Support for windows larger than visible on the attached client. This has

been a limitation for a long time.

There are two new options, window-size and default-size, and a new
command, resize-window. The force-width and force-height options and the
session_width and session_height formats have been removed.

The new window-size option tells tmux how to work out the size of
windows: largest means it picks the size of the largest session,
smallest the smallest session (similar to the old behaviour) and manual
means that it does not automatically resize windows. The default is
currently largest but this may change. aggressive-resize modifies the
choice of session for largest and smallest as it did before.

If a window is in a session attached to a client that is too small, only
part of the window is shown. tmux attempts to keep the cursor visible,
so the part of the window displayed is changed as the cursor moves (with
a small delay, to try and avoid excess redrawing when applications
redraw status lines or similar that are not currently visible). The
offset of the visible portion of the window is shown in status-right.

Drawing windows which are larger than the client is not as efficient as
those which fit, particularly when the cursor moves, so it is
recommended to avoid using this on slow machines or networks (set
window-size to smallest or manual).

The resize-window command can be used to resize a window manually. If it
is used, the window-size option is automatically set to manual for the
window (undo this with "setw -u window-size"). resize-window works in a
similar way to resize-pane (-U -D -L -R -x -y flags) but also has -a and
-A flags. -a sets the window to the size of the smallest client (what it
would be if window-size was smallest) and -A the largest.

For the same behaviour as force-width or force-height, use resize-window
-x or -y, and "setw -u window-size" to revert to automatic sizing..

If the global window-size option is set to manual, the default-size
option is used for new windows. If -x or -y is used with new-session,
that sets the default-size option for the new session.

The maximum size of a window is 10000x10000. But expect applications to
complain and much higher memory use if making a window excessively
big. The minimum size is the size required for the current layout
including borders.

The refresh-client command can be used to pan around a window, -U -D -L
-R moves up, down, left or right and -c returns to automatic cursor
tracking. The position is reset when the current window is changed.

1 files changed, 197 insertions, 113 deletions

diff --git a/resize.c b/resize.c
index 1c9694da..fef8feeb 100644
--- a/resize.c
+++ b/resize.c
@@ -22,144 +22,228 @@
 
 #include "tmux.h"
 
-/*
- * Recalculate window and session sizes.
- *
- * Every session has the size of the smallest client it is attached to and
- * every window the size of the smallest session it is attached to.
- *
- * So, when a client is resized or a session attached to or detached from a
- * client, the window sizes must be recalculated. For each session, find the
- * smallest client it is attached to, and resize it to that size. Then for
- * every window, find the smallest session it is attached to, resize it to that
- * size and clear and redraw every client with it as the current window.
- *
- * This is quite inefficient - better/additional data structures are needed
- * to make it better.
- */
+void
+resize_window(struct window *w, u_int sx, u_int sy)
+{
+	int	zoomed;
+
+	/* Check size limits. */
+	if (sx < WINDOW_MINIMUM)
+		sx = WINDOW_MINIMUM;
+	if (sx > WINDOW_MAXIMUM)
+		sx = WINDOW_MAXIMUM;
+	if (sy < WINDOW_MINIMUM)
+		sy = WINDOW_MINIMUM;
+	if (sy > WINDOW_MAXIMUM)
+		sy = WINDOW_MAXIMUM;
+
+	/* If the window is zoomed, unzoom. */
+	zoomed = w->flags & WINDOW_ZOOMED;
+	if (zoomed)
+		window_unzoom(w);
+
+	/* Resize the layout first. */
+	layout_resize(w, sx, sy);
+
+	/* Resize the window, it can be no smaller than the layout. */
+	if (sx < w->layout_root->sx)
+		sx = w->layout_root->sx;
+	if (sy < w->layout_root->sy)
+		sy = w->layout_root->sy;
+	window_resize(w, sx, sy);
+
+	/* Restore the window zoom state. */
+	if (zoomed)
+		window_zoom(w->active);
+
+	tty_update_window_offset(w);
+	server_redraw_window(w);
+	notify_window("window-layout-changed", w);
+}
 
 void
-recalculate_sizes(void)
+default_window_size(struct session *s, struct window *w, u_int *sx, u_int *sy,
+    int type)
 {
-	struct session		*s;
-	struct client		*c;
-	struct window		*w;
-	struct window_pane	*wp;
-	u_int			 ssx, ssy, has, limit, lines;
-	int			 flag, is_zoomed, forced;
+	struct client	*c;
+	u_int		 cx, cy;
+	const char	*value;
 
