    -----------------------------------------------------------------------------
    -- |
    -- Module      :  XMonad.Doc.Configuring
    -- Copyright   :  (C) 2007 Don Stewart and Andrea Rossato
    -- License     :  BSD3
    --
    -- Maintainer  :  andrea.rossato@unibz.it
    -- Stability   :  unstable
    -- Portability :  portable
    --
    -- This is a brief tutorial that will teach you how to create a
    -- basic xmonad configuration.
    --
    -- For more detailed instructions on extending xmonad with the
    -- xmonad-contrib library, see "XMonad.Doc.Extending".
    --
    -----------------------------------------------------------------------------

    module XMonad.Doc.Configuring
        (
        -- * Configuring xmonad
        -- $configure

        -- * A simple example
        -- $example

        -- * Checking whether your xmonad.hs is correct
        -- $check

        -- * Loading your configuration
        -- $load

        ) where

    --------------------------------------------------------------------------------
    --
    --  Configuring Xmonad
    --
    --------------------------------------------------------------------------------

    {- $configure
    #Configuring_xmonad#
    xmonad can be configured by creating and editing the Haskell file:

    >    ~/.xmonad/xmonad.hs

    If this file does not exist, xmonad will simply use default settings;
    if it does exist, xmonad will use whatever settings you specify.  Note
    that this file can contain arbitrary Haskell code, which means that
    you have quite a lot of flexibility in configuring xmonad.

    HISTORICAL NOTE regarding upgrading from versions (< 0.5) of xmonad
    or using old documentation:

    xmonad-0.5 delivered a major change in the way xmonad is configured.  Prior
    to version 0.5, configuring xmonad required editing a source file called
    Config.hs, manually recompiling xmonad, and then restarting.  From
    version 0.5 onwards, however, you should NOT edit this file or manually
    compile with ghc --make.  All you have to do is edit xmonad.hs and restart
    with @mod-q@; xmonad does the recompiling itself. The format of the
    configuration file also changed with version 0.5; enabling simpler and
    much shorter xmonad.hs files that only require listing those settings which
    are different from the defaults.

    While the complicated template.hs (man/xmonad.hs) files listing all default
    settings are still provided for reference, once you wish to make substantial
    changes to your configuration, the template.hs style configuration is not
    recommended. It is fine to use top-level definitions to organize your
    xmonad.hs, but wherever possible it is better to leave out settings that
    simply duplicate defaults.
    -}

    {- $example
    #A_simple_example#

    Here is a basic example, which starts with the default xmonad
    configuration and overrides the border width, default terminal, and
    some colours:

    >    --
    >    -- An example, simple ~/.xmonad/xmonad.hs file.
    >    -- It overrides a few basic settings, reusing all the other defaults.
    >    --
    >
    >    import XMonad
    >
    >    main = xmonad $ defaultConfig
    >        { borderWidth        = 2
    >        , terminal           = "urxvt"
    >        , normalBorderColor  = "#cccccc"
    >        , focusedBorderColor = "#cd8b00" }

    This will run \'xmonad\', the window manager, with your settings
    passed as arguments.

    Overriding default settings like this (using \"record update
    syntax\"), will yield the shortest config file, as you only have to
    describe values that differ from the defaults.

    As an alternative, you can copy the template @xmonad.hs@ file (found
    either in the @man@ directory, if you have the xmonad source, or on
    the xmonad wiki config archive at
    <http://haskell.org/haskellwiki/Xmonad/Config_archive>)
    into your @~\/.xmonad\/@ directory.  This template file contains all
    the default settings spelled out, and you should be able to simply
    change the ones you would like to change.

    To see what fields can be customized beyond the ones in the example
    above, the definition of the 'XMonad.Core.XConfig' data structure can
    be found in "XMonad.Core".

    -}

    {- $check
    #Checking_whether_your_xmonad.hs_is_correct#

    After changing your configuration, it is a good idea to check that it
    is syntactically and type correct.  You can do this easily by using an xmonad
    flag:

    >    $ xmonad --recompile
    >    $

    If there is no output, your xmonad.hs has no errors.  If there are errors, they
    will be printed to the console.  Patch them up and try again.

    Note, however, that if you skip this step and try restarting xmonad
    with errors in your xmonad.hs, it's not the end of the world; xmonad
    will simply display a window showing the errors and continue with the
    previous configuration settings. (This assumes that you have the
    \'xmessage\' utility installed; you probably do.)

    -}

    {- $load
    #Loading_your_configuration#

    To get xmonad to use your new settings, type @mod-q@. (Remember, the
    mod key is \'alt\' by default, but you can configure it to be
    something else, such as your Windows key if you have one.) xmonad will
    attempt to compile this file, and run it.  If everything goes well,
    xmonad will seamlessly restart itself with the new settings, keeping
    all your windows, layouts, etc. intact.  (If you change anything
    related to your layouts, you may need to hit @mod-shift-space@ after
    restarting to see the changes take effect.)  If something goes wrong,
    the previous (default) settings will be used.  Note this requires that
    GHC and xmonad are in the @$PATH@ in the environment from which xmonad
    is started.

    -}