Do not call event_del() for signals after fork(), just use sigaction()

[tmux-openbsd.git] / status.c

/* $OpenBSD$ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * 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"

char   *status_redraw_get_left(
            struct client *, time_t, int, struct grid_cell *, size_t *);
char   *status_redraw_get_right(
            struct client *, time_t, int, struct grid_cell *, size_t *);
char   *status_job(struct client *, char **);
void    status_job_callback(struct job *);
char   *status_print(
            struct client *, struct winlink *, time_t, struct grid_cell *);
void    status_replace1(struct client *,
            struct winlink *, char **, char **, char *, size_t, int);
void    status_message_callback(int, short, void *);

void    status_prompt_add_history(struct client *);
char   *status_prompt_complete(const char *);

/* Retrieve options for left string. */
char *
status_redraw_get_left(struct client *c,
    time_t t, int utf8flag, struct grid_cell *gc, size_t *size)
{
        struct session  *s = c->session;
        char            *left;
        u_char           fg, bg, attr;
        size_t           leftlen;

        fg = options_get_number(&s->options, "status-left-fg");
        if (fg != 8)
                colour_set_fg(gc, fg);
        bg = options_get_number(&s->options, "status-left-bg");
        if (bg != 8)
                colour_set_bg(gc, bg);
        attr = options_get_number(&s->options, "status-left-attr");
        if (attr != 0)
                gc->attr = attr;

        left = status_replace(
            c, NULL, options_get_string(&s->options, "status-left"), t, 1);

        *size = options_get_number(&s->options, "status-left-length");
        leftlen = screen_write_cstrlen(utf8flag, "%s", left);
        if (leftlen < *size)
                *size = leftlen;
        return (left);
}

/* Retrieve options for right string. */
char *
status_redraw_get_right(struct client *c,
    time_t t, int utf8flag, struct grid_cell *gc, size_t *size)
{
        struct session  *s = c->session;
        char            *right;
        u_char           fg, bg, attr;
        size_t           rightlen;

        fg = options_get_number(&s->options, "status-right-fg");
        if (fg != 8)
                colour_set_fg(gc, fg);
        bg = options_get_number(&s->options, "status-right-bg");
        if (bg != 8)
                colour_set_bg(gc, bg);
        attr = options_get_number(&s->options, "status-right-attr");
        if (attr != 0)
                gc->attr = attr;

        right = status_replace(
            c, NULL, options_get_string(&s->options, "status-right"), t, 1);

        *size = options_get_number(&s->options, "status-right-length");
        rightlen = screen_write_cstrlen(utf8flag, "%s", right);
        if (rightlen < *size)
                *size = rightlen;
        return (right);
}

/* Draw status for client on the last lines of given context. */
int
status_redraw(struct client *c)
{
        struct screen_write_ctx ctx;
        struct session         *s = c->session;
        struct winlink         *wl;
        struct screen           old_status, window_list;
        struct grid_cell        stdgc, lgc, rgc, gc;
        time_t                  t;
        char                   *left, *right;
        u_int                   offset, needed;
        u_int                   wlstart, wlwidth, wlavailable, wloffset, wlsize;
        size_t                  llen, rlen;
        int                     larrow, rarrow, utf8flag;

        /* No status line? */
        if (c->tty.sy == 0 || !options_get_number(&s->options, "status"))
                return (1);
        left = right = NULL;
        larrow = rarrow = 0;

        /* Update status timer. */
        if (gettimeofday(&c->status_timer, NULL) != 0)
                fatal("gettimeofday failed");
        t = c->status_timer.tv_sec;

        /* Set up default colour. */
        memcpy(&stdgc, &grid_default_cell, sizeof gc);
        colour_set_fg(&stdgc, options_get_number(&s->options, "status-fg"));
        colour_set_bg(&stdgc, options_get_number(&s->options, "status-bg"));
        stdgc.attr |= options_get_number(&s->options, "status-attr");

        /* Create the target screen. */
        memcpy(&old_status, &c->status, sizeof old_status);
        screen_init(&c->status, c->tty.sx, 1, 0);
        screen_write_start(&ctx, NULL, &c->status);
        for (offset = 0; offset < c->tty.sx; offset++)
                screen_write_putc(&ctx, &stdgc, ' ');
        screen_write_stop(&ctx);

