If select-layout is not given an argument, repply the last layout used in the

window, if any.

cmd-select-layout.c

@@ -29,8 +29,8 @@ int	cmd_select_layout_exec(struct cmd *, struct cmd_ctx *);
 
 const struct cmd_entry cmd_select_layout_entry = {
 	"select-layout", "selectl",
-	CMD_TARGET_WINDOW_USAGE " layout-name",
-	CMD_ARG1, 0,
+	CMD_TARGET_WINDOW_USAGE " [layout-name]",
+	CMD_ARG01, 0,
 	cmd_select_layout_init,
 	cmd_target_parse,
 	cmd_select_layout_exec,
@@ -72,11 +72,15 @@ cmd_select_layout_exec(struct cmd *self, struct cmd_ctx *ctx)
 	if ((wl = cmd_find_window(ctx, data->target, NULL)) == NULL)
 		return (-1);
 
-	if ((layout = layout_set_lookup(data->arg)) == -1) {
- 		ctx->error(ctx, "unknown or ambiguous layout: %s", data->arg);
- 		return (-1);
- 	}
-
+	if (data->arg == NULL) {
+		layout = wl->window->lastlayout;
+		if (layout == -1)
+			return (0);
+	} else if ((layout = layout_set_lookup(data->arg)) == -1) {
+		ctx->error(ctx, "unknown layout or ambiguous: %s", data->arg);
+		return (-1);
+	}
+	
 	layout = layout_set_select(wl->window, layout);
 	ctx->info(ctx, "arranging in: %s", layout_set_name(layout));
 

cmd-server-info.c

@@ -112,9 +112,9 @@ cmd_server_info_exec(unused struct cmd *self, struct cmd_ctx *ctx)
 		RB_FOREACH(wl, winlinks, &s->windows) {
 			w = wl->window;
 			ctx->print(ctx, "%4u: %s [%ux%u] [flags=0x%x, "
-			    "references=%u, layout=%u]", wl->idx, w->name,
+			    "references=%u, last layout=%d]", wl->idx, w->name,
 			    w->sx, w->sy, w->flags, w->references,
-			    w->layout);
+			    w->lastlayout);
 			j = 0;
 			TAILQ_FOREACH(wp, &w->panes, entry) {
 				lines = ulines = size = usize = 0;

layout-set.c

@@ -74,36 +74,47 @@ layout_set_select(struct window *w, u_int layout)
 	if (layout_sets[layout].arrange != NULL)
 		layout_sets[layout].arrange(w);
 
-	w->layout = layout;
+	w->lastlayout = layout;
 	return (layout);
 }
 
 u_int
 layout_set_next(struct window *w)
 {
-	u_int	layout = w->layout;
+	u_int	layout;
+
+	if (w->lastlayout == -1)
+		layout = 0;
+	else {
+		layout = w->lastlayout + 1;
+		if (layout > nitems(layout_sets) - 1)
+			layout = 0;
+	}
 
 	if (layout_sets[layout].arrange != NULL)
 		layout_sets[layout].arrange(w);
-
-	w->layout++;
-	if (w->layout > nitems(layout_sets) - 1)
-		w->layout = 0;
+	w->lastlayout = layout;
 	return (layout);
 }
 
 u_int
 layout_set_previous(struct window *w)
 {
-	u_int	layout = w->layout;
+	u_int	layout;
+
+	if (w->lastlayout == -1)
+		layout = nitems(layout_sets) - 1;
+	else {
+		layout = w->lastlayout;
+		if (layout == 0)
+			layout = nitems(layout_sets) - 1;
+		else
+			layout--;
+	}
 
 	if (layout_sets[layout].arrange != NULL)
 		layout_sets[layout].arrange(w);
-
-	if (w->layout == 0)
-		w->layout = nitems(layout_sets) - 1;
-	else
-		w->layout--;
+	w->lastlayout = layout;
 	return (layout);
 }
 

tmux.1

@@ -1064,10 +1064,13 @@ has the same meaning as in the
 command.
 .It Xo Ic select-layout
 .Op Fl t Ar target-window
-.Ar layout-name
+.Op Ar layout-name
 .Xc
 .D1 (alias: selectl )
 Choose a specific layout for a window.
+If
+.Ar layout-name
+is not given, the last layout used (if any) is reapplied.
 .It Xo Ic select-pane
 .Op Fl p Ar pane-index
 .Op Fl t Ar target-window

tmux.h

@@ -663,7 +663,7 @@ struct window {
 	struct window_pane *active;
 	struct window_panes panes;
 
-	u_int		 layout;
+	int		 lastlayout;
 	struct layout_cell *layout_root;
 
 	u_int		 sx;

window.c

@@ -231,7 +231,7 @@ window_create1(u_int sx, u_int sy)
 	TAILQ_INIT(&w->panes);
 	w->active = NULL;
 
-	w->layout = 0;
+	w->lastlayout = -1;
 	w->layout_root = NULL;
 	
 	w->sx = sx;