status.c revision 1.52 
1/* $OpenBSD: status.c,v 1.52 2009/11/26 21:37:13 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_job(struct client *, char **);
37void	status_job_callback(struct job *);
38size_t	status_width(struct client *, struct winlink *, time_t);
39char   *status_print(
40    	    struct client *, struct winlink *, time_t, struct grid_cell *);
41void	status_replace1(struct client *,
42    	    struct winlink *, char **, char **, char *, size_t, int);
43void	status_message_callback(int, short, void *);
44
45void	status_prompt_add_history(struct client *);
46char   *status_prompt_complete(const char *);
47
48/* Retrieve options for left string. */
49char *
50status_redraw_get_left(struct client *c,
51    time_t t, int utf8flag, struct grid_cell *gc, size_t *size)
52{
53	struct session	*s = c->session;
54	char		*left;
55	u_char		 fg, bg, attr;
56	size_t		 leftlen;
57
58	fg = options_get_number(&s->options, "status-left-fg");
59	if (fg != 8)
60		colour_set_fg(gc, fg);
61	bg = options_get_number(&s->options, "status-left-bg");
62	if (bg != 8)
63		colour_set_bg(gc, bg);
64	attr = options_get_number(&s->options, "status-left-attr");
65	if (attr != 0)
66		gc->attr = attr;
67
68	left = status_replace(
69	    c, NULL, options_get_string(&s->options, "status-left"), t, 1);
70
71	*size = options_get_number(&s->options, "status-left-length");
72	leftlen = screen_write_cstrlen(utf8flag, "%s", left);
73	if (leftlen < *size)
74		*size = leftlen;
75	return (left);
76}
77
78/* Retrieve options for right string. */
79char *
80status_redraw_get_right(struct client *c,
81    time_t t, int utf8flag, struct grid_cell *gc, size_t *size)
82{
83	struct session	*s = c->session;
84	char		*right;
85	u_char		 fg, bg, attr;
86	size_t		 rightlen;
87
88	fg = options_get_number(&s->options, "status-right-fg");
89	if (fg != 8)
90		colour_set_fg(gc, fg);
91	bg = options_get_number(&s->options, "status-right-bg");
92	if (bg != 8)
93		colour_set_bg(gc, bg);
94	attr = options_get_number(&s->options, "status-right-attr");
95	if (attr != 0)
96		gc->attr = attr;
97
98	right = status_replace(
99	    c, NULL, options_get_string(&s->options, "status-right"), t, 1);
100
101	*size = options_get_number(&s->options, "status-right-length");
102	rightlen = screen_write_cstrlen(utf8flag, "%s", right);
103	if (rightlen < *size)
104		*size = rightlen;
105	return (right);
106}
107
108/* Draw status for client on the last lines of given context. */
109int
110status_redraw(struct client *c)
111{
112	struct screen_write_ctx	ctx;
113	struct session	       *s = c->session;
114	struct winlink	       *wl;
115	struct screen		old_status, window_list;
116	struct grid_cell	stdgc, lgc, rgc, gc;
117	time_t			t;
118	char		       *left, *right;
119	u_int			offset, needed;
120	u_int			wlstart, wlwidth, wlavailable, wloffset, wlsize;
121	size_t			llen, rlen;
122	int			larrow, rarrow, utf8flag;
123
124	/* No status line? */
125	if (c->tty.sy == 0 || !options_get_number(&s->options, "status"))
126		return (1);
127	left = right = NULL;
128	larrow = rarrow = 0;
129
130	/* Update status timer. */
131	if (gettimeofday(&c->status_timer, NULL) != 0)
132		fatal("gettimeofday failed");
133	t = c->status_timer.tv_sec;
134
135	/* Set up default colour. */
136	memcpy(&stdgc, &grid_default_cell, sizeof gc);
137	colour_set_fg(&stdgc, options_get_number(&s->options, "status-fg"));
138	colour_set_bg(&stdgc, options_get_number(&s->options, "status-bg"));
139	stdgc.attr |= options_get_number(&s->options, "status-attr");
140
141	/* Create the target screen. */
142	memcpy(&old_status, &c->status, sizeof old_status);
143	screen_init(&c->status, c->tty.sx, 1, 0);
144	screen_write_start(&ctx, NULL, &c->status);
145	for (offset = 0; offset < c->tty.sx; offset++)
146		screen_write_putc(&ctx, &stdgc, ' ');
147	screen_write_stop(&ctx);
148
149	/* If the height is one line, blank status line. */
150	if (c->tty.sy <= 1)
151		goto out;
152
153	/* Get UTF-8 flag. */
154	utf8flag = options_get_number(&s->options, "status-utf8");
155
156	/* Work out left and right strings. */
157	memcpy(&lgc, &stdgc, sizeof lgc);
158	left = status_redraw_get_left(c, t, utf8flag, &lgc, &llen);
159	memcpy(&rgc, &stdgc, sizeof rgc);
160	right = status_redraw_get_right(c, t, utf8flag, &rgc, &rlen);
161
162	/*
163	 * Figure out how much space we have for the window list. If there
164	 * isn't enough space, just show a blank status line.
