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80 lines
2.8 KiB
Haskell
80 lines
2.8 KiB
Haskell
{-# LANGUAGE ViewPatterns #-}
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-----------------------------------------------------------------------------
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-- |
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-- Module : XMonad.Actions.RotSlaves
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-- Description : Rotate all windows except the master window and keep the focus in place.
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-- Copyright : (c) Hans Philipp Annen <haphi@gmx.net>, Mischa Dieterle <der_m@freenet.de>
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-- License : BSD3-style (see LICENSE)
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--
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-- Maintainer : Hans Philipp Annen <haphi@gmx.net>
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-- Stability : stable
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-- Portability : unportable
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--
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-- Rotate all windows except the master window and keep the focus in
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-- place.
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-----------------------------------------------------------------------------
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module XMonad.Actions.RotSlaves (
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-- $usage
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rotSlaves', rotSlavesUp, rotSlavesDown,
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rotAll', rotAllUp, rotAllDown,
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-- * Generic list rotations
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-- $generic
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rotUp, rotDown
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) where
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import XMonad
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import XMonad.StackSet
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import XMonad.Prelude
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-- $usage
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--
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-- To use this module, import it with:
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--
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-- > import XMonad.Actions.RotSlaves
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--
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-- and add whatever keybindings you would like, for example:
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--
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-- > , ((modm .|. shiftMask, xK_Tab ), rotSlavesUp)
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--
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-- This operation will rotate all windows except the master window,
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-- while the focus stays where it is. It is useful together with the
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-- TwoPane layout (see "XMonad.Layout.TwoPane").
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--
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-- For detailed instructions on editing your key bindings, see
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-- <https://xmonad.org/TUTORIAL.html#customizing-xmonad the tutorial>.
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-- | Rotate the windows in the current stack, excluding the first one
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-- (master).
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rotSlavesUp,rotSlavesDown :: X ()
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rotSlavesUp = windows $ modify' (rotSlaves' rotUp)
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rotSlavesDown = windows $ modify' (rotSlaves' rotDown)
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-- | The actual rotation, as a pure function on the window stack.
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rotSlaves' :: ([a] -> [a]) -> Stack a -> Stack a
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rotSlaves' _ s@(Stack _ [] []) = s
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rotSlaves' f (Stack t [] rs) = Stack t [] (f rs) -- Master has focus
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rotSlaves' f s@(Stack _ ls _ ) = Stack t' (reverse revls') rs' -- otherwise
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where (notEmpty -> master :| ws) = integrate s
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(revls', notEmpty -> t' :| rs') = splitAt (length ls) (master:f ws)
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-- | Rotate all the windows in the current stack.
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rotAllUp,rotAllDown :: X ()
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rotAllUp = windows $ modify' (rotAll' rotUp)
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rotAllDown = windows $ modify' (rotAll' rotDown)
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-- | The actual rotation, as a pure function on the window stack.
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rotAll' :: ([a] -> [a]) -> Stack a -> Stack a
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rotAll' f s = Stack r (reverse revls) rs
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where (revls, notEmpty -> r :| rs) = splitAt (length (up s)) (f (integrate s))
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-- $generic
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-- Generic list rotations such that @rotUp [1..4]@ is equivalent to
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-- @[2,3,4,1]@ and @rotDown [1..4]@ to @[4,1,2,3]@. They both are
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-- @id@ for null or singleton lists.
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rotUp :: [a] -> [a]
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rotUp l = drop 1 l ++ take 1 l
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rotDown :: [a] -> [a]
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rotDown = reverse . rotUp . reverse
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