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Get rid of the PANE_HIDDEN flag in favour of a function, and moving the
decision for whether or not a pane should be drawn out of the layout code and
into the redraw code.

This is needed for the new layout design, getting it in now to make that easier
to work on.

/* $OpenBSD: cmd-swap-pane.c,v 1.4 2009/07/14 07:23:36 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"

/*
 * Swap two panes.
 */

int	cmd_swap_pane_parse(struct cmd *, int, char **, char **);
int	cmd_swap_pane_exec(struct cmd *, struct cmd_ctx *);
void	cmd_swap_pane_send(struct cmd *, struct buffer *);
void	cmd_swap_pane_recv(struct cmd *, struct buffer *);
void	cmd_swap_pane_free(struct cmd *);
void	cmd_swap_pane_init(struct cmd *, int);
size_t	cmd_swap_pane_print(struct cmd *, char *, size_t);

struct cmd_swap_pane_data {
	char	*target;
        int	 src;
	int	 dst;
	int	 flag_detached;
	int	 flag_up;
	int	 flag_down;
};

const struct cmd_entry cmd_swap_pane_entry = {
	"swap-pane", "swapp",
	"[-dDU] [-t target-window] [-p src-index] [-q dst-index]",
	0, 0,
	cmd_swap_pane_init,
	cmd_swap_pane_parse,
	cmd_swap_pane_exec,
	cmd_swap_pane_send,
	cmd_swap_pane_recv,
	cmd_swap_pane_free,
	cmd_swap_pane_print
};

void
cmd_swap_pane_init(struct cmd *self, int key)
{
	struct cmd_swap_pane_data	 *data;

	self->data = data = xmalloc(sizeof *data);
	data->target = NULL;
	data->src = -1;
	data->dst = -1;
	data->flag_detached = 0;
	data->flag_up = 0;
	data->flag_down = 0;

	switch (key) {
	case '{':
		data->flag_up = 1;
		break;
	case '}':
		data->flag_down = 1;
		break;
	}
}

int
cmd_swap_pane_parse(struct cmd *self, int argc, char **argv, char **cause)
{
	struct cmd_swap_pane_data	*data;
	int				 opt, n;
	const char			*errstr;

	self->entry->init(self, 0);
	data = self->data;

	while ((opt = getopt(argc, argv, "dDt:p:q:U")) != -1) {
		switch (opt) {
		case 'd':
			data->flag_detached = 1;
			break;
		case 'D':
			data->flag_up = 0;
			data->flag_down = 1;
			data->dst = -1;
			break;
		case 't':
			if (data->target == NULL)
				data->target = xstrdup(optarg);
			break;
		case 'p':
			if (data->src == -1) {
				n = strtonum(optarg, 0, INT_MAX, &errstr);
				if (errstr != NULL) {
					xasprintf(cause, "src %s", errstr);
					goto error;
				}
				data->src = n;
			}
			break;
		case 'q':
			if (data->dst == -1) {
				n = strtonum(optarg, 0, INT_MAX, &errstr);
				if (errstr != NULL) {
					xasprintf(cause, "dst %s", errstr);
					goto error;
				}
				data->dst = n;
			}
			data->flag_up = 0;
			data->flag_down = 0;
			break;
		case 'U':
			data->flag_up = 1;
			data->flag_down = 0;
			data->dst = -1;
			break;

		default:
			goto usage;
		}
	}
	argc -= optind;
	argv += optind;
	if (argc != 0)
		goto usage;

	return (0);