        /* If the height is one line, blank status line. */
        if (c->tty.sy <= 1)
                goto out;

        /* Get UTF-8 flag. */
        utf8flag = options_get_number(&s->options, "status-utf8");

        /* Work out left and right strings. */
        memcpy(&lgc, &stdgc, sizeof lgc);
        left = status_redraw_get_left(c, t, utf8flag, &lgc, &llen);
        memcpy(&rgc, &stdgc, sizeof rgc);
        right = status_redraw_get_right(c, t, utf8flag, &rgc, &rlen);

        /*
         * Figure out how much space we have for the window list. If there
         * isn't enough space, just show a blank status line.
         */
        needed = 0;
        if (llen != 0)
                needed += llen + 1;
        if (rlen != 0)
                needed += rlen + 1;
        if (c->tty.sx == 0 || c->tty.sx <= needed)
                goto out;
        wlavailable = c->tty.sx - needed;

        /* Calculate the total size needed for the window list. */
        wlstart = wloffset = wlwidth = 0;
        RB_FOREACH(wl, winlinks, &s->windows) {
                if (wl->status_text != NULL)
                        xfree(wl->status_text);
                memcpy(&wl->status_cell, &stdgc, sizeof wl->status_cell);
                wl->status_text = status_print(c, wl, t, &wl->status_cell);
                wl->status_width =
                    screen_write_cstrlen(utf8flag, "%s", wl->status_text);

                if (wl == s->curw)
                        wloffset = wlwidth;
                wlwidth += wl->status_width + 1;
        }

        /* Create a new screen for the window list. */
        screen_init(&window_list, wlwidth, 1, 0);

        /* And draw the window list into it. */
        screen_write_start(&ctx, NULL, &window_list);
        RB_FOREACH(wl, winlinks, &s->windows) {
                screen_write_cnputs(&ctx,
                    -1, &wl->status_cell, utf8flag, "%s", wl->status_text);
                screen_write_putc(&ctx, &stdgc, ' ');
        }
        screen_write_stop(&ctx);

        /* If there is enough space for the total width, skip to draw now. */
        if (wlwidth <= wlavailable)
                goto draw;

        /* Find size of current window text. */
        wlsize = s->curw->status_width;

        /*
         * If the current window is already on screen, good to draw from the
         * start and just leave off the end.
         */
        if (wloffset + wlsize < wlavailable) {
                if (wlavailable > 0) {
                        rarrow = 1;
                        wlavailable--;
                }
                wlwidth = wlavailable;
        } else {
                /*
                 * Work out how many characters we need to omit from the
                 * start. There are wlavailable characters to fill, and
                 * wloffset + wlsize must be the last. So, the start character
                 * is wloffset + wlsize - wlavailable.
                 */
                if (wlavailable > 0) {
                        larrow = 1;
                        wlavailable--;
                }

                wlstart = wloffset + wlsize - wlavailable;
                if (wlavailable > 0 && wlwidth > wlstart + wlavailable + 1) {
                        rarrow = 1;
                        wlstart++;
                        wlavailable--;
                }
                wlwidth = wlavailable;
        }

        /* Bail if anything is now too small too. */
        if (wlwidth == 0 || wlavailable == 0) {
                screen_free(&window_list);
                goto out;
        }

        /*
         * Now the start position is known, work out the state of the left and
         * right arrows.
         */
        offset = 0;
        RB_FOREACH(wl, winlinks, &s->windows) {
                if (wl->flags & WINLINK_ALERTFLAGS &&
                    larrow == 1 && offset < wlstart)
                        larrow = -1;

                offset += wl->status_width;

                if (wl->flags & WINLINK_ALERTFLAGS &&
                    rarrow == 1 && offset > wlstart + wlwidth)
                        rarrow = -1;
        }

draw:
        /* Begin drawing. */
        screen_write_start(&ctx, NULL, &c->status);

        /* Draw the left string and arrow. */
        screen_write_cursormove(&ctx, 0, 0);
        if (llen != 0) {
                screen_write_cnputs(&ctx, llen, &lgc, utf8flag, "%s", left);
                screen_write_putc(&ctx, &stdgc, ' ');
        }
        if (larrow != 0) {
                memcpy(&gc, &stdgc, sizeof gc);
                if (larrow == -1)
                        gc.attr ^= GRID_ATTR_REVERSE;
                screen_write_putc(&ctx, &gc, '<');
        }

