Add an option (scroll-on-clear) to control if tmux scrolls into history

[tmux.git] / cmd.c

/* $OpenBSD$ */

/*
 * 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 <fnmatch.h>
#include <paths.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

extern const struct cmd_entry cmd_attach_session_entry;
extern const struct cmd_entry cmd_bind_key_entry;
extern const struct cmd_entry cmd_break_pane_entry;
extern const struct cmd_entry cmd_capture_pane_entry;
extern const struct cmd_entry cmd_choose_buffer_entry;
extern const struct cmd_entry cmd_choose_client_entry;
extern const struct cmd_entry cmd_choose_tree_entry;
extern const struct cmd_entry cmd_clear_history_entry;
extern const struct cmd_entry cmd_clear_prompt_history_entry;
extern const struct cmd_entry cmd_clock_mode_entry;
extern const struct cmd_entry cmd_command_prompt_entry;
extern const struct cmd_entry cmd_confirm_before_entry;
extern const struct cmd_entry cmd_copy_mode_entry;
extern const struct cmd_entry cmd_customize_mode_entry;
extern const struct cmd_entry cmd_delete_buffer_entry;
extern const struct cmd_entry cmd_detach_client_entry;
extern const struct cmd_entry cmd_display_menu_entry;
extern const struct cmd_entry cmd_display_message_entry;
extern const struct cmd_entry cmd_display_popup_entry;
extern const struct cmd_entry cmd_display_panes_entry;
extern const struct cmd_entry cmd_down_pane_entry;
extern const struct cmd_entry cmd_find_window_entry;
extern const struct cmd_entry cmd_has_session_entry;
extern const struct cmd_entry cmd_if_shell_entry;
extern const struct cmd_entry cmd_join_pane_entry;
extern const struct cmd_entry cmd_kill_pane_entry;
extern const struct cmd_entry cmd_kill_server_entry;
extern const struct cmd_entry cmd_kill_session_entry;
extern const struct cmd_entry cmd_kill_window_entry;
extern const struct cmd_entry cmd_last_pane_entry;
extern const struct cmd_entry cmd_last_window_entry;
extern const struct cmd_entry cmd_link_window_entry;
extern const struct cmd_entry cmd_list_buffers_entry;
extern const struct cmd_entry cmd_list_clients_entry;
extern const struct cmd_entry cmd_list_commands_entry;
extern const struct cmd_entry cmd_list_keys_entry;
extern const struct cmd_entry cmd_list_panes_entry;
extern const struct cmd_entry cmd_list_sessions_entry;
extern const struct cmd_entry cmd_list_windows_entry;
extern const struct cmd_entry cmd_load_buffer_entry;
extern const struct cmd_entry cmd_lock_client_entry;
extern const struct cmd_entry cmd_lock_server_entry;
extern const struct cmd_entry cmd_lock_session_entry;
extern const struct cmd_entry cmd_move_pane_entry;
extern const struct cmd_entry cmd_move_window_entry;
extern const struct cmd_entry cmd_new_session_entry;
extern const struct cmd_entry cmd_new_window_entry;
extern const struct cmd_entry cmd_next_layout_entry;
extern const struct cmd_entry cmd_next_window_entry;
extern const struct cmd_entry cmd_paste_buffer_entry;
extern const struct cmd_entry cmd_pipe_pane_entry;
extern const struct cmd_entry cmd_previous_layout_entry;
extern const struct cmd_entry cmd_previous_window_entry;
extern const struct cmd_entry cmd_refresh_client_entry;
extern const struct cmd_entry cmd_rename_session_entry;
extern const struct cmd_entry cmd_rename_window_entry;
extern const struct cmd_entry cmd_resize_pane_entry;
extern const struct cmd_entry cmd_resize_window_entry;
extern const struct cmd_entry cmd_respawn_pane_entry;
extern const struct cmd_entry cmd_respawn_window_entry;
extern const struct cmd_entry cmd_rotate_window_entry;
extern const struct cmd_entry cmd_run_shell_entry;
extern const struct cmd_entry cmd_save_buffer_entry;
extern const struct cmd_entry cmd_select_layout_entry;
extern const struct cmd_entry cmd_select_pane_entry;
extern const struct cmd_entry cmd_select_window_entry;
extern const struct cmd_entry cmd_send_keys_entry;
extern const struct cmd_entry cmd_send_prefix_entry;
extern const struct cmd_entry cmd_set_buffer_entry;
extern const struct cmd_entry cmd_set_environment_entry;
extern const struct cmd_entry cmd_set_hook_entry;
extern const struct cmd_entry cmd_set_option_entry;
extern const struct cmd_entry cmd_set_window_option_entry;
extern const struct cmd_entry cmd_show_buffer_entry;
extern const struct cmd_entry cmd_show_environment_entry;
extern const struct cmd_entry cmd_show_hooks_entry;
extern const struct cmd_entry cmd_show_messages_entry;
extern const struct cmd_entry cmd_show_options_entry;
extern const struct cmd_entry cmd_show_prompt_history_entry;
extern const struct cmd_entry cmd_show_window_options_entry;
extern const struct cmd_entry cmd_source_file_entry;
extern const struct cmd_entry cmd_split_window_entry;
extern const struct cmd_entry cmd_start_server_entry;
extern const struct cmd_entry cmd_suspend_client_entry;
extern const struct cmd_entry cmd_swap_pane_entry;
extern const struct cmd_entry cmd_swap_window_entry;
extern const struct cmd_entry cmd_switch_client_entry;
extern const struct cmd_entry cmd_unbind_key_entry;
extern const struct cmd_entry cmd_unlink_window_entry;
extern const struct cmd_entry cmd_up_pane_entry;
extern const struct cmd_entry cmd_wait_for_entry;

