_start(&ctx, NULL, &c->status);
430
431	/* Draw the left string and arrow. */
432	screen_write_cursormove(&ctx, 0, 0);
433	if (llen != 0)
434		screen_write_cnputs(&ctx, llen, &lgc, "%s", left);
435	if (larrow != 0) {
436		memcpy(&gc, &stdgc, sizeof gc);
437		if (larrow == -1)
438			gc.attr ^= GRID_ATTR_REVERSE;
439		screen_write_putc(&ctx, &gc, '<');
440	}
441
442	/* Draw the right string and arrow. */
443	if (rarrow != 0) {
444		screen_write_cursormove(&ctx, c->tty.sx - rlen - 1, 0);
445		memcpy(&gc, &stdgc, sizeof gc);
446		if (rarrow == -1)
447			gc.attr ^= GRID_ATTR_REVERSE;
448		screen_write_putc(&ctx, &gc, '>');
449	} else
450		screen_write_cursormove(&ctx, c->tty.sx - rlen, 0);
451	if (rlen != 0)
452		screen_write_cnputs(&ctx, rlen, &rgc, "%s", right);
453
454	/* Figure out the offset for the window list. */
455	if (llen != 0)
456		wloffset = llen;
457	else
458		wloffset = 0;
459	if (wlwidth < wlavailable) {
460		switch (options_get_number(s->options, "status-justify")) {
461		case 1:	/* centred */
462			wloffset += (wlavailable - wlwidth) / 2;
463			break;
464		case 2:	/* right */
465			wloffset += (wlavailable - wlwidth);
466			break;
467		}
468	}
469	if (larrow != 0)
470		wloffset++;
471
472	/* Copy the window list. */
473	c->wlmouse = -wloffset + wlstart;
474	screen_write_cursormove(&ctx, wloffset, 0);
475	screen_write_copy(&ctx, &window_list, wlstart, 0, wlwidth, 1);
476	screen_free(&window_list);
477
478	screen_write_stop(&ctx);
479
480out:
481	free(left);
482	free(right);
483
484	if (grid_compare(c->status.grid, old_status.grid) == 0) {
485		screen_free(&old_status);
486		return (0);
487	}
488	screen_free(&old_status);
489	return (1);
490}
491
492/* Replace special sequences in fmt. */
493char *
494status_replace(struct client *c, struct winlink *wl, const char *fmt, time_t t)
495{
496	struct format_tree	*ft;
497	char			*expanded;
498
499	if (fmt == NULL)
500		return (xstrdup(""));
501
502	if (c->flags & CLIENT_STATUSFORCE)
503		ft = format_create(NULL, FORMAT_STATUS|FORMAT_FORCE);
504	else
505		ft = format_create(NULL, FORMAT_STATUS);
506	format_defaults(ft, c, NULL, wl, NULL);
507
508	expanded = format_expand_time(ft, fmt, t);
509
510	format_free(ft);
511	return (expanded);
512}
513
514/* Return winlink status line entry and adjust gc as necessary. */
515char *
516status_print(struct client *c, struct winlink *wl, time_t t,
517    struct grid_cell *gc)
518{
519	struct options	*oo = wl->window->options;
520	struct session	*s = c->session;
521	const char	*fmt;
522	char   		*text;
523
524	style_apply_update(gc, oo, "window-status-style");
525	fmt = options_get_string(oo, "window-status-format");
526	if (wl == s->curw) {
527		style_apply_update(gc, oo, "window-status-current-style");
528		fmt = options_get_string(oo, "window-status-current-format");
529	}
530	if (wl == TAILQ_FIRST(&s->lastw))
531		style_apply_update(gc, oo, "window-status-last-style");
532
533	if (wl->flags & WINLINK_BELL)
534		style_apply_update(gc, oo, "window-status-bell-style");
535	else if (wl->flags & (WINLINK_ACTIVITY|WINLINK_SILENCE))
536		style_apply_update(gc, oo, "window-status-activity-style");
537
538	text = status_replace(c, wl, fmt, t);
539	return (text);
540}
541
542/* Set a status line message. */
543void
544status_message_set(struct client *c, const char *fmt, ...)