        /* Draw the right string and arrow. */
        if (rarrow != 0) {
                screen_write_cursormove(&ctx, c->tty.sx - rlen - 2, 0);
                memcpy(&gc, &stdgc, sizeof gc);
                if (rarrow == -1)
                        gc.attr ^= GRID_ATTR_REVERSE;
                screen_write_putc(&ctx, &gc, '>');
        } else
                screen_write_cursormove(&ctx, c->tty.sx - rlen - 1, 0);
        if (rlen != 0) {
                screen_write_putc(&ctx, &stdgc, ' ');
                screen_write_cnputs(&ctx, rlen, &rgc, utf8flag, "%s", right);
        }

        /* Figure out the offset for the window list. */
        if (llen != 0)
                wloffset = llen + 1;
        else
                wloffset = 0;
        if (wlwidth < wlavailable) {
                switch (options_get_number(&s->options, "status-justify")) {
                case 1: /* centered */
                        wloffset += (wlavailable - wlwidth) / 2;
                        break;
                case 2: /* right */
                        wloffset += (wlavailable - wlwidth);
                        break;
                }
        }
        if (larrow != 0)
                wloffset++;

        /* Copy the window list. */
        screen_write_cursormove(&ctx, wloffset, 0);
        screen_write_copy(&ctx, &window_list, wlstart, 0, wlwidth, 1);
        screen_free(&window_list);

        screen_write_stop(&ctx);

out:
        if (left != NULL)
                xfree(left);
        if (right != NULL)
                xfree(right);

        if (grid_compare(c->status.grid, old_status.grid) == 0) {
                screen_free(&old_status);
                return (0);
        }
        screen_free(&old_status);
        return (1);
}

/* Replace a single special sequence (prefixed by #). */
void
status_replace1(struct client *c,struct winlink *wl,
    char **iptr, char **optr, char *out, size_t outsize, int jobsflag)
{
        struct session *s = c->session;
        char            ch, tmp[256], *ptr, *endptr, *freeptr;
        size_t          ptrlen;
        long            limit;

        if (wl == NULL)
                wl = s->curw;

        errno = 0;
        limit = strtol(*iptr, &endptr, 10);
        if ((limit == 0 && errno != EINVAL) ||
            (limit == LONG_MIN && errno != ERANGE) ||
            (limit == LONG_MAX && errno != ERANGE) ||
            limit != 0)
                *iptr = endptr;
        if (limit <= 0)
                limit = LONG_MAX;

        freeptr = NULL;

        switch (*(*iptr)++) {
        case '(':
                if (!jobsflag) {
                        ch = ')';
                        goto skip_to;
                }
                if ((ptr = status_job(c, iptr)) == NULL)
                        return;
                freeptr = ptr;
                goto do_replace;
        case 'H':
                if (gethostname(tmp, sizeof tmp) != 0)
                        fatal("gethostname failed");
                ptr = tmp;
                goto do_replace;
        case 'I':
                xsnprintf(tmp, sizeof tmp, "%d", wl->idx);
                ptr = tmp;
                goto do_replace;
        case 'P':
                xsnprintf(tmp, sizeof tmp, "%u",
                    window_pane_index(wl->window, wl->window->active));
                ptr = tmp;
                goto do_replace;
        case 'S':
                ptr = s->name;
                goto do_replace;
        case 'T':
                ptr = wl->window->active->base.title;
                goto do_replace;
        case 'W':
                ptr = wl->window->name;
                goto do_replace;
        case 'F':
                tmp[0] = ' ';
                if (wl->flags & WINLINK_CONTENT)
                        tmp[0] = '+';
                else if (wl->flags & WINLINK_BELL)
                        tmp[0] = '!';
                else if (wl->flags & WINLINK_ACTIVITY)
                        tmp[0] = '#';
                else if (wl == s->curw)
                        tmp[0] = '*';
                else if (wl == TAILQ_FIRST(&s->lastw))
                        tmp[0] = '-';
                tmp[1] = '\0';
                ptr = tmp;
                goto do_replace;
        case '[':
                /*
                 * Embedded style, handled at display time. Leave present and
                 * skip input until ].
                 */
                ch = ']';
                goto skip_to;
        case '#':
                *(*optr)++ = '#';
                break;
        }

        return;

do_replace:
        ptrlen = strlen(ptr);
        if ((size_t) limit < ptrlen)
                ptrlen = limit;

        if (*optr + ptrlen >= out + outsize - 1)
                return;
        while (ptrlen > 0 && *ptr != '\0') {
                *(*optr)++ = *ptr++;
                ptrlen--;
        }

        if (freeptr != NULL)
                xfree(freeptr);
        return;

skip_to:
        *(*optr)++ = '#';

