/* $OpenBSD: cmd-attach-session.c,v 1.89 2022/07/06 08:40:52 nicm Exp $ */

/*
 * 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 <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Attach existing session to the current terminal.
 */

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

const struct cmd_entry cmd_attach_session_entry = {
        .name = "attach-session",
        .alias = "attach",

        .args = { "c:dEf:rt:x", 0, 0, NULL },
        .usage = "[-dErx] [-c working-directory] [-f flags] "
                 CMD_TARGET_SESSION_USAGE,

        /* -t is special */

        .flags = CMD_STARTSERVER|CMD_READONLY,
        .exec = cmd_attach_session_exec
};

enum cmd_retval
cmd_attach_session(struct cmdq_item *item, const char *tflag, int dflag,
    int xflag, int rflag, const char *cflag, int Eflag, const char *fflag)
{
        struct cmd_find_state   *current = cmdq_get_current(item);
        struct cmd_find_state    target;
        enum cmd_find_type       type;
        int                      flags;
        struct client           *c = cmdq_get_client(item), *c_loop;
        struct session          *s;
        struct winlink          *wl;
        struct window_pane      *wp;
        char                    *cwd, *cause;
        enum msgtype             msgtype;

        if (RB_EMPTY(&sessions)) {
                cmdq_error(item, "no sessions");
                return (CMD_RETURN_ERROR);
        }

        if (c == NULL)
                return (CMD_RETURN_NORMAL);

        if (server_client_check_nested(c)) {
                cmdq_error(item, "sessions should be nested with care, "
                    "unset $TMUX to force");
                return (CMD_RETURN_ERROR);
        }

        if (tflag != NULL && tflag[strcspn(tflag, ":.")] != '\0') {
                type = CMD_FIND_PANE;
                flags = 0;
        } else {
                type = CMD_FIND_SESSION;
                flags = CMD_FIND_PREFER_UNATTACHED;
        }
        if (cmd_find_target(&target, item, tflag, type, flags) != 0)
                return (CMD_RETURN_ERROR);
        s = target.s;
        wl = target.wl;
        wp = target.wp;

        if (wl != NULL) {
                if (wp != NULL)
                        window_set_active_pane(wp->window, wp, 1);
                session_set_current(s, wl);
                if (wp != NULL)
                        cmd_find_from_winlink_pane(current, wl, wp, 0);
                else
                        cmd_find_from_winlink(current, wl, 0);
        }

        if (cflag != NULL) {
                cwd = format_single(item, cflag, c, s, wl, wp);
                free((void *)s->cwd);
                s->cwd = cwd;
        }
        if (fflag)
                server_client_set_flags(c, fflag);
        if (rflag)
                c->flags |= (CLIENT_READONLY|CLIENT_IGNORESIZE);

        c->last_session = c->session;
        if (c->session != NULL) {
                if (dflag || xflag) {
                        if (xflag)
                                msgtype = MSG_DETACHKILL;
                        else
                                msgtype = MSG_DETACH;
                        TAILQ_FOREACH(c_loop, &clients, entry) {
                                if (c_loop->session != s || c == c_loop)
                                        continue;
                                server_client_detach(c_loop, msgtype);
                        }
                }
                if (!Eflag)
                        environ_update(s->options, c->environ, s->environ);

                server_client_set_session(c, s);
                if (~cmdq_get_flags(item) & CMDQ_STATE_REPEAT)
                        server_client_set_key_table(c, NULL);
        } else {
                if (server_client_open(c, &cause) != 0) {
                        cmdq_error(item, "open terminal failed: %s", cause);
                        free(cause);
                        return (CMD_RETURN_ERROR);
                }

                if (dflag || xflag) {
                        if (xflag)
                                msgtype = MSG_DETACHKILL;
                        else
                                msgtype = MSG_DETACH;
                        TAILQ_FOREACH(c_loop, &clients, entry) {
                                if (c_loop->session != s || c == c_loop)
                                        continue;
                                server_client_detach(c_loop, msgtype);
                        }
                }
                if (!Eflag)
                        environ_update(s->options, c->environ, s->environ);

                server_client_set_session(c, s);
                server_client_set_key_table(c, NULL);

                if (~c->flags & CLIENT_CONTROL)
                        proc_send(c->peer, MSG_READY, -1, NULL, 0);
                notify_client("client-attached", c);
                c->flags |= CLIENT_ATTACHED;
        }

        if (cfg_finished)
                cfg_show_causes(s);

        return (CMD_RETURN_NORMAL);
}

static enum cmd_retval
cmd_attach_session_exec(struct cmd *self, struct cmdq_item *item)
{
        struct args     *args = cmd_get_args(self);

        return (cmd_attach_session(item, args_get(args, 't'),
            args_has(args, 'd'), args_has(args, 'x'), args_has(args, 'r'),
            args_get(args, 'c'), args_has(args, 'E'), args_get(args, 'f')));
}