-	RB_FOREACH(s, sessions, &sessions) {
-		lines = status_line_size(s);
+	if (type == -1)
+		type = options_get_number(global_w_options, "window-size");
+	if (type == WINDOW_SIZE_MANUAL)
+		goto manual;
 
-		s->attached = 0;
-		ssx = ssy = UINT_MAX;
+	if (type == WINDOW_SIZE_LARGEST) {
+		*sx = *sy = 0;
 		TAILQ_FOREACH(c, &clients, entry) {
-			if (c->flags & CLIENT_SUSPENDED)
+			if (c->session == NULL)
 				continue;
-			if ((c->flags & (CLIENT_CONTROL|CLIENT_SIZECHANGED)) ==
-			    CLIENT_CONTROL)
+			if (c->flags & CLIENT_NOSIZEFLAGS)
 				continue;
-			if (c->session == s) {
-				if (c->tty.sx < ssx)
-					ssx = c->tty.sx;
-				c->flags &= ~CLIENT_STATUSOFF;
-				if (lines != 0 && lines + PANE_MINIMUM > c->tty.sy)
-					c->flags |= CLIENT_STATUSOFF;
-				if ((~c->flags & CLIENT_STATUSOFF) &&
-				    !(c->flags & CLIENT_CONTROL) &&
-				    c->tty.sy > lines &&
-				    c->tty.sy - lines < ssy)
-					ssy = c->tty.sy - lines;
-				else if (c->tty.sy < ssy)
-					ssy = c->tty.sy;
-				s->attached++;
-			}
+			if (w != NULL && !session_has(c->session, w))
+				continue;
+			if (w == NULL && c->session != s)
+				continue;
+
+			cx = c->tty.sx;
+			cy = c->tty.sy - status_line_size(c);
+
+			if (cx > *sx)
+				*sx = cx;
+			if (cy > *sy)
+				*sy = cy;
 		}
-		if (ssx == UINT_MAX || ssy == UINT_MAX)
-			continue;
+		if (*sx == 0 || *sy == 0)
+			goto manual;
+	} else {
+		*sx = *sy = UINT_MAX;
+		TAILQ_FOREACH(c, &clients, entry) {
+			if (c->session == NULL)
+				continue;
+			if (c->flags & CLIENT_NOSIZEFLAGS)
+				continue;
+			if (w != NULL && !session_has(c->session, w))
+				continue;
+			if (w == NULL && c->session != s)
+				continue;
 
-		if (lines != 0 && ssy == 0)
-			ssy = lines;
+			cx = c->tty.sx;
+			cy = c->tty.sy - status_line_size(c);
 
-		if (s->sx == ssx && s->sy == ssy)
-			continue;
+			if (cx < *sx)
+				*sx = cx;
+			if (cy < *sy)
+				*sy = cy;
+		}
+		if (*sx == UINT_MAX || *sy == UINT_MAX)
+			goto manual;
+	}
+	goto done;
 
-		log_debug("session $%u size %u,%u (was %u,%u)", s->id, ssx, ssy,
-		    s->sx, s->sy);
+manual:
+	value = options_get_string(s->options, "default-size");
+	if (sscanf(value, "%ux%u", sx, sy) != 2) {
+		*sx = 80;
+		*sy = 24;
+	}
 
-		s->sx = ssx;
-		s->sy = ssy;
+done:
+	if (*sx < WINDOW_MINIMUM)
+		*sx = WINDOW_MINIMUM;
+	if (*sx > WINDOW_MAXIMUM)
+		*sx = WINDOW_MAXIMUM;
+	if (*sy < WINDOW_MINIMUM)
+		*sy = WINDOW_MINIMUM;
+	if (*sy > WINDOW_MAXIMUM)
+		*sy = WINDOW_MAXIMUM;
+}
 
+void
+recalculate_sizes(void)
+{
+	struct session	*s;
+	struct client	*c;
+	struct window	*w;
+	u_int		 sx, sy, cx, cy;
+	int		 flags, type, current, has, changed;
+
+	/*
+	 * Clear attached count and update saved status line information for
+	 * each session.
+	 */
+	RB_FOREACH(s, sessions, &sessions) {
+		s->attached = 0;
 		status_update_saved(s);
 	}
 
