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|
{-# LANGUAGE DeriveDataTypeable, FlexibleInstances, MultiParamTypeClasses #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Actions.WorkspaceCursors
-- Copyright : (c) 2009 Adam Vogt <vogt.adam@gmail.com>
-- License : BSD
--
-- Maintainer : Adam Vogt
-- Stability : unstable
-- Portability : unportable
--
-- Like "XMonad.Actions.Plane" for an arbitrary number of dimensions.
-----------------------------------------------------------------------------
module XMonad.Actions.WorkspaceCursors
(
-- * Usage
-- $usage
focusDepth
,makeCursors
,toList
,workspaceCursors
,WorkspaceCursors
,getFocus
-- * Modifying the focus
,modifyLayer
,modifyLayer'
,shiftModifyLayer,shiftLayer
-- * Functions to pass to 'modifyLayer'
,focusNth'
,noWrapUp,noWrapDown
-- * Todo
-- $todo
) where
import qualified XMonad.StackSet as W
import XMonad.Actions.FocusNth(focusNth')
import XMonad.Layout.LayoutModifier(ModifiedLayout(..),
LayoutModifier(handleMess, redoLayout))
import XMonad(Typeable, Message, WorkspaceId, X, XState(windowset),
fromMessage, sendMessage, windows, gets)
import Control.Monad((<=<), guard, liftM, liftM2, when)
import Control.Applicative((<$>))
import Data.Foldable(Foldable(foldMap), toList)
import Data.Maybe(fromJust, listToMaybe)
import Data.Monoid(Monoid(mappend, mconcat))
import Data.Traversable(sequenceA)
-- $usage
--
-- Here is an example config:
--
-- > import XMonad
-- > import XMonad.Actions.WorkspaceCursors
-- > import XMonad.Hooks.DynamicLog
-- > import XMonad.Util.EZConfig
-- > import qualified XMonad.StackSet as W
-- >
-- > main = do
-- > x <- xmobar conf
-- > xmonad x
-- >
-- > conf = additionalKeysP defaultConfig
-- > { layoutHook = workspaceCursors myCursors $ layoutHook defaultConfig
-- > , workspaces = toList myCursors } $
-- > [("M-"++shift++control++[k], f direction depth)
-- > | (f,shift) <- zip [modifyLayer,shiftModifyLayer] ["","S-"]
-- > , (direction,control) <- zip [W.focusUp',W.focusDown'] ["C-",""]
-- > , (depth,k) <- zip (reverse [1..focusDepth myCursors]) "asdf"]
-- > ++ moreKeybindings
-- >
-- > moreKeybindings = []
-- >
-- > myCursors = makeCursors $ map (map (\x -> [x])) [ "1234", "abc", "xyz"]
-- > -- myCursors = makeCursors [["wsA","wsB","wsC"],["-alpha-","-beta-","-gamma-"],["x","y"]]
-- $todo
--
-- * Find and document how to raise the allowable length of arguments:
-- restoring xmonad's state results in: @xmonad: executeFile: resource
-- exhausted (Argument list too long)@ when you specify more than about 50
-- workspaces. Or change it such that workspaces are created when you try to
-- view it.
--
-- * Function for pretty printing for DynamicLog that groups workspaces by
-- common prefixes
--
-- * Examples of adding workspaces to the cursors, having them appear multiple
-- times for being able to show jumping to some n'th multiple workspace
-- | makeCursors requires a nonempty string, and each sublist must be nonempty
makeCursors :: [[String]] -> Cursors String
makeCursors [] = error "Workspace Cursors cannot be empty"
makeCursors a = concat . reverse <$> foldl addDim x xs
where x = end $ map return $ head a
xs = map (map return) $ tail a
-- this could probably be simplified, but this true:
-- toList . makeCursors == map (concat . reverse) . sequence . reverse . map (map (:[]))
-- the strange order is used because it makes the regular M-1..9
-- bindings change the prefixes first
addDim :: (Monoid a) => Cursors a -> [a] -> Cursors a
addDim prev prefixes = Cons . fromJust . W.differentiate
$ map ((<$> prev) . mappend) prefixes
end :: [a] -> Cursors a
end = Cons . fromJust . W.differentiate . map End
data Cursors a
= Cons (W.Stack (Cursors a))
| End a deriving (Eq,Show,Read,Typeable)
instance Foldable Cursors where
foldMap f (End x) = f x
foldMap f (Cons (W.Stack x y z)) = foldMap f x `mappend` mconcat (map (foldMap f) $ reverse y ++ z)
