/* $OpenBSD: cmd-split-window.c,v 1.116 2025/04/09 07:03:04 nicm Exp $ */

/*
 * Copyright (c) 2009 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 <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Split a window (add a new pane).
 */

#define SPLIT_WINDOW_TEMPLATE "#{session_name}:#{window_index}.#{pane_index}"

static enum cmd_retval  cmd_split_window_exec(struct cmd *,
                            struct cmdq_item *);

const struct cmd_entry cmd_split_window_entry = {
        .name = "split-window",
        .alias = "splitw",

        .args = { "bc:de:fF:hIl:p:Pt:vZ", 0, -1, NULL },
        .usage = "[-bdefhIPvZ] [-c start-directory] [-e environment] "
                 "[-F format] [-l size] " CMD_TARGET_PANE_USAGE
                 " [shell-command [argument ...]]",

        .target = { 't', CMD_FIND_PANE, 0 },

        .flags = 0,
        .exec = cmd_split_window_exec
};

static enum cmd_retval
cmd_split_window_exec(struct cmd *self, struct cmdq_item *item)
{
        struct args             *args = cmd_get_args(self);
        struct cmd_find_state   *current = cmdq_get_current(item);
        struct cmd_find_state   *target = cmdq_get_target(item);
        struct spawn_context     sc = { 0 };
        struct client           *tc = cmdq_get_target_client(item);
        struct session          *s = target->s;
        struct winlink          *wl = target->wl;
        struct window           *w = wl->window;
        struct window_pane      *wp = target->wp, *new_wp;
        enum layout_type         type;
        struct layout_cell      *lc;
        struct cmd_find_state    fs;
        int                      size, flags, input;
        const char              *template;
        char                    *cause = NULL, *cp;
        struct args_value       *av;
        u_int                    count = args_count(args), curval = 0;

        type = LAYOUT_TOPBOTTOM;
        if (args_has(args, 'h'))
                type = LAYOUT_LEFTRIGHT;

        /* If the 'p' flag is dropped then this bit can be moved into 'l'. */
        if (args_has(args, 'l') || args_has(args, 'p')) {
                if (args_has(args, 'f')) {
                        if (type == LAYOUT_TOPBOTTOM)
                                curval = w->sy;
                        else
                                curval = w->sx;
                } else {
                        if (type == LAYOUT_TOPBOTTOM)
                                curval = wp->sy;
                        else
                                curval = wp->sx;
                }
        }

        size = -1;
        if (args_has(args, 'l')) {
                size = args_percentage_and_expand(args, 'l', 0, INT_MAX, curval,
                    item, &cause);
        } else if (args_has(args, 'p')) {
                size = args_strtonum_and_expand(args, 'p', 0, 100, item,
                    &cause);
                if (cause == NULL)
                        size = curval * size / 100;
        }
        if (cause != NULL) {
                cmdq_error(item, "size %s", cause);
                free(cause);
                return (CMD_RETURN_ERROR);
        }

        window_push_zoom(wp->window, 1, args_has(args, 'Z'));
        input = (args_has(args, 'I') && count == 0);

        flags = 0;
        if (args_has(args, 'b'))
                flags |= SPAWN_BEFORE;
        if (args_has(args, 'f'))
                flags |= SPAWN_FULLSIZE;
        if (input || (count == 1 && *args_string(args, 0) == '\0'))
                flags |= SPAWN_EMPTY;

        lc = layout_split_pane(wp, type, size, flags);
        if (lc == NULL) {
                cmdq_error(item, "no space for new pane");
                return (CMD_RETURN_ERROR);
        }

        sc.item = item;
        sc.s = s;
        sc.wl = wl;

        sc.wp0 = wp;
        sc.lc = lc;

        args_to_vector(args, &sc.argc, &sc.argv);
        sc.environ = environ_create();

        av = args_first_value(args, 'e');
        while (av != NULL) {
                environ_put(sc.environ, av->string, 0);
                av = args_next_value(av);
        }

        sc.idx = -1;
        sc.cwd = args_get(args, 'c');

        sc.flags = flags;
        if (args_has(args, 'd'))
                sc.flags |= SPAWN_DETACHED;
        if (args_has(args, 'Z'))
                sc.flags |= SPAWN_ZOOM;

        if ((new_wp = spawn_pane(&sc, &cause)) == NULL) {
                cmdq_error(item, "create pane failed: %s", cause);
                free(cause);
                if (sc.argv != NULL)
                        cmd_free_argv(sc.argc, sc.argv);
                environ_free(sc.environ);
                return (CMD_RETURN_ERROR);
        }
        if (input) {
                switch (window_pane_start_input(new_wp, item, &cause)) {
                case -1:
                        server_client_remove_pane(new_wp);
                        layout_close_pane(new_wp);
                        window_remove_pane(wp->window, new_wp);
                        cmdq_error(item, "%s", cause);
                        free(cause);
                        if (sc.argv != NULL)
                                cmd_free_argv(sc.argc, sc.argv);
                        environ_free(sc.environ);
                        return (CMD_RETURN_ERROR);
                case 1:
                        input = 0;
                        break;
                }
        }
        if (!args_has(args, 'd'))
                cmd_find_from_winlink_pane(current, wl, new_wp, 0);
        window_pop_zoom(wp->window);
        server_redraw_window(wp->window);
        server_status_session(s);

        if (args_has(args, 'P')) {
                if ((template = args_get(args, 'F')) == NULL)
                        template = SPLIT_WINDOW_TEMPLATE;
                cp = format_single(item, template, tc, s, wl, new_wp);
                cmdq_print(item, "%s", cp);
                free(cp);
        }

        cmd_find_from_winlink_pane(&fs, wl, new_wp, 0);
        cmdq_insert_hook(s, item, &fs, "after-split-window");

        if (sc.argv != NULL)
                cmd_free_argv(sc.argc, sc.argv);
        environ_free(sc.environ);
        if (input)
                return (CMD_RETURN_WAIT);
        return (CMD_RETURN_NORMAL);
}