C.Desktop doc explaining common desktop config customizations

To close http://code.google.com/p/xmonad/issues/detail?id=174

XMonad/Config/Desktop.hs

@@ -12,10 +12,45 @@
 --
 -- This module provides a config suitable for use with a desktop
 -- environment such as KDE or GNOME.
-
+-----------------------------------------------------------------------------
 module XMonad.Config.Desktop (
+
+    -- | Several basic integration settings are common to all of xmonad\'s
+    -- desktop integration configurations. The specific desktop environment
+    -- (DE) modules like "XMonad.Config.Gnome" use this module\'s
+    -- @desktopConfig@ to set up basic communication between xmonad and
+    -- the DE via a subset of the Extended Window Manager Hints (EWMH)
+    -- specification. Extra xmonad settings unique to specific DE\'s are
+    -- added by overriding or modifying @desktopConfig@ fields in the
+    -- same way that @defaultConfig@ is customized in @~/.xmonad/xmonad.hs@.
+    --
+    -- For more information about EWMH see:
+    --
+    -- <http://standards.freedesktop.org/wm-spec/wm-spec-latest.html>
+    --
+    -- See also: "XMonad.Hooks.EwmhDesktops", "XMonad.Hooks.ManageDocks",
+    -- "XMonad.Util.EZConfig".
+
+    -- * Usage
+    -- $usage
+
     desktopConfig,
+
+    -- * Customizing a desktop config
+    -- $customizing
+
+    -- ** Modifying layouts, manageHook, or key bindings
+    -- $layouts
     desktopLayoutModifiers
+
+    -- ** Modifying the logHook
+    -- $logHook
+
+    -- ** Modifying the handleEventHook
+    -- $eventHook
+
+    -- ** Modifying the startupHook
+    -- $startupHook
     ) where
 
