/* $OpenBSD: cmd-if-shell.c,v 1.86 2025/08/01 09:05:51 nicm Exp $ */

/*
 * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
 * Copyright (c) 2009 Nicholas Marriott <nicm@openbsd.org>
 *
 * 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/wait.h>

#include <ctype.h>
#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * Executes a tmux command if a shell command returns true or false.
 */

static enum args_parse_type     cmd_if_shell_args_parse(struct args *, u_int,
                                    char **);
static enum cmd_retval          cmd_if_shell_exec(struct cmd *,
                                    struct cmdq_item *);

static void     cmd_if_shell_callback(struct job *);
static void     cmd_if_shell_free(void *);

const struct cmd_entry cmd_if_shell_entry = {
        .name = "if-shell",
        .alias = "if",

        .args = { "bFt:", 2, 3, cmd_if_shell_args_parse },
        .usage = "[-bF] " CMD_TARGET_PANE_USAGE " shell-command command "
                 "[command]",

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

        .flags = 0,
        .exec = cmd_if_shell_exec
};

struct cmd_if_shell_data {
        struct args_command_state       *cmd_if;
        struct args_command_state       *cmd_else;

        struct client                   *client;
        struct cmdq_item                *item;
};

static enum args_parse_type
cmd_if_shell_args_parse(__unused struct args *args, u_int idx,
    __unused char **cause)
{
        if (idx == 1 || idx == 2)
                return (ARGS_PARSE_COMMANDS_OR_STRING);
        return (ARGS_PARSE_STRING);
}

static enum cmd_retval
cmd_if_shell_exec(struct cmd *self, struct cmdq_item *item)
{
        struct args                     *args = cmd_get_args(self);
        struct cmd_find_state           *target = cmdq_get_target(item);
        struct cmd_if_shell_data        *cdata;
        struct cmdq_item                *new_item;
        char                            *shellcmd;
        struct client                   *tc = cmdq_get_target_client(item);
        struct session                  *s = target->s;
        struct cmd_list                 *cmdlist;
        u_int                            count = args_count(args);
        int                              wait = !args_has(args, 'b');

        shellcmd = format_single_from_target(item, args_string(args, 0));
        if (args_has(args, 'F')) {
                if (*shellcmd != '0' && *shellcmd != '\0')
                        cmdlist = args_make_commands_now(self, item, 1, 0);
                else if (count == 3)
                        cmdlist = args_make_commands_now(self, item, 2, 0);
                else {
                        free(shellcmd);
                        return (CMD_RETURN_NORMAL);
                }
                free(shellcmd);
                if (cmdlist == NULL)
                        return (CMD_RETURN_ERROR);
                new_item = cmdq_get_command(cmdlist, cmdq_get_state(item));
                cmdq_insert_after(item, new_item);
                return (CMD_RETURN_NORMAL);
        }

        cdata = xcalloc(1, sizeof *cdata);

        cdata->cmd_if = args_make_commands_prepare(self, item, 1, NULL, wait,
            0);
        if (count == 3) {
                cdata->cmd_else = args_make_commands_prepare(self, item, 2,
                    NULL, wait, 0);
        }

        if (wait) {
                cdata->client = cmdq_get_client(item);
                cdata->item = item;
        } else
                cdata->client = tc;
        if (cdata->client != NULL)
                cdata->client->references++;

        if (job_run(shellcmd, 0, NULL, NULL, s,
            server_client_get_cwd(cmdq_get_client(item), s), NULL,
            cmd_if_shell_callback, cmd_if_shell_free, cdata, 0, -1,
            -1) == NULL) {
                cmdq_error(item, "failed to run command: %s", shellcmd);
                free(shellcmd);
                cmd_if_shell_free(cdata);
                return (CMD_RETURN_ERROR);
        }
        free(shellcmd);

        if (!wait)
                return (CMD_RETURN_NORMAL);
        return (CMD_RETURN_WAIT);
}

static void
cmd_if_shell_callback(struct job *job)
{
        struct cmd_if_shell_data        *cdata = job_get_data(job);
        struct client                   *c = cdata->client;
        struct cmdq_item                *item = cdata->item, *new_item;
        struct args_command_state       *state;
        struct cmd_list                 *cmdlist;
        char                            *error;
        int                              status;

        status = job_get_status(job);
        if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
                state = cdata->cmd_else;
        else
                state = cdata->cmd_if;
        if (state == NULL)
                goto out;

        cmdlist = args_make_commands(state, 0, NULL, &error);
        if (cmdlist == NULL) {
                if (cdata->item == NULL) {
                        *error = toupper((u_char)*error);
                        status_message_set(c, -1, 1, 0, 0, "%s", error);
                } else
                        cmdq_error(cdata->item, "%s", error);
                free(error);
        } else if (item == NULL) {
                new_item = cmdq_get_command(cmdlist, NULL);
                cmdq_append(c, new_item);
        } else {
                new_item = cmdq_get_command(cmdlist, cmdq_get_state(item));
                cmdq_insert_after(item, new_item);
        }

out:
        if (cdata->item != NULL)
                cmdq_continue(cdata->item);
}

static void
cmd_if_shell_free(void *data)
{
        struct cmd_if_shell_data        *cdata = data;

        if (cdata->client != NULL)
                server_client_unref(cdata->client);

        if (cdata->cmd_else != NULL)
                args_make_commands_free(cdata->cmd_else);
        args_make_commands_free(cdata->cmd_if);

        free(cdata);
}