545{
546	struct timeval		 tv;
547	struct message_entry	*msg, *msg1;
548	va_list			 ap;
549	int			 delay;
550	u_int			 limit;
551
552	limit = options_get_number(global_options, "message-limit");
553
554	status_prompt_clear(c);
555	status_message_clear(c);
556
557	va_start(ap, fmt);
558	xvasprintf(&c->message_string, fmt, ap);
559	va_end(ap);
560
561	msg = xcalloc(1, sizeof *msg);
562	msg->msg_time = time(NULL);
563	msg->msg_num = c->message_next++;
564	msg->msg = xstrdup(c->message_string);
565	TAILQ_INSERT_TAIL(&c->message_log, msg, entry);
566
567	TAILQ_FOREACH_SAFE(msg, &c->message_log, entry, msg1) {
568		if (msg->msg_num + limit >= c->message_next)
569			break;
570		free(msg->msg);
571		TAILQ_REMOVE(&c->message_log, msg, entry);
572		free(msg);
573	}
574
575	delay = options_get_number(c->session->options, "display-time");
576	if (delay > 0) {
577		tv.tv_sec = delay / 1000;
578		tv.tv_usec = (delay % 1000) * 1000L;
579
580		if (event_initialized(&c->message_timer))
581			evtimer_del(&c->message_timer);
582		evtimer_set(&c->message_timer, status_message_callback, c);
583		evtimer_add(&c->message_timer, &tv);
584	}
585
586	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
587	c->flags |= CLIENT_STATUS;
588}
589
590/* Clear status line message. */
591void
592status_message_clear(struct client *c)
593{
594	if (c->message_string == NULL)
595		return;
596
597	free(c->message_string);
598	c->message_string = NULL;
599
600	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
601	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
602
603	screen_reinit(&c->status);
604}
605
606/* Clear status line message after timer expires. */
607void
608status_message_callback(__unused int fd, __unused short event, void *data)
609{
610	struct client	*c = data;
611
612	status_message_clear(c);
613}
614
615/* Draw client message on status line of present else on last line. */
616int
617status_message_redraw(struct client *c)
618{
619	struct screen_write_ctx		ctx;
620	struct session		       *s = c->session;
621	struct screen		        old_status;
622	size_t			        len;
623	struct grid_cell		gc;
624
625	if (c->tty.sx == 0 || c->tty.sy == 0)
626		return (0);
627	memcpy(&old_status, &c->status, sizeof old_status);
628	screen_init(&c->status, c->tty.sx, 1, 0);
629
630	len = screen_write_strlen("%s", c->message_string);
631	if (len > c->tty.sx)
632		len = c->tty.sx;
633
634	style_apply(&gc, s->options, "message-style");
635
636	screen_write_start(&ctx, NULL, &c->status);
637
638	screen_write_cursormove(&ctx, 0, 0);
639	screen_write_nputs(&ctx, len, &gc, "%s", c->message_string);
640	for (; len < c->tty.sx; len++)
641		screen_write_putc(&ctx, &gc, ' ');
642
643	screen_write_stop(&ctx);
644
645	if (grid_compare(c->status.grid, old_status.grid) == 0) {
646		screen_free(&old_status);
647		return (0);
648	}
649	screen_free(&old_status);
650	return (1);
651}
652
653/* Enable status line prompt. */
654void
655status_prompt_set(struct client *c, const char *msg, const char *input,
656    int (*callbackfn)(void *, const char *), void (*freefn)(void *),
657    void *data, int flags)
658{
659	struct format_tree	*ft;
660	int			 keys;
661	time_t			 t;
662
663	ft = format_create(NULL, 0);
664	format_defaults(ft, c, NULL, NULL, NULL);
665	t = time(NULL);
666
667	status_message_clear(c);
668	status_prompt_clear(c);
669
670	c->prompt_string = format_expand_time(ft, msg, t);
