[tabulous] Improve

I've attached a patch file which improves on the recently added
tabulous lib a lot, using it will require a bit more config-end logic,
but it's much more powerful and allows for things such as tabbars and
autotabbing.

List of changes:
* [awful] Add awful.hooks.userhook_create and
awful.hooks.userhook_call so external libs can easily add their own
hooks (tabulous uses these)
* Tabulous now uses a tabindex system, instead of a messy circular
table, every set of tabs is now a tabbed view, this is more practical
and allows for the same order to be retained even if the focus shifts
(otherwise, the currently focussed tag would always be the first one
in the tabbar)
* Tabulous now exports a number of extra functions that will help you
in managing your tabs efficiently
* Tabulous now has an autotab_start() function you can call
(preferably right after the require so any other hooks you may have
set up won't interfere with it), when this is on, any newly created
windows will automatically be tabbed into the current tabbed view if
you have one selected (if the focussed window is not part of a tabbed
view, tabulous will do nothing)
* Tabulous bugfixes

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

awesomerc.lua.in

@@ -2,8 +2,6 @@
 
 -- Include awesome library, with lots of useful function!
 require("awful")
--- Include another library, which defines useful tabular system
-require("tabulous")
 
 -- {{{ Colors and fonts
 awesome.font_set("sans 8")
@@ -176,11 +174,6 @@ keybinding.new({ modkey, "Shift" }, "space", function () awful.layout.inc(layout
 
 -- Menu
 keybinding.new({ modkey }, "F1", function () awful.menu("Run: ", mymenubox, awful.spawn) end):add()
-
--- Tabulous, tab manipulation
-keybinding.new({ modkey, "Control" }, "y", function () tabulous.tab(awful.client.next(1)) end):add()
-keybinding.new({ modkey, "Shift" }, "y", tabulous.untab):add()
-keybinding.new({ modkey }, "y", tabulous.focusnext):add()
 -- }}}
 
 -- {{{ Hooks

awful.lua

@@ -17,6 +17,7 @@ end
 -- Grab environment we need
 local ipairs = ipairs
 local pairs = pairs
+local unpack = unpack
 local awesome = awesome
 local screen = screen
 local client = client
@@ -26,8 +27,6 @@ local os = os
 local table = table
 local hooks = hooks
 local keygrabber = keygrabber
-local print = print
-local table = table
 
 -- Reset env
 setfenv(1, P)
@@ -303,6 +302,24 @@ end
 P.hooks = {}
 P.myhooks = {}
 
+-- Create a new userhook (for external libs)
+local function userhook_create(name)
+    P.myhooks[name] = {}
+    P.hooks[name] = function (f)
+        table.insert(P.myhooks[name], {callback = f})
+    end
+end
+
+-- Call a created userhook (for external libs
+local function userhook_call(name, args)
+    for i,o in pairs(P.myhooks[name]) do
+       P.myhooks[name][i]['callback'](unpack(args))
+    end
+end
+
+P.hooks['userhook_create'] = userhook_create
+P.hooks['userhook_call'] = userhook_call
+
 for name, hook in pairs(hooks) do
     if name ~= 'timer' then
         P.hooks[name] = function (f)

tabulous.lua

@@ -1,8 +1,11 @@
------------------------------------------------
+----------------------------------------------------
---   tabulous: Fabulous tabs for awesome     --
+--      tabulous: Fabulous tabs for awesome       --
---                                           --
+--                                                --
--- © 2008 Julien Danjou <julien@danjou.info> --
+-- © 2008 Julien Danjou <julien@danjou.info>      --
------------------------------------------------
+-- © 2008 Lucas de Vries <lucasdevries@gmail.com> --
+----------------------------------------------------
+
+require('awful')
 
 --------------------
 -- Module loading --
@@ -18,125 +21,218 @@ end
 local client = client
 local table = table
 local pairs = pairs
-local rawset = rawset
+local awful = awful
-local setmetatable = setmetatable
 
 -- Reset env
 setfenv(1, P)
 
--- The tab datastructure.
--- It contains keys which are clients. If a c1 is a client,
--- then if tabbed[c1] exists it must contains a client c2.
--- And if so, tabbed[c2] must contain c1.
--- It's cycling i.e. tabbed[c1] = c2, tabbed[c2] = c3, tabbed[c3] = c1
 local tabbed = {}
 
