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Improved layout code.

Each window now has a tree of layout cells associated with it. In this tree,
each node is either a horizontal or vertical cell containing a list of other
cells running from left-to-right or top-to-bottom, or a leaf cell which is
associated with a pane.

The major functional changes are:

- panes may now be split arbitrarily both horizontally (splitw -h, C-b %) and
  vertically (splitw -v, C-b ");
- panes may be resized both horizontally and vertically (resizep -L/-R/-U/-D,
  bound to C-b left/right/up/down and C-b M-left/right/up/down);
- layouts are now applied and then may be modified by resizing or splitting
  panes, rather than being fixed and reapplied when the window is resized or
  panes are added;
- manual-vertical layout is no longer necessary, and active-only layout is gone
  (but may return in future);
- the main-pane layouts now reduce the size of the main pane to fit all panes
  if possible.

Thanks to all who tested.

/* $OpenBSD: cmd-list-windows.c,v 1.3 2009/07/19 13:21:40 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 <unistd.h>

#include "tmux.h"

/*
 * List windows on given session.
 */

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

const struct cmd_entry cmd_list_windows_entry = {
	"list-windows", "lsw",
	CMD_TARGET_SESSION_USAGE,
	0, 0,
	cmd_target_init,
	cmd_target_parse,
	cmd_list_windows_exec,
	cmd_target_send,
	cmd_target_recv,
	cmd_target_free,
	cmd_target_print
};

int
cmd_list_windows_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_target_data	*data = self->data;
	struct session		*s;
	struct winlink		*wl;
	struct window		*w;
	struct window_pane	*wp;
	struct grid		*gd;
	u_int			 i;
	unsigned long long	 size;
	const char		*name;

	if ((s = cmd_find_session(ctx, data->target)) == NULL)
		return (-1);

	RB_FOREACH(wl, winlinks, &s->windows) {
		w = wl->window;
		ctx->print(ctx,
		    "%3d: %s [%ux%u]", wl->idx, w->name, w->sx, w->sy);

		TAILQ_FOREACH(wp, &w->panes, entry) {
			gd = wp->base.grid;

			size = 0;
			for (i = 0; i < gd->hsize; i++) {
				size += gd->size[i] * sizeof **gd->data;
				size += gd->usize[i] * sizeof **gd->udata;
			}
			size += gd->hsize * (sizeof *gd->data);
			size += gd->hsize * (sizeof *gd->size);

			if (wp->fd != -1)
				name = ttyname(wp->fd);
			else
				name = "unknown";
			ctx->print(ctx,
			    "     %s [%ux%u] [history %u/%u, %llu bytes]",
			    name, wp->sx, wp->sy, gd->hsize, gd->hlimit, size);
		}
	}

	return (0);
}