const struct cmd_entry *cmd_table[] = {
        &cmd_attach_session_entry,
        &cmd_bind_key_entry,
        &cmd_break_pane_entry,
        &cmd_capture_pane_entry,
        &cmd_choose_buffer_entry,
        &cmd_choose_client_entry,
        &cmd_choose_tree_entry,
        &cmd_clear_history_entry,
        &cmd_clear_prompt_history_entry,
        &cmd_clock_mode_entry,
        &cmd_command_prompt_entry,
        &cmd_confirm_before_entry,
        &cmd_copy_mode_entry,
        &cmd_customize_mode_entry,
        &cmd_delete_buffer_entry,
        &cmd_detach_client_entry,
        &cmd_display_menu_entry,
        &cmd_display_message_entry,
        &cmd_display_popup_entry,
        &cmd_display_panes_entry,
        &cmd_find_window_entry,
        &cmd_has_session_entry,
        &cmd_if_shell_entry,
        &cmd_join_pane_entry,
        &cmd_kill_pane_entry,
        &cmd_kill_server_entry,
        &cmd_kill_session_entry,
        &cmd_kill_window_entry,
        &cmd_last_pane_entry,
        &cmd_last_window_entry,
        &cmd_link_window_entry,
        &cmd_list_buffers_entry,
        &cmd_list_clients_entry,
        &cmd_list_commands_entry,
        &cmd_list_keys_entry,
        &cmd_list_panes_entry,
        &cmd_list_sessions_entry,
        &cmd_list_windows_entry,
        &cmd_load_buffer_entry,
        &cmd_lock_client_entry,
        &cmd_lock_server_entry,
        &cmd_lock_session_entry,
        &cmd_move_pane_entry,
        &cmd_move_window_entry,
        &cmd_new_session_entry,
        &cmd_new_window_entry,
        &cmd_next_layout_entry,
        &cmd_next_window_entry,
        &cmd_paste_buffer_entry,
        &cmd_pipe_pane_entry,
        &cmd_previous_layout_entry,
        &cmd_previous_window_entry,
        &cmd_refresh_client_entry,
        &cmd_rename_session_entry,
        &cmd_rename_window_entry,
        &cmd_resize_pane_entry,
        &cmd_resize_window_entry,
        &cmd_respawn_pane_entry,
        &cmd_respawn_window_entry,
        &cmd_rotate_window_entry,
        &cmd_run_shell_entry,
        &cmd_save_buffer_entry,
        &cmd_select_layout_entry,
        &cmd_select_pane_entry,
        &cmd_select_window_entry,
        &cmd_send_keys_entry,
        &cmd_send_prefix_entry,
        &cmd_set_buffer_entry,
        &cmd_set_environment_entry,
        &cmd_set_hook_entry,
        &cmd_set_option_entry,
        &cmd_set_window_option_entry,
        &cmd_show_buffer_entry,
        &cmd_show_environment_entry,
        &cmd_show_hooks_entry,
        &cmd_show_messages_entry,
        &cmd_show_options_entry,
        &cmd_show_prompt_history_entry,
        &cmd_show_window_options_entry,
        &cmd_source_file_entry,
        &cmd_split_window_entry,
        &cmd_start_server_entry,
        &cmd_suspend_client_entry,
        &cmd_swap_pane_entry,
        &cmd_swap_window_entry,
        &cmd_switch_client_entry,
        &cmd_unbind_key_entry,
        &cmd_unlink_window_entry,
        &cmd_wait_for_entry,
        NULL
};

