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Add a command queue to standardize and simplify commands that call other
commands and allow a command to block execution of subsequent
commands. This allows run-shell and if-shell to be synchronous which has
been much requested.

Each client has a default command queue and commands are consumed one at
a time from it. A command may suspend execution from the queue by
returning CMD_RETURN_WAIT and then resume it by calling cmd_continue() -
for example run-shell does this from the callback that is fired after
the job is freed.

When the command queue becomes empty, command clients are automatically
exited (unless attaching). A callback is also fired - this is used for
nested commands in, for example, if-shell which can block execution of
the client's cmdq until a new cmdq becomes empty.

Also merge all the old error/info/print functions together and lose the
old curclient/cmdclient distinction - a cmdq is bound to one client (or
none if in the configuration file), this is a command client if
c->session is NULL otherwise an attached client.

/* $OpenBSD: cmd-rotate-window.c,v 1.13 2013/03/24 09:54:10 nicm Exp $ */

/*
 * Copyright (c) 2009 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"

/*
 * Rotate the panes in a window.
 */

void		 cmd_rotate_window_key_binding(struct cmd *, int);
enum cmd_retval	 cmd_rotate_window_exec(struct cmd *, struct cmd_q *);

const struct cmd_entry cmd_rotate_window_entry = {
	"rotate-window", "rotatew",
	"Dt:U", 0, 0,
	"[-DU] " CMD_TARGET_WINDOW_USAGE,
	0,
	cmd_rotate_window_key_binding,
	NULL,
	cmd_rotate_window_exec
};

void
cmd_rotate_window_key_binding(struct cmd *self, int key)
{
	self->args = args_create(0);
	if (key == ('o' | KEYC_ESCAPE))
		args_set(self->args, 'D', NULL);
}

enum cmd_retval
cmd_rotate_window_exec(struct cmd *self, struct cmd_q *cmdq)
{
	struct args		*args = self->args;
	struct winlink		*wl;
	struct window		*w;
	struct window_pane	*wp, *wp2;
	struct layout_cell	*lc;
	u_int			 sx, sy, xoff, yoff;

	if ((wl = cmd_find_window(cmdq, args_get(args, 't'), NULL)) == NULL)
		return (CMD_RETURN_ERROR);
	w = wl->window;

	if (args_has(self->args, 'D')) {
		wp = TAILQ_LAST(&w->panes, window_panes);
		TAILQ_REMOVE(&w->panes, wp, entry);
		TAILQ_INSERT_HEAD(&w->panes, wp, entry);

		lc = wp->layout_cell;
		xoff = wp->xoff; yoff = wp->yoff;
		sx = wp->sx; sy = wp->sy;
		TAILQ_FOREACH(wp, &w->panes, entry) {
			if ((wp2 = TAILQ_NEXT(wp, entry)) == NULL)
				break;
			wp->layout_cell = wp2->layout_cell;
			if (wp->layout_cell != NULL)
				wp->layout_cell->wp = wp;
			wp->xoff = wp2->xoff; wp->yoff = wp2->yoff;
			window_pane_resize(wp, wp2->sx, wp2->sy);
		}
		wp->layout_cell = lc;
		if (wp->layout_cell != NULL)
			wp->layout_cell->wp = wp;
		wp->xoff = xoff; wp->yoff = yoff;
		window_pane_resize(wp, sx, sy);

		if ((wp = TAILQ_PREV(w->active, window_panes, entry)) == NULL)
			wp = TAILQ_LAST(&w->panes, window_panes);
		window_set_active_pane(w, wp);
		server_redraw_window(w);
	} else {
		wp = TAILQ_FIRST(&w->panes);
		TAILQ_REMOVE(&w->panes, wp, entry);
		TAILQ_INSERT_TAIL(&w->panes, wp, entry);

		lc = wp->layout_cell;
		xoff = wp->xoff; yoff = wp->yoff;
		sx = wp->sx; sy = wp->sy;
		TAILQ_FOREACH_REVERSE(wp, &w->panes, window_panes, entry) {
			if ((wp2 = TAILQ_PREV(wp, window_panes, entry)) == NULL)
				break;
			wp->layout_cell = wp2->layout_cell;
			if (wp->layout_cell != NULL)
				wp->layout_cell->wp = wp;
			wp->xoff = wp2->xoff; wp->yoff = wp2->yoff;
			window_pane_resize(wp, wp2->sx, wp2->sy);
		}
		wp->layout_cell = lc;
		if (wp->layout_cell != NULL)
			wp->layout_cell->wp = wp;
		wp->xoff = xoff; wp->yoff = yoff;
		window_pane_resize(wp, sx, sy);

		if ((wp = TAILQ_NEXT(w->active, entry)) == NULL)
			wp = TAILQ_FIRST(&w->panes);
		window_set_active_pane(w, wp);
		server_redraw_window(w);
	}

	return (CMD_RETURN_NORMAL);
}