awful.autofocus: import and use

Signed-off-by: Julien Danjou <julien@danjou.info>

awesomerc.lua.in

@@ -1,5 +1,6 @@
 -- Standard awesome library
 require("awful")
+require("awful.autofocus")
 -- Theme handling library
 require("beautiful")
 -- Notification library
@@ -377,15 +378,4 @@ client.add_signal("manage", function (c, startup)
     -- Honor size hints: if you want to drop the gaps between windows, set this to false.
     -- c.size_hints_honor = false
 end)
-
--- Hook function to execute when switching tag selection.
-awful.hooks.tags.register(function (screen, tag, view)
-    -- Give focus to the latest client in history if no window has focus
-    -- or if the current window is a desktop or a dock one.
-    if not client.focus or not client.focus:isvisible() then
-        local c = awful.client.focus.history.get(screen, 0)
-        if c then client.focus = c end
-    end
-end)
-
 -- }}}

lib/awful/autofocus.lua.in

@@ -0,0 +1,31 @@
+---------------------------------------------------------------------------
+-- @author Julien Danjou <julien@danjou.info>
+-- @copyright 2009 Julien Danjou
+-- @release @AWESOME_VERSION@
+---------------------------------------------------------------------------
+
+local client = client
+local screen = screen
+local aclient = require("awful.client")
+local atag = require("awful.tag")
+
+--- When loaded, this module makes sure that there's always a client that will have focus
+-- on event such as tag switching, client unmanaging, etc.
+module("awful.autofocus")
+
+-- Give focus on tag selection change.
+-- @param obj An object that should have a .screen property.
+local function check_focus(obj)
+    if not client.focus or not client.focus:isvisible() then
+        local c = aclient.focus.history.get(obj.screen, 0)
+        if c then client.focus = c end
+    end
+end
+
+atag.attached_add_signal(nil, "property::selected", check_focus)
+client.add_signal("unmanage", check_focus)
+client.add_signal("new", function(c)
+    c:add_signal("untagged", check_focus)
+end)
+
+-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80