 import XMonad
@@ -26,6 +61,111 @@ import XMonad.Util.Cursor
 
 import qualified Data.Map as M
 
+-- $usage
+-- While this document describes how to configure xmonad, you also need
+-- to set up your Desktop Environment (DE) and display manager to use
+-- xmonad as its window manager. For DE and distro specific tips on
+-- how to do so, see the xmonad wiki:
+--
+-- <http://haskell.org/haskellwiki/Xmonad>
+--
+-- To configure xmonad for use with a DE or with DE tools like panels
+-- and pagers, in place of @defaultConfig@ in your @~/.xmonad/xmonad.hs@,
+-- use @desktopConfig@ or one of the other desktop configs from the
+-- @XMonad.Config@ hierarchy. The following setup and customization examples
+-- work the same way for the other desktop configs as for @desktopConfig@.
+-- If you are using a specific DE config, import its module instead, and
+-- use its config in place of @desktopConfig@ in the following examples.
+--
+-- > import XMonad
+-- > import XMonad.Config.Desktop
+-- >
+-- > main = xmonad desktopConfig
+--
+-- @desktopConfig@ is an 'XConfig' that configures xmonad to
+-- ignore and leave room for dock type windows like panels and trays, adds
+-- the default key binding to toggle panel visibility, and activates basic
+-- EWMH support. It also sets a prettier root window mouse pointer.
+
+-- $customizing
+-- To customize a desktop config, modify its fields as is illustrated with
+-- @defaultConfig@ in the \"Extending xmonad\" section of "XMonad.Doc.Extending".
+
+-- $layouts
+-- See also "XMonad.Util.EZConfig" for more options for modifying key bindings.
+-- To add to layouts, manageHook or key bindings use something like the following
+-- to combine your modifications with the desktop config settings:
+--
+-- > import XMonad
+-- > import XMonad.Config.Desktop
+-- > import XMonad.Layout.Tabbed
+-- > import XMonad.Util.EZConfig (additionalKeys)
+-- >
+-- > main =
+-- >   xmonad $ desktopConfig {
+-- >     -- add manage hooks while still ignoring panels and using default manageHooks
+-- >       manageHook = myManageHook <+> manageHook desktopConfig
+-- >
+-- >     -- add a fullscreen tabbed layout that does not avoid covering
+-- >     -- up desktop panels before the desktop layouts
+-- >     , layoutHook = simpleTabbed ||| layoutHook desktopConfig
+-- >     }
+-- >     -- add a screenshot key to the default desktop bindings
+-- >     `additionalKeys` [ ((mod4Mask, xK_F8), spawn "scrot") ]
+--
+-- To replace the desktop layouts with your own choices, but still
+-- allow toggling panel visibility, use 'desktopLayoutModifiers' to
+-- modify your layouts:
+--
+-- >  , layoutHook = desktopLayoutModifiers $ simpleTabbed ||| Tall 1 0.03 0.5
+--
+-- @desktopLayoutModifiers@ modifies a layout to avoid covering docks, panels,
+-- etc. that set the @_NET_WM_STRUT_PARTIAL@ property.
+-- See also "XMonad.Hooks.ManageDocks".
+
+-- $logHook
+-- To add to the logHook while still sending workspace and window information
+-- to DE apps use something like:
+--
+-- >  , logHook = myLogHook >> logHook desktopConfig
+--
+-- Or for more elaborate logHooks you can use @do@:
+--
+-- >  , logHook = do
+-- >        dynamicLogWithPP xmobarPP
+-- >        updatePointer (Relative 0.9 0.9)
+-- >        logHook desktopConfig
+--
+
+-- $eventHook
+-- To customize xmonad\'s event handling while still having it respond
+-- to EWMH events from pagers, task bars, etc. add to your imports:
+--
+-- > import Data.Monoid
+--
+-- and use 'Data.Monoid.mappend' to combine event hooks (right to left application like @\<+\>@)
+--
+-- >  , handleEventHook = mappend myEventHooks (handleEventHook desktopConfig)
+--
+-- or 'Data.Monoid.mconcat' (like @composeAll@)
+--
+-- >  , handleEventHook = mconcat
+-- >        [ myMouseHandler
+-- >        , myMessageHandler
+-- >        , handleEventHook desktopConfig ]
+--
+
+-- $startupHook
+-- To run the desktop startupHook, plus add further actions to be run each
+-- time xmonad starts or restarts, use '>>' to combine actions as in the
+-- logHook example, or something like:
+--
+-- >  , startupHook = do
+-- >        startupHook desktopConfig
+-- >        spawn "xmonad-restart.sh"
+-- >        adjustEvenInput
+--
+
 desktopConfig = defaultConfig
     { logHook    = ewmhDesktopsLogHook
     , layoutHook = desktopLayoutModifiers $ layoutHook defaultConfig
@@ -38,3 +178,4 @@ desktopKeys (XConfig {modMask = modm}) = M.fromList $
     [ ((modm, xK_b), sendMessage ToggleStruts) ]
 
 desktopLayoutModifiers layout = avoidStruts layout
+

XMonad/Config/Gnome.hs

@@ -36,6 +36,8 @@ import System.Environment (getEnvironment)
 -- > import XMonad.Config.Gnome
 -- >
 -- > main = xmonad gnomeConfig
+--
+-- For examples of how to further customize @gnomeConfig@ see "XMonad.Config.Desktop".
 
 gnomeConfig = desktopConfig
     { terminal = "gnome-terminal"

XMonad/Config/Kde.hs

@@ -35,6 +35,8 @@ import qualified Data.Map as M
 --
 -- For KDE 4, replace 'kdeConfig' with 'kde4Config'
 --
+-- For examples of how to further customize @kdeConfig@ see "XMonad.Config.Desktop".
+
 
 kdeConfig = desktopConfig
     { terminal = "konsole"

XMonad/Config/Xfce.hs

@@ -6,7 +6,7 @@
 -- Copyright    : (c) Ivan Miljenovic <Ivan.Miljenovic@gmail.com>
 -- License      : BSD
 --
--- Maintainer   : Ivan Miljenovic <Ivan.Miljenovic@gmail.com>
+-- Maintainer   :  none
 -- Stability    :  unstable
 -- Portability  :  unportable
 --
@@ -32,6 +32,7 @@ import qualified Data.Map as M
 -- >
 -- > main = xmonad xfceConfig
 --
+-- For examples of how to further customize @xfceConfig@ see "XMonad.Config.Desktop".
 
 xfceConfig = desktopConfig
     { terminal = "Terminal"