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Extend the #[] style syntax and use that together with previous format
changes to allow the status line to be entirely configured with a single
option.

Now that it is possible to configure their content, enable the existing
code that lets the status line be multiple lines in height. The status
option can now take a value of 2, 3, 4 or 5 (as well as the previous on
or off) to configure more than one line. The new status-format array
option configures the format of each line, the default just references
the existing status-* options, although some of the more obscure status
options may be eliminated in time.

Additions to the #[] syntax are: "align" to specify alignment (left,
centre, right), "list" for the window list and "range" to configure
ranges of text for the mouse bindings.

The "align" keyword can also be used to specify alignment of entries in
tree mode and the pane status lines.

/* $OpenBSD: status.c,v 1.192 2019/03/18 20:53:33 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/time.h>

#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

static void	 status_message_callback(int, short, void *);
static void	 status_timer_callback(int, short, void *);

static char	*status_prompt_find_history_file(void);
static const char *status_prompt_up_history(u_int *);
static const char *status_prompt_down_history(u_int *);
static void	 status_prompt_add_history(const char *);

static char    **status_prompt_complete_list(u_int *, const char *);
static char	*status_prompt_complete_prefix(char **, u_int);
static char	*status_prompt_complete(struct session *, const char *);

/* Status prompt history. */
#define PROMPT_HISTORY 100
static char	**status_prompt_hlist;
static u_int	  status_prompt_hsize;

/* Find the history file to load/save from/to. */
static char *
status_prompt_find_history_file(void)
{
	const char	*home, *history_file;
	char		*path;

	history_file = options_get_string(global_options, "history-file");
	if (*history_file == '\0')
		return (NULL);
	if (*history_file == '/')
		return (xstrdup(history_file));

	if (history_file[0] != '~' || history_file[1] != '/')
		return (NULL);
	if ((home = find_home()) == NULL)
		return (NULL);
	xasprintf(&path, "%s%s", home, history_file + 1);
	return (path);
}

/* Load status prompt history from file. */
void
status_prompt_load_history(void)
{
	FILE	*f;
	char	*history_file, *line, *tmp;
	size_t	 length;

	if ((history_file = status_prompt_find_history_file()) == NULL)
		return;
	log_debug("loading history from %s", history_file);

	f = fopen(history_file, "r");
	if (f == NULL) {
		log_debug("%s: %s", history_file, strerror(errno));
		free(history_file);
		return;
	}
	free(history_file);

	for (;;) {
		if ((line = fgetln(f, &length)) == NULL)
			break;

		if (length > 0) {
			if (line[length - 1] == '\n') {
				line[length - 1] = '\0';
				status_prompt_add_history(line);
			} else {
				tmp = xmalloc(length + 1);
				memcpy(tmp, line, length);
				tmp[length] = '\0';
				status_prompt_add_history(tmp);
				free(tmp);
			}
		}
	}
	fclose(f);
}

/* Save status prompt history to file. */
void
status_prompt_save_history(void)
{
	FILE	*f;
	u_int	 i;
	char	*history_file;

	if ((history_file = status_prompt_find_history_file()) == NULL)
		return;
	log_debug("saving history to %s", history_file);

	f = fopen(history_file, "w");
	if (f == NULL) {
		log_debug("%s: %s", history_file, strerror(errno));
		free(history_file);
		return;
	}
	free(history_file);

	for (i = 0; i < status_prompt_hsize; i++) {
		fputs(status_prompt_hlist[i], f);
		fputc('\n', f);
	}
	fclose(f);

}

/* Status timer callback. */
static void
status_timer_callback(__unused int fd, __unused short events, void *arg)
{
	struct client	*c = arg;
	struct session	*s = c->session;
	struct timeval	 tv;

	evtimer_del(&c->status.timer);

	if (s == NULL)
		return;

	if (c->message_string == NULL && c->prompt_string == NULL)
		c->flags |= CLIENT_REDRAWSTATUS;

	timerclear(&tv);
	tv.tv_sec = options_get_number(s->options, "status-interval");

	if (tv.tv_sec != 0)
		evtimer_add(&c->status.timer, &tv);
	log_debug("client %p, status interval %d", c, (int)tv.tv_sec);
}

/* Start status timer for client. */
void
status_timer_start(struct client *c)
{
	struct session	*s = c->session;

	if (event_initialized(&c->status.timer))
		evtimer_del(&c->status.timer);
	else
		evtimer_set(&c->status.timer, status_timer_callback, c);

	if (s != NULL && options_get_number(s->options, "status"))
		status_timer_callback(-1, 0, c);
}

/* Start status timer for all clients. */
void
status_timer_start_all(void)
{
	struct client	*c;

	TAILQ_FOREACH(c, &clients, entry)
		status_timer_start(c);
}

/* Update status cache. */
void
status_update_cache(struct session *s)
{
	s->statuslines = options_get_number(s->options, "status");
	if (s->statuslines == 0)
		s->statusat = -1;
	else if (options_get_number(s->options, "status-position") == 0)
		s->statusat = 0;
	else
		s->statusat = 1;
}

/* Get screen line of status line. -1 means off. */
int
status_at_line(struct client *c)
{
	struct session	*s = c->session;

	if (c->flags & CLIENT_STATUSOFF)
		return (-1);
	if (s->statusat != 1)
		return (s->statusat);
	return (c->tty.sy - status_line_size(c));
}