165	 */
166        needed = 0;
167	if (llen != 0)
168		needed += llen + 1;
169	if (rlen != 0)
170		needed += rlen + 1;
171	if (c->tty.sx == 0 || c->tty.sx <= needed)
172		goto out;
173	wlavailable = c->tty.sx - needed;
174
175	/* Calculate the total size needed for the window list. */
176	wlstart = wloffset = wlwidth = 0;
177	RB_FOREACH(wl, winlinks, &s->windows) {
178		if (wl->status_text != NULL)
179			xfree(wl->status_text);
180		memcpy(&wl->status_cell, &stdgc, sizeof wl->status_cell);
181		wl->status_text = status_print(c, wl, t, &wl->status_cell);
182		wl->status_width =
183		    screen_write_cstrlen(utf8flag, "%s", wl->status_text);
184
185		if (wl == s->curw)
186			wloffset = wlwidth;
187		wlwidth += wl->status_width + 1;
188	}
189
190	/* Create a new screen for the window list. */
191	screen_init(&window_list, wlwidth, 1, 0);
192
193	/* And draw the window list into it. */
194	screen_write_start(&ctx, NULL, &window_list);
195	RB_FOREACH(wl, winlinks, &s->windows) {
196 		screen_write_cnputs(&ctx,
197		    -1, &wl->status_cell, utf8flag, "%s", wl->status_text);
198		screen_write_putc(&ctx, &stdgc, ' ');
199	}
200	screen_write_stop(&ctx);
201
202	/* If there is enough space for the total width, skip to draw now. */
203	if (wlwidth <= wlavailable)
204		goto draw;
205
206	/* Find size of current window text. */
207	wlsize = s->curw->status_width;
208
209	/*
210	 * If the current window is already on screen, good to draw from the
211	 * start and just leave off the end.
212	 */
213	if (wloffset + wlsize < wlavailable) {
214		if (wlavailable > 0) {
215			rarrow = 1;
216			wlavailable--;
217		}
218		wlwidth = wlavailable;
219	} else {
220		/*
221		 * Work out how many characters we need to omit from the
222		 * start. There are wlavailable characters to fill, and
223		 * wloffset + wlsize must be the last. So, the start character
224		 * is wloffset + wlsize - wlavailable.
225		 */
226		if (wlavailable > 0) {
227			larrow = 1;
228			wlavailable--;
229		}
230
231		wlstart = wloffset + wlsize - wlavailable;
232		if (wlavailable > 0 && wlwidth > wlstart + wlavailable + 1) {
233			rarrow = 1;
234			wlstart++;
235			wlavailable--;
236		}
237		wlwidth = wlavailable;
238	}
239
240	/* Bail if anything is now too small too. */
241	if (wlwidth == 0 || wlavailable == 0) {
242		screen_free(&window_list);
243		goto out;
244	}
245
246	/*
247	 * Now the start position is known, work out the state of the left and
248	 * right arrows.
249	 */
250	offset = 0;
251	RB_FOREACH(wl, winlinks, &s->windows) {
252		if (larrow == 1 && offset < wlstart) {
253			if (session_alert_has(s, wl, WINDOW_ACTIVITY))
254				larrow = -1;
255			else if (session_alert_has(s, wl, WINDOW_BELL))
256				larrow = -1;
257			else if (session_alert_has(s, wl, WINDOW_CONTENT))
258				larrow = -1;
259		}
260
261		offset += wl->status_width;
262
263		if (rarrow == 1 && offset > wlstart + wlwidth) {
264			if (session_alert_has(s, wl, WINDOW_ACTIVITY))
265				rarrow = -1;
266			else if (session_alert_has(s, wl, WINDOW_BELL))
267				rarrow = -1;
268			else if (session_alert_has(s, wl, WINDOW_CONTENT))
269				rarrow = -1;
270		}
271	}
272
273draw:
274 	/* Begin drawing. */
275	screen_write_start(&ctx, NULL, &c->status);
276
277	/* Draw the left string and arrow. */
278	screen_write_cursormove(&ctx, 0, 0);
279	if (llen != 0) {
280		screen_write_cnputs(&ctx, llen, &lgc, utf8flag, "%s", left);
281		screen_write_putc(&ctx, &stdgc, ' ');
282	}
283	if (larrow != 0) {
284		memcpy(&gc, &stdgc, sizeof gc);
