    -----------------------------------------------------------------------------
    -- |
    -- Module      :  XMonad.Actions.CycleWS
    -- Copyright   :  (c) Joachim Breitner <mail@joachim-breitner.de>,
    --                    Nelson Elhage <nelhage@mit.edu> (`toggleWS' function)
    -- License     :  BSD3-style (see LICENSE)
    --
    -- Maintainer  :  Joachim Breitner <mail@joachim-breitner.de>
    -- Stability   :  unstable
    -- Portability :  unportable
    --
    -- Provides bindings to cycle forward or backward through the list of
    -- workspaces, to move windows between workspaces, and to cycle
    -- between screens.  More general combinators provide ways to cycle
    -- through workspaces in various orders, to only cycle through some
    -- subset of workspaces, and to cycle by more than one workspace at a
    -- time.
    --
    -- Note that this module now subsumes the functionality of the former
    -- @XMonad.Actions.RotView@.  Former users of @rotView@ can simply replace
    -- @rotView True@ with @moveTo Next NonEmptyWS@, and so on.
    --
    -- If you want to exactly replicate the action of @rotView@ (cycling
    -- through workspace in order lexicographically by tag, instead of in
    -- the order specified in the config), it can be implemented as:
    --
    -- > rotView b  = do t <- findWorkspace getSortByTag (bToDir b) NonEmptyWS 1
    -- >                 windows . greedyView $ t
    -- >   where bToDir True  = Next
    -- >         bToDir False = Prev
    --
    -----------------------------------------------------------------------------

    module XMonad.Actions.CycleWS (
                                    -- * Usage
                                    -- $usage

                                    -- * Moving between workspaces
                                    -- $moving

                                    nextWS
                                  , prevWS
                                  , shiftToNext
                                  , shiftToPrev

                                    -- * Toggling the previous workspace
                                    -- $toggling
                                  , toggleWS
                                  , toggleWS'
                                  , toggleOrView

                                    -- * Moving between screens (xinerama)

                                  , nextScreen
                                  , prevScreen
                                  , shiftNextScreen
                                  , shiftPrevScreen
                                  , swapNextScreen
                                  , swapPrevScreen

                                    -- * Moving between workspaces, take two!
                                    -- $taketwo

                                  , Direction1D(..)
                                  , WSType(..)

                                  , shiftTo
                                  , moveTo
                                  , doTo

                                    -- * The mother-combinator

                                  , findWorkspace
                                  , toggleOrDoSkip
                                  , skipTags

                                  , screenBy

                                 ) where

    import Data.List ( find, findIndex )
    import Data.Maybe ( isNothing, isJust )

    import XMonad hiding (workspaces)
    import qualified XMonad.Hooks.WorkspaceHistory as WH
    import XMonad.StackSet hiding (filter)
    import XMonad.Util.Types
    import XMonad.Util.WorkspaceCompare

    -- $usage
    -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@ file:
    --
    -- > import XMonad.Actions.CycleWS
    -- >
    -- > -- a basic CycleWS setup
    -- >
    -- >   , ((modm,               xK_Down),  nextWS)
    -- >   , ((modm,               xK_Up),    prevWS)
    -- >   , ((modm .|. shiftMask, xK_Down),  shiftToNext)
    -- >   , ((modm .|. shiftMask, xK_Up),    shiftToPrev)
    -- >   , ((modm,               xK_Right), nextScreen)
    -- >   , ((modm,               xK_Left),  prevScreen)
    -- >   , ((modm .|. shiftMask, xK_Right), shiftNextScreen)
    -- >   , ((modm .|. shiftMask, xK_Left),  shiftPrevScreen)
    -- >   , ((modm,               xK_z),     toggleWS)
    --
    -- If you want to follow the moved window, you can use both actions:
    --
    -- >   , ((modm .|. shiftMask, xK_Down), shiftToNext >> nextWS)
    -- >   , ((modm .|. shiftMask, xK_Up),   shiftToPrev >> prevWS)
    --
    -- You can also get fancier with 'moveTo', 'shiftTo', and 'findWorkspace'.
    -- For example:
    --
    -- >   , ((modm     , xK_f), moveTo Next EmptyWS)  -- find a free workspace
    -- >   , ((modm .|. controlMask, xK_Right),        -- a crazy keybinding!
    -- >         do t <- findWorkspace getSortByXineramaRule Next NonEmptyWS 2
    -- >            windows . view $ t                                         )
    --
    -- For detailed instructions on editing your key bindings, see
    -- "XMonad.Doc.Extending#Editing_key_bindings".
    --
    -- When using the toggle functions, in order to ensure that the workspace
    -- to which you switch is the previously viewed workspace, use the
    -- 'logHook' in "XMonad.Hooks.WorkspaceHistory".

    {- $moving

    The following commands for moving the view and windows between
    workspaces are somewhat inflexible, but are very simple and probably
    Do The Right Thing for most users.

    All of the commands in this section cycle through workspaces in the
    order in which they are given in your config.