/* Get size of status line for client's session. 0 means off. */
u_int
status_line_size(struct client *c)
{
	struct session	*s = c->session;

	if (c->flags & CLIENT_STATUSOFF)
		return (0);
	return (s->statuslines);
}

/* Get window at window list position. */
struct style_range *
status_get_range(struct client *c, u_int x, u_int y)
{
	struct status_line	*sl = &c->status;
	struct style_range	*sr;

	if (y >= nitems(sl->entries))
		return (NULL);
	TAILQ_FOREACH(sr, &sl->entries[y].ranges, entry) {
		if (x >= sr->start && x < sr->end)
			return (sr);
	}
	return (NULL);
}

/* Free all ranges. */
static void
status_free_ranges(struct style_ranges *srs)
{
	struct style_range	*sr, *sr1;

	TAILQ_FOREACH_SAFE(sr, srs, entry, sr1) {
		TAILQ_REMOVE(srs, sr, entry);
		free(sr);
	}
}

/* Save old status line. */
static void
status_push_screen(struct client *c)
{
	struct status_line *sl = &c->status;

	if (sl->active == &sl->screen) {
		sl->active = xmalloc(sizeof *sl->active);
		screen_init(sl->active, c->tty.sx, status_line_size(c), 0);
	}
	sl->references++;
}

/* Restore old status line. */
static void
status_pop_screen(struct client *c)
{
	struct status_line *sl = &c->status;

	if (--sl->references == 0) {
		screen_free(sl->active);
		free(sl->active);
		sl->active = &sl->screen;
	}
}

/* Initialize status line. */
void
status_init(struct client *c)
{
	struct status_line	*sl = &c->status;
	u_int			 i;

	for (i = 0; i < nitems(sl->entries); i++)
		TAILQ_INIT(&sl->entries[i].ranges);

	screen_init(&sl->screen, c->tty.sx, 1, 0);
	sl->active = &sl->screen;
}

/* Free status line. */
void
status_free(struct client *c)
{
	struct status_line	*sl = &c->status;
	u_int			 i;

	for (i = 0; i < nitems(sl->entries); i++) {
		status_free_ranges(&sl->entries[i].ranges);
		free((void *)sl->entries[i].expanded);
	}

	if (event_initialized(&sl->timer))
		evtimer_del(&sl->timer);

	if (sl->active != &sl->screen) {
		screen_free(sl->active);
		free(sl->active);
	}
	screen_free(&sl->screen);
}

/* Draw status line for client. */
int
status_redraw(struct client *c)
{
	struct status_line		*sl = &c->status;
	struct status_line_entry	*sle;
	struct session			*s = c->session;
	struct screen_write_ctx		 ctx;
	struct grid_cell		 gc;
	u_int				 lines, i, width = c->tty.sx;
	int				 flags, force = 0, changed = 0;
	struct options_entry		*o;
	struct format_tree		*ft;
	const char			*fmt;
	char				*expanded;

	log_debug("%s enter", __func__);

	/* Shouldn't get here if not the active screen. */
	if (sl->active != &sl->screen)
		fatalx("not the active screen");

	/* No status line? */
	lines = status_line_size(c);
	if (c->tty.sy == 0 || lines == 0)
		return (1);

	/* Set up default colour. */
	style_apply(&gc, s->options, "status-style");
	if (!grid_cells_equal(&gc, &sl->style)) {
		force = 1;
		memcpy(&sl->style, &gc, sizeof sl->style);
	}

	/* Resize the target screen. */
	if (screen_size_x(&sl->screen) != width ||
	    screen_size_y(&sl->screen) != lines) {
		if (screen_size_x(&sl->screen) != width)
			force = 1;
		screen_resize(&sl->screen, width, lines, 0);
		changed = 1;
	}
	screen_write_start(&ctx, NULL, &sl->screen);

	/* Create format tree. */
	flags = FORMAT_STATUS;
	if (c->flags & CLIENT_STATUSFORCE)
		flags |= FORMAT_FORCE;
	ft = format_create(c, NULL, FORMAT_NONE, flags);
	format_defaults(ft, c, NULL, NULL, NULL);

	/* Write the status lines. */
	o = options_get(s->options, "status-format");
	if (o == NULL)
		screen_write_clearscreen(&ctx, gc.bg);
	else {
		for (i = 0; i < lines; i++) {
			screen_write_cursormove(&ctx, 0, i, 0);

			fmt = options_array_get(o, i);
			if (fmt == NULL) {
				screen_write_clearline(&ctx, gc.bg);
				continue;
			}
			sle = &sl->entries[i];

			expanded = format_expand_time(ft, fmt);
			if (!force &&
			    sle->expanded != NULL &&
			    strcmp(expanded, sle->expanded) == 0) {
				free(expanded);
				continue;
			}
			changed = 1;

			screen_write_clearline(&ctx, gc.bg);
			status_free_ranges(&sle->ranges);
			format_draw(&ctx, &gc, width, expanded, &sle->ranges);

			free(sle->expanded);
			sle->expanded = expanded;
		}
	}
	screen_write_stop(&ctx);

	/* Free the format tree. */
	format_free(ft);

	/* Return if the status line has changed. */
	log_debug("%s exit: force=%d, changed=%d", __func__, force, changed);
	return (force || changed);
}