        (*iptr)--;      /* include ch */
        while (**iptr != ch && **iptr != '\0') {
                if (*optr >=  out + outsize - 1)
                        break;
                *(*optr)++ = *(*iptr)++;
        }
}

/* Replace special sequences in fmt. */
char *
status_replace(struct client *c,
    struct winlink *wl, const char *fmt, time_t t, int jobsflag)
{
        static char     out[BUFSIZ];
        char            in[BUFSIZ], ch, *iptr, *optr;

        strftime(in, sizeof in, fmt, localtime(&t));
        in[(sizeof in) - 1] = '\0';

        iptr = in;
        optr = out;

        while (*iptr != '\0') {
                if (optr >= out + (sizeof out) - 1)
                        break;
                ch = *iptr++;

                if (ch != '#') {
                        *optr++ = ch;
                        continue;
                }
                status_replace1(c, wl, &iptr, &optr, out, sizeof out, jobsflag);
        }
        *optr = '\0';

        return (xstrdup(out));
}

/* Figure out job name and get its result, starting it off if necessary. */
char *
status_job(struct client *c, char **iptr)
{
        struct job      *job;
        char            *cmd;
        int              lastesc;
        size_t           len;

        if (**iptr == '\0')
                return (NULL);
        if (**iptr == ')') {            /* no command given */
                (*iptr)++;
                return (NULL);
        }

        cmd = xmalloc(strlen(*iptr) + 1);
        len = 0;

        lastesc = 0;
        for (; **iptr != '\0'; (*iptr)++) {
                if (!lastesc && **iptr == ')')
                        break;          /* unescaped ) is the end */
                if (!lastesc && **iptr == '\\') {
                        lastesc = 1;
                        continue;       /* skip \ if not escaped */
                }
                lastesc = 0;
                cmd[len++] = **iptr;
        }
        if (**iptr == '\0')             /* no terminating ) */ {
                xfree(cmd);
                return (NULL);
        }
        (*iptr)++;                      /* skip final ) */
        cmd[len] = '\0';

        job = job_get(&c->status_jobs, cmd);
        if (job == NULL) {
                job = job_add(&c->status_jobs,
                    JOB_PERSIST, c, cmd, status_job_callback, xfree, NULL);
                job_run(job);
        }
        xfree(cmd);
        if (job->data == NULL)
                return (xstrdup(""));
        return (xstrdup(job->data));
}

/* Job has finished: save its result. */
void
status_job_callback(struct job *job)
{
        char    *line, *buf;
        size_t   len;

        buf = NULL;
        if ((line = evbuffer_readline(job->event->input)) == NULL) {
                len = EVBUFFER_LENGTH(job->event->input);
                buf = xmalloc(len + 1);
                if (len != 0)
                        memcpy(buf, EVBUFFER_DATA(job->event->input), len);
                buf[len] = '\0';
        }

        if (job->data != NULL)
                xfree(job->data);
        else
                server_redraw_client(job->client);

        if (line == NULL)
                job->data = buf;
        else
                job->data = xstrdup(line);
}

/* Return winlink status line entry and adjust gc as necessary. */
char *
status_print(
    struct client *c, struct winlink *wl, time_t t, struct grid_cell *gc)
{
        struct options  *oo = &wl->window->options;
        struct session  *s = c->session;
        const char      *fmt;
        char            *text;
        u_char           fg, bg, attr;