    -}

    -- | Switch to the next workspace.
    nextWS :: X ()
    nextWS :: X ()
    nextWS = Int -> X ()
    switchWorkspace 1

    -- | Switch to the previous workspace.
    prevWS :: X ()
    prevWS :: X ()
    prevWS = Int -> X ()
    switchWorkspace (-1)

    -- | Move the focused window to the next workspace.
    shiftToNext :: X ()
    shiftToNext :: X ()
    shiftToNext = Int -> X ()
    shiftBy 1

    -- | Move the focused window to the previous workspace.
    shiftToPrev :: X ()
    shiftToPrev :: X ()
    shiftToPrev = Int -> X ()
    shiftBy (-1)

    -- $toggling

    -- | Toggle to the workspace displayed previously.
    toggleWS :: X ()
    toggleWS :: X ()
    toggleWS = [WorkspaceId] -> X ()
    toggleWS' []

    -- | Toggle to the previous workspace while excluding some workspaces.
    --
    -- > -- Ignore the scratchpad workspace while toggling:
    -- > ("M-b", toggleWS' ["NSP"])
    toggleWS' :: [WorkspaceId] -> X ()
    toggleWS' :: [WorkspaceId] -> X ()
    toggleWS' skips :: [WorkspaceId]
    skips = [WorkspaceId] -> X (Maybe WorkspaceId)
    lastViewedHiddenExcept [WorkspaceId]
    skips X (Maybe WorkspaceId) -> (Maybe WorkspaceId -> X ()) -> X ()
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= (Maybe WorkspaceId -> (WorkspaceId -> X ()) -> X ())
    -> (WorkspaceId -> X ()) -> Maybe WorkspaceId -> X ()
    forall a b c. (a -> b -> c) -> b -> a -> c
    flip Maybe WorkspaceId -> (WorkspaceId -> X ()) -> X ()
    forall (m :: * -> *) a. Monad m => Maybe a -> (a -> m ()) -> m ()
    whenJust ((WindowSet -> WindowSet) -> X ()
    windows ((WindowSet -> WindowSet) -> X ())
    -> (WorkspaceId -> WindowSet -> WindowSet) -> WorkspaceId -> X ()
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . WorkspaceId -> WindowSet -> WindowSet
    forall s i l a sd.
    (Eq s, Eq i) =>
    i -> StackSet i l a s sd -> StackSet i l a s sd
    view)

    -- | 'XMonad.StackSet.greedyView' a workspace, or if already there, view
    -- the previously displayed workspace ala weechat. Change @greedyView@ to
    -- @toggleOrView@ in your workspace bindings as in the 'XMonad.StackSet.view'
    -- faq at <http://haskell.org/haskellwiki/Xmonad/Frequently_asked_questions>.
    -- For more flexibility see 'toggleOrDoSkip'.
    toggleOrView :: WorkspaceId -> X ()
    toggleOrView :: WorkspaceId -> X ()
    toggleOrView = [WorkspaceId]
    -> (WorkspaceId -> WindowSet -> WindowSet) -> WorkspaceId -> X ()
    toggleOrDoSkip [] WorkspaceId -> WindowSet -> WindowSet
    forall s i l a sd.
    (Eq s, Eq i) =>
    i -> StackSet i l a s sd -> StackSet i l a s sd
    greedyView

    -- | Allows ignoring listed workspace tags (such as scratchpad's \"NSP\"), and
    -- running other actions such as view, shift, etc.  For example:
    --
    -- > import qualified XMonad.StackSet as W
    -- > import XMonad.Actions.CycleWS
    -- >
    -- > -- toggleOrView for people who prefer view to greedyView
    -- > toggleOrView' = toggleOrDoSkip [] W.view
    -- >
    -- > -- toggleOrView ignoring scratchpad and named scratchpad workspace
    -- > toggleOrViewNoSP = toggleOrDoSkip ["NSP"] W.greedyView
    toggleOrDoSkip :: [WorkspaceId] -> (WorkspaceId -> WindowSet -> WindowSet)
                                      -> WorkspaceId -> X ()
    toggleOrDoSkip :: [WorkspaceId]
    -> (WorkspaceId -> WindowSet -> WindowSet) -> WorkspaceId -> X ()
    toggleOrDoSkip skips :: [WorkspaceId]
    skips f :: WorkspaceId -> WindowSet -> WindowSet
    f toWS :: WorkspaceId
    toWS = do
        WorkspaceId
    cur <- (XState -> WorkspaceId) -> X WorkspaceId
    forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
    gets (WindowSet -> WorkspaceId
    forall i l a s sd. StackSet i l a s sd -> i
    currentTag (WindowSet -> WorkspaceId)
    -> (XState -> WindowSet) -> XState -> WorkspaceId
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . XState -> WindowSet
    windowset)
        if WorkspaceId
    toWS WorkspaceId -> WorkspaceId -> Bool
    forall a. Eq a => a -> a -> Bool
    == WorkspaceId
    cur
            then [WorkspaceId] -> X (Maybe WorkspaceId)
    lastViewedHiddenExcept [WorkspaceId]
    skips X (Maybe WorkspaceId) -> (Maybe WorkspaceId -> X ()) -> X ()
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= (Maybe WorkspaceId -> (WorkspaceId -> X ()) -> X ())
    -> (WorkspaceId -> X ()) -> Maybe WorkspaceId -> X ()
    forall a b c. (a -> b -> c) -> b -> a -> c
    flip Maybe WorkspaceId -> (WorkspaceId -> X ()) -> X ()
    forall (m :: * -> *) a. Monad m => Maybe a -> (a -> m ()) -> m ()
    whenJust ((WindowSet -> WindowSet) -> X ()
    windows ((WindowSet -> WindowSet) -> X ())
    -> (WorkspaceId -> WindowSet -> WindowSet) -> WorkspaceId -> X ()
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . WorkspaceId -> WindowSet -> WindowSet
    f)
            else (WindowSet -> WindowSet) -> X ()
    windows (WorkspaceId -> WindowSet -> WindowSet
    f WorkspaceId
    toWS)

