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  1. subsequences :: [a] -> [[a]]

    xmonad-contrib XMonad.Prelude

    The subsequences function returns the list of all subsequences of the argument.

    Laziness

    subsequences does not look ahead unless it must: 
    >>> take 1 (subsequences undefined)
[[]]

>>> take 2 (subsequences ('a' : undefined))
["","a"]

    Examples

    >>> subsequences "abc"
["","a","b","ab","c","ac","bc","abc"]
    This function is productive on infinite inputs: 
    >>> take 8 $ subsequences ['a'..]
["","a","b","ab","c","ac","bc","abc"]

  2. parseKeySequence :: forall (l :: Type -> Type) . XConfig l -> Parser [(KeyMask, KeySym)]

    xmonad-contrib XMonad.Util.EZConfig

    Parse a sequence of key combinations separated by spaces, e.g. "M-c x C-S-2" (mod+c, x, ctrl+shift+2).

  3. readKeySequence :: forall (l :: Type -> Type) . XConfig l -> String -> Maybe (NonEmpty (KeyMask, KeySym))

    xmonad-contrib XMonad.Util.EZConfig

    Parse a sequence of keys, returning Nothing if there is a parse failure (no parse, or ambiguous parse).

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