/* Set a status line message. */
void
status_message_set(struct client *c, const char *fmt, ...)
{
	struct timeval	tv;
	va_list		ap;
	int		delay;

	status_message_clear(c);
	status_push_screen(c);

	va_start(ap, fmt);
	xvasprintf(&c->message_string, fmt, ap);
	va_end(ap);

	server_client_add_message(c, "%s", c->message_string);

	delay = options_get_number(c->session->options, "display-time");
	if (delay > 0) {
		tv.tv_sec = delay / 1000;
		tv.tv_usec = (delay % 1000) * 1000L;

		if (event_initialized(&c->message_timer))
			evtimer_del(&c->message_timer);
		evtimer_set(&c->message_timer, status_message_callback, c);
		evtimer_add(&c->message_timer, &tv);
	}

	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
	c->flags |= CLIENT_REDRAWSTATUS;
}

/* Clear status line message. */
void
status_message_clear(struct client *c)
{
	if (c->message_string == NULL)
		return;

	free(c->message_string);
	c->message_string = NULL;

	if (c->prompt_string == NULL)
		c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
	c->flags |= CLIENT_ALLREDRAWFLAGS; /* was frozen and may have changed */

	status_pop_screen(c);
}

/* Clear status line message after timer expires. */
static void
status_message_callback(__unused int fd, __unused short event, void *data)
{
	struct client	*c = data;

	status_message_clear(c);
}

/* Draw client message on status line of present else on last line. */
int
status_message_redraw(struct client *c)
{
	struct status_line	*sl = &c->status;
	struct screen_write_ctx	 ctx;
	struct session		*s = c->session;
	struct screen		 old_screen;
	size_t			 len;
	u_int			 lines, offset;
	struct grid_cell	 gc;

	if (c->tty.sx == 0 || c->tty.sy == 0)
		return (0);
	memcpy(&old_screen, sl->active, sizeof old_screen);

	lines = status_line_size(c);
	if (lines <= 1)
		lines = 1;
	screen_init(sl->active, c->tty.sx, lines, 0);

	len = screen_write_strlen("%s", c->message_string);
	if (len > c->tty.sx)
		len = c->tty.sx;

	style_apply(&gc, s->options, "message-style");

	screen_write_start(&ctx, NULL, sl->active);
	screen_write_fast_copy(&ctx, &sl->screen, 0, 0, c->tty.sx, lines - 1);
	screen_write_cursormove(&ctx, 0, lines - 1, 0);
	for (offset = 0; offset < c->tty.sx; offset++)
		screen_write_putc(&ctx, &gc, ' ');
	screen_write_cursormove(&ctx, 0, lines - 1, 0);
	screen_write_nputs(&ctx, len, &gc, "%s", c->message_string);
	screen_write_stop(&ctx);

	if (grid_compare(sl->active->grid, old_screen.grid) == 0) {
		screen_free(&old_screen);
		return (0);
	}
	screen_free(&old_screen);
	return (1);
}

/* Enable status line prompt. */
void
status_prompt_set(struct client *c, const char *msg, const char *input,
    prompt_input_cb inputcb, prompt_free_cb freecb, void *data, int flags)
{
	struct format_tree	*ft;
	char			*tmp, *cp;

	ft = format_create(c, NULL, FORMAT_NONE, 0);
	format_defaults(ft, c, NULL, NULL, NULL);

	if (input == NULL)
		input = "";
	if (flags & PROMPT_NOFORMAT)
		tmp = xstrdup(input);
	else
		tmp = format_expand_time(ft, input);

	status_message_clear(c);
	status_prompt_clear(c);
	status_push_screen(c);

	c->prompt_string = format_expand_time(ft, msg);

	c->prompt_buffer = utf8_fromcstr(tmp);
	c->prompt_index = utf8_strlen(c->prompt_buffer);

	c->prompt_inputcb = inputcb;
	c->prompt_freecb = freecb;
	c->prompt_data = data;

	c->prompt_hindex = 0;

	c->prompt_flags = flags;
	c->prompt_mode = PROMPT_ENTRY;

	if (~flags & PROMPT_INCREMENTAL)
		c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
	c->flags |= CLIENT_REDRAWSTATUS;

	if ((flags & PROMPT_INCREMENTAL) && *tmp != '\0') {
		xasprintf(&cp, "=%s", tmp);
		c->prompt_inputcb(c, c->prompt_data, cp, 0);
		free(cp);
	}

	free(tmp);
	format_free(ft);
}

/* Remove status line prompt. */
void
status_prompt_clear(struct client *c)
{
	if (c->prompt_string == NULL)
		return;

	if (c->prompt_freecb != NULL && c->prompt_data != NULL)
		c->prompt_freecb(c->prompt_data);

	free(c->prompt_string);
	c->prompt_string = NULL;

	free(c->prompt_buffer);
	c->prompt_buffer = NULL;

	free(c->prompt_saved);
	c->prompt_saved = NULL;

	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
	c->flags |= CLIENT_ALLREDRAWFLAGS; /* was frozen and may have changed */

	status_pop_screen(c);
}

/* Update status line prompt with a new prompt string. */
void
status_prompt_update(struct client *c, const char *msg, const char *input)
{
	struct format_tree	*ft;
	char			*tmp;

	ft = format_create(c, NULL, FORMAT_NONE, 0);
	format_defaults(ft, c, NULL, NULL, NULL);

	tmp = format_expand_time(ft, input);

	free(c->prompt_string);
	c->prompt_string = format_expand_time(ft, msg);

	free(c->prompt_buffer);
	c->prompt_buffer = utf8_fromcstr(tmp);
	c->prompt_index = utf8_strlen(c->prompt_buffer);

	c->prompt_hindex = 0;

	c->flags |= CLIENT_REDRAWSTATUS;