instance Functor Cursors where
fmap f (End a) = End $ f a
fmap f (Cons (W.Stack x y z)) = Cons $ W.Stack (fmap f x) (fmap (fmap f) y) (fmap (fmap f) z)
changeFocus :: (Cursors t -> Bool) -> Cursors t -> [Cursors t]
changeFocus p (Cons x) = do
choose <- chFocus p x
foc <- changeFocus p $ W.focus choose
return . Cons $ choose { W.focus = foc }
changeFocus p x = guard (p x) >> return x
chFocus :: (a -> Bool) -> W.Stack a -> [W.Stack a]
chFocus p st = filter (p . W.focus) $ zipWith const (iterate W.focusDown' st) (W.integrate st)
getFocus :: Cursors b -> b
getFocus (Cons x) = getFocus $ W.focus x
getFocus (End x) = x
-- This could be made more efficient, if the fact that the suffixes are grouped
focusTo :: (Eq t) => t -> Cursors t -> Maybe (Cursors t)
focusTo x = listToMaybe . filter ((x==) . getFocus) . changeFocus (const True)
-- | non-wrapping version of 'W.focusUp''
noWrapUp :: W.Stack t -> W.Stack t
noWrapUp (W.Stack t (l:ls) rs) = W.Stack l ls (t:rs)
noWrapUp x@(W.Stack _ [] _ ) = x
-- | non-wrapping version of 'W.focusDown''
noWrapDown :: W.Stack t -> W.Stack t
noWrapDown = reverseStack . noWrapUp . reverseStack
where reverseStack (W.Stack t ls rs) = W.Stack t rs ls
focusDepth :: Cursors t -> Int
focusDepth (Cons x) = 1 + focusDepth (W.focus x)
focusDepth (End _) = 0
descend :: Monad m =>(W.Stack (Cursors a) -> m (W.Stack (Cursors a)))-> Int-> Cursors a-> m (Cursors a)
descend f 1 (Cons x) = Cons `liftM` f x
descend f n (Cons x) | n > 1 = liftM Cons $ descend f (pred n) `onFocus` x
descend _ _ x = return x
onFocus :: (Monad m) => (a1 -> m a1) -> W.Stack a1 -> m (W.Stack a1)
onFocus f st = (\x -> st { W.focus = x}) `liftM` f (W.focus st)
-- | @modifyLayer@ is used to change the focus at a given depth
modifyLayer :: (W.Stack (Cursors String) -> W.Stack (Cursors String)) -> Int -> X ()
modifyLayer f depth = modifyCursors (descend (return . f) depth)
-- | @shiftModifyLayer@ is the same as 'modifyLayer', but also shifts the
-- currently focused window to the new workspace
shiftModifyLayer :: (W.Stack (Cursors String) -> W.Stack (Cursors WorkspaceId))-> Int-> X ()
shiftModifyLayer f = modifyLayer' $ \st -> do
let st' = f st
windows $ W.shift $ getFocus (Cons st')
return st'
-- | @shiftLayer@ is the same as 'shiftModifyLayer', but the focus remains on
-- the current workspace.
shiftLayer :: (W.Stack (Cursors String) -> W.Stack (Cursors WorkspaceId))-> Int-> X ()
shiftLayer f = modifyLayer' $ \st -> do
windows $ W.shift $ getFocus $ Cons $ f st
return st
-- | example usages are 'shiftLayer' and 'shiftModifyLayer'
modifyLayer' :: (W.Stack (Cursors String) -> X (W.Stack (Cursors String))) -> Int -> X ()
modifyLayer' f depth = modifyCursors (descend f depth)
modifyCursors :: (Cursors String -> X (Cursors String)) -> X ()
modifyCursors = sendMessage . ChangeCursors . (liftM2 (>>) updateXMD return <=<)
data WorkspaceCursors a = WorkspaceCursors (Cursors String)
deriving (Typeable,Read,Show)
-- | The state is stored in the 'WorkspaceCursors' layout modifier. Put this as
-- your outermost modifier, unless you want different cursors at different
-- times (using "XMonad.Layout.MultiToggle")
workspaceCursors :: Cursors String -> l a -> ModifiedLayout WorkspaceCursors l a
workspaceCursors = ModifiedLayout . WorkspaceCursors
data ChangeCursors = ChangeCursors { unWrap :: Cursors String -> X (Cursors String) }
deriving (Typeable)
instance Message ChangeCursors
updateXMD :: Cursors WorkspaceId -> X ()
updateXMD cs = do
changed <- gets $ (getFocus cs /=) . W.currentTag . windowset
when changed $ windows $ W.greedyView $ getFocus cs
instance LayoutModifier WorkspaceCursors a where
redoLayout (WorkspaceCursors cs) _ _ arrs = do
cws <- gets $ W.currentTag . windowset
return (arrs,WorkspaceCursors <$> focusTo cws cs)
handleMess (WorkspaceCursors cs) m =
sequenceA $ fmap WorkspaceCursors . ($ cs) . unWrap <$> fromMessage m
|