        fg = options_get_number(oo, "window-status-fg");
        if (fg != 8)
                colour_set_fg(gc, fg);
        bg = options_get_number(oo, "window-status-bg");
        if (bg != 8)
                colour_set_bg(gc, bg);
        attr = options_get_number(oo, "window-status-attr");
        if (attr != 0)
                gc->attr = attr;
        fmt = options_get_string(oo, "window-status-format");
        if (wl == s->curw) {
                fg = options_get_number(oo, "window-status-current-fg");
                if (fg != 8)
                        colour_set_fg(gc, fg);
                bg = options_get_number(oo, "window-status-current-bg");
                if (bg != 8)
                        colour_set_bg(gc, bg);
                attr = options_get_number(oo, "window-status-current-attr");
                if (attr != 0)
                        gc->attr = attr;
                fmt = options_get_string(oo, "window-status-current-format");
        }

        if (wl->flags & WINLINK_ALERTFLAGS) {
                fg = options_get_number(oo, "window-status-alert-fg");
                if (fg != 8)
                        colour_set_fg(gc, fg);
                bg = options_get_number(oo, "window-status-alert-bg");
                if (bg != 8)
                        colour_set_bg(gc, bg);
                attr = options_get_number(oo, "window-status-alert-attr");
                if (attr != 0)
                        gc->attr = attr;
        }

        text = status_replace(c, wl, fmt, t, 1);
        return (text);
}

/* Set a status line message. */
void printflike2
status_message_set(struct client *c, const char *fmt, ...)
{
        struct timeval           tv;
        struct session          *s = c->session;
        struct message_entry    *msg;
        va_list                  ap;
        int                      delay;
        u_int                    i, limit;

        status_prompt_clear(c);
        status_message_clear(c);

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

        ARRAY_EXPAND(&c->message_log, 1);
        msg = &ARRAY_LAST(&c->message_log);
        msg->msg_time = time(NULL);
        msg->msg = xstrdup(c->message_string);

        if (s == NULL)
                limit = 0;
        else
                limit = options_get_number(&s->options, "message-limit");
        if (ARRAY_LENGTH(&c->message_log) > limit) {
                limit = ARRAY_LENGTH(&c->message_log) - limit;
                for (i = 0; i < limit; i++) {
                        msg = &ARRAY_FIRST(&c->message_log);
                        xfree(msg->msg);
                        ARRAY_REMOVE(&c->message_log, 0);
                }
        }

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

        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_STATUS;
}

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

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

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

        screen_reinit(&c->status);
}

/* Clear status line message after timer expires. */
/* ARGSUSED */
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 screen_write_ctx         ctx;
        struct session                 *s = c->session;
        struct screen                   old_status;
        size_t                          len;
        struct grid_cell                gc;
        int                             utf8flag;

        if (c->tty.sx == 0 || c->tty.sy == 0)
                return (0);
        memcpy(&old_status, &c->status, sizeof old_status);
        screen_init(&c->status, c->tty.sx, 1, 0);

        utf8flag = options_get_number(&s->options, "status-utf8");

        len = screen_write_strlen(utf8flag, "%s", c->message_string);
        if (len > c->tty.sx)
                len = c->tty.sx;

        memcpy(&gc, &grid_default_cell, sizeof gc);
        colour_set_fg(&gc, options_get_number(&s->options, "message-fg"));
        colour_set_bg(&gc, options_get_number(&s->options, "message-bg"));
        gc.attr |= options_get_number(&s->options, "message-attr");

        screen_write_start(&ctx, NULL, &c->status);

        screen_write_cursormove(&ctx, 0, 0);
        screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->message_string);
        for (; len < c->tty.sx; len++)
                screen_write_putc(&ctx, &gc, ' ');

        screen_write_stop(&ctx);

        if (grid_compare(c->status.grid, old_status.grid) == 0) {
                screen_free(&old_status);
                return (0);
        }
        screen_free(&old_status);
        return (1);
}

/* Enable status line prompt. */
void
status_prompt_set(struct client *c, const char *msg,
    int (*callbackfn)(void *, const char *), void (*freefn)(void *),
    void *data, int flags)
{
        int     keys;

        status_message_clear(c);
        status_prompt_clear(c);

        c->prompt_string = xstrdup(msg);

        c->prompt_buffer = xstrdup("");
        c->prompt_index = 0;

        c->prompt_callbackfn = callbackfn;
        c->prompt_freefn = freefn;
        c->prompt_data = data;

        c->prompt_hindex = 0;

        c->prompt_flags = flags;

        keys = options_get_number(&c->session->options, "status-keys");
        if (keys == MODEKEY_EMACS)
                mode_key_init(&c->prompt_mdata, &mode_key_tree_emacs_edit);
        else
                mode_key_init(&c->prompt_mdata, &mode_key_tree_vi_edit);