671
672	c->prompt_buffer = format_expand_time(ft, input, t);
673	c->prompt_index = strlen(c->prompt_buffer);
674
675	c->prompt_callbackfn = callbackfn;
676	c->prompt_freefn = freefn;
677	c->prompt_data = data;
678
679	c->prompt_hindex = 0;
680
681	c->prompt_flags = flags;
682
683	keys = options_get_number(c->session->options, "status-keys");
684	if (keys == MODEKEY_EMACS)
685		mode_key_init(&c->prompt_mdata, &mode_key_tree_emacs_edit);
686	else
687		mode_key_init(&c->prompt_mdata, &mode_key_tree_vi_edit);
688
689	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
690	c->flags |= CLIENT_STATUS;
691
692	format_free(ft);
693}
694
695/* Remove status line prompt. */
696void
697status_prompt_clear(struct client *c)
698{
699	if (c->prompt_string == NULL)
700		return;
701
702	if (c->prompt_freefn != NULL && c->prompt_data != NULL)
703		c->prompt_freefn(c->prompt_data);
704
705	free(c->prompt_string);
706	c->prompt_string = NULL;
707
708	free(c->prompt_buffer);
709	c->prompt_buffer = NULL;
710
711	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
712	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
713
714	screen_reinit(&c->status);
715}
716
717/* Update status line prompt with a new prompt string. */
718void
719status_prompt_update(struct client *c, const char *msg, const char *input)
720{
721	struct format_tree	*ft;
722	time_t			 t;
723
724	ft = format_create(NULL, 0);
725	format_defaults(ft, c, NULL, NULL, NULL);
726	t = time(NULL);
727
728	free(c->prompt_string);
729	c->prompt_string = format_expand_time(ft, msg, t);
730
731	free(c->prompt_buffer);
732	c->prompt_buffer = format_expand_time(ft, input, t);
733	c->prompt_index = strlen(c->prompt_buffer);
734
735	c->prompt_hindex = 0;
736
737	c->flags |= CLIENT_STATUS;
738
739	format_free(ft);
740}
741
742/* Draw client prompt on status line of present else on last line. */
743int
744status_prompt_redraw(struct client *c)
745{
746	struct screen_write_ctx		ctx;
747	struct session		       *s = c->session;
748	struct screen		        old_status;
749	size_t			        i, size, left, len, off;
750	struct grid_cell		gc;
751
752	if (c->tty.sx == 0 || c->tty.sy == 0)
753		return (0);
754	memcpy(&old_status, &c->status, sizeof old_status);
755	screen_init(&c->status, c->tty.sx, 1, 0);
756
757	len = screen_write_strlen("%s", c->prompt_string);
758	if (len > c->tty.sx)
759		len = c->tty.sx;
760	off = 0;
761
762	/* Change colours for command mode. */
763	if (c->prompt_mdata.mode == 1)
764		style_apply(&gc, s->options, "message-command-style");
765	else
766		style_apply(&gc, s->options, "message-style");
767
768	screen_write_start(&ctx, NULL, &c->status);
769
770	screen_write_cursormove(&ctx, 0, 0);
771	screen_write_nputs(&ctx, len, &gc, "%s", c->prompt_string);
772
773	left = c->tty.sx - len;
774	if (left != 0) {
775		size = screen_write_strlen("%s", c->prompt_buffer);
776		if (c->prompt_index >= left) {
777			off = c->prompt_index - left + 1;
778			if (c->prompt_index == size)
779				left--;
780			size = left;
781		}
782		screen_write_nputs(&ctx, left, &gc, "%s", c->prompt_buffer +
783		    off);
784
785		for (i = len + size; i < c->tty.sx; i++)
786			screen_write_putc(&ctx, &gc, ' ');
787	}
788
789	screen_write_stop(&ctx);
790
791	/* Apply fake cursor. */
792	off = len + c->prompt_index - off;
793	grid_view_get_cell(c->status.grid, off, 0, &gc);
