tabulous: made tabulous tab aware

here is a patch that add tag support for tabulous, so now when a windows is
both tabbed and multiple tagged, it behave as expected (at least by me, that
is do not hide a window in a tag where it is not tabbed)

We can still mess up the tabs by clicking on the window name (in the taskbar)
but this will (I hope) be fixed in another patch.

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

lib/tabulous.lua.in

@@ -14,7 +14,10 @@ local awful = require('awful')
 --- tabulous: fabulous tabs for awesome
 module("tabulous")
 
-local tabbed = {}
+local tabbed_tags = {} -- all tab tables, indexed by tab
+local tabbed = {}      -- the current tag tab table
+
+local active_tag
 
 -- Hook creation
 awful.hooks.user.create('tabbed')
@@ -249,7 +252,48 @@ function autotab_start()
     end)
 end
 
+--- Update the tabbing when current tags changes, by unactivating
+-- all tabs that are not in the current tag (and activating the good one).
+local function update_tabbing()
+    -- do nothing if nothing changed
+    if active_tag == awful.tag.selected().name then return end
+
+    -- needed for initialisation
+    active_tag = active_tag or awful.tag.selected().name
+
+    -- save the tabbed list for the old active tag
+    tabbed_tags[active_tag] = tabbed
+
+    -- update the active tag and switch to the new tabbed list
+    active_tag = awful.tag.selected().name
+    tabbed = tabbed_tags[active_tag] or {}
+
+    -- update show/hide on the clients
+    for tag,tabs in pairs(tabbed_tags) do
+        if tag == active_tag then
+            -- hide all clients that are not tab masters
+            for i,tab in pairs(tabs) do
+                for i,c in pairs(tab[2]) do
+                    c.hide = true
+                end
+                tab[1].hide = false
+            end
+        else
+            -- unhide all clients
+            for i,tab in pairs(tabs) do
+                for i,c in pairs(tab[2]) do
+                    c.hide = false
+                end
+            end
+        end
+    end
+end
+
+-- Update the tabbing when the tags changes
+awful.hooks.arrange.register(update_tabbing)
+
 -- Set up hook so we don't leave lost hidden clients
 awful.hooks.unmanage.register(untab)
 
+
 -- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80