    -- | List difference ('\\') for workspaces and tags. Removes workspaces
    -- matching listed tags from the given workspace list.
    skipTags :: (Eq i) => [Workspace i l a] -> [i] -> [Workspace i l a]
    skipTags :: [Workspace i l a] -> [i] -> [Workspace i l a]
    skipTags wss :: [Workspace i l a]
    wss ids :: [i]
    ids = (Workspace i l a -> Bool) -> [Workspace i l a] -> [Workspace i l a]
    forall a. (a -> Bool) -> [a] -> [a]
    filter ((i -> [i] -> Bool
    forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
    `notElem` [i]
    ids) (i -> Bool) -> (Workspace i l a -> i) -> Workspace i l a -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Workspace i l a -> i
    forall i l a. Workspace i l a -> i
    tag) [Workspace i l a]
    wss

    -- | Ignoring the skips, find the best candidate for the last viewed hidden
    -- workspace.
    lastViewedHiddenExcept :: [WorkspaceId] -> X (Maybe WorkspaceId)
    lastViewedHiddenExcept :: [WorkspaceId] -> X (Maybe WorkspaceId)
    lastViewedHiddenExcept skips :: [WorkspaceId]
    skips = do
        [WorkspaceId]
    hs <- (XState -> [WorkspaceId]) -> X [WorkspaceId]
    forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
    gets ((XState -> [WorkspaceId]) -> X [WorkspaceId])
    -> (XState -> [WorkspaceId]) -> X [WorkspaceId]
    forall a b. (a -> b) -> a -> b
    $ (Workspace WorkspaceId (Layout Window) Window -> WorkspaceId)
    -> [Workspace WorkspaceId (Layout Window) Window] -> [WorkspaceId]
    forall a b. (a -> b) -> [a] -> [b]
    map Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall i l a. Workspace i l a -> i
    tag ([Workspace WorkspaceId (Layout Window) Window] -> [WorkspaceId])
    -> (XState -> [Workspace WorkspaceId (Layout Window) Window])
    -> XState
    -> [WorkspaceId]
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . ([Workspace WorkspaceId (Layout Window) Window]
     -> [WorkspaceId] -> [Workspace WorkspaceId (Layout Window) Window])
    -> [WorkspaceId]
    -> [Workspace WorkspaceId (Layout Window) Window]
    -> [Workspace WorkspaceId (Layout Window) Window]
    forall a b c. (a -> b -> c) -> b -> a -> c
    flip [Workspace WorkspaceId (Layout Window) Window]
    -> [WorkspaceId] -> [Workspace WorkspaceId (Layout Window) Window]
    forall i l a. Eq i => [Workspace i l a] -> [i] -> [Workspace i l a]
    skipTags [WorkspaceId]
    skips ([Workspace WorkspaceId (Layout Window) Window]
     -> [Workspace WorkspaceId (Layout Window) Window])
    -> (XState -> [Workspace WorkspaceId (Layout Window) Window])
    -> XState
    -> [Workspace WorkspaceId (Layout Window) Window]
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . WindowSet -> [Workspace WorkspaceId (Layout Window) Window]
    forall i l a sid sd. StackSet i l a sid sd -> [Workspace i l a]
    hidden (WindowSet -> [Workspace WorkspaceId (Layout Window) Window])
    -> (XState -> WindowSet)
    -> XState
    -> [Workspace WorkspaceId (Layout Window) Window]
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . XState -> WindowSet
    windowset
        [WorkspaceId]
    vs <- X [WorkspaceId]
    WH.workspaceHistory
        Maybe WorkspaceId -> X (Maybe WorkspaceId)
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Maybe WorkspaceId -> X (Maybe WorkspaceId))
    -> Maybe WorkspaceId -> X (Maybe WorkspaceId)
    forall a b. (a -> b) -> a -> b
    $ [WorkspaceId] -> Maybe WorkspaceId -> Maybe WorkspaceId
    forall a. [a] -> Maybe a -> Maybe a
    choose [WorkspaceId]
    hs ((WorkspaceId -> Bool) -> [WorkspaceId] -> Maybe WorkspaceId
    forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Maybe a
    find (WorkspaceId -> [WorkspaceId] -> Bool
    forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
    `elem` [WorkspaceId]
    hs) [WorkspaceId]
    vs)
        where choose :: [a] -> Maybe a -> Maybe a
    choose []    _           = Maybe a
    forall a. Maybe a
    Nothing
              choose (h :: a
    h:_) Nothing     = a -> Maybe a
    forall a. a -> Maybe a
    Just a
    h
              choose _     vh :: Maybe a
    vh@(Just _) = Maybe a
    vh

