text: /* $OpenBSD$ */
  
  /*
   * 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 <termios.h>
  #include <unistd.h>
  
  #include "tmux.h"
  
  /*
   * Create a new session and attach to the current terminal unless -d is given.
   */
  
  #define NEW_SESSION_TEMPLATE "#{session_name}:"
  
  static enum cmd_retval	cmd_new_session_exec(struct cmd *, struct cmdq_item *);
  
  const struct cmd_entry cmd_new_session_entry = {
  	.name = "new-session",
  	.alias = "new",
  
  	.args = { "Ac:dDEF:n:Ps:t:x:Xy:", 0, -1 },
  	.usage = "[-AdDEPX] [-c start-directory] [-F format] [-n window-name] "
  		 "[-s session-name] " CMD_TARGET_SESSION_USAGE " [-x width] "
  		 "[-y height] [command]",
  
  	.target = { 't', CMD_FIND_SESSION, CMD_FIND_CANFAIL },
  
  	.flags = CMD_STARTSERVER,
  	.exec = cmd_new_session_exec
  };
  
  const struct cmd_entry cmd_has_session_entry = {
  	.name = "has-session",
  	.alias = "has",
  
  	.args = { "t:", 0, 0 },
  	.usage = CMD_TARGET_SESSION_USAGE,
  
  	.target = { 't', CMD_FIND_SESSION, 0 },
  
  	.flags = 0,
  	.exec = cmd_new_session_exec
  };
  
  static enum cmd_retval
  cmd_new_session_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 client		*c = cmdq_get_client(item);
  	struct session		*s, *as, *groupwith;
  	struct environ		*env;
  	struct options		*oo;
  	struct termios		 tio, *tiop;
  	struct session_group	*sg;
  	const char		*errstr, *template, *group, *prefix, *tmp;
  	char			*cause, *cwd = NULL, *cp, *newname = NULL;
  	int			 detached, already_attached, is_control = 0;
  	u_int			 sx, sy, dsx, dsy;
  	struct spawn_context	 sc;
  	enum cmd_retval		 retval;
  	struct cmd_find_state    fs;
  
  	if (cmd_get_entry(self) == &cmd_has_session_entry) {
  		/*
  		 * cmd_find_target() will fail if the session cannot be found,
  		 * so always return success here.
  		 */
  		return (CMD_RETURN_NORMAL);
  	}
  
  	if (args_has(args, 't') && (args->argc != 0 || args_has(args, 'n'))) {
  		cmdq_error(item, "command or window name given with target");
  		return (CMD_RETURN_ERROR);
  	}
  
  	tmp = args_get(args, 's');
  	if (tmp != NULL) {
  		newname = format_single(item, tmp, c, NULL, NULL, NULL);
  		if (!session_check_name(newname)) {
  			cmdq_error(item, "bad session name: %s", newname);
  			goto fail;
  		}
  	}
  	if (args_has(args, 'A')) {
  		if (newname != NULL)
  			as = session_find(newname);
  		else
  			as = target->s;
  		if (as != NULL) {
  			retval = cmd_attach_session(item, as->name,
  			    args_has(args, 'D'), args_has(args, 'X'), 0, NULL,
  			    args_has(args, 'E'));
  			free(newname);
  			return (retval);
  		}
  	}
  	if (newname != NULL && session_find(newname) != NULL) {
  		cmdq_error(item, "duplicate session: %s", newname);
  		goto fail;
  	}
  
  	/* Is this going to be part of a session group? */
  	group = args_get(args, 't');
  	if (group != NULL) {
  		groupwith = target->s;
  		if (groupwith == NULL) {
  			if (!session_check_name(group)) {
  				cmdq_error(item, "bad group name: %s", group);
  				goto fail;
  			}
  			sg = session_group_find(group);
  		} else
  			sg = session_group_contains(groupwith);
  		if (sg != NULL)
  			prefix = sg->name;
  		else if (groupwith != NULL)
  			prefix = groupwith->name;
  		else
  			prefix = group;
  	} else {
  		groupwith = NULL;
  		sg = NULL;
  		prefix = NULL;
  	}
  
  	/* Set -d if no client. */
  	detached = args_has(args, 'd');
  	if (c == NULL)
  		detached = 1;
  	else if (c->flags & CLIENT_CONTROL)
  		is_control = 1;
  
  	/* Is this client already attached? */
  	already_attached = 0;
  	if (c != NULL && c->session != NULL)
  		already_attached = 1;
  
  	/* Get the new session working directory. */
  	if ((tmp = args_get(args, 'c')) != NULL)
  		cwd = format_single(item, tmp, c, NULL, NULL, NULL);
  	else
  		cwd = xstrdup(server_client_get_cwd(c, NULL));
  
  	/*
  	 * If this is a new client, check for nesting and save the termios
  	 * settings (part of which is used for new windows in this session).
  	 *
  	 * tcgetattr() is used rather than using tty.tio since if the client is
  	 * detached, tty_open won't be called. It must be done before opening
  	 * the terminal as that calls tcsetattr() to prepare for tmux taking
  	 * over.
  	 */
  	if (!detached && !already_attached && c->tty.fd != -1) {
  		if (server_client_check_nested(cmdq_get_client(item))) {
  			cmdq_error(item, "sessions should be nested with care, "
  			    "unset $TMUX to force");
  			goto fail;
  		}
  		if (tcgetattr(c->tty.fd, &tio) != 0)
  			fatal("tcgetattr failed");
  		tiop = &tio;
  	} else
  		tiop = NULL;
  