285		if (larrow == -1)
286			gc.attr ^= GRID_ATTR_REVERSE;
287		screen_write_putc(&ctx, &gc, '<');
288	}
289
290	/* Draw the right string and arrow. */
291	if (rarrow != 0) {
292		screen_write_cursormove(&ctx, c->tty.sx - rlen - 2, 0);
293		memcpy(&gc, &stdgc, sizeof gc);
294		if (rarrow == -1)
295			gc.attr ^= GRID_ATTR_REVERSE;
296		screen_write_putc(&ctx, &gc, '>');
297	} else
298		screen_write_cursormove(&ctx, c->tty.sx - rlen - 1, 0);
299	if (rlen != 0) {
300		screen_write_putc(&ctx, &stdgc, ' ');
301		screen_write_cnputs(&ctx, rlen, &rgc, utf8flag, "%s", right);
302	}
303
304	/* Figure out the offset for the window list. */
305	wloffset = 1;
306	if (wlwidth < wlavailable) {
307		switch (options_get_number(&s->options, "status-justify")) {
308		case 1:	/* centered */
309			wloffset = 1 + (wlavailable - wlwidth) / 2;
310			break;
311		case 2:	/* right */
312			wloffset = 1 + (wlavailable - wlwidth);
313			break;
314		}
315	}
316	wloffset += llen;
317	if (larrow != 0)
318		wloffset++;
319
320	/* Copy the window list. */
321	screen_write_cursormove(&ctx, wloffset, 0);
322	screen_write_copy(&ctx, &window_list, wlstart, 0, wlwidth, 1);
323 	screen_free(&window_list);
324
325	screen_write_stop(&ctx);
326
327out:
328	if (left != NULL)
329		xfree(left);
330	if (right != NULL)
331		xfree(right);
332
333	if (grid_compare(c->status.grid, old_status.grid) == 0) {
334		screen_free(&old_status);
335		return (0);
336	}
337	screen_free(&old_status);
338	return (1);
339}
340
341/* Replace a single special sequence (prefixed by #). */
342void
343status_replace1(struct client *c,struct winlink *wl,
344    char **iptr, char **optr, char *out, size_t outsize, int jobsflag)
345{
346	struct session *s = c->session;
347	char		ch, tmp[256], *ptr, *endptr, *freeptr;
348	size_t		ptrlen;
349	long		limit;
350
351	if (wl == NULL)
352		wl = s->curw;
353
354	errno = 0;
355	limit = strtol(*iptr, &endptr, 10);
356	if ((limit == 0 && errno != EINVAL) ||
357	    (limit == LONG_MIN && errno != ERANGE) ||
358	    (limit == LONG_MAX && errno != ERANGE) ||
359	    limit != 0)
360		*iptr = endptr;
361	if (limit <= 0)
362		limit = LONG_MAX;
363
364	freeptr = NULL;
365
366	switch (*(*iptr)++) {
367	case '(':
368		if (!jobsflag) {
369			ch = ')';
370			goto skip_to;
371		}
372		if ((ptr = status_job(c, iptr)) == NULL)
373			return;
374		freeptr = ptr;
375		goto do_replace;
376	case 'H':
377		if (gethostname(tmp, sizeof tmp) != 0)
378			fatal("gethostname failed");
379		ptr = tmp;
380		goto do_replace;
381	case 'I':
382		xsnprintf(tmp, sizeof tmp, "%d", wl->idx);
383		ptr = tmp;
384		goto do_replace;
385	case 'P':
386		xsnprintf(tmp, sizeof tmp, "%u",
387		    window_pane_index(wl->window, wl->window->active));
388		ptr = tmp;
389		goto do_replace;
390	case 'S':
391		ptr = s->name;
392		goto do_replace;
393	case 'T':
394		ptr = wl->window->active->base.title;
395		goto do_replace;
396	case 'W':
397		ptr = wl->window->name;
398		goto do_replace;
399	case 'F':
400		tmp[0] = ' ';
401		if (session_alert_has(s, wl, WINDOW_CONTENT))
402			tmp[0] = '+';
403		else if (session_alert_has(s, wl, WINDOW_BELL))
404			tmp[0] = '!';
405		else if (session_alert_has(s, wl, WINDOW_ACTIVITY))
406			tmp[0] = '#';
407		else if (wl == s->curw)
408			tmp[0] = '*';
409		else if (wl == TAILQ_FIRST(&s->lastw))
410			tmp[0] = '-';
411		tmp[1] = '\0';
412		ptr = tmp;
413		goto do_replace;
414	case '[':
415		/*
416		 * Embedded style, handled at display time. Leave present and
417		 * skip input until ].
