Basic horizontal splitting and layout management. Still some redraw and other

issues - particularly, don't mix with manual pane resizing and be careful when
viewing from multiple clients; generally cycling the layout a few times will
fix most problems. Getting this in for testing while I think about how to deal
with manual mode.

Split window as normal and cycle the layouts with C-b space. Some of the
layouts will work better when swap-pane comes along.

layout.c

@@ -0,0 +1,219 @@
+/* $Id: layout.c,v 1.1 2009-04-01 18:21:32 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"
+
+void	layout_manual(struct window *);
+void	layout_active_only(struct window *);
+void	layout_even_horizontal(struct window *);
+void	layout_even_vertical(struct window *);
+void	layout_left_vertical(struct window *);
+
+const struct {
+	const char	*name;
+	void		(*fn)(struct window *);
+} layouts[] = {
+	{ "manual", layout_manual },
+	{ "active-only", layout_active_only },
+	{ "even-horizontal", layout_even_horizontal },
+	{ "even-vertical", layout_even_vertical },
+	{ "left-vertical", layout_left_vertical },
+}; 
+
+void
+layout_next(struct window *w)
+{
+	w->layout++;
+	if (w->layout > nitems(layouts) - 1) {
+		w->layout = 0;
+		/* XXX Special-case manual. */
+		window_fit_panes(w);
+		window_update_panes(w);
+	}
+	layout_refresh(w);
+}
+
+void
+layout_refresh(struct window *w)
+{
+	layouts[w->layout].fn(w);
+	server_redraw_window(w);
+}
+
+void
+layout_manual(unused struct window *w)
+{
+}
+
+void
+layout_active_only(struct window *w)
+{
+	struct window_pane	*wp;
+	
+	TAILQ_FOREACH(wp, &w->panes, entry) {
+		if (wp == w->active) { 
+			wp->flags &= ~PANE_HIDDEN;
+			wp->xoff = wp->yoff = 0;
+			window_pane_resize(wp, w->sx, w->sy);
+		} else
+			wp->flags |= PANE_HIDDEN;
+	}
+}
+
+void
+layout_even_horizontal(struct window *w)
+{
+	struct window_pane	*wp;
+	u_int			 i, n, width, xoff;
+
+	/* How many can we fit? */
+	n = window_count_panes(w);
+	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 (i > n) {
+			wp->flags |= PANE_HIDDEN;
+			continue;
+		}
+		wp->flags &= ~PANE_HIDDEN;
+
+		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_vertical(struct window *w)
+{
+	struct window_pane	*wp;
+	u_int			 i, n, height, yoff;
+
+	/* How many can we fit? */
+	n = window_count_panes(w);
+	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 (i > n) {
+			wp->flags |= PANE_HIDDEN;
+			continue;
+		}
+		wp->flags &= ~PANE_HIDDEN;
+
+		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_left_vertical(struct window *w)
+{
+	struct window_pane	*wp;
+	u_int			 i, n, height, yoff;
+
+	/* Need >1 pane and minimum columns; if fewer, display active only. */
+	n = window_count_panes(w) - 1;
+	if (n == 0 || w->sx < 82 + PANE_MINIMUM) {
+		layout_active_only(w);
+		return;
+	}
+
+	/* 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, 81, w->sy);
+			wp->flags &= ~PANE_HIDDEN;
+			continue;
+		}
+
+		if (i > n) {
+			wp->flags |= PANE_HIDDEN;
+			continue;
+		}
+		wp->flags &= ~PANE_HIDDEN;
+
+		wp->xoff = 82;
+		wp->yoff = yoff;
+		if (i != n - 1)
+ 			window_pane_resize(wp, w->sx - 82, height - 1);
+		else
+ 			window_pane_resize(wp, w->sx - 82, 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);
+	}
+}