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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: layout.c,v 1.2 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 <string.h>

#include "tmux.h"

/*
 * Each layout has two functions, _refresh to relayout the panes and _resize to
 * resize a single pane.
 *
 * Second argument (int) to _refresh is 1 if the only change has been that the
 * active pane has changed. If 0 then panes, active pane or both may have
 * changed.
 */

void	layout_active_only_refresh(struct window *, int);
void	layout_even_h_refresh(struct window *, int);
void	layout_even_v_refresh(struct window *, int);
void	layout_main_h_refresh(struct window *, int);
void	layout_main_v_refresh(struct window *, int);

const struct {
	const char     *name;
	void		(*refresh)(struct window *, int);
	void		(*resize)(struct window_pane *, int);
} layouts[] = {
	{ "manual-vertical", layout_manual_v_refresh, layout_manual_v_resize },
	{ "active-only", layout_active_only_refresh, NULL },
	{ "even-horizontal", layout_even_h_refresh, NULL },
	{ "even-vertical", layout_even_v_refresh, NULL },
	{ "main-horizontal", layout_main_h_refresh, NULL },
	{ "main-vertical", layout_main_v_refresh, NULL },
};

const char *
layout_name(struct window *w)
{
	return (layouts[w->layout].name);
}

int
layout_lookup(const char *name)
{
	u_int	i;
	int	matched = -1;

	for (i = 0; i < nitems(layouts); i++) {
		if (strncmp(layouts[i].name, name, strlen(name)) == 0) {
			if (matched != -1)	/* ambiguous */
				return (-1);
			matched = i;
		}
	}

	return (matched);
}

int
layout_select(struct window *w, u_int layout)
{
	if (layout > nitems(layouts) - 1 || layout == w->layout)
		return (-1);
	w->layout = layout;

	layout_refresh(w, 0);
	return (0);
}

void
layout_next(struct window *w)
{
	w->layout++;
	if (w->layout > nitems(layouts) - 1)
		w->layout = 0;
	layout_refresh(w, 0);
}

void
layout_previous(struct window *w)
{
	if (w->layout == 0)
		w->layout = nitems(layouts) - 1;
	else
		w->layout--;
	layout_refresh(w, 0);
}

void
layout_refresh(struct window *w, int active_only)
{
	layouts[w->layout].refresh(w, active_only);
	server_redraw_window(w);
}

int
layout_resize(struct window_pane *wp, int adjust)
{
	struct window	*w = wp->window;

	if (layouts[w->layout].resize == NULL)
		return (-1);
	layouts[w->layout].resize(wp, adjust);
	return (0);
}

void
layout_active_only_refresh(struct window *w, unused int active_only)
{
	struct window_pane	*wp;
	u_int			 xoff;

	xoff = w->sx;
	TAILQ_FOREACH(wp, &w->panes, entry) {
		/* Put the active pane on screen and the rest to the right. */
		if (wp == w->active)
			wp->xoff = 0;
		else {
			wp->xoff = xoff;
			xoff += w->sx;
		}
		wp->yoff = 0;
		window_pane_resize(wp, w->sx, w->sy);
	}
}

void
layout_even_h_refresh(struct window *w, int active_only)
{
	struct window_pane	*wp;
	u_int			 i, n, width, xoff;

	if (active_only)
		return;

	/* If the screen is too small, show active only. */
	if (w->sx < PANE_MINIMUM || w->sy < PANE_MINIMUM) {
		layout_active_only_refresh(w, active_only);
		return;
	}

	/* Get number of panes. */
	n = window_count_panes(w);
	if (n == 0)
		return;

	/* How many can we fit? */
	if (w->sx / n < PANE_MINIMUM) {
		width = PANE_MINIMUM;
		n = UINT_MAX;
	} else
		width = w->sx / n;

	/* Fit the panes. */
	i = xoff = 0;
	TAILQ_FOREACH(wp, &w->panes, entry) {
		wp->xoff = xoff;
		wp->yoff = 0;
		if (i != n - 1)
 			window_pane_resize(wp, width - 1, w->sy);
		else
 			window_pane_resize(wp, width, w->sy);

		i++;
		xoff += width;
	}

	/* Any space left? */
	while (xoff++ < w->sx) {
		wp = TAILQ_LAST(&w->panes, window_panes);
		window_pane_resize(wp, wp->sx + 1, wp->sy);
	}
}

void
layout_even_v_refresh(struct window *w, int active_only)
{
	struct window_pane	*wp;
	u_int			 i, n, height, yoff;

	if (active_only)
		return;

	/* If the screen is too small, show active only. */
	if (w->sx < PANE_MINIMUM || w->sy < PANE_MINIMUM) {
		layout_active_only_refresh(w, active_only);
		return;
	}