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

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

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

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

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

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

        screen_reinit(&c->status);
}

/* Update status line prompt with a new prompt string. */
void
status_prompt_update(struct client *c, const char *msg)
{
        xfree(c->prompt_string);
        c->prompt_string = xstrdup(msg);

        *c->prompt_buffer = '\0';
        c->prompt_index = 0;

        c->prompt_hindex = 0;

        c->flags |= CLIENT_STATUS;
}

/* Draw client prompt on status line of present else on last line. */
int
status_prompt_redraw(struct client *c)
{
        struct screen_write_ctx         ctx;
        struct session                 *s = c->session;
        struct screen                   old_status;
        size_t                          i, size, left, len, off;
        struct grid_cell                gc, *gcp;
        int                             utf8flag;

        if (c->tty.sx == 0 || c->tty.sy == 0)
                return (0);
        memcpy(&old_status, &c->status, sizeof old_status);
        screen_init(&c->status, c->tty.sx, 1, 0);

        utf8flag = options_get_number(&s->options, "status-utf8");

        len = screen_write_strlen(utf8flag, "%s", c->prompt_string);
        if (len > c->tty.sx)
                len = c->tty.sx;
        off = 0;

        memcpy(&gc, &grid_default_cell, sizeof gc);
        colour_set_fg(&gc, options_get_number(&s->options, "message-fg"));
        colour_set_bg(&gc, options_get_number(&s->options, "message-bg"));
        gc.attr |= options_get_number(&s->options, "message-attr");

        screen_write_start(&ctx, NULL, &c->status);

        screen_write_cursormove(&ctx, 0, 0);
        screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->prompt_string);

        left = c->tty.sx - len;
        if (left != 0) {
                size = screen_write_strlen(utf8flag, "%s", c->prompt_buffer);
                if (c->prompt_index >= left) {
                        off = c->prompt_index - left + 1;
                        if (c->prompt_index == size)
                                left--;
                        size = left;
                }
                screen_write_nputs(
                    &ctx, left, &gc, utf8flag, "%s", c->prompt_buffer + off);

                for (i = len + size; i < c->tty.sx; i++)
                        screen_write_putc(&ctx, &gc, ' ');
        }

        screen_write_stop(&ctx);

        /* Apply fake cursor. */
        off = len + c->prompt_index - off;
        gcp = grid_view_get_cell(c->status.grid, off, 0);
        gcp->attr ^= GRID_ATTR_REVERSE;

        if (grid_compare(c->status.grid, old_status.grid) == 0) {
                screen_free(&old_status);
                return (0);
        }
        screen_free(&old_status);
        return (1);
}

/* Handle keys in prompt. */
void
status_prompt_key(struct client *c, int key)
{
        struct paste_buffer     *pb;
        char                    *s, *first, *last, word[64], swapc;
        u_char                   ch;
        size_t                   size, n, off, idx;

        size = strlen(c->prompt_buffer);
        switch (mode_key_lookup(&c->prompt_mdata, key)) {
        case MODEKEYEDIT_CURSORLEFT:
                if (c->prompt_index > 0) {
                        c->prompt_index--;
                        c->flags |= CLIENT_STATUS;
                }
                break;
        case MODEKEYEDIT_SWITCHMODEAPPEND:
        case MODEKEYEDIT_CURSORRIGHT:
                if (c->prompt_index < size) {
                        c->prompt_index++;
                        c->flags |= CLIENT_STATUS;
                }
                break;
        case MODEKEYEDIT_STARTOFLINE:
                if (c->prompt_index != 0) {
                        c->prompt_index = 0;
                        c->flags |= CLIENT_STATUS;
                }
                break;
        case MODEKEYEDIT_ENDOFLINE:
                if (c->prompt_index != size) {
                        c->prompt_index = size;
                        c->flags |= CLIENT_STATUS;
                }
                break;
        case MODEKEYEDIT_COMPLETE:
                if (*c->prompt_buffer == '\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 && *first != ' ')
                        first--;
                while (*first == ' ')
                        first++;
                last = c->prompt_buffer + idx;
                while (*last != '\0' && *last != ' ')
                        last++;
                while (*last == ' ')
                        last--;
                if (*last != '\0')
                        last++;
                if (last <= first ||
                    ((size_t) (last - first)) > (sizeof word) - 1)
                        break;
                memcpy(word, first, last - first);
                word[last - first] = '\0';