794	gc.attr ^= GRID_ATTR_REVERSE;
795	grid_view_set_cell(c->status.grid, off, 0, &gc);
796
797	if (grid_compare(c->status.grid, old_status.grid) == 0) {
798		screen_free(&old_status);
799		return (0);
800	}
801	screen_free(&old_status);
802	return (1);
803}
804
805/* Handle keys in prompt. */
806void
807status_prompt_key(struct client *c, key_code key)
808{
809	struct session		*sess = c->session;
810	struct options		*oo = sess->options;
811	struct paste_buffer	*pb;
812	char			*s, *first, *last, word[64], swapc;
813	const char		*histstr, *bufdata, *wsep = NULL;
814	u_char			 ch;
815	size_t			 size, n, off, idx, bufsize;
816
817	size = strlen(c->prompt_buffer);
818	switch (mode_key_lookup(&c->prompt_mdata, key, NULL)) {
819	case MODEKEYEDIT_CURSORLEFT:
820		if (c->prompt_index > 0) {
821			c->prompt_index--;
822			c->flags |= CLIENT_STATUS;
823		}
824		break;
825	case MODEKEYEDIT_SWITCHMODE:
826		c->flags |= CLIENT_STATUS;
827		break;
828	case MODEKEYEDIT_SWITCHMODEAPPEND:
829		c->flags |= CLIENT_STATUS;
830		/* FALLTHROUGH */
831	case MODEKEYEDIT_CURSORRIGHT:
832		if (c->prompt_index < size) {
833			c->prompt_index++;
834			c->flags |= CLIENT_STATUS;
835		}
836		break;
837	case MODEKEYEDIT_SWITCHMODEBEGINLINE:
838		c->flags |= CLIENT_STATUS;
839		/* FALLTHROUGH */
840	case MODEKEYEDIT_STARTOFLINE:
841		if (c->prompt_index != 0) {
842			c->prompt_index = 0;
843			c->flags |= CLIENT_STATUS;
844		}
845		break;
846	case MODEKEYEDIT_SWITCHMODEAPPENDLINE:
847		c->flags |= CLIENT_STATUS;
848		/* FALLTHROUGH */
849	case MODEKEYEDIT_ENDOFLINE:
850		if (c->prompt_index != size) {
851			c->prompt_index = size;
852			c->flags |= CLIENT_STATUS;
853		}
854		break;
855	case MODEKEYEDIT_COMPLETE:
856		if (*c->prompt_buffer == '\0')
857			break;
858
859		idx = c->prompt_index;
860		if (idx != 0)
861			idx--;
862
863		/* Find the word we are in. */
864		first = c->prompt_buffer + idx;
865		while (first > c->prompt_buffer && *first != ' ')
866			first--;
867		while (*first == ' ')
868			first++;
869		last = c->prompt_buffer + idx;
870		while (*last != '\0' && *last != ' ')
871			last++;
872		while (*last == ' ')
873			last--;
874		if (*last != '\0')
875			last++;
876		if (last <= first ||
877		    ((size_t) (last - first)) > (sizeof word) - 1)
878			break;
879		memcpy(word, first, last - first);
880		word[last - first] = '\0';
881
882		/* And try to complete it. */
883		if ((s = status_prompt_complete(sess, word)) == NULL)
884			break;
885
886		/* Trim out word. */
887		n = size - (last - c->prompt_buffer) + 1; /* with \0 */
888		memmove(first, last, n);
889		size -= last - first;
890
891		/* Insert the new word. */
892		size += strlen(s);
893		off = first - c->prompt_buffer;
894		c->prompt_buffer = xrealloc(c->prompt_buffer, size + 1);
895		first = c->prompt_buffer + off;
896		memmove(first + strlen(s), first, n);
897		memcpy(first, s, strlen(s));
898
899		c->prompt_index = (first - c->prompt_buffer) + strlen(s);
900		free(s);
901
902		c->flags |= CLIENT_STATUS;
903		break;
904	case MODEKEYEDIT_BACKSPACE:
905		if (c->prompt_index != 0) {
906			if (c->prompt_index == size)
907				c->prompt_buffer[--c->prompt_index] = '\0';
908			else {
909				memmove(c->prompt_buffer + c->prompt_index - 1,
910				    c->prompt_buffer + c->prompt_index,
911				    size + 1 - c->prompt_index);
912				c->prompt_index--;
913			}
914			c->flags |= CLIENT_STATUS;