/* Instance of a command. */
struct cmd {
        const struct cmd_entry   *entry;
        struct args              *args;
        u_int                     group;

        char                     *file;
        u_int                     line;

        TAILQ_ENTRY(cmd)          qentry;
};
TAILQ_HEAD(cmds, cmd);

/* Next group number for new command list. */
static u_int cmd_list_next_group = 1;

/* Log an argument vector. */
void printflike(3, 4)
cmd_log_argv(int argc, char **argv, const char *fmt, ...)
{
        char    *prefix;
        va_list  ap;
        int      i;

        va_start(ap, fmt);
        xvasprintf(&prefix, fmt, ap);
        va_end(ap);

        for (i = 0; i < argc; i++)
                log_debug("%s: argv[%d]=%s", prefix, i, argv[i]);
        free(prefix);
}

/* Prepend to an argument vector. */
void
cmd_prepend_argv(int *argc, char ***argv, const char *arg)
{
        char    **new_argv;
        int       i;

        new_argv = xreallocarray(NULL, (*argc) + 1, sizeof *new_argv);
        new_argv[0] = xstrdup(arg);
        for (i = 0; i < *argc; i++)
                new_argv[1 + i] = (*argv)[i];

        free(*argv);
        *argv = new_argv;
        (*argc)++;
}

/* Append to an argument vector. */
void
cmd_append_argv(int *argc, char ***argv, const char *arg)
{
        *argv = xreallocarray(*argv, (*argc) + 1, sizeof **argv);
        (*argv)[(*argc)++] = xstrdup(arg);
}

/* Pack an argument vector up into a buffer. */
int
cmd_pack_argv(int argc, char **argv, char *buf, size_t len)
{
        size_t  arglen;
        int     i;

        if (argc == 0)
                return (0);
        cmd_log_argv(argc, argv, "%s", __func__);

        *buf = '\0';
        for (i = 0; i < argc; i++) {
                if (strlcpy(buf, argv[i], len) >= len)
                        return (-1);
                arglen = strlen(argv[i]) + 1;
                buf += arglen;
                len -= arglen;
        }

        return (0);
}

/* Unpack an argument vector from a packed buffer. */
int
cmd_unpack_argv(char *buf, size_t len, int argc, char ***argv)
{
        int     i;
        size_t  arglen;

        if (argc == 0)
                return (0);
        *argv = xcalloc(argc, sizeof **argv);

        buf[len - 1] = '\0';
        for (i = 0; i < argc; i++) {
                if (len == 0) {
                        cmd_free_argv(argc, *argv);
                        return (-1);
                }

                arglen = strlen(buf) + 1;
                (*argv)[i] = xstrdup(buf);

                buf += arglen;
                len -= arglen;
        }
        cmd_log_argv(argc, *argv, "%s", __func__);

        return (0);
}

/* Copy an argument vector, ensuring it is terminated by NULL. */
char **
cmd_copy_argv(int argc, char **argv)
{
        char    **new_argv;
        int       i;

        if (argc == 0)
                return (NULL);
        new_argv = xcalloc(argc + 1, sizeof *new_argv);
        for (i = 0; i < argc; i++) {
                if (argv[i] != NULL)
                        new_argv[i] = xstrdup(argv[i]);
        }
        return (new_argv);
}

/* Free an argument vector. */
void
cmd_free_argv(int argc, char **argv)
{
        int     i;

        if (argc == 0)
                return;
        for (i = 0; i < argc; i++)
                free(argv[i]);
        free(argv);
}

/* Convert argument vector to a string. */
char *
cmd_stringify_argv(int argc, char **argv)
{
        char    *buf = NULL, *s;
        size_t   len = 0;
        int      i;

        if (argc == 0)
                return (xstrdup(""));

        for (i = 0; i < argc; i++) {
                s = args_escape(argv[i]);
                log_debug("%s: %u %s = %s", __func__, i, argv[i], s);

                len += strlen(s) + 1;
                buf = xrealloc(buf, len);

                if (i == 0)
                        *buf = '\0';
                else
                        strlcat(buf, " ", len);
                strlcat(buf, s, len);

                free(s);
        }
        return (buf);
}

/* Get entry for command. */
const struct cmd_entry *
cmd_get_entry(struct cmd *cmd)
{
        return (cmd->entry);
}