                /* And try to complete it. */
                if ((s = status_prompt_complete(word)) == NULL)
                        break;

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

                /* Insert the new word. */
                size += strlen(s);
                off = first - c->prompt_buffer;
                c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 1);
                first = c->prompt_buffer + off;
                memmove(first + strlen(s), first, n);
                memcpy(first, s, strlen(s));

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

                c->flags |= CLIENT_STATUS;
                break;
        case MODEKEYEDIT_BACKSPACE:
                if (c->prompt_index != 0) {
                        if (c->prompt_index == size)
                                c->prompt_buffer[--c->prompt_index] = '\0';
                        else {
                                memmove(c->prompt_buffer + c->prompt_index - 1,
                                    c->prompt_buffer + c->prompt_index,
                                    size + 1 - c->prompt_index);
                                c->prompt_index--;
                        }
                        c->flags |= CLIENT_STATUS;
                }
                break;
        case MODEKEYEDIT_DELETE:
                if (c->prompt_index != size) {
                        memmove(c->prompt_buffer + c->prompt_index,
                            c->prompt_buffer + c->prompt_index + 1,
                            size + 1 - c->prompt_index);
                        c->flags |= CLIENT_STATUS;
                }
                break;
        case MODEKEYEDIT_DELETELINE:
                *c->prompt_buffer = '\0';
                c->prompt_index = 0;
                c->flags |= CLIENT_STATUS;
                break;
        case MODEKEYEDIT_DELETETOENDOFLINE:
                if (c->prompt_index < size) {
                        c->prompt_buffer[c->prompt_index] = '\0';
                        c->flags |= CLIENT_STATUS;
                }
                break;
        case MODEKEYEDIT_HISTORYUP:
                if (ARRAY_LENGTH(&c->prompt_hdata) == 0)
                        break;
                xfree(c->prompt_buffer);

                c->prompt_buffer = xstrdup(ARRAY_ITEM(&c->prompt_hdata,
                    ARRAY_LENGTH(&c->prompt_hdata) - 1 - c->prompt_hindex));
                if (c->prompt_hindex != ARRAY_LENGTH(&c->prompt_hdata) - 1)
                        c->prompt_hindex++;

                c->prompt_index = strlen(c->prompt_buffer);
                c->flags |= CLIENT_STATUS;
                break;
        case MODEKEYEDIT_HISTORYDOWN:
                xfree(c->prompt_buffer);

                if (c->prompt_hindex != 0) {
                        c->prompt_hindex--;
                        c->prompt_buffer = xstrdup(ARRAY_ITEM(
                            &c->prompt_hdata, ARRAY_LENGTH(
                            &c->prompt_hdata) - 1 - c->prompt_hindex));
                } else
                        c->prompt_buffer = xstrdup("");

                c->prompt_index = strlen(c->prompt_buffer);
                c->flags |= CLIENT_STATUS;
                break;
        case MODEKEYEDIT_PASTE:
                if ((pb = paste_get_top(&c->session->buffers)) == NULL)
                        break;
                for (n = 0; n < pb->size; n++) {
                        ch = (u_char) pb->data[n];
                        if (ch < 32 || ch == 127)
                                break;
                }

                c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + n + 1);
                if (c->prompt_index == size) {
                        memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
                        c->prompt_index += n;
                        c->prompt_buffer[c->prompt_index] = '\0';
                } else {
                        memmove(c->prompt_buffer + c->prompt_index + n,
                            c->prompt_buffer + c->prompt_index,
                            size + 1 - c->prompt_index);
                        memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
                        c->prompt_index += n;
                }

