/* $OpenBSD$ */

/*
 * 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 <pwd.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.
 */

int	cmd_new_session_parse(struct cmd *, int, char **, char **);
int	cmd_new_session_exec(struct cmd *, struct cmd_ctx *);
void	cmd_new_session_free(struct cmd *);
void	cmd_new_session_init(struct cmd *, int);
size_t	cmd_new_session_print(struct cmd *, char *, size_t);

struct cmd_new_session_data {
	char	*target;
	char	*newname;
	char	*winname;
	char	*cmd;
	int	 flag_detached;
};

const struct cmd_entry cmd_new_session_entry = {
	"new-session", "new",
	"[-d] [-n window-name] [-s session-name] [-t target-session] [command]",
	CMD_STARTSERVER|CMD_CANTNEST|CMD_SENDENVIRON, "",
	cmd_new_session_init,
	cmd_new_session_parse,
	cmd_new_session_exec,
	cmd_new_session_free,
	cmd_new_session_print
};

/* ARGSUSED */
void
cmd_new_session_init(struct cmd *self, unused int arg)
{
	struct cmd_new_session_data	 *data;

	self->data = data = xmalloc(sizeof *data);
	data->flag_detached = 0;
	data->target = NULL;
	data->newname = NULL;
	data->winname = NULL;
	data->cmd = NULL;
}

int
cmd_new_session_parse(struct cmd *self, int argc, char **argv, char **cause)
{
	struct cmd_new_session_data	*data;
	int				 opt;

	self->entry->init(self, KEYC_NONE);
	data = self->data;

	while ((opt = getopt(argc, argv, "ds:t:n:")) != -1) {
		switch (opt) {
		case 'd':
			data->flag_detached = 1;
			break;
		case 's':
			if (data->newname == NULL)
				data->newname = xstrdup(optarg);
			break;
		case 't':
			if (data->target == NULL)
				data->target = xstrdup(optarg);
			break;
		case 'n':
			if (data->winname == NULL)
				data->winname = xstrdup(optarg);
			break;
		default:
			goto usage;
		}
	}
	argc -= optind;
	argv += optind;
	if (argc != 0 && argc != 1)
		goto usage;

	if (data->target != NULL && (argc == 1 || data->winname != NULL))
		goto usage;

	if (argc == 1)
		data->cmd = xstrdup(argv[0]);

	return (0);

usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

	self->entry->free(self);
	return (-1);
}

int
cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_new_session_data	*data = self->data;
	struct session			*s, *old_s, *groupwith;
	struct window			*w;
	struct window_pane		*wp;
	struct environ			 env;
	struct termios			 tio, *tiop;
	struct passwd			*pw;
	const char			*update, *cwd;
	char				*overrides, *cmd, *cause;
	int				 detached, idx;
	u_int				 sx, sy, i;

	if (data->newname != NULL && session_find(data->newname) != NULL) {
		ctx->error(ctx, "duplicate session: %s", data->newname);
		return (-1);
	}

	groupwith = NULL;
	if (data->target != NULL &&
	    (groupwith = cmd_find_session(ctx, data->target)) == NULL)
		return (-1);

	/*
	 * There are three cases:
	 *
	 * 1. If cmdclient is non-NULL, new-session has been called from the
	 *    command-line - cmdclient is to become a new attached, interactive
	 *    client. Unless -d is given, the terminal must be opened and then
	 *    the client sent MSG_READY.
	 *
	 * 2. If cmdclient is NULL, new-session has been called from an
	 *    existing client (such as a key binding).
	 *
	 * 3. Both are NULL, the command was in the configuration file. Treat
	 *    this as if -d was given even if it was not.
	 *
	 * In all cases, a new additional session needs to be created and
	 * (unless -d) set as the current session for the client.
	 */

	/* Set -d if no client. */
	detached = data->flag_detached;
	if (ctx->cmdclient == NULL && ctx->curclient == NULL)
		detached = 1;

	/*
	 * Save the termios settings, part of which is used for new windows in
	 * this session.
	 *
	 * This is read again with tcgetattr() rather than using tty.tio as if
	 * detached, tty_open won't be called. Because of this, it must be done
	 * before opening the terminal as that calls tcsetattr() to prepare for
	 * tmux taking over.
	 */
	if (ctx->cmdclient != NULL && ctx->cmdclient->tty.fd != -1) {
		if (tcgetattr(ctx->cmdclient->tty.fd, &tio) != 0)
			fatal("tcgetattr failed");
		tiop = &tio;
	} else
		tiop = NULL;

