/* $OpenBSD$ */

/*
* Copyright (c) 2007 Nicholas Marriott <[email protected]>
*
* 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 <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_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_server_access_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_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_server_access_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 (m->wp == -1)
               wp = wl->window->active;
       else {
               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);
}

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