915		}
916		break;
917	case MODEKEYEDIT_DELETE:
918	case MODEKEYEDIT_SWITCHMODESUBSTITUTE:
919		if (c->prompt_index != size) {
920			memmove(c->prompt_buffer + c->prompt_index,
921			    c->prompt_buffer + c->prompt_index + 1,
922			    size + 1 - c->prompt_index);
923			c->flags |= CLIENT_STATUS;
924		}
925		break;
926	case MODEKEYEDIT_DELETELINE:
927	case MODEKEYEDIT_SWITCHMODESUBSTITUTELINE:
928		*c->prompt_buffer = '\0';
929		c->prompt_index = 0;
930		c->flags |= CLIENT_STATUS;
931		break;
932	case MODEKEYEDIT_DELETETOENDOFLINE:
933	case MODEKEYEDIT_SWITCHMODECHANGELINE:
934		if (c->prompt_index < size) {
935			c->prompt_buffer[c->prompt_index] = '\0';
936			c->flags |= CLIENT_STATUS;
937		}
938		break;
939	case MODEKEYEDIT_DELETEWORD:
940		wsep = options_get_string(oo, "word-separators");
941		idx = c->prompt_index;
942
943		/* Find a non-separator. */
944		while (idx != 0) {
945			idx--;
946			if (!strchr(wsep, c->prompt_buffer[idx]))
947				break;
948		}
949
950		/* Find the separator at the beginning of the word. */
951		while (idx != 0) {
952			idx--;
953			if (strchr(wsep, c->prompt_buffer[idx])) {
954				/* Go back to the word. */
955				idx++;
956				break;
957			}
958		}
959
960		memmove(c->prompt_buffer + idx,
961		    c->prompt_buffer + c->prompt_index,
962		    size + 1 - c->prompt_index);
963		memset(c->prompt_buffer + size - (c->prompt_index - idx),
964		    '\0', c->prompt_index - idx);
965		c->prompt_index = idx;
966		c->flags |= CLIENT_STATUS;
967		break;
968	case MODEKEYEDIT_NEXTSPACE:
969		wsep = " ";
970		/* FALLTHROUGH */
971	case MODEKEYEDIT_NEXTWORD:
972		if (wsep == NULL)
973			wsep = options_get_string(oo, "word-separators");
974
975		/* Find a separator. */
976		while (c->prompt_index != size) {
977			c->prompt_index++;
978			if (strchr(wsep, c->prompt_buffer[c->prompt_index]))
979				break;
980		}
981
982		/* Find the word right after the separation. */
983		while (c->prompt_index != size) {
984			c->prompt_index++;
985			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
986				break;
987		}
988
989		c->flags |= CLIENT_STATUS;
990		break;
991	case MODEKEYEDIT_NEXTSPACEEND:
992		wsep = " ";
993		/* FALLTHROUGH */
994	case MODEKEYEDIT_NEXTWORDEND:
995		if (wsep == NULL)
996			wsep = options_get_string(oo, "word-separators");
997
998		/* Find a word. */
999		while (c->prompt_index != size) {
1000			c->prompt_index++;
1001			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1002				break;
1003		}
1004
1005		/* Find the separator at the end of the word. */
1006		while (c->prompt_index != size) {
1007			c->prompt_index++;
1008			if (strchr(wsep, c->prompt_buffer[c->prompt_index]))
1009				break;
1010		}
1011
1012		/* Back up to the end-of-word like vi. */
1013		if (options_get_number(oo, "status-keys") == MODEKEY_VI &&
1014		    c->prompt_index != 0)
1015			c->prompt_index--;
1016
1017		c->flags |= CLIENT_STATUS;
1018		break;
1019	case MODEKEYEDIT_PREVIOUSSPACE:
1020		wsep = " ";
1021		/* FALLTHROUGH */
1022	case MODEKEYEDIT_PREVIOUSWORD:
1023		if (wsep == NULL)
1024			wsep = options_get_string(oo, "word-separators");
1025
1026		/* Find a non-separator. */
1027		while (c->prompt_index != 0) {
1028			c->prompt_index--;
1029			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1030				break;
1031		}
1032
1033		/* Find the separator at the beginning of the word. */
1034		while (c->prompt_index != 0) {