                c->flags |= CLIENT_STATUS;
                break;
        case MODEKEYEDIT_TRANSPOSECHARS:
                idx = c->prompt_index;
                if (idx < size)
                        idx++;
                if (idx >= 2) {
                        swapc = c->prompt_buffer[idx - 2];
                        c->prompt_buffer[idx - 2] = c->prompt_buffer[idx - 1];
                        c->prompt_buffer[idx - 1] = swapc;
                        c->prompt_index = idx;
                        c->flags |= CLIENT_STATUS;
                }
                break;
        case MODEKEYEDIT_ENTER:
                if (*c->prompt_buffer != '\0')
                        status_prompt_add_history(c);
                if (c->prompt_callbackfn(c->prompt_data, c->prompt_buffer) == 0)
                        status_prompt_clear(c);
                break;
        case MODEKEYEDIT_CANCEL:
                if (c->prompt_callbackfn(c->prompt_data, NULL) == 0)
                        status_prompt_clear(c);
                break;
        case MODEKEY_OTHER:
                if ((key & 0xff00) != 0 || key < 32 || key == 127)
                        break;
                c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 2);

                if (c->prompt_index == size) {
                        c->prompt_buffer[c->prompt_index++] = key;
                        c->prompt_buffer[c->prompt_index] = '\0';
                } else {
                        memmove(c->prompt_buffer + c->prompt_index + 1,
                            c->prompt_buffer + c->prompt_index,
                            size + 1 - c->prompt_index);
                        c->prompt_buffer[c->prompt_index++] = key;
                }

                if (c->prompt_flags & PROMPT_SINGLE) {
                        if (c->prompt_callbackfn(
                            c->prompt_data, c->prompt_buffer) == 0)
                                status_prompt_clear(c);
                }

                c->flags |= CLIENT_STATUS;
                break;
        default:
                break;
        }
}

/* Add line to the history. */
void
status_prompt_add_history(struct client *c)
{
        if (ARRAY_LENGTH(&c->prompt_hdata) > 0 &&
            strcmp(ARRAY_LAST(&c->prompt_hdata), c->prompt_buffer) == 0)
                return;

        if (ARRAY_LENGTH(&c->prompt_hdata) == PROMPT_HISTORY) {
                xfree(ARRAY_FIRST(&c->prompt_hdata));
                ARRAY_REMOVE(&c->prompt_hdata, 0);
        }

        ARRAY_ADD(&c->prompt_hdata, xstrdup(c->prompt_buffer));
}

/* Complete word. */
char *
status_prompt_complete(const char *s)
{
        const struct cmd_entry        **cmdent;
        const struct set_option_entry  *entry;
        ARRAY_DECL(, const char *)      list;
        char                           *prefix, *s2;
        u_int                           i;
        size_t                          j;

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

        /* First, build a list of all the possible matches. */
        ARRAY_INIT(&list);
        for (cmdent = cmd_table; *cmdent != NULL; cmdent++) {
                if (strncmp((*cmdent)->name, s, strlen(s)) == 0)
                        ARRAY_ADD(&list, (*cmdent)->name);
        }
        for (entry = set_option_table; entry->name != NULL; entry++) {
                if (strncmp(entry->name, s, strlen(s)) == 0)
                        ARRAY_ADD(&list, entry->name);
        }
        for (entry = set_session_option_table; entry->name != NULL; entry++) {
                if (strncmp(entry->name, s, strlen(s)) == 0)
                        ARRAY_ADD(&list, entry->name);
        }
        for (entry = set_window_option_table; entry->name != NULL; entry++) {
                if (strncmp(entry->name, s, strlen(s)) == 0)
                        ARRAY_ADD(&list, entry->name);
        }

        /* If none, bail now. */
        if (ARRAY_LENGTH(&list) == 0) {
                ARRAY_FREE(&list);
                return (NULL);
        }

        /* If an exact match, return it, with a trailing space. */
        if (ARRAY_LENGTH(&list) == 1) {
                xasprintf(&s2, "%s ", ARRAY_FIRST(&list));
                ARRAY_FREE(&list);
                return (s2);
        }

        /* Now loop through the list and find the longest common prefix. */
        prefix = xstrdup(ARRAY_FIRST(&list));
        for (i = 1; i < ARRAY_LENGTH(&list); i++) {
                s = ARRAY_ITEM(&list, i);

                j = strlen(s);
                if (j > strlen(prefix))
                        j = strlen(prefix);
                for (; j > 0; j--) {
                        if (prefix[j - 1] != s[j - 1])
                                prefix[j - 1] = '\0';
                }
        }

        ARRAY_FREE(&list);
        return (prefix);
}