/* Get arguments for command. */
struct args *
cmd_get_args(struct cmd *cmd)
{
        return (cmd->args);
}

/* Get group for command. */
u_int
cmd_get_group(struct cmd *cmd)
{
        return (cmd->group);
}

/* Get file and line for command. */
void
cmd_get_source(struct cmd *cmd, const char **file, u_int *line)
{
        if (file != NULL)
                *file = cmd->file;
        if (line != NULL)
                *line = cmd->line;
}

/* Look for an alias for a command. */
char *
cmd_get_alias(const char *name)
{
        struct options_entry            *o;
        struct options_array_item       *a;
        union options_value             *ov;
        size_t                           wanted, n;
        const char                      *equals;

        o = options_get_only(global_options, "command-alias");
        if (o == NULL)
                return (NULL);
        wanted = strlen(name);

        a = options_array_first(o);
        while (a != NULL) {
                ov = options_array_item_value(a);

                equals = strchr(ov->string, '=');
                if (equals != NULL) {
                        n = equals - ov->string;
                        if (n == wanted && strncmp(name, ov->string, n) == 0)
                                return (xstrdup(equals + 1));
                }

                a = options_array_next(a);
        }
        return (NULL);
}

/* Look up a command entry by name. */
static const struct cmd_entry *
cmd_find(const char *name, char **cause)
{
        const struct cmd_entry  **loop, *entry, *found = NULL;
        int                       ambiguous;
        char                      s[8192];

        ambiguous = 0;
        for (loop = cmd_table; *loop != NULL; loop++) {
                entry = *loop;
                if (entry->alias != NULL && strcmp(entry->alias, name) == 0) {
                        ambiguous = 0;
                        found = entry;
                        break;
                }

                if (strncmp(entry->name, name, strlen(name)) != 0)
                        continue;
                if (found != NULL)
                        ambiguous = 1;
                found = entry;

                if (strcmp(entry->name, name) == 0)
                        break;
        }
        if (ambiguous)
                goto ambiguous;
        if (found == NULL) {
                xasprintf(cause, "unknown command: %s", name);
                return (NULL);
        }
        return (found);

ambiguous:
        *s = '\0';
        for (loop = cmd_table; *loop != NULL; loop++) {
                entry = *loop;
                if (strncmp(entry->name, name, strlen(name)) != 0)
                        continue;
                if (strlcat(s, entry->name, sizeof s) >= sizeof s)
                        break;
                if (strlcat(s, ", ", sizeof s) >= sizeof s)
                        break;
        }
        s[strlen(s) - 2] = '\0';
        xasprintf(cause, "ambiguous command: %s, could be: %s", name, s);
        return (NULL);
}

/* Parse a single command from an argument vector. */
struct cmd *
cmd_parse(struct args_value *values, u_int count, const char *file, u_int line,
    char **cause)
{
        const struct cmd_entry  *entry;
        struct cmd              *cmd;
        struct args             *args;
        char                    *error = NULL;

        if (count == 0 || values[0].type != ARGS_STRING) {
                xasprintf(cause, "no command");
                return (NULL);
        }
        entry = cmd_find(values[0].string, cause);
        if (entry == NULL)
                return (NULL);

        args = args_parse(&entry->args, values, count, &error);
        if (args == NULL && error == NULL) {
                xasprintf(cause, "usage: %s %s", entry->name, entry->usage);
                return (NULL);
        }
        if (args == NULL) {
                xasprintf(cause, "command %s: %s", entry->name, error);
                free(error);
                return (NULL);
        }

        cmd = xcalloc(1, sizeof *cmd);
        cmd->entry = entry;
        cmd->args = args;

        if (file != NULL)
                cmd->file = xstrdup(file);
        cmd->line = line;

        return (cmd);
}

/* Free a command. */
void
cmd_free(struct cmd *cmd)
{
        free(cmd->file);

        args_free(cmd->args);
        free(cmd);
}

/* Copy a command. */
struct cmd *
cmd_copy(struct cmd *cmd, int argc, char **argv)
{
        struct cmd      *new_cmd;