    switchWorkspace :: Int -> X ()
    switchWorkspace :: Int -> X ()
    switchWorkspace d :: Int
    d = Int -> X WorkspaceId
    wsBy Int
    d X WorkspaceId -> (WorkspaceId -> X ()) -> X ()
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= (WindowSet -> WindowSet) -> X ()
    windows ((WindowSet -> WindowSet) -> X ())
    -> (WorkspaceId -> WindowSet -> WindowSet) -> WorkspaceId -> X ()
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . WorkspaceId -> WindowSet -> WindowSet
    forall s i l a sd.
    (Eq s, Eq i) =>
    i -> StackSet i l a s sd -> StackSet i l a s sd
    greedyView

    shiftBy :: Int -> X ()
    shiftBy :: Int -> X ()
    shiftBy d :: Int
    d = Int -> X WorkspaceId
    wsBy Int
    d X WorkspaceId -> (WorkspaceId -> X ()) -> X ()
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= (WindowSet -> WindowSet) -> X ()
    windows ((WindowSet -> WindowSet) -> X ())
    -> (WorkspaceId -> WindowSet -> WindowSet) -> WorkspaceId -> X ()
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . WorkspaceId -> WindowSet -> WindowSet
    forall a s i l sd.
    (Ord a, Eq s, Eq i) =>
    i -> StackSet i l a s sd -> StackSet i l a s sd
    shift

    wsBy :: Int -> X (WorkspaceId)
    wsBy :: Int -> X WorkspaceId
    wsBy = X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    -> Direction1D -> WSType -> Int -> X WorkspaceId
    findWorkspace X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    getSortByIndex Direction1D
    Next WSType
    AnyWS

    {- $taketwo

    A few more general commands are also provided, which allow cycling
    through subsets of workspaces.

    For example,

    >   moveTo Next EmptyWS

    will move to the first available workspace with no windows, and

    >   shiftTo Prev (WSIs $ return (('p' `elem`) . tag))

    will move the focused window backwards to the first workspace containing
    the letter 'p' in its name. =)

    -}

    -- | What type of workspaces should be included in the cycle?
    data WSType = EmptyWS     -- ^ cycle through empty workspaces
                | NonEmptyWS  -- ^ cycle through non-empty workspaces
                | HiddenWS    -- ^ cycle through non-visible workspaces
                | HiddenNonEmptyWS  -- ^ cycle through non-empty non-visible workspaces
                | HiddenEmptyWS  -- ^ cycle through empty non-visible workspaces
                | AnyWS       -- ^ cycle through all workspaces
                | WSTagGroup Char
                              -- ^ cycle through workspaces in the same group, the
                              --   group name is all characters up to the first
                              --   separator character or the end of the tag
                | WSIs (X (WindowSpace -> Bool))
                              -- ^ cycle through workspaces satisfying
                              --   an arbitrary predicate

