Add other-pane-height and other-pane-width options, allowing the width

or height of the smaller panes in the main-horizontal and main-vertical
layouts to be set. Mostly from David Goodlad.

cmd-set-option.c

@@ -159,6 +159,8 @@ const struct set_option_entry set_window_option_table[] = {
 	{ "monitor-activity", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "monitor-content", SET_OPTION_STRING, 0, 0, NULL },
 	{ "monitor-silence",SET_OPTION_NUMBER, 0, INT_MAX, NULL},
+	{ "other-pane-height", SET_OPTION_NUMBER, 0, INT_MAX, NULL },
+	{ "other-pane-width", SET_OPTION_NUMBER, 0, INT_MAX, NULL },
 	{ "remain-on-exit", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "synchronize-panes", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "utf8", SET_OPTION_FLAG, 0, 0, NULL },

layout-set.c

@@ -231,8 +231,8 @@ layout_set_main_h(struct window *w)
 {
 	struct window_pane	*wp;
 	struct layout_cell	*lc, *lcmain, *lcrow, *lcchild;
-	u_int			 n, mainheight, width, height, used;
-	u_int			 i, j, columns, rows, totalrows;
+	u_int			 n, mainheight, otherheight, width, height;
+	u_int			 used, i, j, columns, rows, totalrows;
 
 	layout_print_cell(w->layout_root, __func__, 1);
 
@@ -252,6 +252,16 @@ layout_set_main_h(struct window *w)
 
 	/* Get the main pane height and add one for separator line. */
 	mainheight = options_get_number(&w->options, "main-pane-height") + 1;
+
+	/* Get the optional other pane height and add one for separator line. */
+	otherheight = options_get_number(&w->options, "other-pane-height") + 1;
+
+	/*
+	 * If an other pane height was specified, honour it so long as it
+	 * doesn't shrink the main height to less than the main-pane-height
+	 */
+	if (otherheight > 1 && w->sx - otherheight > mainheight)
+		mainheight = w->sx - otherheight;
 	if (mainheight < PANE_MINIMUM + 1)
 		mainheight = PANE_MINIMUM + 1;
 
@@ -342,8 +352,8 @@ layout_set_main_v(struct window *w)
 {
 	struct window_pane	*wp;
 	struct layout_cell	*lc, *lcmain, *lccolumn, *lcchild;
-	u_int			 n, mainwidth, width, height, used;
-	u_int			 i, j, columns, rows, totalcolumns;
+	u_int			 n, mainwidth, otherwidth, width, height;
+	u_int			 used, i, j, columns, rows, totalcolumns;
 
 	layout_print_cell(w->layout_root, __func__, 1);
 
@@ -363,6 +373,16 @@ layout_set_main_v(struct window *w)
 
 	/* Get the main pane width and add one for separator line. */
 	mainwidth = options_get_number(&w->options, "main-pane-width") + 1;
+
+	/* Get the optional other pane width and add one for separator line. */
+	otherwidth = options_get_number(&w->options, "other-pane-width") + 1;
+
+	/*
+	 * If an other pane width was specified, honour it so long as it
+	 * doesn't shrink the main width to less than the main-pane-width
+	 */
+	if (otherwidth > 1 && w->sx - otherwidth > mainwidth)
+		mainwidth = w->sx - otherwidth;
 	if (mainwidth < PANE_MINIMUM + 1)
 		mainwidth = PANE_MINIMUM + 1;
 

tmux.1

@@ -2195,6 +2195,25 @@ Windows that have been silent for the interval are highlighted in the
 status line.
 An interval of zero disables the monitoring.
 .Pp
+.It Ic other-pane-height Ar height
+Set the height of the other panes (not the main pane) in the
+.Ic main-horizontal
+layout.
+If this option is set to 0 (the default), it will have no effect.
+If both the
+.Ic main-pane-height
+and
+.Ic other-pane-height
+options are set, the main pane will grow taller to make the other panes the
+specified height, but will never shrink to do so.
+.Pp
+.It Ic other-pane-width Ar width
+Like
+.Ic other-pane-height ,
+but set the width of other panes in the
+.Ic main-vertical
+layout.
+.Pp
 .It Xo Ic remain-on-exit
 .Op Ic on | off
 .Xc

tmux.c

@@ -404,6 +404,8 @@ main(int argc, char **argv)
 	options_set_number(wo, "monitor-activity", 0);
 	options_set_string(wo, "monitor-content", "%s", "");
 	options_set_number(wo, "monitor-silence", 0);
+	options_set_number(wo, "other-pane-height", 0);
+	options_set_number(wo, "other-pane-width", 0);
 	options_set_number(wo, "window-status-attr", 0);
 	options_set_number(wo, "window-status-bg", 8);
 	options_set_number(wo, "window-status-current-attr", 0);