Add group-last command that shows only the previously active group; ok okan

calmwm.h

@@ -214,6 +214,7 @@ struct screen_ctx {
 	struct region_q		 regionq;
 	struct group_q		 groupq;
 	struct group_ctx	*group_active;
+	struct group_ctx	*group_last;
 	Colormap		 colormap;
 	Visual			*visual;
 	struct {
@@ -501,6 +502,7 @@ void			 kbfunc_client_toggle_group(void *, struct cargs *);
 void			 kbfunc_client_movetogroup(void *, struct cargs *);
 void			 kbfunc_group_toggle(void *, struct cargs *);
 void			 kbfunc_group_only(void *, struct cargs *);
+void			 kbfunc_group_last(void *, struct cargs *);
 void			 kbfunc_group_close(void *, struct cargs *);
 void			 kbfunc_group_cycle(void *, struct cargs *);
 void			 kbfunc_group_toggle_all(void *, struct cargs *);

conf.c

@@ -139,6 +139,7 @@ static const struct {
 
 	{ FUNC_SC(group-cycle, group_cycle, (CWM_CYCLE_FORWARD)) },
 	{ FUNC_SC(group-rcycle, group_cycle, (CWM_CYCLE_REVERSE)) },
+	{ FUNC_SC(group-last, group_last, 0) },
 	{ FUNC_SC(group-toggle-all, group_toggle_all, 0) },
 	{ FUNC_SC(group-toggle-1, group_toggle, 1) },
 	{ FUNC_SC(group-toggle-2, group_toggle, 2) },

cwmrc.5

@@ -273,6 +273,8 @@ menu.
 Toggle visibility of group n, where n is 1-9.
 .It group-only-[n]
 Show only group n, where n is 1-9, hiding other groups.
+.It group-last
+Show only the previously active group.
 .It group-close-[n]
 Close all windows in group n, where n is 1-9.
 .It group-toggle-all

group.c

@@ -215,6 +215,9 @@ group_only(struct screen_ctx *sc, int idx)
 {
 	struct group_ctx	*gc;
 
+	if (sc->group_last != sc->group_active)
+		sc->group_last = sc->group_active;
+
 	TAILQ_FOREACH(gc, &sc->groupq, entry) {
 		if (gc->num == idx)
 			group_show(gc);

kbfunc.c

@@ -478,6 +478,14 @@ kbfunc_group_only(void *ctx, struct cargs *cargs)
 	group_only(ctx, cargs->flag);
 }
 
+void
+kbfunc_group_last(void *ctx, struct cargs *cargs)
+{
+	struct screen_ctx	*sc = ctx;
+
+	group_only(ctx, sc->group_last->num);
+}
+
 void
 kbfunc_group_toggle(void *ctx, struct cargs *cargs)
 {

screen.c

@@ -60,6 +60,7 @@ screen_init(int which)
 	xu_ewmh_net_supported_wm_check(sc);
 
 	conf_group(sc);
+	sc->group_last = sc->group_active;
 	screen_update_geometry(sc);
 
 	xu_ewmh_net_desktop_names(sc);