    -- | Convert a WSType value to a predicate on workspaces.
    wsTypeToPred :: WSType -> X (WindowSpace -> Bool)
    wsTypeToPred :: WSType -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    wsTypeToPred EmptyWS    = (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Maybe (Stack Window) -> Bool
    forall a. Maybe a -> Bool
    isNothing (Maybe (Stack Window) -> Bool)
    -> (Workspace WorkspaceId (Layout Window) Window
        -> Maybe (Stack Window))
    -> Workspace WorkspaceId (Layout Window) Window
    -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Workspace WorkspaceId (Layout Window) Window
    -> Maybe (Stack Window)
    forall i l a. Workspace i l a -> Maybe (Stack a)
    stack)
    wsTypeToPred NonEmptyWS = (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Maybe (Stack Window) -> Bool
    forall a. Maybe a -> Bool
    isJust (Maybe (Stack Window) -> Bool)
    -> (Workspace WorkspaceId (Layout Window) Window
        -> Maybe (Stack Window))
    -> Workspace WorkspaceId (Layout Window) Window
    -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Workspace WorkspaceId (Layout Window) Window
    -> Maybe (Stack Window)
    forall i l a. Workspace i l a -> Maybe (Stack a)
    stack)
    wsTypeToPred HiddenWS   = do [WorkspaceId]
    hs <- (XState -> [WorkspaceId]) -> X [WorkspaceId]
    forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
    gets ((Workspace WorkspaceId (Layout Window) Window -> WorkspaceId)
    -> [Workspace WorkspaceId (Layout Window) Window] -> [WorkspaceId]
    forall a b. (a -> b) -> [a] -> [b]
    map Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall i l a. Workspace i l a -> i
    tag ([Workspace WorkspaceId (Layout Window) Window] -> [WorkspaceId])
    -> (XState -> [Workspace WorkspaceId (Layout Window) Window])
    -> XState
    -> [WorkspaceId]
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . WindowSet -> [Workspace WorkspaceId (Layout Window) Window]
    forall i l a sid sd. StackSet i l a sid sd -> [Workspace i l a]
    hidden (WindowSet -> [Workspace WorkspaceId (Layout Window) Window])
    -> (XState -> WindowSet)
    -> XState
    -> [Workspace WorkspaceId (Layout Window) Window]
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . XState -> WindowSet
    windowset)
                                 (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    forall (m :: * -> *) a. Monad m => a -> m a
    return (\w :: Workspace WorkspaceId (Layout Window) Window
    w -> Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall i l a. Workspace i l a -> i
    tag Workspace WorkspaceId (Layout Window) Window
    w WorkspaceId -> [WorkspaceId] -> Bool
    forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
    `elem` [WorkspaceId]
    hs)
    wsTypeToPred HiddenNonEmptyWS  = do Workspace WorkspaceId (Layout Window) Window -> Bool
    ne <- WSType -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    wsTypeToPred WSType
    NonEmptyWS
                                        Workspace WorkspaceId (Layout Window) Window -> Bool
    hi <- WSType -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    wsTypeToPred WSType
    HiddenWS
                                        (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    forall (m :: * -> *) a. Monad m => a -> m a
    return (\w :: Workspace WorkspaceId (Layout Window) Window
    w -> Workspace WorkspaceId (Layout Window) Window -> Bool
    hi Workspace WorkspaceId (Layout Window) Window
    w Bool -> Bool -> Bool
    && Workspace WorkspaceId (Layout Window) Window -> Bool
    ne Workspace WorkspaceId (Layout Window) Window
    w)
    wsTypeToPred HiddenEmptyWS  = do Workspace WorkspaceId (Layout Window) Window -> Bool
    ne <- WSType -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    wsTypeToPred WSType
    EmptyWS
                                     Workspace WorkspaceId (Layout Window) Window -> Bool
    hi <- WSType -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    wsTypeToPred WSType
    HiddenWS
                                     (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    forall (m :: * -> *) a. Monad m => a -> m a
    return (\w :: Workspace WorkspaceId (Layout Window) Window
    w -> Workspace WorkspaceId (Layout Window) Window -> Bool
    hi Workspace WorkspaceId (Layout Window) Window
    w Bool -> Bool -> Bool
    && Workspace WorkspaceId (Layout Window) Window -> Bool
    ne Workspace WorkspaceId (Layout Window) Window
    w)
    wsTypeToPred AnyWS      = (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Bool -> Workspace WorkspaceId (Layout Window) Window -> Bool
    forall a b. a -> b -> a
    const Bool
    True)
    wsTypeToPred (WSTagGroup sep :: Char
    sep) = do WorkspaceId
    cur <- (Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall l a. Workspace WorkspaceId l a -> WorkspaceId
    groupName(Workspace WorkspaceId (Layout Window) Window -> WorkspaceId)
    -> (WindowSet -> Workspace WorkspaceId (Layout Window) Window)
    -> WindowSet
    -> WorkspaceId
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    .Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail
    -> Workspace WorkspaceId (Layout Window) Window
    forall i l a sid sd. Screen i l a sid sd -> Workspace i l a
    workspace(Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail
     -> Workspace WorkspaceId (Layout Window) Window)
    -> (WindowSet
        -> Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail)
    -> WindowSet
    -> Workspace WorkspaceId (Layout Window) Window
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    .WindowSet
    -> Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail
    forall i l a sid sd. StackSet i l a sid sd -> Screen i l a sid sd
    current) (WindowSet -> WorkspaceId) -> X WindowSet -> X WorkspaceId
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    `fmap` (XState -> WindowSet) -> X WindowSet
    forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
    gets XState -> WindowSet
    windowset
                                       (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    forall (m :: * -> *) a. Monad m => a -> m a
    return ((Workspace WorkspaceId (Layout Window) Window -> Bool)
     -> X (Workspace WorkspaceId (Layout Window) Window -> Bool))
    -> (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    forall a b. (a -> b) -> a -> b
    $ (WorkspaceId
    cur WorkspaceId -> WorkspaceId -> Bool
    forall a. Eq a => a -> a -> Bool
    ==)(WorkspaceId -> Bool)
    -> (Workspace WorkspaceId (Layout Window) Window -> WorkspaceId)
    -> Workspace WorkspaceId (Layout Window) Window
    -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    .Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall l a. Workspace WorkspaceId l a -> WorkspaceId
    groupName
                                       where groupName :: Workspace WorkspaceId l a -> WorkspaceId
    groupName = (Char -> Bool) -> WorkspaceId -> WorkspaceId
    forall a. (a -> Bool) -> [a] -> [a]
    takeWhile (Char -> Char -> Bool
    forall a. Eq a => a -> a -> Bool
    /=Char
    sep)(WorkspaceId -> WorkspaceId)
    -> (Workspace WorkspaceId l a -> WorkspaceId)
    -> Workspace WorkspaceId l a
    -> WorkspaceId
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    .Workspace WorkspaceId l a -> WorkspaceId
    forall i l a. Workspace i l a -> i
    tag
    wsTypeToPred (WSIs p :: X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    p)   = X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    p