--- Define a special index method.
+awful.hooks.userhook_create('tabbed')
--- This is useful because we need to compare clients with __eq() to be sure
+awful.hooks.userhook_create('untabbed')
--- that the key are identical. Otherwise Lua assume that each object is different.
+awful.hooks.userhook_create('tabdisplay')
-local function tabbed_index(table, key)
+awful.hooks.userhook_create('tabhide')
-    for k, v in pairs(table) do
-        if k == key then
-            return v
-        end
-    end
-    return nil
-end
-
--- Same as tabbed_index, cheat!
-local function tabbed_newindex(table, key, value)
-    for k, v in pairs(table) do
-        if k == key then
-            rawset(table, k, value)
-            return
-        end
-    end
-    rawset(table, key, value)
-end
-
--- Set the metatable for tabbed
-setmetatable(tabbed, { __index = tabbed_index, __newindex = tabbed_newindex })
 
 ---------------
 -- Functions --
 ---------------
 
--- Get the next tab
+-- Find the key in a table
-local function client_nexttab(s)
+local function findkey(table, cl)
-    local sel = s or client.focus_get()
+    for i, c in pairs(table) do
-    if sel and tabbed[sel] then
+        if c == cl then
-        return tabbed[sel]
+            return i
-    end
-end
-
--- Get the previous tab
-local function client_prevtab(c, stopc)
-    local sel = c or client.focus_get()
-    local stop = stopc or sel
-    if sel and tabbed[sel] then
-        if stop == tabbed[sel] then
-            return sel
-        else
-            return client_prevtab(tabbed[sel], stop)
         end
     end
+    return nil
 end
 
--- Tab a client with another one
+-- Swap which tab is displayed
-local function client_tab(c1, s)
+local function client_display(tabindex, cl)
-    local sel = s or client.focus_get()
+    local p = tabbed[tabindex][1]
-    if c1 and sel and c1 ~= sel then
+    
-        if tabbed[c1] then
+    if cl and p ~= cl then
-            tabbed[sel] = tabbed[c1]
+        cl:unhide()
-            tabbed[c1] = sel
+        cl:swap(p)
-        elseif tabbed[sel] then
+        p:hide()
-            tabbed[c1] = tabbed[sel]
+        cl:focus_set()
-            tabbed[sel] = c1
+
-        else
+        tabbed[tabindex][1] = cl
-            tabbed[c1] = sel
+
-            tabbed[sel] = c1
+        awful.hooks.userhook_call('tabhide', {p})
+        awful.hooks.userhook_call('tabdisplay', {cl})
+    end
+end
+
+-- Check if the client is in the given tabindex
+local function client_in_tabindex(tabindex, cl)
+    local c = cl or client.focus_get()
+    return findkey(tabbed[tabindex], c)
+end
+
+-- Find the tab index or return nil if not tabbed
+local function client_find_tabindex(cl)
+    local c = cl or client.focus_get()
+
+    for tabindex, tabdisplay in pairs(tabbed) do
+        -- Loop through all tab displays
+        local me = client_in_tabindex(tabindex, c)
+
+        if me ~= nil then
+            return tabindex 
         end
-    c1:hide()
+    end
+
+    return nil
+end
+
+-- Create a new tabbed display with client as the master
+local function client_tab_create(cl)
+    local c = cl or client.focus_get()
+
+    table.insert(tabbed, {
+        c, -- Window currently being displayed
+        { c } -- List of windows in tabbed display
+    })
+
+    awful.hooks.userhook_call('tabbed', {c})
+    return client_find_tabindex(c)
+end
+
+-- Add a client to a tabbed display
+local function client_tab(tabindex, cl)
+    local c = cl or client.focus_get()
+
+    if tabbed[tabindex] ~= nil and client_find_tabindex(c) == nil then
+        table.insert(tabbed[tabindex][2], c)
+        client_display(tabindex, c)
+
+        awful.hooks.userhook_call('tabbed', {c})
     end
 end
 
