Cycle.patch

diff --git a/dwm.c b/dwm.c
index 8b67cea..3a6c9ef 100644
--- a/dwm.c
+++ b/dwm.c
@@ -254,6 +254,9 @@ static int xerror(Display *dpy, XErrorEvent *ee);
 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 static void zoom(const Arg *arg);
+static void cycle(const Arg *arg);
+static int shifttag(int dist);
+static void tagcycle(const Arg *arg);
 static void bstack(Monitor *m);
 static void runorraise(const Arg *arg);

@@ -2167,6 +2170,30 @@ zoom(const Arg *arg) {
     spawn(arg);
 }

+shifttag(int dist) {
+   int seltags = selmon->tagset[selmon->seltags] & TAGMASK;
+
+   if(dist > 0) // left circular shift
+       seltags = (seltags << dist) | (seltags >> (LENGTH(tags) - dist));
+   else // right circular shift
+       seltags = (seltags >> (- dist)) | (seltags << (LENGTH(tags) + dist));
+
+   return seltags;
+}
+
+void
+cycle(const Arg *arg) {
+   const Arg a = { .i = shifttag(arg->i) };
+   view(&a);
+}
+
+void
+tagcycle(const Arg *arg) {
+   const Arg a = { .i = shifttag(arg->i) };
+   tag(&a);
+   view(&a);
+}
+
 int main(int argc, char *argv[]) {
     if(argc == 2 && !strcmp("-v", argv[1]))
         die("dwm-"VERSION", © 2006-2011 dwm engineers, see LICENSE for details\n");