Adding xkb patch as per request #111

patch/include.c

@@ -298,6 +298,9 @@
 #if ZOOMSWAP_PATCH
 #include "zoomswap.c"
 #endif
+#if XKB_PATCH
+#include "xkb.c"
+#endif
 #if XRDB_PATCH && !BAR_VTCOLORS_PATCH
 #include "xrdb.c"
 #endif

patch/include.h

@@ -294,6 +294,9 @@
 #if ZOOMSWAP_PATCH
 #include "zoomswap.h"
 #endif
+#if XKB_PATCH
+#include "xkb.h"
+#endif
 #if XRDB_PATCH && !BAR_VTCOLORS_PATCH
 #include "xrdb.h"
 #endif

patch/ipc.c

@@ -9,6 +9,15 @@ handlexevent(struct epoll_event *ev)
 		XEvent ev;
 		while (running && XPending(dpy)) {
 			XNextEvent(dpy, &ev);
+			#if XKB_PATCH
+			/* Unfortunately the xkbEventType is not constant hence it can't be part of the
+			 * normal event handler below */
+			if (ev.type == xkbEventType) {
+				xkbeventnotify(&ev);
+				continue;
+			}
+			#endif // XKB_PATCH
+
 			if (handler[ev.type]) {
 				handler[ev.type](&ev); /* call handler */
 				ipc_send_events(mons, &lastselmon, selmon);

patch/xkb.c

@@ -0,0 +1,67 @@
+static XkbInfo xkbGlobal;
+static XkbInfo *xkbSaved = NULL;
+
+static XkbInfo *
+createxkb(Window w)
+{
+	XkbInfo *xkb;
+
+	xkb = malloc(sizeof *xkb);
+	if (xkb == NULL)
+		die("fatal: could not malloc() %u bytes\n", sizeof *xkb);
+	xkb->group = xkbGlobal.group;
+	xkb->w = w;
+	xkb->next = xkbSaved;
+	if (xkbSaved != NULL)
+		xkbSaved->prev = xkb;
+	xkb->prev = NULL;
+	xkbSaved = xkb;
+
+	return xkb;
+}
+
+XkbInfo *
+findxkb(Window w)
+{
+	XkbInfo *xkb;
+	for (xkb = xkbSaved; xkb != NULL; xkb = xkb->next)
+		if (xkb->w == w)
+			return xkb;
+	return NULL;
+}
+
+void
+xkbeventnotify(XEvent *e)
+{
+	XkbEvent *ev;
+
+	ev = (XkbEvent *) e;
+	switch (ev->any.xkb_type) {
+	case XkbStateNotify:
+		xkbGlobal.group = ev->state.locked_group;
+		if (selmon != NULL && selmon->sel != NULL)
+			selmon->sel->xkb->group = xkbGlobal.group;
+		drawbars();
+		break;
+	}
+}
+
+/* xkb bar module */
+int
+width_xkb(Bar *bar, BarArg *a)
+{
+	return TEXTW(xkb_layouts[xkbGlobal.group]);
+}
+
+int
+draw_xkb(Bar *bar, BarArg *a)
+{
+	drw_text(drw, a->x, a->y, a->w, a->h, lrpad / 2, xkb_layouts[xkbGlobal.group], 0, False);
+	return 1;
+}
+
+int
+click_xkb(Bar *bar, Arg *arg, BarArg *a)
+{
+	return ClkXKB;
+}

patch/xkb.h

@@ -0,0 +1,7 @@
+static XkbInfo *createxkb(Window w);
+static XkbInfo *findxkb(Window w);
+static void xkbeventnotify(XEvent *e);
+
+static int width_xkb(Bar *bar, BarArg *a);
+static int draw_xkb(Bar *bar, BarArg *a);
+static int click_xkb(Bar *bar, Arg *arg, BarArg *a);