	free(tmp);
	format_free(ft);
}

/* Draw client prompt on status line of present else on last line. */
int
status_prompt_redraw(struct client *c)
{
	struct status_line	*sl = &c->status;
	struct screen_write_ctx	 ctx;
	struct session		*s = c->session;
	struct screen		 old_screen;
	u_int			 i, lines, offset, left, start, width;
	u_int			 pcursor, pwidth;
	struct grid_cell	 gc, cursorgc;

	if (c->tty.sx == 0 || c->tty.sy == 0)
		return (0);
	memcpy(&old_screen, sl->active, sizeof old_screen);

	lines = status_line_size(c);
	if (lines <= 1)
		lines = 1;
	screen_init(sl->active, c->tty.sx, lines, 0);

	if (c->prompt_mode == PROMPT_COMMAND)
		style_apply(&gc, s->options, "message-command-style");
	else
		style_apply(&gc, s->options, "message-style");

	memcpy(&cursorgc, &gc, sizeof cursorgc);
	cursorgc.attr ^= GRID_ATTR_REVERSE;

	start = screen_write_strlen("%s", c->prompt_string);
	if (start > c->tty.sx)
		start = c->tty.sx;

	screen_write_start(&ctx, NULL, sl->active);
	screen_write_fast_copy(&ctx, &sl->screen, 0, 0, c->tty.sx, lines - 1);
	screen_write_cursormove(&ctx, 0, lines - 1, 0);
	for (offset = 0; offset < c->tty.sx; offset++)
		screen_write_putc(&ctx, &gc, ' ');
	screen_write_cursormove(&ctx, 0, lines - 1, 0);
	screen_write_nputs(&ctx, start, &gc, "%s", c->prompt_string);
	screen_write_cursormove(&ctx, start, lines - 1, 0);

	left = c->tty.sx - start;
	if (left == 0)
		goto finished;

	pcursor = utf8_strwidth(c->prompt_buffer, c->prompt_index);
	pwidth = utf8_strwidth(c->prompt_buffer, -1);
	if (pcursor >= left) {
		/*
		 * The cursor would be outside the screen so start drawing
		 * with it on the right.
		 */
		offset = (pcursor - left) + 1;
		pwidth = left;
	} else
		offset = 0;
	if (pwidth > left)
		pwidth = left;

	width = 0;
	for (i = 0; c->prompt_buffer[i].size != 0; i++) {
		if (width < offset) {
			width += c->prompt_buffer[i].width;
			continue;
		}
		if (width >= offset + pwidth)
			break;
		width += c->prompt_buffer[i].width;
		if (width > offset + pwidth)
			break;

		if (i != c->prompt_index) {
			utf8_copy(&gc.data, &c->prompt_buffer[i]);
			screen_write_cell(&ctx, &gc);
		} else {
			utf8_copy(&cursorgc.data, &c->prompt_buffer[i]);
			screen_write_cell(&ctx, &cursorgc);
		}
	}
	if (sl->active->cx < screen_size_x(sl->active) && c->prompt_index >= i)
		screen_write_putc(&ctx, &cursorgc, ' ');

finished:
	screen_write_stop(&ctx);

	if (grid_compare(sl->active->grid, old_screen.grid) == 0) {
		screen_free(&old_screen);
		return (0);
	}
	screen_free(&old_screen);
	return (1);
}

/* Is this a separator? */
static int
status_prompt_in_list(const char *ws, const struct utf8_data *ud)
{
	if (ud->size != 1 || ud->width != 1)
		return (0);
	return (strchr(ws, *ud->data) != NULL);
}

/* Is this a space? */
static int
status_prompt_space(const struct utf8_data *ud)
{
	if (ud->size != 1 || ud->width != 1)
		return (0);
	return (*ud->data == ' ');
}

/*
 * Translate key from emacs to vi. Return 0 to drop key, 1 to process the key
 * as an emacs key; return 2 to append to the buffer.
 */
static int
status_prompt_translate_key(struct client *c, key_code key, key_code *new_key)
{
	if (c->prompt_mode == PROMPT_ENTRY) {
		switch (key) {
		case '\003': /* C-c */
		case '\010': /* C-h */
		case '\011': /* Tab */
		case '\025': /* C-u */
		case '\027': /* C-w */
		case '\n':
		case '\r':
		case KEYC_BSPACE:
		case KEYC_DC:
		case KEYC_DOWN:
		case KEYC_END:
		case KEYC_HOME:
		case KEYC_LEFT:
		case KEYC_RIGHT:
		case KEYC_UP:
			*new_key = key;
			return (1);
		case '\033': /* Escape */
			c->prompt_mode = PROMPT_COMMAND;
			c->flags |= CLIENT_REDRAWSTATUS;
			return (0);
		}
		*new_key = key;
		return (2);
	}

	switch (key) {
	case 'A':
	case 'I':
	case 'C':
	case 's':
	case 'a':
		c->prompt_mode = PROMPT_ENTRY;
		c->flags |= CLIENT_REDRAWSTATUS;
		break; /* switch mode and... */
	case 'S':
		c->prompt_mode = PROMPT_ENTRY;
		c->flags |= CLIENT_REDRAWSTATUS;
		*new_key = '\025'; /* C-u */
		return (1);
	case 'i':
	case '\033': /* Escape */
		c->prompt_mode = PROMPT_ENTRY;
		c->flags |= CLIENT_REDRAWSTATUS;
		return (0);
	}