1035			c->prompt_index--;
1036			if (strchr(wsep, c->prompt_buffer[c->prompt_index])) {
1037				/* Go back to the word. */
1038				c->prompt_index++;
1039				break;
1040			}
1041		}
1042
1043		c->flags |= CLIENT_STATUS;
1044		break;
1045	case MODEKEYEDIT_HISTORYUP:
1046		histstr = status_prompt_up_history(&c->prompt_hindex);
1047		if (histstr == NULL)
1048			break;
1049		free(c->prompt_buffer);
1050		c->prompt_buffer = xstrdup(histstr);
1051		c->prompt_index = strlen(c->prompt_buffer);
1052		c->flags |= CLIENT_STATUS;
1053		break;
1054	case MODEKEYEDIT_HISTORYDOWN:
1055		histstr = status_prompt_down_history(&c->prompt_hindex);
1056		if (histstr == NULL)
1057			break;
1058		free(c->prompt_buffer);
1059		c->prompt_buffer = xstrdup(histstr);
1060		c->prompt_index = strlen(c->prompt_buffer);
1061		c->flags |= CLIENT_STATUS;
1062		break;
1063	case MODEKEYEDIT_PASTE:
1064		if ((pb = paste_get_top(NULL)) == NULL)
1065			break;
1066		bufdata = paste_buffer_data(pb, &bufsize);
1067		for (n = 0; n < bufsize; n++) {
1068			ch = (u_char)bufdata[n];
1069			if (ch < 32 || ch == 127)
1070				break;
1071		}
1072
1073		c->prompt_buffer = xrealloc(c->prompt_buffer, size + n + 1);
1074		if (c->prompt_index == size) {
1075			memcpy(c->prompt_buffer + c->prompt_index, bufdata, n);
1076			c->prompt_index += n;
1077			c->prompt_buffer[c->prompt_index] = '\0';
1078		} else {
1079			memmove(c->prompt_buffer + c->prompt_index + n,
1080			    c->prompt_buffer + c->prompt_index,
1081			    size + 1 - c->prompt_index);
1082			memcpy(c->prompt_buffer + c->prompt_index, bufdata, n);
1083			c->prompt_index += n;
1084		}
1085
1086		c->flags |= CLIENT_STATUS;
1087		break;
1088	case MODEKEYEDIT_TRANSPOSECHARS:
1089		idx = c->prompt_index;
1090		if (idx < size)
1091			idx++;
1092		if (idx >= 2) {
1093			swapc = c->prompt_buffer[idx - 2];
1094			c->prompt_buffer[idx - 2] = c->prompt_buffer[idx - 1];
1095			c->prompt_buffer[idx - 1] = swapc;
1096			c->prompt_index = idx;
1097			c->flags |= CLIENT_STATUS;
1098		}
1099		break;
1100	case MODEKEYEDIT_ENTER:
1101		if (*c->prompt_buffer != '\0')
1102			status_prompt_add_history(c->prompt_buffer);
1103		if (c->prompt_callbackfn(c->prompt_data, c->prompt_buffer) == 0)
1104			status_prompt_clear(c);
1105		break;
1106	case MODEKEYEDIT_CANCEL:
1107		if (c->prompt_callbackfn(c->prompt_data, NULL) == 0)
1108			status_prompt_clear(c);
1109		break;
1110	case MODEKEY_OTHER:
1111		if (key <= 0x1f || key >= 0x7f)
1112			break;
1113		c->prompt_buffer = xrealloc(c->prompt_buffer, size + 2);
1114
1115		if (c->prompt_index == size) {
1116			c->prompt_buffer[c->prompt_index++] = key;
1117			c->prompt_buffer[c->prompt_index] = '\0';
1118		} else {
1119			memmove(c->prompt_buffer + c->prompt_index + 1,
1120			    c->prompt_buffer + c->prompt_index,
1121			    size + 1 - c->prompt_index);
1122			c->prompt_buffer[c->prompt_index++] = key;
1123		}
1124
1125		if (c->prompt_flags & PROMPT_SINGLE) {
1126			if (c->prompt_callbackfn(c->prompt_data,
1127			    c->prompt_buffer) == 0)
1128				status_prompt_clear(c);
1129		}
1130
1131		c->flags |= CLIENT_STATUS;
1132		break;
1133	default:
1134		break;
1135	}
1136}
1137
1138/* Get previous line from the history. */
1139const char *
1140status_prompt_up_history(u_int *idx)
1141{
1142	/*
1143	 * History runs from 0 to size - 1. Index is from 0 to size. Zero is
1144	 * empty.