        new_cmd = xcalloc(1, sizeof *new_cmd);
        new_cmd->entry = cmd->entry;
        new_cmd->args = args_copy(cmd->args, argc, argv);

        if (cmd->file != NULL)
                new_cmd->file = xstrdup(cmd->file);
        new_cmd->line = cmd->line;

        return (new_cmd);
}

/* Get a command as a string. */
char *
cmd_print(struct cmd *cmd)
{
        char    *out, *s;

        s = args_print(cmd->args);
        if (*s != '\0')
                xasprintf(&out, "%s %s", cmd->entry->name, s);
        else
                out = xstrdup(cmd->entry->name);
        free(s);

        return (out);
}

/* Create a new command list. */
struct cmd_list *
cmd_list_new(void)
{
        struct cmd_list *cmdlist;

        cmdlist = xcalloc(1, sizeof *cmdlist);
        cmdlist->references = 1;
        cmdlist->group = cmd_list_next_group++;
        cmdlist->list = xcalloc(1, sizeof *cmdlist->list);
        TAILQ_INIT(cmdlist->list);
        return (cmdlist);
}

/* Append a command to a command list. */
void
cmd_list_append(struct cmd_list *cmdlist, struct cmd *cmd)
{
        cmd->group = cmdlist->group;
        TAILQ_INSERT_TAIL(cmdlist->list, cmd, qentry);
}

/* Append all commands from one list to another.  */
void
cmd_list_append_all(struct cmd_list *cmdlist, struct cmd_list *from)
{
        struct cmd      *cmd;

        TAILQ_FOREACH(cmd, from->list, qentry)
                cmd->group = cmdlist->group;
        TAILQ_CONCAT(cmdlist->list, from->list, qentry);
}

/* Move all commands from one command list to another. */
void
cmd_list_move(struct cmd_list *cmdlist, struct cmd_list *from)
{
        TAILQ_CONCAT(cmdlist->list, from->list, qentry);
        cmdlist->group = cmd_list_next_group++;
}

/* Free a command list. */
void
cmd_list_free(struct cmd_list *cmdlist)
{
        struct cmd      *cmd, *cmd1;

        if (--cmdlist->references != 0)
                return;

        TAILQ_FOREACH_SAFE(cmd, cmdlist->list, qentry, cmd1) {
                TAILQ_REMOVE(cmdlist->list, cmd, qentry);
                cmd_free(cmd);
        }
        free(cmdlist->list);
        free(cmdlist);
}

/* Copy a command list, expanding %s in arguments. */
struct cmd_list *
cmd_list_copy(struct cmd_list *cmdlist, int argc, char **argv)
{
        struct cmd      *cmd;
        struct cmd_list *new_cmdlist;
        struct cmd      *new_cmd;
        u_int            group = cmdlist->group;
        char            *s;

        s = cmd_list_print(cmdlist, 0);
        log_debug("%s: %s", __func__, s);
        free(s);

        new_cmdlist = cmd_list_new();
        TAILQ_FOREACH(cmd, cmdlist->list, qentry) {
                if (cmd->group != group) {
                        new_cmdlist->group = cmd_list_next_group++;
                        group = cmd->group;
                }
                new_cmd = cmd_copy(cmd, argc, argv);
                cmd_list_append(new_cmdlist, new_cmd);
        }

        s = cmd_list_print(new_cmdlist, 0);
        log_debug("%s: %s", __func__, s);
        free(s);

        return (new_cmdlist);
}

/* Get a command list as a string. */
char *
cmd_list_print(struct cmd_list *cmdlist, int escaped)
{
        struct cmd      *cmd, *next;
        char            *buf, *this;
        size_t           len;

        len = 1;
        buf = xcalloc(1, len);

        TAILQ_FOREACH(cmd, cmdlist->list, qentry) {
                this = cmd_print(cmd);

                len += strlen(this) + 6;
                buf = xrealloc(buf, len);

                strlcat(buf, this, len);

                next = TAILQ_NEXT(cmd, qentry);
                if (next != NULL) {
                        if (cmd->group != next->group) {
                                if (escaped)
                                        strlcat(buf, " \\;\\; ", len);
                                else
                                        strlcat(buf, " ;; ", len);
                        } else {
                                if (escaped)
                                        strlcat(buf, " \\; ", len);
                                else
                                        strlcat(buf, " ; ", len);
                        }
                }

                free(this);
        }

        return (buf);
}

/* Get first command in list. */
struct cmd *
cmd_list_first(struct cmd_list *cmdlist)
{
        return (TAILQ_FIRST(cmdlist->list));
}