	/* Open the terminal if necessary. */
	if (!detached && ctx->cmdclient != NULL) {
		if (!(ctx->cmdclient->flags & CLIENT_TERMINAL)) {
			ctx->error(ctx, "not a terminal");
			return (-1);
		}

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

	/* Get the new session working directory. */
	if (ctx->cmdclient != NULL && ctx->cmdclient->cwd != NULL)
		cwd = ctx->cmdclient->cwd;
	else {
		pw = getpwuid(getuid());
		if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
			cwd = pw->pw_dir;
		else
			cwd = "/";
	}

	/* Find new session size. */
	if (detached) {
		sx = 80;
		sy = 24;
	} else if (ctx->cmdclient != NULL) {
		sx = ctx->cmdclient->tty.sx;
		sy = ctx->cmdclient->tty.sy;
	} else {
		sx = ctx->curclient->tty.sx;
		sy = ctx->curclient->tty.sy;
	}
	if (sy > 0 && options_get_number(&global_s_options, "status"))
		sy--;
	if (sx == 0)
		sx = 1;
	if (sy == 0)
		sy = 1;

	/* Figure out the command for the new window. */
	if (data->target != NULL)
		cmd = NULL;
	else if (data->cmd != NULL)
		cmd = data->cmd;
	else
		cmd = options_get_string(&global_s_options, "default-command");

	/* Construct the environment. */
	environ_init(&env);
	update = options_get_string(&global_s_options, "update-environment");
	if (ctx->cmdclient != NULL)
		environ_update(update, &ctx->cmdclient->environ, &env);

	/* Create the new session. */
	idx = -1 - options_get_number(&global_s_options, "base-index");
	s = session_create(
	    data->newname, cmd, cwd, &env, tiop, idx, sx, sy, &cause);
	if (s == NULL) {
		ctx->error(ctx, "create session failed: %s", cause);
		xfree(cause);
		return (-1);
	}
	environ_free(&env);

	/* Set the initial window name if one given. */
	if (cmd != NULL && data->winname != NULL) {
		w = s->curw->window;

		xfree(w->name);
		w->name = xstrdup(data->winname);

		options_set_number(&w->options, "automatic-rename", 0);
	}

	/*
	 * If a target session is given, this is to be part of a session group,
	 * so add it to the group and synchronize.
	 */
	if (groupwith != NULL) {
		session_group_add(groupwith, s);
		session_group_synchronize_to(s);
		session_select(s, RB_ROOT(&s->windows)->idx);
	}

	/*
	 * 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 (ctx->cmdclient != NULL) {
			server_write_client(ctx->cmdclient, MSG_READY, NULL, 0);

			old_s = ctx->cmdclient->session;
			if (old_s != NULL)
				ctx->cmdclient->last_session = old_s;
			ctx->cmdclient->session = s;
			session_update_activity(s);
			server_redraw_client(ctx->cmdclient);
		} else {
			old_s = ctx->curclient->session;
			if (old_s != NULL)
				ctx->curclient->last_session = old_s;
			ctx->curclient->session = s;
			session_update_activity(s);
			server_redraw_client(ctx->curclient);
		}
	}
	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 && !ARRAY_EMPTY(&cfg_causes)) {
		wp = s->curw->window->active;
		window_pane_set_mode(wp, &window_copy_mode);
		window_copy_init_for_output(wp);
		for (i = 0; i < ARRAY_LENGTH(&cfg_causes); i++) {
			cause = ARRAY_ITEM(&cfg_causes, i);
			window_copy_add(wp, "%s", cause);
			xfree(cause);
		}
		ARRAY_FREE(&cfg_causes);
	}

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

void
cmd_new_session_free(struct cmd *self)
{
	struct cmd_new_session_data	*data = self->data;

	if (data->newname != NULL)
		xfree(data->newname);
	if (data->winname != NULL)
		xfree(data->winname);
	if (data->cmd != NULL)
		xfree(data->cmd);
	xfree(data);
}

size_t
cmd_new_session_print(struct cmd *self, char *buf, size_t len)
{
	struct cmd_new_session_data	*data = self->data;
	size_t				 off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
		return (off);
	if (off < len && data->flag_detached)
		off += xsnprintf(buf + off, len - off, " -d");
	if (off < len && data->winname != NULL)
		off += cmd_prarg(buf + off, len - off, " -n ", data->winname);
	if (off < len && data->newname != NULL)
		off += cmd_prarg(buf + off, len - off, " -s ", data->newname);
	if (off < len && data->target != NULL)
		off += cmd_prarg(buf + off, len - off, " -t ", data->target);
	if (off < len && data->cmd != NULL)
		off += cmd_prarg(buf + off, len - off, " ", data->cmd);
	return (off);
}