418		 */
419		ch = ']';
420		goto skip_to;
421	case '#':
422		*(*optr)++ = '#';
423		break;
424	}
425
426	return;
427
428do_replace:
429	ptrlen = strlen(ptr);
430	if ((size_t) limit < ptrlen)
431		ptrlen = limit;
432
433	if (*optr + ptrlen >= out + outsize - 1)
434		return;
435	while (ptrlen > 0 && *ptr != '\0') {
436		*(*optr)++ = *ptr++;
437		ptrlen--;
438	}
439
440	if (freeptr != NULL)
441		xfree(freeptr);
442	return;
443
444skip_to:
445	*(*optr)++ = '#';
446
447	(*iptr)--;	/* include ch */
448	while (**iptr != ch && **iptr != '\0') {
449		if (*optr >=  out + outsize - 1)
450			break;
451		*(*optr)++ = *(*iptr)++;
452	}
453}
454
455/* Replace special sequences in fmt. */
456char *
457status_replace(struct client *c,
458    struct winlink *wl, const char *fmt, time_t t, int jobsflag)
459{
460	static char	out[BUFSIZ];
461	char		in[BUFSIZ], ch, *iptr, *optr;
462
463	strftime(in, sizeof in, fmt, localtime(&t));
464	in[(sizeof in) - 1] = '\0';
465
466	iptr = in;
467	optr = out;
468
469	while (*iptr != '\0') {
470		if (optr >= out + (sizeof out) - 1)
471			break;
472		ch = *iptr++;
473
474		if (ch != '#') {
475			*optr++ = ch;
476			continue;
477		}
478		status_replace1(c, wl, &iptr, &optr, out, sizeof out, jobsflag);
479	}
480	*optr = '\0';
481
482	return (xstrdup(out));
483}
484
485/* Figure out job name and get its result, starting it off if necessary. */
486char *
487status_job(struct client *c, char **iptr)
488{
489	struct job	*job;
490	char   		*cmd;
491	int		 lastesc;
492	size_t		 len;
493
494	if (**iptr == '\0')
495		return (NULL);
496	if (**iptr == ')') {		/* no command given */
497		(*iptr)++;
498		return (NULL);
499	}
500
501	cmd = xmalloc(strlen(*iptr) + 1);
502	len = 0;
503
504	lastesc = 0;
505	for (; **iptr != '\0'; (*iptr)++) {
506		if (!lastesc && **iptr == ')')
507			break;		/* unescaped ) is the end */
508		if (!lastesc && **iptr == '\\') {
509			lastesc = 1;
510			continue;	/* skip \ if not escaped */
511		}
512		lastesc = 0;
513		cmd[len++] = **iptr;
514	}
515	if (**iptr == '\0')		/* no terminating ) */ {
516		xfree(cmd);
517		return (NULL);
518	}
519	(*iptr)++;			/* skip final ) */
520	cmd[len] = '\0';
521
522	job = job_get(&c->status_jobs, cmd);
523	if (job == NULL) {
524		job = job_add(&c->status_jobs,
525		    JOB_PERSIST, c, cmd, status_job_callback, xfree, NULL);
526		job_run(job);
527	}
528	if (job->data == NULL)
529		return (xstrdup(""));
530	return (xstrdup(job->data));
531}
532
533/* Job has finished: save its result. */
534void
535status_job_callback(struct job *job)
536{
537	char	*line, *buf;
538	size_t	 len;
539
540	buf = NULL;
541	if ((line = evbuffer_readline(job->event->input)) == NULL) {
542		len = EVBUFFER_LENGTH(job->event->input);
543		buf = xmalloc(len + 1);
544		if (len != 0)
545			memcpy(buf, EVBUFFER_DATA(job->event->input), len);
546		buf[len] = '\0';
547	}
548
549	if (job->data != NULL)
550		xfree(job->data);
551	else
552		server_redraw_client(job->client);
553	job->data = xstrdup(line);
554
555	if (buf != NULL)
556		xfree(buf);
557}
558
559/* Calculate winlink status line entry width. */
560size_t
561status_width(struct client *c, struct winlink *wl, time_t t)
562{
563	struct options	*oo = &wl->window->options;
564	struct session	*s = c->session;
565	const char	*fmt;
566	char		*text;
567	size_t		 size;
568	int		 utf8flag;
569
570	utf8flag = options_get_number(&s->options, "status-utf8");
571
572	fmt = options_get_string(&wl->window->options, "window-status-format");
573	if (wl == s->curw)
574		fmt = options_get_string(oo, "window-status-current-format");
575
576	text = status_replace(c, wl, fmt, t, 1);
577	size = screen_write_cstrlen(utf8flag, "%s", text);
578	xfree(text);
579
580	return (size);
581}
582
583/* Return winlink status line entry and adjust gc as necessary. */
584char *
585status_print(
586    struct client *c, struct winlink *wl, time_t t, struct grid_cell *gc)
587{
588	struct options	*oo = &wl->window->options;
589	struct session	*s = c->session;
590	const char	*fmt;
591	char   		*text;
592	u_char		 fg, bg, attr;
593
594	fg = options_get_number(oo, "window-status-fg");
595	if (fg != 8)
596		colour_set_fg(gc, fg);
597	bg = options_get_number(oo, "window-status-bg");
598	if (bg != 8)
599		colour_set_bg(gc, bg);
600	attr = options_get_number(oo, "window-status-attr");
601	if (attr != 0)
602		gc->attr = attr;
603	fmt = options_get_string(oo, "window-status-format");
604	if (wl == s->curw) {
605		fg = options_get_number(oo, "window-status-current-fg");
606		if (fg != 8)
607			colour_set_fg(gc, fg);
608		bg = options_get_number(oo, "window-status-current-bg");
609		if (bg != 8)
610			colour_set_bg(gc, bg);
611		attr = options_get_number(oo, "window-status-current-attr");
612		if (attr != 0)
613			gc->attr = attr;
614		fmt = options_get_string(oo, "window-status-current-format");
615	}
616
617	if (session_alert_has(s, wl, WINDOW_ACTIVITY) ||
618	    session_alert_has(s, wl, WINDOW_BELL) ||
619	    session_alert_has(s, wl, WINDOW_CONTENT))
620		gc->attr ^= GRID_ATTR_REVERSE;
621
622	text = status_replace(c, wl, fmt, t, 1);
623	return (text);
624}
625
626/* Set a status line message. */
627void printflike2
628status_message_set(struct client *c, const char *fmt, ...)