	switch (key) {
	case 'A':
	case '$':
		*new_key = KEYC_END;
		return (1);
	case 'I':
	case '0':
	case '^':
		*new_key = KEYC_HOME;
		return (1);
	case 'C':
	case 'D':
		*new_key = '\013'; /* C-k */
		return (1);
	case KEYC_BSPACE:
	case 'X':
		*new_key = KEYC_BSPACE;
		return (1);
	case 'b':
	case 'B':
		*new_key = 'b'|KEYC_ESCAPE;
		return (1);
	case 'd':
		*new_key = '\025';
		return (1);
	case 'e':
	case 'E':
	case 'w':
	case 'W':
		*new_key = 'f'|KEYC_ESCAPE;
		return (1);
	case 'p':
		*new_key = '\031'; /* C-y */
		return (1);
	case 's':
	case KEYC_DC:
	case 'x':
		*new_key = KEYC_DC;
		return (1);
	case KEYC_DOWN:
	case 'j':
		*new_key = KEYC_DOWN;
		return (1);
	case KEYC_LEFT:
	case 'h':
		*new_key = KEYC_LEFT;
		return (1);
	case 'a':
	case KEYC_RIGHT:
	case 'l':
		*new_key = KEYC_RIGHT;
		return (1);
	case KEYC_UP:
	case 'k':
		*new_key = KEYC_UP;
		return (1);
	case '\010' /* C-h */:
	case '\003' /* C-c */:
	case '\n':
	case '\r':
		return (1);
	}
	return (0);
}

/* Handle keys in prompt. */
int
status_prompt_key(struct client *c, key_code key)
{
	struct options		*oo = c->session->options;
	struct paste_buffer	*pb;
	char			*s, *cp, word[64], prefix = '=';
	const char		*histstr, *bufdata, *ws = NULL;
	u_char			 ch;
	size_t			 size, n, off, idx, bufsize, used;
	struct utf8_data	 tmp, *first, *last, *ud;
	int			 keys;

	size = utf8_strlen(c->prompt_buffer);

	if (c->prompt_flags & PROMPT_NUMERIC) {
		if (key >= '0' && key <= '9')
			goto append_key;
		s = utf8_tocstr(c->prompt_buffer);
		c->prompt_inputcb(c, c->prompt_data, s, 1);
		status_prompt_clear(c);
		free(s);
		return (1);
	}
	key &= ~KEYC_XTERM;

	keys = options_get_number(c->session->options, "status-keys");
	if (keys == MODEKEY_VI) {
		switch (status_prompt_translate_key(c, key, &key)) {
		case 1:
			goto process_key;
		case 2:
			goto append_key;
		default:
			return (0);
		}
	}

process_key:
	switch (key) {
	case KEYC_LEFT:
	case '\002': /* C-b */
		if (c->prompt_index > 0) {
			c->prompt_index--;
			break;
		}
		break;
	case KEYC_RIGHT:
	case '\006': /* C-f */
		if (c->prompt_index < size) {
			c->prompt_index++;
			break;
		}
		break;
	case KEYC_HOME:
	case '\001': /* C-a */
		if (c->prompt_index != 0) {
			c->prompt_index = 0;
			break;
		}
		break;
	case KEYC_END:
	case '\005': /* C-e */
		if (c->prompt_index != size) {
			c->prompt_index = size;
			break;
		}
		break;
	case '\011': /* Tab */
		if (c->prompt_buffer[0].size == 0)
			break;

		idx = c->prompt_index;
		if (idx != 0)
			idx--;

		/* Find the word we are in. */
		first = &c->prompt_buffer[idx];
		while (first > c->prompt_buffer && !status_prompt_space(first))
			first--;
		while (first->size != 0 && status_prompt_space(first))
			first++;
		last = &c->prompt_buffer[idx];
		while (last->size != 0 && !status_prompt_space(last))
			last++;
		while (last > c->prompt_buffer && status_prompt_space(last))
			last--;
		if (last->size != 0)
			last++;
		if (last <= first)
			break;

		used = 0;
		for (ud = first; ud < last; ud++) {
			if (used + ud->size >= sizeof word)
				break;
			memcpy(word + used, ud->data, ud->size);
			used += ud->size;
		}
		if (ud != last)
			break;
		word[used] = '\0';

		/* And try to complete it. */
		if ((s = status_prompt_complete(c->session, word)) == NULL)
			break;

		/* Trim out word. */
		n = size - (last - c->prompt_buffer) + 1; /* with \0 */
		memmove(first, last, n * sizeof *c->prompt_buffer);
		size -= last - first;

		/* Insert the new word. */
		size += strlen(s);
		off = first - c->prompt_buffer;
		c->prompt_buffer = xreallocarray(c->prompt_buffer, size + 1,
		    sizeof *c->prompt_buffer);
		first = c->prompt_buffer + off;
		memmove(first + strlen(s), first, n * sizeof *c->prompt_buffer);
		for (idx = 0; idx < strlen(s); idx++)
			utf8_set(&first[idx], s[idx]);

		c->prompt_index = (first - c->prompt_buffer) + strlen(s);
		free(s);

