Add client_set_master command

The function swaps selected client with the first one (master).

src/client.c

@@ -1628,3 +1628,27 @@ uicb_client_ignore_tag(uicb_t cmd)
 
      return;
 }
+
+/** Set current client as master
+  *\para cmd uicb_t type unused
+*/
+void
+uicb_client_set_master(uicb_t cmd)
+{
+     Client *c;
+     (void)cmd;
+     
+     /* get the first client */
+     screen_get_sel();
+     if(!sel || ishide(sel, selscreen))
+          return;
+     
+     for(c = clients; c && ishide(c, selscreen); c = c->next);
+     
+     if (c && c != sel)
+     {
+          client_swap(c, sel); 
+          client_focus(c);
+     }
+     return;
+}

src/config.c

@@ -50,6 +50,7 @@ const func_name_list_t func_list[] =
      {"client_move",              uicb_client_move },
      {"client_resize",            uicb_client_resize },
      {"client_ignore_tag",        uicb_client_ignore_tag },
+     {"client_set_master",        uicb_client_set_master },
      {"toggle_max",               uicb_togglemax },
      {"layout_next",              uicb_layout_next },
      {"layout_prev",              uicb_layout_prev },

src/wmfs.h

@@ -201,6 +201,7 @@ void uicb_ignore_next_client_rules(uicb_t cmd);
 void uicb_clientlist(uicb_t cmd);
 Bool uicb_checkclist(uicb_t);
 void uicb_client_ignore_tag(uicb_t);
+void uicb_client_set_master(uicb_t);
 
 /* ewmh.c */
 void ewmh_init_hints(void);