629{
630	struct timeval		 tv;
631	struct session		*s = c->session;
632	struct message_entry	*msg;
633	va_list			 ap;
634	int			 delay;
635	u_int			 i, limit;
636
637	status_prompt_clear(c);
638	status_message_clear(c);
639
640	va_start(ap, fmt);
641	xvasprintf(&c->message_string, fmt, ap);
642	va_end(ap);
643
644	ARRAY_EXPAND(&c->message_log, 1);
645	msg = &ARRAY_LAST(&c->message_log);
646	msg->msg_time = time(NULL);
647	msg->msg = xstrdup(c->message_string);
648
649	if (s == NULL)
650		limit = 0;
651	else
652		limit = options_get_number(&s->options, "message-limit");
653	if (ARRAY_LENGTH(&c->message_log) > limit) {
654		limit = ARRAY_LENGTH(&c->message_log) - limit;
655		for (i = 0; i < limit; i++) {
656			msg = &ARRAY_FIRST(&c->message_log);
657			xfree(msg->msg);
658			ARRAY_REMOVE(&c->message_log, 0);
659		}
660	}
661
662	delay = options_get_number(&c->session->options, "display-time");
663	tv.tv_sec = delay / 1000;
664	tv.tv_usec = (delay % 1000) * 1000L;
665
666	evtimer_del(&c->message_timer);
667	evtimer_set(&c->message_timer, status_message_callback, c);
668	evtimer_add(&c->message_timer, &tv);
669
670	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
671	c->flags |= CLIENT_STATUS;
672}
673
674/* Clear status line message. */
675void
676status_message_clear(struct client *c)
677{
678	if (c->message_string == NULL)
679		return;
680
681	xfree(c->message_string);
682	c->message_string = NULL;
683
684	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
685	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
686
687	screen_reinit(&c->status);
688}
689
690/* Clear status line message after timer expires. */
691/* ARGSUSED */
692void
693status_message_callback(unused int fd, unused short event, void *data)
694{
695	struct client	*c = data;
696
697	status_message_clear(c);
698}
699
700/* Draw client message on status line of present else on last line. */
701int
702status_message_redraw(struct client *c)
703{
704	struct screen_write_ctx		ctx;
705	struct session		       *s = c->session;
706	struct screen		        old_status;
707	size_t			        len;
708	struct grid_cell		gc;
709	int				utf8flag;
710
711	if (c->tty.sx == 0 || c->tty.sy == 0)
712		return (0);
713	memcpy(&old_status, &c->status, sizeof old_status);
714	screen_init(&c->status, c->tty.sx, 1, 0);
715
716	utf8flag = options_get_number(&s->options, "status-utf8");
717
718	len = screen_write_strlen(utf8flag, "%s", c->message_string);
719	if (len > c->tty.sx)
720		len = c->tty.sx;
721
722	memcpy(&gc, &grid_default_cell, sizeof gc);
723	colour_set_fg(&gc, options_get_number(&s->options, "message-fg"));
724	colour_set_bg(&gc, options_get_number(&s->options, "message-bg"));
725	gc.attr |= options_get_number(&s->options, "message-attr");
726
727	screen_write_start(&ctx, NULL, &c->status);
728
729	screen_write_cursormove(&ctx, 0, 0);
730	screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->message_string);
731	for (; len < c->tty.sx; len++)
732		screen_write_putc(&ctx, &gc, ' ');
733
734	screen_write_stop(&ctx);
735
736	if (grid_compare(c->status.grid, old_status.grid) == 0) {
737		screen_free(&old_status);
738		return (0);
739	}
740	screen_free(&old_status);
741	return (1);
742}
743
744/* Enable status line prompt. */
745void
746status_prompt_set(struct client *c, const char *msg,
747    int (*callbackfn)(void *, const char *), void (*freefn)(void *),
748    void *data, int flags)
749{
750	int	keys;
751
752	status_message_clear(c);
753	status_prompt_clear(c);
754
755	c->prompt_string = xstrdup(msg);
756
757	c->prompt_buffer = xstrdup("");
758	c->prompt_index = 0;
759
760	c->prompt_callbackfn = callbackfn;
761	c->prompt_freefn = freefn;
762	c->prompt_data = data;
763
764	c->prompt_hindex = 0;
765
766	c->prompt_flags = flags;
767
768	keys = options_get_number(&c->session->options, "status-keys");
769	if (keys == MODEKEY_EMACS)