		goto changed;
	case KEYC_BSPACE:
	case '\010': /* C-h */
		if (c->prompt_index != 0) {
			if (c->prompt_index == size)
				c->prompt_buffer[--c->prompt_index].size = 0;
			else {
				memmove(c->prompt_buffer + c->prompt_index - 1,
				    c->prompt_buffer + c->prompt_index,
				    (size + 1 - c->prompt_index) *
				    sizeof *c->prompt_buffer);
				c->prompt_index--;
			}
			goto changed;
		}
		break;
	case KEYC_DC:
	case '\004': /* C-d */
		if (c->prompt_index != size) {
			memmove(c->prompt_buffer + c->prompt_index,
			    c->prompt_buffer + c->prompt_index + 1,
			    (size + 1 - c->prompt_index) *
			    sizeof *c->prompt_buffer);
			goto changed;
		}
		break;
	case '\025': /* C-u */
		c->prompt_buffer[0].size = 0;
		c->prompt_index = 0;
		goto changed;
	case '\013': /* C-k */
		if (c->prompt_index < size) {
			c->prompt_buffer[c->prompt_index].size = 0;
			goto changed;
		}
		break;
	case '\027': /* C-w */
		ws = options_get_string(oo, "word-separators");
		idx = c->prompt_index;

		/* Find a non-separator. */
		while (idx != 0) {
			idx--;
			if (!status_prompt_in_list(ws, &c->prompt_buffer[idx]))
				break;
		}

		/* Find the separator at the beginning of the word. */
		while (idx != 0) {
			idx--;
			if (status_prompt_in_list(ws, &c->prompt_buffer[idx])) {
				/* Go back to the word. */
				idx++;
				break;
			}
		}

		free(c->prompt_saved);
		c->prompt_saved = xcalloc(sizeof *c->prompt_buffer,
		    (c->prompt_index - idx) + 1);
		memcpy(c->prompt_saved, c->prompt_buffer + idx,
		    (c->prompt_index - idx) * sizeof *c->prompt_buffer);

		memmove(c->prompt_buffer + idx,
		    c->prompt_buffer + c->prompt_index,
		    (size + 1 - c->prompt_index) *
		    sizeof *c->prompt_buffer);
		memset(c->prompt_buffer + size - (c->prompt_index - idx),
		    '\0', (c->prompt_index - idx) * sizeof *c->prompt_buffer);
		c->prompt_index = idx;

		goto changed;
	case 'f'|KEYC_ESCAPE:
	case KEYC_RIGHT|KEYC_CTRL:
		ws = options_get_string(oo, "word-separators");

		/* Find a word. */
		while (c->prompt_index != size) {
			idx = ++c->prompt_index;
			if (!status_prompt_in_list(ws, &c->prompt_buffer[idx]))
				break;
		}

		/* Find the separator at the end of the word. */
		while (c->prompt_index != size) {
			idx = ++c->prompt_index;
			if (status_prompt_in_list(ws, &c->prompt_buffer[idx]))
				break;
		}

		/* Back up to the end-of-word like vi. */
		if (options_get_number(oo, "status-keys") == MODEKEY_VI &&
		    c->prompt_index != 0)
			c->prompt_index--;

		goto changed;
	case 'b'|KEYC_ESCAPE:
	case KEYC_LEFT|KEYC_CTRL:
		ws = options_get_string(oo, "word-separators");

		/* Find a non-separator. */
		while (c->prompt_index != 0) {
			idx = --c->prompt_index;
			if (!status_prompt_in_list(ws, &c->prompt_buffer[idx]))
				break;
		}

		/* Find the separator at the beginning of the word. */
		while (c->prompt_index != 0) {
			idx = --c->prompt_index;
			if (status_prompt_in_list(ws, &c->prompt_buffer[idx])) {
				/* Go back to the word. */
				c->prompt_index++;
				break;
			}
		}
		goto changed;
	case KEYC_UP:
	case '\020': /* C-p */
		histstr = status_prompt_up_history(&c->prompt_hindex);
		if (histstr == NULL)
			break;
		free(c->prompt_buffer);
		c->prompt_buffer = utf8_fromcstr(histstr);
		c->prompt_index = utf8_strlen(c->prompt_buffer);
		goto changed;
	case KEYC_DOWN:
	case '\016': /* C-n */
		histstr = status_prompt_down_history(&c->prompt_hindex);
		if (histstr == NULL)
			break;
		free(c->prompt_buffer);
		c->prompt_buffer = utf8_fromcstr(histstr);
		c->prompt_index = utf8_strlen(c->prompt_buffer);
		goto changed;
	case '\031': /* C-y */
		if (c->prompt_saved != NULL) {
			ud = c->prompt_saved;
			n = utf8_strlen(c->prompt_saved);
		} else {
			if ((pb = paste_get_top(NULL)) == NULL)
				break;
			bufdata = paste_buffer_data(pb, &bufsize);
			for (n = 0; n < bufsize; n++) {
				ch = (u_char)bufdata[n];
				if (ch < 32 || ch >= 127)
					break;
			}
			ud = xreallocarray(NULL, n, sizeof *ud);
			for (idx = 0; idx < n; idx++)
				utf8_set(&ud[idx], bufdata[idx]);
		}

		c->prompt_buffer = xreallocarray(c->prompt_buffer, size + n + 1,
		    sizeof *c->prompt_buffer);
		if (c->prompt_index == size) {
			memcpy(c->prompt_buffer + c->prompt_index, ud,
			    n * sizeof *c->prompt_buffer);
			c->prompt_index += n;
			c->prompt_buffer[c->prompt_index].size = 0;
		} else {
			memmove(c->prompt_buffer + c->prompt_index + n,
			    c->prompt_buffer + c->prompt_index,
			    (size + 1 - c->prompt_index) *
			    sizeof *c->prompt_buffer);
			memcpy(c->prompt_buffer + c->prompt_index, ud,
			    n * sizeof *c->prompt_buffer);
			c->prompt_index += n;
		}