1145	 */
1146
1147	if (status_prompt_hsize == 0 || *idx == status_prompt_hsize)
1148		return (NULL);
1149	(*idx)++;
1150	return (status_prompt_hlist[status_prompt_hsize - *idx]);
1151}
1152
1153/* Get next line from the history. */
1154const char *
1155status_prompt_down_history(u_int *idx)
1156{
1157	if (status_prompt_hsize == 0 || *idx == 0)
1158		return ("");
1159	(*idx)--;
1160	if (*idx == 0)
1161		return ("");
1162	return (status_prompt_hlist[status_prompt_hsize - *idx]);
1163}
1164
1165/* Add line to the history. */
1166void
1167status_prompt_add_history(const char *line)
1168{
1169	size_t	size;
1170
1171	if (status_prompt_hsize > 0 &&
1172	    strcmp(status_prompt_hlist[status_prompt_hsize - 1], line) == 0)
1173		return;
1174
1175	if (status_prompt_hsize == PROMPT_HISTORY) {
1176		free(status_prompt_hlist[0]);
1177
1178		size = (PROMPT_HISTORY - 1) * sizeof *status_prompt_hlist;
1179		memmove(&status_prompt_hlist[0], &status_prompt_hlist[1], size);
1180
1181		status_prompt_hlist[status_prompt_hsize - 1] = xstrdup(line);
1182		return;
1183	}
1184
1185	status_prompt_hlist = xreallocarray(status_prompt_hlist,
1186	    status_prompt_hsize + 1, sizeof *status_prompt_hlist);
1187	status_prompt_hlist[status_prompt_hsize++] = xstrdup(line);
1188}
1189
1190/* Build completion list. */
1191const char **
1192status_prompt_complete_list(u_int *size, const char *s)
1193{
1194	const char				**list = NULL, **layout;
1195	const struct cmd_entry			**cmdent;
1196	const struct options_table_entry	 *oe;
1197	const char				 *layouts[] = {
1198		"even-horizontal", "even-vertical", "main-horizontal",
1199		"main-vertical", "tiled", NULL
1200	};
1201
1202	*size = 0;
1203	for (cmdent = cmd_table; *cmdent != NULL; cmdent++) {
1204		if (strncmp((*cmdent)->name, s, strlen(s)) == 0) {
1205			list = xreallocarray(list, (*size) + 1, sizeof *list);
1206			list[(*size)++] = (*cmdent)->name;
1207		}
1208	}
1209	for (oe = options_table; oe->name != NULL; oe++) {
1210		if (strncmp(oe->name, s, strlen(s)) == 0) {
1211			list = xreallocarray(list, (*size) + 1, sizeof *list);
1212			list[(*size)++] = oe->name;
1213		}
1214	}
1215	for (layout = layouts; *layout != NULL; layout++) {
1216		if (strncmp(*layout, s, strlen(s)) == 0) {
1217			list = xreallocarray(list, (*size) + 1, sizeof *list);
1218			list[(*size)++] = *layout;
1219		}
1220	}
1221	return (list);
1222}
1223
1224/* Find longest prefix. */
1225char *
1226status_prompt_complete_prefix(const char **list, u_int size)
1227{
1228	char	 *out;
1229	u_int	  i;
1230	size_t	  j;
1231
1232	out = xstrdup(list[0]);
1233	for (i = 1; i < size; i++) {
1234		j = strlen(list[i]);
1235		if (j > strlen(out))
1236			j = strlen(out);
1237		for (; j > 0; j--) {
1238			if (out[j - 1] != list[i][j - 1])
1239				out[j - 1] = '\0';
1240		}
1241	}
1242	return (out);
1243}
1244
1245/* Complete word. */
1246char *
1247status_prompt_complete(struct session *sess, const char *s)
1248{