770		mode_key_init(&c->prompt_mdata, &mode_key_tree_emacs_edit);
771	else
772		mode_key_init(&c->prompt_mdata, &mode_key_tree_vi_edit);
773
774	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
775	c->flags |= CLIENT_STATUS;
776}
777
778/* Remove status line prompt. */
779void
780status_prompt_clear(struct client *c)
781{
782 	if (c->prompt_string == NULL)
783		return;
784
785	if (c->prompt_freefn != NULL && c->prompt_data != NULL)
786		c->prompt_freefn(c->prompt_data);
787
788	xfree(c->prompt_string);
789	c->prompt_string = NULL;
790
791	xfree(c->prompt_buffer);
792	c->prompt_buffer = NULL;
793
794	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
795	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
796
797	screen_reinit(&c->status);
798}
799
800/* Update status line prompt with a new prompt string. */
801void
802status_prompt_update(struct client *c, const char *msg)
803{
804	xfree(c->prompt_string);
805	c->prompt_string = xstrdup(msg);
806
807	*c->prompt_buffer = '\0';
808	c->prompt_index = 0;
809
810	c->prompt_hindex = 0;
811
812	c->flags |= CLIENT_STATUS;
813}
814
815/* Draw client prompt on status line of present else on last line. */
816int
817status_prompt_redraw(struct client *c)
818{
819	struct screen_write_ctx		ctx;
820	struct session		       *s = c->session;
821	struct screen		        old_status;
822	size_t			        i, size, left, len, off;
823	struct grid_cell		gc, *gcp;
824	int				utf8flag;
825
826	if (c->tty.sx == 0 || c->tty.sy == 0)
827		return (0);
828	memcpy(&old_status, &c->status, sizeof old_status);
829	screen_init(&c->status, c->tty.sx, 1, 0);
830
831	utf8flag = options_get_number(&s->options, "status-utf8");
832
833	len = screen_write_strlen(utf8flag, "%s", c->prompt_string);
834	if (len > c->tty.sx)
835		len = c->tty.sx;
836	off = 0;
837
838	memcpy(&gc, &grid_default_cell, sizeof gc);
839	colour_set_fg(&gc, options_get_number(&s->options, "message-fg"));
840	colour_set_bg(&gc, options_get_number(&s->options, "message-bg"));
841	gc.attr |= options_get_number(&s->options, "message-attr");
842
843	screen_write_start(&ctx, NULL, &c->status);
844
845	screen_write_cursormove(&ctx, 0, 0);
846	screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->prompt_string);
847
848	left = c->tty.sx - len;
849	if (left != 0) {
850		size = screen_write_strlen(utf8flag, "%s", c->prompt_buffer);
851		if (c->prompt_index >= left) {
852			off = c->prompt_index - left + 1;
853			if (c->prompt_index == size)
854				left--;
855			size = left;
856		}
857		screen_write_nputs(
858		    &ctx, left, &gc, utf8flag, "%s", c->prompt_buffer + off);
859
860 		for (i = len + size; i < c->tty.sx; i++)
861 			screen_write_putc(&ctx, &gc, ' ');
862	}
863
864	screen_write_stop(&ctx);
865
866	/* Apply fake cursor. */
867	off = len + c->prompt_index - off;
868	gcp = grid_view_get_cell(c->status.grid, off, 0);
869	gcp->attr ^= GRID_ATTR_REVERSE;
870
871	if (grid_compare(c->status.grid, old_status.grid) == 0) {
872		screen_free(&old_status);
873		return (0);
874	}
875	screen_free(&old_status);
876	return (1);
877}
878
879/* Handle keys in prompt. */
880void
881status_prompt_key(struct client *c, int key)
882{
883	struct paste_buffer	*pb;
884	char   			*s, *first, *last, word[64], swapc;
885	size_t			 size, n, off, idx;
886
887	size = strlen(c->prompt_buffer);
888	switch (mode_key_lookup(&c->prompt_mdata, key)) {
889	case MODEKEYEDIT_CURSORLEFT:
890		if (c->prompt_index > 0) {
891			c->prompt_index--;
892			c->flags |= CLIENT_STATUS;
893		}
894		break;
895	case MODEKEYEDIT_SWITCHMODEAPPEND:
896	case MODEKEYEDIT_CURSORRIGHT:
897		if (c->prompt_index < size) {
898			c->prompt_index++;
899			c->flags |= CLIENT_STATUS;
900		}
901		break;
902	case MODEKEYEDIT_STARTOFLINE:
903		if (c->prompt_index != 0) {
904			c->prompt_index = 0;
905			c->flags |= CLIENT_STATUS;
906		}
907		break;
908	case MODEKEYEDIT_ENDOFLINE:
909		if (c->prompt_index != size) {
910			c->prompt_index = size;
911			c->flags |= CLIENT_STATUS;
912		}
913		break;
914	case MODEKEYEDIT_COMPLETE:
915		if (*c->prompt_buffer == '\0')
916			break;
917
918		idx = c->prompt_index;
919		if (idx != 0)
920			idx--;
921
922		/* Find the word we are in. */
923		first = c->prompt_buffer + idx;
924		while (first > c->prompt_buffer && *first != ' ')
925			first--;
926		while (*first == ' ')
927			first++;
928		last = c->prompt_buffer + idx;
929		while (*last != '\0' && *last != ' ')
930			last++;
931		while (*last == ' ')
932			last--;
933		if (*last != '\0')
934			last++;
935		if (last <= first ||
936		    ((size_t) (last - first)) > (sizeof word) - 1)
937			break;
938		memcpy(word, first, last - first);
939		word[last - first] = '\0';
940
941		/* And try to complete it. */
942		if ((s = status_prompt_complete(word)) == NULL)
943			break;
944
945		/* Trim out word. */
946		n = size - (last - c->prompt_buffer) + 1; /* with \0 */
947		memmove(first, last, n);
948		size -= last - first;
949
950		/* Insert the new word. */
951 		size += strlen(s);
952		off = first - c->prompt_buffer;
953 		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 1);
954		first = c->prompt_buffer + off;
955 		memmove(first + strlen(s), first, n);
956 		memcpy(first, s, strlen(s));
957
958		c->prompt_index = (first - c->prompt_buffer) + strlen(s);
959		xfree(s);
960
961		c->flags |= CLIENT_STATUS;
962		break;
963	case MODEKEYEDIT_BACKSPACE:
964		if (c->prompt_index != 0) {
965			if (c->prompt_index == size)
966				c->prompt_buffer[--c->prompt_index] = '\0';
967			else {
968				memmove(c->prompt_buffer + c->prompt_index - 1,
969				    c->prompt_buffer + c->prompt_index,
970				    size + 1 - c->prompt_index);
971				c->prompt_index--;
972			}
973			c->flags |= CLIENT_STATUS;
974		}
975		break;
976 	case MODEKEYEDIT_DELETE:
977		if (c->prompt_index != size) {
978			memmove(c->prompt_buffer + c->prompt_index,
979			    c->prompt_buffer + c->prompt_index + 1,
980			    size + 1 - c->prompt_index);
981			c->flags |= CLIENT_STATUS;
982		}
983		break;
984	case MODEKEYEDIT_DELETELINE:
985		*c->prompt_buffer = '\0';
986		c->prompt_index = 0;
987		c->flags |= CLIENT_STATUS;
988		break;
989	case MODEKEYEDIT_DELETETOENDOFLINE:
990		if (c->prompt_index < size) {
991			c->prompt_buffer[c->prompt_index] = '\0';
992			c->flags |= CLIENT_STATUS;
993		}
994		break;
995	case MODEKEYEDIT_HISTORYUP:
996		if (ARRAY_LENGTH(&c->prompt_hdata) == 0)
997			break;
998	       	xfree(c->prompt_buffer);
999
1000		c->prompt_buffer = xstrdup(ARRAY_ITEM(&c->prompt_hdata,
1001		    ARRAY_LENGTH(&c->prompt_hdata) - 1 - c->prompt_hindex));
1002		if (c->prompt_hindex != ARRAY_LENGTH(&c->prompt_hdata) - 1)
1003			c->prompt_hindex++;
1004
1005		c->prompt_index = strlen(c->prompt_buffer);
1006		c->flags |= CLIENT_STATUS;
1007		break;
1008	case MODEKEYEDIT_HISTORYDOWN:
1009		xfree(c->prompt_buffer);
1010
1011		if (c->prompt_hindex != 0) {
1012			c->prompt_hindex--;
1013			c->prompt_buffer = xstrdup(ARRAY_ITEM(
1014			    &c->prompt_hdata, ARRAY_LENGTH(
1015			    &c->prompt_hdata) - 1 - c->prompt_hindex));
1016		} else
1017			c->prompt_buffer = xstrdup("");
1018
1019		c->prompt_index = strlen(c->prompt_buffer);
1020		c->flags |= CLIENT_STATUS;
1021		break;
1022	case MODEKEYEDIT_PASTE:
1023		if ((pb = paste_get_top(&c->session->buffers)) == NULL)
1024			break;
1025		for (n = 0; n < pb->size; n++) {
1026			if (pb->data[n] < 32 || pb->data[n] == 127)
1027				break;
1028		}
1029
1030		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + n + 1);
1031		if (c->prompt_index == size) {
1032			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
1033			c->prompt_index += n;
1034			c->prompt_buffer[c->prompt_index] = '\0';
1035		} else {
1036			memmove(c->prompt_buffer + c->prompt_index + n,