  	/* Open the terminal if necessary. */
  	if (!detached && !already_attached) {
  		if (server_client_open(c, &cause) != 0) {
  			cmdq_error(item, "open terminal failed: %s", cause);
  			free(cause);
  			goto fail;
  		}
  	}
  
  	/* Get default session size. */
  	if (args_has(args, 'x')) {
  		tmp = args_get(args, 'x');
  		if (strcmp(tmp, "-") == 0) {
  			if (c != NULL)
  				dsx = c->tty.sx;
  			else
  				dsx = 80;
  		} else {
  			dsx = strtonum(tmp, 1, USHRT_MAX, &errstr);
  			if (errstr != NULL) {
  				cmdq_error(item, "width %s", errstr);
  				goto fail;
  			}
  		}
  	} else
  		dsx = 80;
  	if (args_has(args, 'y')) {
  		tmp = args_get(args, 'y');
  		if (strcmp(tmp, "-") == 0) {
  			if (c != NULL)
  				dsy = c->tty.sy;
  			else
  				dsy = 24;
  		} else {
  			dsy = strtonum(tmp, 1, USHRT_MAX, &errstr);
  			if (errstr != NULL) {
  				cmdq_error(item, "height %s", errstr);
  				goto fail;
  			}
  		}
  	} else
  		dsy = 24;
  
  	/* Find new session size. */
  	if (!detached && !is_control) {
  		sx = c->tty.sx;
  		sy = c->tty.sy;
  		if (sy > 0 && options_get_number(global_s_options, "status"))
  			sy--;
  	} else {
  		tmp = options_get_string(global_s_options, "default-size");
  		if (sscanf(tmp, "%ux%u", &sx, &sy) != 2) {
  			sx = dsx;
  			sy = dsy;
  		} else {
  			if (args_has(args, 'x'))
  				sx = dsx;
  			if (args_has(args, 'y'))
  				sy = dsy;
  		}
  	}
  	if (sx == 0)
  		sx = 1;
  	if (sy == 0)
  		sy = 1;
  
  	/* Create the new session. */
  	oo = options_create(global_s_options);
  	if (args_has(args, 'x') || args_has(args, 'y')) {
  		if (!args_has(args, 'x'))
  			dsx = sx;
  		if (!args_has(args, 'y'))
  			dsy = sy;
  		options_set_string(oo, "default-size", 0, "%ux%u", dsx, dsy);
  	}
  	env = environ_create();
  	if (c != NULL && !args_has(args, 'E'))
  		environ_update(global_s_options, c->environ, env);
  	s = session_create(prefix, newname, cwd, env, oo, tiop);
  
  	/* Spawn the initial window. */
  	memset(&sc, 0, sizeof sc);
  	sc.item = item;
  	sc.s = s;
  
  	sc.name = args_get(args, 'n');
  	sc.argc = args->argc;
  	sc.argv = args->argv;
  
  	sc.idx = -1;
  	sc.cwd = args_get(args, 'c');
  
  	sc.flags = 0;
  
  	if (spawn_window(&sc, &cause) == NULL) {
  		session_destroy(s, 0, __func__);
  		cmdq_error(item, "create window failed: %s", cause);
  		free(cause);
  		goto fail;
  	}
  
  	/*
  	 * If a target session is given, this is to be part of a session group,
  	 * so add it to the group and synchronize.
  	 */
  	if (group != NULL) {
  		if (sg == NULL) {
  			if (groupwith != NULL) {
  				sg = session_group_new(groupwith->name);
  				session_group_add(sg, groupwith);
  			} else
  				sg = session_group_new(group);
  		}
  		session_group_add(sg, s);
  		session_group_synchronize_to(s);
  		session_select(s, RB_MIN(winlinks, &s->windows)->idx);
  	}
  	notify_session("session-created", s);
  
  	/*
  	 * Set the client to the new session. If a command client exists, it is
  	 * taking this session and needs to get MSG_READY and stay around.
  	 */
  	if (!detached) {
  		if (!already_attached) {
  			if (~c->flags & CLIENT_CONTROL)
  				proc_send(c->peer, MSG_READY, -1, NULL, 0);
  		} else if (c->session != NULL)
  			c->last_session = c->session;
  		c->session = s;
  		if (~cmdq_get_flags(item) & CMDQ_STATE_REPEAT)
  			server_client_set_key_table(c, NULL);
  		tty_update_client_offset(c);
  		status_timer_start(c);
  		notify_client("client-session-changed", c);
  		session_update_activity(s, NULL);
  		gettimeofday(&s->last_attached_time, NULL);
  		server_redraw_client(c);
  	}
  	recalculate_sizes();
  	server_update_socket();
  
  	/*
  	 * If there are still configuration file errors to display, put the new
  	 * session's current window into more mode and display them now.
  	 */
  	if (cfg_finished)
  		cfg_show_causes(s);
  
  	/* Print if requested. */
  	if (args_has(args, 'P')) {
  		if ((template = args_get(args, 'F')) == NULL)
  			template = NEW_SESSION_TEMPLATE;
  		cp = format_single(item, template, c, s, s->curw, NULL);
  		cmdq_print(item, "%s", cp);
  		free(cp);
  	}
  
  	if (!detached)
  		c->flags |= CLIENT_ATTACHED;
  	if (!args_has(args, 'd'))
  		cmd_find_from_session(current, s, 0);
  
  	cmd_find_from_session(&fs, s, 0);
  	cmdq_insert_hook(s, item, &fs, "after-new-session");
  
  	free(cwd);
  	free(newname);
  	return (CMD_RETURN_NORMAL);
  
  fail:
  	free(cwd);
  	free(newname);
  	return (CMD_RETURN_ERROR);
  }
  