	/* Get number of panes. */
	n = window_count_panes(w);
	if (n == 0)
		return;

	/* How many can we fit? */
	if (w->sy / n < PANE_MINIMUM) {
		height = PANE_MINIMUM;
		n = UINT_MAX;
	} else
		height = w->sy / n;

	/* Fit the panes. */
	i = yoff = 0;
	TAILQ_FOREACH(wp, &w->panes, entry) {
		wp->xoff = 0;
		wp->yoff = yoff;
		if (i != n - 1)
 			window_pane_resize(wp, w->sx, height - 1);
		else
 			window_pane_resize(wp, w->sx, height);

		i++;
		yoff += height;
	}

	/* Any space left? */
	while (yoff++ < w->sy) {
		wp = TAILQ_LAST(&w->panes, window_panes);
		window_pane_resize(wp, wp->sx, wp->sy + 1);
	}
}

void
layout_main_v_refresh(struct window *w, int active_only)
{
	struct window_pane	*wp;
	u_int			 i, n, mainwidth, height, yoff;

	if (active_only)
		return;

	/* Get number of panes. */
	n = window_count_panes(w);
	if (n == 0)
		return;

	/* Get the main pane width and add one for separator line. */
	mainwidth = options_get_number(&w->options, "main-pane-width") + 1;

	/* Need >1 pane and minimum columns; if fewer, display active only. */
	if (n == 1 ||
	    w->sx < mainwidth + PANE_MINIMUM || w->sy < PANE_MINIMUM) {
		layout_active_only_refresh(w, active_only);
		return;
	}
	n--;

	/* How many can we fit, not including first? */
	if (w->sy / n < PANE_MINIMUM) {
		height = PANE_MINIMUM;
		n = w->sy / PANE_MINIMUM;
	} else
		height = w->sy / n;

	/* Fit the panes. */
	i = yoff = 0;
	TAILQ_FOREACH(wp, &w->panes, entry) {
		if (wp == TAILQ_FIRST(&w->panes)) {
			wp->xoff = 0;
			wp->yoff = 0;
			window_pane_resize(wp, mainwidth - 1, w->sy);
			continue;
		}

		wp->xoff = mainwidth;
		wp->yoff = yoff;
		if (i != n - 1)
 			window_pane_resize(wp, w->sx - mainwidth, height - 1);
		else
 			window_pane_resize(wp, w->sx - mainwidth, height);

		i++;
		yoff += height;
	}

	/* Any space left? */
	while (yoff++ < w->sy) {
		wp = TAILQ_LAST(&w->panes, window_panes);
		while (wp != NULL && wp == TAILQ_FIRST(&w->panes))
			wp = TAILQ_PREV(wp, window_panes, entry);
		if (wp == NULL)
			break;
		window_pane_resize(wp, wp->sx, wp->sy + 1);
	}
}

void
layout_main_h_refresh(struct window *w, int active_only)
{
	struct window_pane	*wp;
	u_int			 i, n, mainheight, width, xoff;

	if (active_only)
		return;

	/* Get number of panes. */
	n = window_count_panes(w);
	if (n == 0)
		return;

	/* Get the main pane height and add one for separator line. */
	mainheight = options_get_number(&w->options, "main-pane-height") + 1;

	/* Need >1 pane and minimum rows; if fewer, display active only. */
	if (n == 1 ||
	    w->sy < mainheight + PANE_MINIMUM || w->sx < PANE_MINIMUM) {
		layout_active_only_refresh(w, active_only);
		return;
	}
	n--;

	/* How many can we fit, not including first? */
	if (w->sx / n < PANE_MINIMUM) {
		width = PANE_MINIMUM;
		n = w->sx / PANE_MINIMUM;
	} else
		width = w->sx / n;

	/* Fit the panes. */
	i = xoff = 0;
	TAILQ_FOREACH(wp, &w->panes, entry) {
		if (wp == TAILQ_FIRST(&w->panes)) {
			wp->xoff = 0;
			wp->yoff = 0;
			window_pane_resize(wp, w->sx, mainheight - 1);
			continue;
		}

		wp->xoff = xoff;
		wp->yoff = mainheight;
		if (i != n - 1)
 			window_pane_resize(wp, width - 1, w->sy - mainheight);
		else
 			window_pane_resize(wp, width - 1, w->sy - mainheight);

		i++;
		xoff += width;
	}

	/* Any space left? */
	while (xoff++ < w->sx + 1) {
		wp = TAILQ_LAST(&w->panes, window_panes);
		while (wp != NULL && wp == TAILQ_FIRST(&w->panes))
			wp = TAILQ_PREV(wp, window_panes, entry);
		if (wp == NULL)
			break;
		window_pane_resize(wp, wp->sx + 1, wp->sy);
	}
}