anybar: make sure to free the bar when unmanaging an external bar plus misc improvements ref. #118

dwm.c

@@ -1559,6 +1559,7 @@ createmon(void)
 			n = MAX(br->bar, n);
 	}
 
+	m->bar = NULL;
 	for (i = 0; i <= n && i < max_bars; i++) {
 		bar = ecalloc(1, sizeof(Bar));
 		bar->mon = m;
@@ -2337,7 +2338,7 @@ manage(Window w, XWindowAttributes *wa)
 		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
 	c->x = MAX(c->x, c->mon->mx);
 	/* only fix client y-offset, if the client center might cover the bar */
-	c->y = MAX(c->y, ((c->mon->bar->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
+	c->y = MAX(c->y, ((!c->mon->bar || c->mon->bar->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
 		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
 
 	wc.border_width = c->bw;
@@ -2988,7 +2989,7 @@ restack(Monitor *m)
 		return;
 	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
 		XRaiseWindow(dpy, m->sel->win);
-	if (m->lt[m->sellt]->arrange) {
+	if (m->lt[m->sellt]->arrange && m->bar) {
 		wc.stack_mode = Below;
 		wc.sibling = m->bar->win;
 		for (c = m->stack; c; c = c->snext)

patch/bar_anybar.c

@@ -12,7 +12,11 @@ managealtbar(Window win, XWindowAttributes *wa)
 		bar->topbar = topbar;
 	} else if (bar && bar->win) {
 		bar->next = ecalloc(1, sizeof(Bar));
+		#if BAR_ANYBAR_STACK_BARS_PATCH
+		bar->next->topbar = topbar;
+		#else
 		bar->next->topbar = !bar->topbar;
+		#endif // BAR_ANYBAR_STACK_BARS_PATCH
 		bar = bar->next;
 	}
 	bar->external = 1;
@@ -43,18 +47,23 @@ void
 unmanagealtbar(Window w)
 {
 	Monitor *m = wintomon(w);
-	Bar *bar;
+	Bar *bar, *next, *prev = NULL;
 
 	if (!m)
 		return;
 
-	for (bar = m->bar; bar && bar->win; bar = bar->next)
+	for (bar = m->bar; bar && bar->win; bar = next) {
+		next = bar->next;
 		if (bar->win == w) {
-			bar->win = 0;
+			if (prev)
-			bar->by = 0;
+				prev->next = next;
-			bar->bh = 0;
+			else
+				m->bar = next;
+			free(bar);
 			break;
 		}
+		prev = bar;
+	}
 	updatebarpos(m);
 	arrange(m);
 }

patches.def.h

@@ -223,12 +223,17 @@
  * togglebar affect the external bar in the same way.
  *
  * NB: Unless you want both anybar + dwm bar(s) then the recommendation is to disable all
- * bar modules and have { 0 } in the barrules.
+ * bar modules and have { -2 } in the barrules.
  *
  * https://dwm.suckless.org/patches/anybar/
  */
 #define BAR_ANYBAR_PATCH 0
 
+/* Anybar option to stack multiple external bars at the top or at the bottom of the monitor
+ * instead of adding a second bar at the opposite side.
+ */
+#define BAR_ANYBAR_STACK_BARS_PATCH 0
+
 /* This patch adds a border around the status bar(s) just like the border of client windows.
  * https://codemadness.org/paste/dwm-border-bar.patch
  */