1249	const char	**list = NULL, *colon;
1250	u_int		  size = 0, i;
1251	struct session	 *s_loop;
1252	struct winlink	 *wl;
1253	struct window	 *w;
1254	char		 *copy, *out, *tmp;
1255
1256	if (*s == '\0')
1257		return (NULL);
1258	out = NULL;
1259
1260	if (strncmp(s, "-t", 2) != 0 && strncmp(s, "-s", 2) != 0) {
1261		list = status_prompt_complete_list(&size, s);
1262		if (size == 0)
1263			out = NULL;
1264		else if (size == 1)
1265			xasprintf(&out, "%s ", list[0]);
1266		else
1267			out = status_prompt_complete_prefix(list, size);
1268		free(list);
1269		return (out);
1270	}
1271	copy = xstrdup(s);
1272
1273	colon = ":";
1274	if (copy[strlen(copy) - 1] == ':')
1275		copy[strlen(copy) - 1] = '\0';
1276	else
1277		colon = "";
1278	s = copy + 2;
1279
1280	RB_FOREACH(s_loop, sessions, &sessions) {
1281		if (strncmp(s_loop->name, s, strlen(s)) == 0) {
1282			list = xreallocarray(list, size + 2, sizeof *list);
1283			list[size++] = s_loop->name;
1284		}
1285	}
1286	if (size == 1) {
1287		out = xstrdup(list[0]);
1288		if (session_find(list[0]) != NULL)
1289			colon = ":";
1290	} else if (size != 0)
1291		out = status_prompt_complete_prefix(list, size);
1292	if (out != NULL) {
1293		xasprintf(&tmp, "-%c%s%s", copy[1], out, colon);
1294		out = tmp;
1295		goto found;
1296	}
1297
1298	colon = "";
1299	if (*s == ':') {
1300		RB_FOREACH(wl, winlinks, &sess->windows) {
1301			xasprintf(&tmp, ":%s", wl->window->name);
1302			if (strncmp(tmp, s, strlen(s)) == 0){
1303				list = xreallocarray(list, size + 1,
1304				    sizeof *list);
1305				list[size++] = tmp;
1306				continue;
1307			}
1308			free(tmp);
1309
1310			xasprintf(&tmp, ":%d", wl->idx);
1311			if (strncmp(tmp, s, strlen(s)) == 0) {
1312				list = xreallocarray(list, size + 1,
1313				    sizeof *list);
1314				list[size++] = tmp;
1315				continue;
1316			}
1317			free(tmp);
1318		}
1319	} else {
1320		RB_FOREACH(s_loop, sessions, &sessions) {
1321			RB_FOREACH(wl, winlinks, &s_loop->windows) {
1322				w = wl->window;
1323
1324				xasprintf(&tmp, "%s:%s", s_loop->name, w->name);
1325				if (strncmp(tmp, s, strlen(s)) == 0) {
1326					list = xreallocarray(list, size + 1,
1327					    sizeof *list);
1328					list[size++] = tmp;
1329					continue;
1330				}
1331				free(tmp);
1332
1333				xasprintf(&tmp, "%s:%d", s_loop->name, wl->idx);
1334				if (strncmp(tmp, s, strlen(s)) == 0) {
1335					list = xreallocarray(list, size + 1,
1336					    sizeof *list);
1337					list[size++] = tmp;
1338					continue;
1339				}
1340				free(tmp);
1341			}
1342		}
1343	}
1344	if (size == 1) {
1345		out = xstrdup(list[0]);
1346		colon = " ";
1347	} else if (size != 0)
1348		out = status_prompt_complete_prefix(list, size);
1349	if (out != NULL) {
1350		xasprintf(&tmp, "-%c%s%s", copy[1], out, colon);
1351		out = tmp;
1352	}
1353
1354	for (i = 0; i < size; i++)
1355		free((void *)list[i]);
1356
1357found:
1358	free(copy);
1359	free(list);
1360	return (out);
1361}
1362