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

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

int
cmd_swap_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_swap_pane_data	*data = self->data;
	struct winlink			*wl;
	struct window			*w;
	struct window_pane		*tmp_wp, *src_wp, *dst_wp;
	u_int				 xx, yy;

	if (data == NULL)
		return (0);

	if ((wl = cmd_find_window(ctx, data->target, NULL)) == NULL)
		return (-1);
	w = wl->window;

	if (data->src == -1)
		src_wp = w->active;
	else {
		src_wp = window_pane_at_index(w, data->src);
		if (src_wp == NULL) {
			ctx->error(ctx, "no pane: %d", data->src);
			return (-1);
		}
	}
	if (data->dst == -1)
		dst_wp = w->active;
	else {
		dst_wp = window_pane_at_index(w, data->dst);
		if (dst_wp == NULL) {
			ctx->error(ctx, "no pane: %d", data->dst);
			return (-1);
		}
	}

	if (data->dst == -1 && data->flag_up) {
		if ((dst_wp = TAILQ_PREV(src_wp, window_panes, entry)) == NULL)
			dst_wp = TAILQ_LAST(&w->panes, window_panes);
	}
	if (data->dst == -1 && data->flag_down) {
		if ((dst_wp = TAILQ_NEXT(src_wp, entry)) == NULL)
			dst_wp = TAILQ_FIRST(&w->panes);
	}

	if (src_wp == dst_wp)
		return (0);

	tmp_wp = TAILQ_PREV(dst_wp, window_panes, entry);
	TAILQ_REMOVE(&w->panes, dst_wp, entry);
	TAILQ_REPLACE(&w->panes, src_wp, dst_wp, entry);
	if (tmp_wp == src_wp)
		tmp_wp = dst_wp;
	if (tmp_wp == NULL)
		TAILQ_INSERT_HEAD(&w->panes, src_wp, entry);
	else
		TAILQ_INSERT_AFTER(&w->panes, tmp_wp, src_wp, entry);

	xx = src_wp->xoff;
	yy = src_wp->yoff;
 	src_wp->xoff = dst_wp->xoff;
 	src_wp->yoff = dst_wp->yoff;
 	dst_wp->xoff = xx;
 	dst_wp->yoff = yy;

	xx = src_wp->sx;
	yy = src_wp->sy;
	window_pane_resize(src_wp, dst_wp->sx, dst_wp->sy);
	window_pane_resize(dst_wp, xx, yy);

	if (!data->flag_detached) {
		tmp_wp = dst_wp;
		if (!window_pane_visible(tmp_wp))
			tmp_wp = src_wp;
		window_set_active_pane(w, tmp_wp);
		layout_refresh(w, 0);
	}

	return (0);
}

void
cmd_swap_pane_send(struct cmd *self, struct buffer *b)
{
	struct cmd_swap_pane_data	*data = self->data;

	buffer_write(b, data, sizeof *data);
	cmd_send_string(b, data->target);
}

void
cmd_swap_pane_recv(struct cmd *self, struct buffer *b)
{
	struct cmd_swap_pane_data	*data;

	self->data = data = xmalloc(sizeof *data);
	buffer_read(b, data, sizeof *data);
	data->target = cmd_recv_string(b);
}

void
cmd_swap_pane_free(struct cmd *self)
{
	struct cmd_swap_pane_data	*data = self->data;

	if (data->target != NULL)
		xfree(data->target);
	xfree(data);
}

size_t
cmd_swap_pane_print(struct cmd *self, char *buf, size_t len)
{
	struct cmd_swap_pane_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_down || data->flag_up || data->flag_detached)) {
		off += xsnprintf(buf + off, len - off, " -");
		if (off < len && data->flag_detached)
			off += xsnprintf(buf + off, len - off, "d");
		if (off < len && data->flag_up)
			off += xsnprintf(buf + off, len - off, "D");
		if (off < len && data->flag_down)
			off += xsnprintf(buf + off, len - off, "U");
	}
	if (off < len && data->target != NULL)
		off += cmd_prarg(buf + off, len - off, " -t ", data->target);
	if (off < len && data->src != -1)
		off += xsnprintf(buf + off, len - off, " -p %d", data->src);
	if (off < len && data->dst != -1)
		off += xsnprintf(buf + off, len - off, " -q %d", data->dst);
	return (off);
}