[Xmonad] Configurable tiling algos

[Donald Bruce Stewart]

Regarding configurable tiling, a simple strategy would be to have 
user-specified tiling functions available from Config.hs, of the type

    tile :: Rational -> Rectangle -> [Window] -> [(Window, Rectangle)]
    type Tiler =Rational -> Rectangle -> [Window] -> [(Window, Rectangle)]

so,

    myTile :: [Tiler]
    myTile = [someTileAlgo
             ,someOtherAlgo
             ]

These functions are then added to the list of algos to cycle through in
mod-space, and would allow custom pure functions.

David, I suspect you actually want 'tile' to live in X, so you can do
window name lookups and so on?

Other than generalising the type a bit, how does this sound, as an
approach to extending the tiling algo set with custom user-written
methods.

-- Don