add uicb_focus_history and bind with -1 to Mod4+Tab by default

awesomerc

@@ -176,6 +176,13 @@ keys
         command = "client_focusprev"
     }
     key
+    {
+        modkey = {"Mod4"}
+        key = "Tab"
+        command = "focus_history"
+        arg = "-1"
+    }
+    key
     {
         modkey = {"Mod4", "Shift"}
         key = "j"

focus.c

@@ -21,6 +21,7 @@
 
 #include "util.h"
 #include "tag.h"
+#include "layout.h"
 #include "focus.h" 
 
 static FocusList *
@@ -103,4 +104,30 @@ focus_get_latest_client_for_tag(FocusList *head, TagClientLink *tc, Tag *t)
     return NULL;
 }
 
+void
+uicb_focus_history(awesome_config *awesomeconf,
+                   int screen,
+                   const char *arg)
+{
+    int i;
+    FocusList *fl = awesomeconf->focus;
+    Tag *curtag = get_current_tag(awesomeconf->screens[screen]);
+
+    if(arg)
+    {
+        i = atoi(arg);
+
+        if(i < 0)
+        {
+            for(; fl && i < 0; fl = fl->prev)
+                if(is_client_tagged(awesomeconf->screens[screen].tclink,
+                                    fl->client,
+                                    curtag))
+                    i++;
+            if(fl)
+                focus(fl->client, True, awesomeconf, screen);
+        }
+    }
+}
+
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99

focus.h

@@ -28,5 +28,7 @@ void focus_add_client(FocusList **, Client *);
 void focus_delete_client(FocusList **, Client *);
 Client * focus_get_latest_client_for_tag(FocusList *, TagClientLink *, Tag *);
 
+UICB_PROTO(uicb_focus_history);
+
 #endif
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99

uicb.c

@@ -28,6 +28,7 @@
 #include "layout.h"
 #include "mouse.h"
 #include "statusbar.h"
+#include "focus.h"
 #include "layouts/tile.h"
 
 const NameFuncLink UicbList[] =
@@ -75,6 +76,8 @@ const NameFuncLink UicbList[] =
     /* mouse.c */
     {"client_movemouse", uicb_client_movemouse},
     {"client_resizemouse", uicb_client_resizemouse},
+    /* focus.c */
+    {"focus_history", uicb_focus_history},
     {NULL, NULL}
 };