		if (ud != c->prompt_saved)
			free(ud);
		goto changed;
	case '\024': /* C-t */
		idx = c->prompt_index;
		if (idx < size)
			idx++;
		if (idx >= 2) {
			utf8_copy(&tmp, &c->prompt_buffer[idx - 2]);
			utf8_copy(&c->prompt_buffer[idx - 2],
			    &c->prompt_buffer[idx - 1]);
			utf8_copy(&c->prompt_buffer[idx - 1], &tmp);
			c->prompt_index = idx;
			goto changed;
		}
		break;
	case '\r':
	case '\n':
		s = utf8_tocstr(c->prompt_buffer);
		if (*s != '\0')
			status_prompt_add_history(s);
		if (c->prompt_inputcb(c, c->prompt_data, s, 1) == 0)
			status_prompt_clear(c);
		free(s);
		break;
	case '\033': /* Escape */
	case '\003': /* C-c */
	case '\007': /* C-g */
		if (c->prompt_inputcb(c, c->prompt_data, NULL, 1) == 0)
			status_prompt_clear(c);
		break;
	case '\022': /* C-r */
		if (c->prompt_flags & PROMPT_INCREMENTAL) {
			prefix = '-';
			goto changed;
		}
		break;
	case '\023': /* C-s */
		if (c->prompt_flags & PROMPT_INCREMENTAL) {
			prefix = '+';
			goto changed;
		}
		break;
	default:
		goto append_key;
	}

	c->flags |= CLIENT_REDRAWSTATUS;
	return (0);

append_key:
	if (key <= 0x1f || key >= KEYC_BASE)
		return (0);
	if (utf8_split(key, &tmp) != UTF8_DONE)
		return (0);

	c->prompt_buffer = xreallocarray(c->prompt_buffer, size + 2,
	    sizeof *c->prompt_buffer);

	if (c->prompt_index == size) {
		utf8_copy(&c->prompt_buffer[c->prompt_index], &tmp);
		c->prompt_index++;
		c->prompt_buffer[c->prompt_index].size = 0;
	} else {
		memmove(c->prompt_buffer + c->prompt_index + 1,
		    c->prompt_buffer + c->prompt_index,
		    (size + 1 - c->prompt_index) *
		    sizeof *c->prompt_buffer);
		utf8_copy(&c->prompt_buffer[c->prompt_index], &tmp);
		c->prompt_index++;
	}

	if (c->prompt_flags & PROMPT_SINGLE) {
		s = utf8_tocstr(c->prompt_buffer);
		if (strlen(s) != 1)
			status_prompt_clear(c);
		else if (c->prompt_inputcb(c, c->prompt_data, s, 1) == 0)
			status_prompt_clear(c);
		free(s);
	}

changed:
	c->flags |= CLIENT_REDRAWSTATUS;
	if (c->prompt_flags & PROMPT_INCREMENTAL) {
		s = utf8_tocstr(c->prompt_buffer);
		xasprintf(&cp, "%c%s", prefix, s);
		c->prompt_inputcb(c, c->prompt_data, cp, 0);
		free(cp);
		free(s);
	}
	return (0);
}

/* Get previous line from the history. */
static const char *
status_prompt_up_history(u_int *idx)
{
	/*
	 * History runs from 0 to size - 1. Index is from 0 to size. Zero is
	 * empty.
	 */

	if (status_prompt_hsize == 0 || *idx == status_prompt_hsize)
		return (NULL);
	(*idx)++;
	return (status_prompt_hlist[status_prompt_hsize - *idx]);
}

/* Get next line from the history. */
static const char *
status_prompt_down_history(u_int *idx)
{
	if (status_prompt_hsize == 0 || *idx == 0)
		return ("");
	(*idx)--;
	if (*idx == 0)
		return ("");
	return (status_prompt_hlist[status_prompt_hsize - *idx]);
}

/* Add line to the history. */
static void
status_prompt_add_history(const char *line)
{
	size_t	size;

	if (status_prompt_hsize > 0 &&
	    strcmp(status_prompt_hlist[status_prompt_hsize - 1], line) == 0)
		return;

	if (status_prompt_hsize == PROMPT_HISTORY) {
		free(status_prompt_hlist[0]);

		size = (PROMPT_HISTORY - 1) * sizeof *status_prompt_hlist;
		memmove(&status_prompt_hlist[0], &status_prompt_hlist[1], size);

		status_prompt_hlist[status_prompt_hsize - 1] = xstrdup(line);
		return;
	}

	status_prompt_hlist = xreallocarray(status_prompt_hlist,
	    status_prompt_hsize + 1, sizeof *status_prompt_hlist);
	status_prompt_hlist[status_prompt_hsize++] = xstrdup(line);
}

/* Build completion list. */
char **
status_prompt_complete_list(u_int *size, const char *s)
{
	char					**list = NULL;
	const char				**layout, *value, *cp;
	const struct cmd_entry			**cmdent;
	const struct options_table_entry	 *oe;
	u_int					  idx;
	size_t					  slen = strlen(s), valuelen;
	struct options_entry			 *o;
	struct options_array_item		 *a;
	const char				 *layouts[] = {
		"even-horizontal", "even-vertical", "main-horizontal",
		"main-vertical", "tiled", NULL
	};