    -- | View the next workspace in the given direction that satisfies
    --   the given condition.
    moveTo :: Direction1D -> WSType -> X ()
    moveTo :: Direction1D -> WSType -> X ()
    moveTo dir :: Direction1D
    dir t :: WSType
    t = Direction1D
    -> WSType
    -> X ([Workspace WorkspaceId (Layout Window) Window]
          -> [Workspace WorkspaceId (Layout Window) Window])
    -> (WorkspaceId -> X ())
    -> X ()
    doTo Direction1D
    dir WSType
    t X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    getSortByIndex ((WindowSet -> WindowSet) -> X ()
    windows ((WindowSet -> WindowSet) -> X ())
    -> (WorkspaceId -> WindowSet -> WindowSet) -> WorkspaceId -> X ()
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . WorkspaceId -> WindowSet -> WindowSet
    forall s i l a sd.
    (Eq s, Eq i) =>
    i -> StackSet i l a s sd -> StackSet i l a s sd
    greedyView)

    -- | Move the currently focused window to the next workspace in the
    --   given direction that satisfies the given condition.
    shiftTo :: Direction1D -> WSType -> X ()
    shiftTo :: Direction1D -> WSType -> X ()
    shiftTo dir :: Direction1D
    dir t :: WSType
    t = Direction1D
    -> WSType
    -> X ([Workspace WorkspaceId (Layout Window) Window]
          -> [Workspace WorkspaceId (Layout Window) Window])
    -> (WorkspaceId -> X ())
    -> X ()
    doTo Direction1D
    dir WSType
    t X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    getSortByIndex ((WindowSet -> WindowSet) -> X ()
    windows ((WindowSet -> WindowSet) -> X ())
    -> (WorkspaceId -> WindowSet -> WindowSet) -> WorkspaceId -> X ()
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . WorkspaceId -> WindowSet -> WindowSet
    forall a s i l sd.
    (Ord a, Eq s, Eq i) =>
    i -> StackSet i l a s sd -> StackSet i l a s sd
    shift)

    -- | Using the given sort, find the next workspace in the given
    -- direction of the given type, and perform the given action on it.
    doTo :: Direction1D -> WSType -> X WorkspaceSort -> (WorkspaceId -> X ()) -> X ()
    doTo :: Direction1D
    -> WSType
    -> X ([Workspace WorkspaceId (Layout Window) Window]
          -> [Workspace WorkspaceId (Layout Window) Window])
    -> (WorkspaceId -> X ())
    -> X ()
    doTo dir :: Direction1D
    dir t :: WSType
    t srt :: X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    srt act :: WorkspaceId -> X ()
    act = X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    -> Direction1D -> WSType -> Int -> X WorkspaceId
    findWorkspace X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    srt Direction1D
    dir WSType
    t 1 X WorkspaceId -> (WorkspaceId -> X ()) -> X ()
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= WorkspaceId -> X ()
    act

    -- | Given a function @s@ to sort workspaces, a direction @dir@, a
    --   predicate @p@ on workspaces, and an integer @n@, find the tag of
    --   the workspace which is @n@ away from the current workspace in
    --   direction @dir@ (wrapping around if necessary), among those
    --   workspaces, sorted by @s@, which satisfy @p@.
    --
    --   For some useful workspace sorting functions, see
    --   "XMonad.Util.WorkspaceCompare".
    --
    --   For ideas of what to do with a workspace tag once obtained, note
    --   that 'moveTo' and 'shiftTo' are implemented by applying @(>>=
    --   (windows . greedyView))@ and @(>>= (windows . shift))@, respectively,
    --   to the output of 'findWorkspace'.
    findWorkspace :: X WorkspaceSort -> Direction1D -> WSType -> Int -> X WorkspaceId
    findWorkspace :: X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    -> Direction1D -> WSType -> Int -> X WorkspaceId
    findWorkspace s :: X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    s dir :: Direction1D
    dir t :: WSType
    t n :: Int
    n = X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> Int
    -> X WorkspaceId
    findWorkspaceGen X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    s (WSType -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    wsTypeToPred WSType
    t) (Direction1D -> Int -> Int
    forall p. Num p => Direction1D -> p -> p
    maybeNegate Direction1D
    dir Int
    n)
      where
        maybeNegate :: Direction1D -> p -> p
    maybeNegate Next d :: p
    d = p
    d
        maybeNegate Prev d :: p
    d = (-p
    d)

