cmd-attach-session.c

/* $Id: cmd-attach-session.c,v 1.40 2011/04/06 22:24:00 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * 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 "tmux.h"

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

int cmd_attach_session_exec(struct cmd *, struct cmd_ctx *);

const struct cmd_entry cmd_attach_session_entry = {
    "attach-session", "attach",
    "drt:", 0, 0,
    "[-dr] " CMD_TARGET_SESSION_USAGE,
    CMD_CANTNEST|CMD_STARTSERVER|CMD_SENDENVIRON,
    NULL,
    NULL,
    cmd_attach_session_exec
};

int
cmd_attach_session_exec(struct cmd *self, struct cmd_ctx *ctx)
{
    struct args *args = self->args;
    struct session  *s;
    struct client   *c;
    const char  *update;
    char        *overrides, *cause;
    u_int        i;

    if (RB_EMPTY(&sessions)) {
        ctx->error(ctx, "no sessions");
        return (-1);
    }

    if ((s = cmd_find_session(ctx, args_get(args, 't'), 1)) == NULL)
        return (-1);

    if (ctx->cmdclient == NULL && ctx->curclient == NULL)
        return (0);

    if (ctx->cmdclient == NULL) {
        if (args_has(self->args, 'd')) {
            /*
             * Can't use server_write_session in case attaching to
             * the same session as currently attached to.
             */
            for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
                c = ARRAY_ITEM(&clients, i);
                if (c == NULL || c->session != s)
                    continue;
                if (c == ctx->curclient)
                    continue;
                server_write_client(c, MSG_DETACH, NULL, 0);
            }
        }

        ctx->curclient->session = s;
        session_update_activity(s);
        server_redraw_client(ctx->curclient);
    } else {
        if (!(ctx->cmdclient->flags & CLIENT_CONTROL) &&
            !(ctx->cmdclient->flags & CLIENT_TERMINAL)) {
            ctx->error(ctx, "not a terminal");
            return (-1);
        }


        if (!(ctx->cmdclient->flags & CLIENT_CONTROL)) {
            overrides =
                options_get_string(&s->options, "terminal-overrides");
            if (tty_open(&ctx->cmdclient->tty, overrides, &cause) != 0) {
                ctx->error(ctx, "terminal open failed: %s", cause);
                xfree(cause);
                return (-1);
            }
        }

        if (args_has(self->args, 'r'))
            ctx->cmdclient->flags |= CLIENT_READONLY;

        if (args_has(self->args, 'd'))
            server_write_session(s, MSG_DETACH, NULL, 0);

        ctx->cmdclient->session = s;
        session_update_activity(s);
        server_write_client(ctx->cmdclient, MSG_READY, NULL, 0);

        update = options_get_string(&s->options, "update-environment");
        environ_update(update, &ctx->cmdclient->environ, &s->environ);

        server_redraw_client(ctx->cmdclient);
    }
    recalculate_sizes();
    server_update_socket();

    return (1); /* 1 means don't tell command client to exit */
}