1037			    c->prompt_buffer + c->prompt_index,
1038			    size + 1 - c->prompt_index);
1039			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
1040			c->prompt_index += n;
1041		}
1042
1043		c->flags |= CLIENT_STATUS;
1044		break;
1045	case MODEKEYEDIT_TRANSPOSECHARS:
1046		idx = c->prompt_index;
1047		if (idx < size)
1048			idx++;
1049		if (idx >= 2) {
1050			swapc = c->prompt_buffer[idx - 2];
1051			c->prompt_buffer[idx - 2] = c->prompt_buffer[idx - 1];
1052			c->prompt_buffer[idx - 1] = swapc;
1053			c->prompt_index = idx;
1054			c->flags |= CLIENT_STATUS;
1055		}
1056		break;
1057 	case MODEKEYEDIT_ENTER:
1058		if (*c->prompt_buffer != '\0')
1059			status_prompt_add_history(c);
1060		if (c->prompt_callbackfn(c->prompt_data, c->prompt_buffer) == 0)
1061			status_prompt_clear(c);
1062		break;
1063	case MODEKEYEDIT_CANCEL:
1064		if (c->prompt_callbackfn(c->prompt_data, NULL) == 0)
1065			status_prompt_clear(c);
1066		break;
1067	case MODEKEY_OTHER:
1068		if (key < 32 || key == 127)
1069			break;
1070		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 2);
1071
1072		if (c->prompt_index == size) {
1073			c->prompt_buffer[c->prompt_index++] = key;
1074			c->prompt_buffer[c->prompt_index] = '\0';
1075		} else {
1076			memmove(c->prompt_buffer + c->prompt_index + 1,
1077			    c->prompt_buffer + c->prompt_index,
1078			    size + 1 - c->prompt_index);
1079			c->prompt_buffer[c->prompt_index++] = key;
1080		}
1081
1082		if (c->prompt_flags & PROMPT_SINGLE) {
1083			if (c->prompt_callbackfn(
1084			    c->prompt_data, c->prompt_buffer) == 0)
1085				status_prompt_clear(c);
1086		}
1087
1088		c->flags |= CLIENT_STATUS;
1089		break;
1090	default:
1091		break;
1092	}
1093}
1094
1095/* Add line to the history. */
1096void
1097status_prompt_add_history(struct client *c)
1098{
1099	if (ARRAY_LENGTH(&c->prompt_hdata) > 0 &&
1100	    strcmp(ARRAY_LAST(&c->prompt_hdata), c->prompt_buffer) == 0)
1101		return;
1102
1103	if (ARRAY_LENGTH(&c->prompt_hdata) == PROMPT_HISTORY) {
1104		xfree(ARRAY_FIRST(&c->prompt_hdata));
1105		ARRAY_REMOVE(&c->prompt_hdata, 0);
1106	}
1107
1108	ARRAY_ADD(&c->prompt_hdata, xstrdup(c->prompt_buffer));
1109}
1110
1111/* Complete word. */
1112char *
1113status_prompt_complete(const char *s)
1114{
1115	const struct cmd_entry 	      **cmdent;
1116	const struct set_option_entry  *optent;
1117	ARRAY_DECL(, const char *)	list;
1118	char			       *prefix, *s2;
1119	u_int				i;
1120	size_t			 	j;
1121
1122	if (*s == '\0')
1123		return (NULL);
1124
1125	/* First, build a list of all the possible matches. */
1126	ARRAY_INIT(&list);
1127	for (cmdent = cmd_table; *cmdent != NULL; cmdent++) {
1128		if (strncmp((*cmdent)->name, s, strlen(s)) == 0)
1129			ARRAY_ADD(&list, (*cmdent)->name);
1130	}
1131	for (optent = set_option_table; optent->name != NULL; optent++) {
1132		if (strncmp(optent->name, s, strlen(s)) == 0)
1133			ARRAY_ADD(&list, optent->name);
1134	}
1135	for (optent = set_window_option_table; optent->name != NULL; optent++) {
1136		if (strncmp(optent->name, s, strlen(s)) == 0)
1137			ARRAY_ADD(&list, optent->name);
1138	}
1139
1140	/* If none, bail now. */
1141	if (ARRAY_LENGTH(&list) == 0) {
1142		ARRAY_FREE(&list);
1143		return (NULL);
1144	}
1145
1146	/* If an exact match, return it, with a trailing space. */
1147	if (ARRAY_LENGTH(&list) == 1) {
1148		xasprintf(&s2, "%s ", ARRAY_FIRST(&list));
1149		ARRAY_FREE(&list);
1150		return (s2);
1151	}
1152
1153	/* Now loop through the list and find the longest common prefix. */
1154	prefix = xstrdup(ARRAY_FIRST(&list));
1155	for (i = 1; i < ARRAY_LENGTH(&list); i++) {
1156		s = ARRAY_ITEM(&list, i);
1157
1158		j = strlen(s);
1159		if (j > strlen(prefix))
1160			j = strlen(prefix);
1161		for (; j > 0; j--) {
1162			if (prefix[j - 1] != s[j - 1])
1163				prefix[j - 1] = '\0';
1164		}
1165	}
1166
1167	ARRAY_FREE(&list);
1168	return (prefix);
1169}
1170