    findWorkspaceGen :: X WorkspaceSort -> X (WindowSpace -> Bool) -> Int -> X WorkspaceId
    findWorkspaceGen :: X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    -> X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> Int
    -> X WorkspaceId
    findWorkspaceGen _ _ 0 = (XState -> WorkspaceId) -> X WorkspaceId
    forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
    gets (WindowSet -> WorkspaceId
    forall i l a s sd. StackSet i l a s sd -> i
    currentTag (WindowSet -> WorkspaceId)
    -> (XState -> WindowSet) -> XState -> WorkspaceId
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . XState -> WindowSet
    windowset)
    findWorkspaceGen sortX :: X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    sortX wsPredX :: X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    wsPredX d :: Int
    d = do
        Workspace WorkspaceId (Layout Window) Window -> Bool
    wsPred <- X (Workspace WorkspaceId (Layout Window) Window -> Bool)
    wsPredX
        [Workspace WorkspaceId (Layout Window) Window]
    -> [Workspace WorkspaceId (Layout Window) Window]
    sort   <- X ([Workspace WorkspaceId (Layout Window) Window]
       -> [Workspace WorkspaceId (Layout Window) Window])
    sortX
        WindowSet
    ws     <- (XState -> WindowSet) -> X WindowSet
    forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
    gets XState -> WindowSet
    windowset
        let cur :: Workspace WorkspaceId (Layout Window) Window
    cur     = Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail
    -> Workspace WorkspaceId (Layout Window) Window
    forall i l a sid sd. Screen i l a sid sd -> Workspace i l a
    workspace (WindowSet
    -> Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail
    forall i l a sid sd. StackSet i l a sid sd -> Screen i l a sid sd
    current WindowSet
    ws)
            sorted :: [Workspace WorkspaceId (Layout Window) Window]
    sorted  = [Workspace WorkspaceId (Layout Window) Window]
    -> [Workspace WorkspaceId (Layout Window) Window]
    sort (WindowSet -> [Workspace WorkspaceId (Layout Window) Window]
    forall i l a sid sd. StackSet i l a sid sd -> [Workspace i l a]
    workspaces WindowSet
    ws)
            pivoted :: [Workspace WorkspaceId (Layout Window) Window]
    pivoted = let (a :: [Workspace WorkspaceId (Layout Window) Window]
    a,b :: [Workspace WorkspaceId (Layout Window) Window]
    b) = (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> [Workspace WorkspaceId (Layout Window) Window]
    -> ([Workspace WorkspaceId (Layout Window) Window],
        [Workspace WorkspaceId (Layout Window) Window])
    forall a. (a -> Bool) -> [a] -> ([a], [a])
    span ((WorkspaceId -> WorkspaceId -> Bool
    forall a. Eq a => a -> a -> Bool
    /= (Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall i l a. Workspace i l a -> i
    tag Workspace WorkspaceId (Layout Window) Window
    cur)) (WorkspaceId -> Bool)
    -> (Workspace WorkspaceId (Layout Window) Window -> WorkspaceId)
    -> Workspace WorkspaceId (Layout Window) Window
    -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall i l a. Workspace i l a -> i
    tag) [Workspace WorkspaceId (Layout Window) Window]
    sorted in [Workspace WorkspaceId (Layout Window) Window]
    b [Workspace WorkspaceId (Layout Window) Window]
    -> [Workspace WorkspaceId (Layout Window) Window]
    -> [Workspace WorkspaceId (Layout Window) Window]
    forall a. [a] -> [a] -> [a]
    ++ [Workspace WorkspaceId (Layout Window) Window]
    a
            ws' :: [Workspace WorkspaceId (Layout Window) Window]
    ws'     = (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> [Workspace WorkspaceId (Layout Window) Window]
    -> [Workspace WorkspaceId (Layout Window) Window]
    forall a. (a -> Bool) -> [a] -> [a]
    filter Workspace WorkspaceId (Layout Window) Window -> Bool
    wsPred [Workspace WorkspaceId (Layout Window) Window]
    pivoted
            mCurIx :: Maybe Int
    mCurIx  = Workspace WorkspaceId (Layout Window) Window
    -> [Workspace WorkspaceId (Layout Window) Window] -> Maybe Int
    findWsIndex Workspace WorkspaceId (Layout Window) Window
    cur [Workspace WorkspaceId (Layout Window) Window]
    ws'
            d' :: Int
    d'      = if Int
    d Int -> Int -> Bool
    forall a. Ord a => a -> a -> Bool
    > 0 then Int
    d Int -> Int -> Int
    forall a. Num a => a -> a -> a
    - 1 else Int
    d
            next :: Workspace WorkspaceId (Layout Window) Window
    next    = if [Workspace WorkspaceId (Layout Window) Window] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [Workspace WorkspaceId (Layout Window) Window]
    ws'
                          then Workspace WorkspaceId (Layout Window) Window
    cur
                          else case Maybe Int
    mCurIx of
                                Nothing -> [Workspace WorkspaceId (Layout Window) Window]
    ws' [Workspace WorkspaceId (Layout Window) Window]
    -> Int -> Workspace WorkspaceId (Layout Window) Window
    forall a. [a] -> Int -> a
    !! (Int
    d' Int -> Int -> Int
    forall a. Integral a => a -> a -> a
    `mod` [Workspace WorkspaceId (Layout Window) Window] -> Int
    forall (t :: * -> *) a. Foldable t => t a -> Int
    length [Workspace WorkspaceId (Layout Window) Window]
    ws')
                                Just ix :: Int
    ix -> [Workspace WorkspaceId (Layout Window) Window]
    ws' [Workspace WorkspaceId (Layout Window) Window]
    -> Int -> Workspace WorkspaceId (Layout Window) Window
    forall a. [a] -> Int -> a
    !! ((Int
    ix Int -> Int -> Int
    forall a. Num a => a -> a -> a
    + Int
    d) Int -> Int -> Int
    forall a. Integral a => a -> a -> a
    `mod` [Workspace WorkspaceId (Layout Window) Window] -> Int
    forall (t :: * -> *) a. Foldable t => t a -> Int
    length [Workspace WorkspaceId (Layout Window) Window]
    ws')
        WorkspaceId -> X WorkspaceId
    forall (m :: * -> *) a. Monad m => a -> m a
    return (WorkspaceId -> X WorkspaceId) -> WorkspaceId -> X WorkspaceId
    forall a b. (a -> b) -> a -> b
    $ Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall i l a. Workspace i l a -> i
    tag Workspace WorkspaceId (Layout Window) Window
    next