	*size = 0;
	for (cmdent = cmd_table; *cmdent != NULL; cmdent++) {
		if (strncmp((*cmdent)->name, s, slen) == 0) {
			list = xreallocarray(list, (*size) + 1, sizeof *list);
			list[(*size)++] = xstrdup((*cmdent)->name);
		}
	}
	for (oe = options_table; oe->name != NULL; oe++) {
		if (strncmp(oe->name, s, slen) == 0) {
			list = xreallocarray(list, (*size) + 1, sizeof *list);
			list[(*size)++] = xstrdup(oe->name);
		}
	}
	for (layout = layouts; *layout != NULL; layout++) {
		if (strncmp(*layout, s, slen) == 0) {
			list = xreallocarray(list, (*size) + 1, sizeof *list);
			list[(*size)++] = xstrdup(*layout);
		}
	}
	o = options_get_only(global_options, "command-alias");
	if (o != NULL) {
		a = options_array_first(o);
		while (a != NULL) {
			value = options_array_item_value(a);;
			if (value == NULL || (cp = strchr(value, '=')) == NULL)
				goto next;

			valuelen = cp - value;
			if (slen > valuelen || strncmp(value, s, slen) != 0)
				goto next;

			list = xreallocarray(list, (*size) + 1, sizeof *list);
			list[(*size)++] = xstrndup(value, valuelen);

		next:
			a = options_array_next(a);
		}
	}
	for (idx = 0; idx < (*size); idx++)
		log_debug("complete %u: %s", idx, list[idx]);
	return (list);
}

/* Find longest prefix. */
static char *
status_prompt_complete_prefix(char **list, u_int size)
{
	char	 *out;
	u_int	  i;
	size_t	  j;

	out = xstrdup(list[0]);
	for (i = 1; i < size; i++) {
		j = strlen(list[i]);
		if (j > strlen(out))
			j = strlen(out);
		for (; j > 0; j--) {
			if (out[j - 1] != list[i][j - 1])
				out[j - 1] = '\0';
		}
	}
	return (out);
}

/* Complete word. */
static char *
status_prompt_complete(struct session *session, const char *s)
{
	char		**list = NULL;
	const char	 *colon;
	u_int		  size = 0, i;
	struct session	 *s_loop;
	struct winlink	 *wl;
	struct window	 *w;
	char		 *copy, *out, *tmp;

	if (*s == '\0')
		return (NULL);
	out = NULL;

	if (strncmp(s, "-t", 2) != 0 && strncmp(s, "-s", 2) != 0) {
		list = status_prompt_complete_list(&size, s);
		if (size == 0)
			out = NULL;
		else if (size == 1)
			xasprintf(&out, "%s ", list[0]);
		else
			out = status_prompt_complete_prefix(list, size);
		for (i = 0; i < size; i++)
			free(list[i]);
		free(list);
		return (out);
	}
	copy = xstrdup(s);

	colon = ":";
	if (copy[strlen(copy) - 1] == ':')
		copy[strlen(copy) - 1] = '\0';
	else
		colon = "";
	s = copy + 2;

	RB_FOREACH(s_loop, sessions, &sessions) {
		if (strncmp(s_loop->name, s, strlen(s)) == 0) {
			list = xreallocarray(list, size + 2, sizeof *list);
			list[size++] = s_loop->name;
		}
	}
	if (size == 1) {
		out = xstrdup(list[0]);
		if (session_find(list[0]) != NULL)
			colon = ":";
	} else if (size != 0)
		out = status_prompt_complete_prefix(list, size);
	if (out != NULL) {
		xasprintf(&tmp, "-%c%s%s", copy[1], out, colon);
		free(out);
		out = tmp;
		goto found;
	}

	colon = "";
	if (*s == ':') {
		RB_FOREACH(wl, winlinks, &session->windows) {
			xasprintf(&tmp, ":%s", wl->window->name);
			if (strncmp(tmp, s, strlen(s)) == 0){
				list = xreallocarray(list, size + 1,
				    sizeof *list);
				list[size++] = tmp;
				continue;
			}
			free(tmp);

			xasprintf(&tmp, ":%d", wl->idx);
			if (strncmp(tmp, s, strlen(s)) == 0) {
				list = xreallocarray(list, size + 1,
				    sizeof *list);
				list[size++] = tmp;
				continue;
			}
			free(tmp);
		}
	} else {
		RB_FOREACH(s_loop, sessions, &sessions) {
			RB_FOREACH(wl, winlinks, &s_loop->windows) {
				w = wl->window;

				xasprintf(&tmp, "%s:%s", s_loop->name, w->name);
				if (strncmp(tmp, s, strlen(s)) == 0) {
					list = xreallocarray(list, size + 1,
					    sizeof *list);
					list[size++] = tmp;
					continue;
				}
				free(tmp);

				xasprintf(&tmp, "%s:%d", s_loop->name, wl->idx);
				if (strncmp(tmp, s, strlen(s)) == 0) {
					list = xreallocarray(list, size + 1,
					    sizeof *list);
					list[size++] = tmp;
					continue;
				}
				free(tmp);
			}
		}
	}
	if (size == 1) {
		out = xstrdup(list[0]);
		colon = " ";
	} else if (size != 0)
		out = status_prompt_complete_prefix(list, size);
	if (out != NULL) {
		xasprintf(&tmp, "-%c%s%s", copy[1], out, colon);
		out = tmp;
	}

	for (i = 0; i < size; i++)
		free((void *)list[i]);

found:
	free(copy);
	free(list);
	return (out);
}