/* Get next command in list. */
struct cmd *
cmd_list_next(struct cmd *cmd)
{
        return (TAILQ_NEXT(cmd, qentry));
}

/* Do all of the commands in this command list have this flag? */
int
cmd_list_all_have(struct cmd_list *cmdlist, int flag)
{
        struct cmd      *cmd;

        TAILQ_FOREACH(cmd, cmdlist->list, qentry) {
                if (~cmd->entry->flags & flag)
                        return (0);
        }
        return (1);
}

/* Do any of the commands in this command list have this flag? */
int
cmd_list_any_have(struct cmd_list *cmdlist, int flag)
{
        struct cmd      *cmd;

        TAILQ_FOREACH(cmd, cmdlist->list, qentry) {
                if (cmd->entry->flags & flag)
                        return (1);
        }
        return (0);
}

/* Adjust current mouse position for a pane. */
int
cmd_mouse_at(struct window_pane *wp, struct mouse_event *m, u_int *xp,
    u_int *yp, int last)
{
        u_int   x, y;

        if (last) {
                x = m->lx + m->ox;
                y = m->ly + m->oy;
        } else {
                x = m->x + m->ox;
                y = m->y + m->oy;
        }
        log_debug("%s: x=%u, y=%u%s", __func__, x, y, last ? " (last)" : "");

        if (m->statusat == 0 && y >= m->statuslines)
                y -= m->statuslines;

        if (x < wp->xoff || x >= wp->xoff + wp->sx)
                return (-1);
        if (y < wp->yoff || y >= wp->yoff + wp->sy)
                return (-1);

        if (xp != NULL)
                *xp = x - wp->xoff;
        if (yp != NULL)
                *yp = y - wp->yoff;
        return (0);
}

/* Get current mouse window if any. */
struct winlink *
cmd_mouse_window(struct mouse_event *m, struct session **sp)
{
        struct session  *s;
        struct window   *w;
        struct winlink  *wl;

        if (!m->valid)
                return (NULL);
        if (m->s == -1 || (s = session_find_by_id(m->s)) == NULL)
                return (NULL);
        if (m->w == -1)
                wl = s->curw;
        else {
                if ((w = window_find_by_id(m->w)) == NULL)
                        return (NULL);
                wl = winlink_find_by_window(&s->windows, w);
        }
        if (sp != NULL)
                *sp = s;
        return (wl);
}

/* Get current mouse pane if any. */
struct window_pane *
cmd_mouse_pane(struct mouse_event *m, struct session **sp,
    struct winlink **wlp)
{
        struct winlink          *wl;
        struct window_pane      *wp;

        if ((wl = cmd_mouse_window(m, sp)) == NULL)
                return (NULL);
        if ((wp = window_pane_find_by_id(m->wp)) == NULL)
                return (NULL);
        if (!window_has_pane(wl->window, wp))
                return (NULL);

        if (wlp != NULL)
                *wlp = wl;
        return (wp);
}

/* Replace the first %% or %idx in template by s. */
char *
cmd_template_replace(const char *template, const char *s, int idx)
{
        char             ch, *buf;
        const char      *ptr, *cp, quote[] = "\"\\$;~";
        int              replaced, quoted;
        size_t           len;

        if (strchr(template, '%') == NULL)
                return (xstrdup(template));

        buf = xmalloc(1);
        *buf = '\0';
        len = 0;
        replaced = 0;

        ptr = template;
        while (*ptr != '\0') {
                switch (ch = *ptr++) {
                case '%':
                        if (*ptr < '1' || *ptr > '9' || *ptr - '0' != idx) {
                                if (*ptr != '%' || replaced)
                                        break;
                                replaced = 1;
                        }
                        ptr++;

                        quoted = (*ptr == '%');
                        if (quoted)
                                ptr++;

                        buf = xrealloc(buf, len + (strlen(s) * 3) + 1);
                        for (cp = s; *cp != '\0'; cp++) {
                                if (quoted && strchr(quote, *cp) != NULL)
                                        buf[len++] = '\\';
                                buf[len++] = *cp;
                        }
                        buf[len] = '\0';
                        continue;
                }
                buf = xrealloc(buf, len + 2);
                buf[len++] = ch;
                buf[len] = '\0';
        }

        return (buf);
}