+	/*
+	 * Increment attached count and check the status line size for each
+	 * client.
+	 */
+	TAILQ_FOREACH(c, &clients, entry) {
+		if ((s = c->session) == NULL)
+			continue;
+
+		flags = c->flags;
+		if (flags & CLIENT_SUSPENDED)
+			continue;
+		if ((flags & CLIENT_CONTROL) && (~flags & CLIENT_SIZECHANGED))
+			continue;
+
+		if (c->tty.sy <= status_line_size(c))
+			c->flags |= CLIENT_STATUSOFF;
+		else
+			c->flags &= ~CLIENT_STATUSOFF;
+
+		s->attached++;
+	}
+
+	/* Walk each window and adjust the size. */
 	RB_FOREACH(w, windows, &windows) {
 		if (w->active == NULL)
 			continue;
-		flag = options_get_number(w->options, "aggressive-resize");
+		log_debug("%s: @%u is %u,%u", __func__, w->id, w->sx, w->sy);
 
-		ssx = ssy = UINT_MAX;
-		RB_FOREACH(s, sessions, &sessions) {
-			if (s->attached == 0)
-				continue;
-			if (flag)
-				has = s->curw->window == w;
-			else
-				has = session_has(s, w);
-			if (has) {
-				if (s->sx < ssx)
-					ssx = s->sx;
-				if (s->sy < ssy)
-					ssy = s->sy;
-			}
-		}
-		if (ssx == UINT_MAX || ssy == UINT_MAX)
+		type = options_get_number(w->options, "window-size");
+		if (type == WINDOW_SIZE_MANUAL)
 			continue;
-
-		forced = 0;
-		limit = options_get_number(w->options, "force-width");
-		if (limit >= PANE_MINIMUM && ssx > limit) {
-			ssx = limit;
-			forced |= WINDOW_FORCEWIDTH;
-		}
-		limit = options_get_number(w->options, "force-height");
-		if (limit >= PANE_MINIMUM && ssy > limit) {
-			ssy = limit;
-			forced |= WINDOW_FORCEHEIGHT;
+		current = !options_get_number(w->options, "aggressive-resize");
+
+		changed = 1;
+		if (type == WINDOW_SIZE_LARGEST) {
+			sx = sy = 0;
+			TAILQ_FOREACH(c, &clients, entry) {
+				if ((s = c->session) == NULL)
+					continue;
+				if (current)
+					has = (s->curw->window == w);
+				else
+					has = session_has(s, w);
+				if (!has)
+					continue;
+
+				cx = c->tty.sx;
+				cy = c->tty.sy - status_line_size(c);
+
+				if (cx > sx)
+					sx = cx;
+				if (cy > sy)
+					sy = cy;
+			}
+			if (sx == 0 || sy == 0)
+				changed = 0;
+		} else {
+			sx = sy = UINT_MAX;
+			TAILQ_FOREACH(c, &clients, entry) {
+				if ((s = c->session) == NULL)
+					continue;
+				if (current)
+					has = (s->curw->window == w);
+				else
+					has = session_has(s, w);
+				if (!has)
+					continue;
+
+				cx = c->tty.sx;
+				cy = c->tty.sy - status_line_size(c);
+
+				if (cx < sx)
+					sx = cx;
+				if (cy < sy)
+					sy = cy;
+			}
+			if (sx == UINT_MAX || sy == UINT_MAX)
+				changed = 0;
 		}
+		if (w->sx == sx && w->sy == sy)
+			changed = 0;
 
-		if (w->sx == ssx && w->sy == ssy)
+		if (!changed) {
+			tty_update_window_offset(w);
 			continue;
-		log_debug("window @%u size %u,%u (was %u,%u)", w->id, ssx, ssy,
-		    w->sx, w->sy);
-
-		w->flags &= ~(WINDOW_FORCEWIDTH|WINDOW_FORCEHEIGHT);
-		w->flags |= forced;
-
-		is_zoomed = w->flags & WINDOW_ZOOMED;
-		if (is_zoomed)
-			window_unzoom(w);
-		layout_resize(w, ssx, ssy);
-		window_resize(w, ssx, ssy);
-		if (is_zoomed && window_pane_visible(w->active))
-			window_zoom(w->active);
-
-		/*
-		 * If the current pane is now not visible, move to the next
-		 * that is.
-		 */
-		wp = w->active;
-		while (!window_pane_visible(w->active)) {
-			w->active = TAILQ_PREV(w->active, window_panes, entry);
-			if (w->active == NULL)
-				w->active = TAILQ_LAST(&w->panes, window_panes);
-			if (w->active == wp)
-			       break;
 		}
-		if (w->active == w->last)
-			w->last = NULL;
-
-		server_redraw_window(w);
-		notify_window("window-layout-changed", w);
+		log_debug("%s: @%u changed to %u,%u", __func__, w->id, sx, sy);
+		resize_window(w, sx, sy);
 	}
 }