/* $Id: cmd-resize-pane-down.c,v 1.6 2009-01-19 18:23:40 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 <stdlib.h>

#include "tmux.h"

/*
 * Decrease pane size.
 */

void	cmd_resize_pane_down_init(struct cmd *, int);
int	cmd_resize_pane_down_exec(struct cmd *, struct cmd_ctx *);

const struct cmd_entry cmd_resize_pane_down_entry = {
	"resize-pane-down", "resizep-down",
	CMD_PANE_WINDOW_USAGE " [adjustment]",
	CMD_ARG01|CMD_CANREPEAT,
	cmd_resize_pane_down_init,
	cmd_pane_parse,
	cmd_resize_pane_down_exec,
       	cmd_pane_send,
	cmd_pane_recv,
	cmd_pane_free,
	cmd_pane_print
};

void
cmd_resize_pane_down_init(struct cmd *self, int key)
{
	struct cmd_pane_data	*data;

	cmd_pane_init(self, key);
	data = self->data;

	if (key == KEYC_ADDESC(KEYC_DOWN))
		data->arg = xstrdup("5");
}

int
cmd_resize_pane_down_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_pane_data	*data = self->data;
	struct winlink		*wl;
	const char	       	*errstr;
	struct window_pane	*wp, *wq;
	u_int			 adjust;
	
	if ((wl = cmd_find_window(ctx, data->target, NULL)) == NULL)
		return (-1);
	if (data->pane == -1)
		wp = wl->window->active;
	else {
		wp = window_pane_at_index(wl->window, data->pane);
		if (wp == NULL) {
			ctx->error(ctx, "no pane: %d", data->pane);
			return (-1);
		}
	}

	if (data->arg == NULL)
		adjust = 1;
	else {
		adjust = strtonum(data->arg, 1, INT_MAX, &errstr);
		if (errstr != NULL) {
			ctx->error(ctx, "adjustment %s: %s", errstr, data->arg);
			return (-1);
		}
	}

	/*
	 * If this is not the last window, keep trying to increase size and
	 * remove it from the next windows. If it is the last, do so on the
	 * previous window.
	 */
	if (TAILQ_NEXT(wp, entry) == NULL) {
		if (wp == TAILQ_FIRST(&wl->window->panes)) {
			/* Only one pane. */
			return (0);
		}
		wp = TAILQ_PREV(wp, window_panes, entry);
	}
	while (adjust-- > 0) {
		wq = wp;
		while ((wq = TAILQ_NEXT(wq, entry)) != NULL) {
			if (wq->sy > PANE_MINIMUM) {
				window_pane_resize(wq, wq->sx, wq->sy - 1);
				break;
			}
		}
		if (wq == NULL)
			break;
		window_pane_resize(wp, wp->sx, wp->sy + 1);

	}
	window_update_panes(wl->window);

	server_redraw_window(wl->window);

	return (0);
}