--- Untab a client
+-- Get the next client in a tabdisplay
-local function client_untab(c)
+local function client_next(tabindex, cl)
-    local sel = c or client.focus_get()
+    local c = cl or tabbed[tabindex][1]
-    if sel and tabbed[sel] then
+
-        local p = client_prevtab(sel)
+    local i = findkey(tabbed[tabindex][2], c)
-        tabbed[p] = tabbed[sel]
+
-        tabbed[sel] = nil
+    if i == nil then
-        p:unhide()
+        return nil
+    end
+
+    if tabbed[tabindex][2][i+1] == nil then
+        return tabbed[tabindex][2][1]
+    else
+        return tabbed[tabindex][2][i+1]
     end
 end
 
--- Focus the next tab
+-- Get the previous client in a tabdisplay
-local function client_focusnexttab(s)
+local function client_prev(tabindex, cl)
-    local sel = s or client.focus_get()
+    local c = cl or tabbed[tabindex][1]
-    local n = client_nexttab(sel)
+
-    if n then
+    local i = findkey(tabbed[tabindex][2], c)
-        sel:hide()
+
-        n:unhide()
+    if i == nil then
-        n:focus_set()
+        return nil
+    end
+
+    if tabbed[tabindex][2][i-1] == nil then
+        return tabbed[tabindex][2][table.maxn(tabbed[tabindex][2])]
+    else
+        return tabbed[tabindex][2][i-1]
     end
 end
 
--- Focus the previous tab
+-- Remove a client from a tabbed display
-local function client_focusprevtab(s)
+local function client_untab(cl)
-    local sel = s or client.focus_get()
+    local c = cl or client.focus_get()
-    local p = client_prevtab(sel)
+    local tabindex = client_find_tabindex(c)
-    if p then
+    if tabindex == nil then return false end
-        sel:hide()
+
-        p:unhide()
+    local cindex = findkey(tabbed[tabindex][2], c)
-        p:focus_set()
+
+    if tabbed[tabindex][1] == c then
+        client_display(tabindex, client_next(tabindex, c))
+    end
+
+    table.remove(tabbed[tabindex][2], cindex)
+
+    if table.maxn(tabbed[tabindex][2]) == o then
+        -- Table is empty now, remove the tabbed display
+        table.remove(tabbed, tabindex)
+    end
+
+    c:unhide()
+    awful.hooks.userhook_call('untabbed', {c})
+end
+
+-- Untab all clients in a tabbed display
+local function client_untab_all(tabindex)
+    for i,c in pairs(tabbed[tabindex][2]) do
+        awful.hooks.userhook_call('untabbed', {c})
+    end
+
+    if tabbed[tabindex] ~= nil then
+        table.remove(tabbed, tabindex)
     end
 end
 
+-- Get all clients on a tabbed display
+local function client_get_clients(tabindex)
+    return tabbed[tabindex][2]
+end
+
+-- Get the displayed client on a tabbed display
+local function client_get_displayed(tabindex)
+    return tabbed[tabindex][1]
+end
+
+-- Get a client by tab number
+local function client_get_position(tabindex, pos)
+    if tabbed[tabindex] == nil then return nil end
+    return tabbed[tabindex][2][pos]
+end
+
+-- Start autotabbing, this automatically
+-- tabs new clients when the current client
+-- is tabbed
+local function autotab_start()
+    awful.hooks.manage(function (c)
+        local sel = client.focus_get()
+        local index = client_find_tabindex(sel)
+
+        if index ~= nil then
+            -- Currently focussed client is tabbed, 
+            -- add the new window to the tabbed display
+            client_tab(index, c)
+        end
+    end)
+end
+
+-- Set up hook so we don't leave lost hidden clients
+awful.hooks.unmanage(function (c) client_untab(c) end)
+
+P.findkey = findkey
+P.display = client_display
+P.tabindex_check = client_in_tabindex
+P.tabindex_get = client_find_tabindex
+
+P.tab_create = client_tab_create
 P.tab = client_tab
 P.untab = client_untab
-P.focusnext = client_focusnexttab
+P.untab_all = client_untab_all
-P.focusprev = client_focusprevtab
+
-P.next = client_nexttab
+P.next = client_next
-P.prev = client_prevtab
+P.prev = client_prev
+
+P.clients_get = client_get_clients
+P.displayed_get = client_get_displayed
+P.position_get = client_get_position
+
+P.autotab_start = autotab_start
+
+P.tabbed = tabbed
+
 return P