    findWsIndex :: WindowSpace -> [WindowSpace] -> Maybe Int
    findWsIndex :: Workspace WorkspaceId (Layout Window) Window
    -> [Workspace WorkspaceId (Layout Window) Window] -> Maybe Int
    findWsIndex ws :: Workspace WorkspaceId (Layout Window) Window
    ws wss :: [Workspace WorkspaceId (Layout Window) Window]
    wss = (Workspace WorkspaceId (Layout Window) Window -> Bool)
    -> [Workspace WorkspaceId (Layout Window) Window] -> Maybe Int
    forall a. (a -> Bool) -> [a] -> Maybe Int
    findIndex ((WorkspaceId -> WorkspaceId -> Bool
    forall a. Eq a => a -> a -> Bool
    == Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall i l a. Workspace i l a -> i
    tag Workspace WorkspaceId (Layout Window) Window
    ws) (WorkspaceId -> Bool)
    -> (Workspace WorkspaceId (Layout Window) Window -> WorkspaceId)
    -> Workspace WorkspaceId (Layout Window) Window
    -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Workspace WorkspaceId (Layout Window) Window -> WorkspaceId
    forall i l a. Workspace i l a -> i
    tag) [Workspace WorkspaceId (Layout Window) Window]
    wss

    -- | View next screen
    nextScreen :: X ()
    nextScreen :: X ()
    nextScreen = Int -> X ()
    switchScreen 1

    -- | View prev screen
    prevScreen :: X ()
    prevScreen :: X ()
    prevScreen = Int -> X ()
    switchScreen (-1)

    switchScreen :: Int -> X ()
    switchScreen :: Int -> X ()
    switchScreen d :: Int
    d = do ScreenId
    s <- Int -> X ScreenId
    screenBy Int
    d
                        Maybe WorkspaceId
    mws <- ScreenId -> X (Maybe WorkspaceId)
    screenWorkspace ScreenId
    s
                        case Maybe WorkspaceId
    mws of
                             Nothing -> () -> X ()
    forall (m :: * -> *) a. Monad m => a -> m a
    return ()
                             Just ws :: WorkspaceId
    ws -> (WindowSet -> WindowSet) -> X ()
    windows (WorkspaceId -> WindowSet -> WindowSet
    forall s i l a sd.
    (Eq s, Eq i) =>
    i -> StackSet i l a s sd -> StackSet i l a s sd
    view WorkspaceId
    ws)

    {- | Get the 'ScreenId' /d/ places over. Example usage is a variation of the
    the default screen keybindings:

    >     -- mod-{w,e}, Switch to previous/next Xinerama screen
    >     -- mod-shift-{w,e}, Move client to previous/next Xinerama screen
    >     --
    >     [((m .|. modm, key), sc >>= screenWorkspace >>= flip whenJust (windows . f))
    >         | (key, sc) <- zip [xK_w, xK_e] [(screenBy (-1)),(screenBy 1)]
    >         , (f, m) <- [(W.view, 0), (W.shift, shiftMask)]]

    -}
    screenBy :: Int -> X (ScreenId)
    screenBy :: Int -> X ScreenId
    screenBy d :: Int
    d = do WindowSet
    ws <- (XState -> WindowSet) -> X WindowSet
    forall s (m :: * -> *) a. MonadState s m => (s -> a) -> m a
    gets XState -> WindowSet
    windowset
                    --let ss = sortBy screen (screens ws)
                    let now :: ScreenId
    now = Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail
    -> ScreenId
    forall i l a sid sd. Screen i l a sid sd -> sid
    screen (WindowSet
    -> Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail
    forall i l a sid sd. StackSet i l a sid sd -> Screen i l a sid sd
    current WindowSet
    ws)
                    ScreenId -> X ScreenId
    forall (m :: * -> *) a. Monad m => a -> m a
    return (ScreenId -> X ScreenId) -> ScreenId -> X ScreenId
    forall a b. (a -> b) -> a -> b
    $ (ScreenId
    now ScreenId -> ScreenId -> ScreenId
    forall a. Num a => a -> a -> a
    + Int -> ScreenId
    forall a b. (Integral a, Num b) => a -> b
    fromIntegral Int
    d) ScreenId -> ScreenId -> ScreenId
    forall a. Integral a => a -> a -> a
    `mod` Int -> ScreenId
    forall a b. (Integral a, Num b) => a -> b
    fromIntegral ([Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail]
    -> Int
    forall (t :: * -> *) a. Foldable t => t a -> Int
    length (WindowSet
    -> [Screen
          WorkspaceId (Layout Window) Window ScreenId ScreenDetail]
    forall i l a s sd. StackSet i l a s sd -> [Screen i l a s sd]
    screens WindowSet
    ws))

    -- | Swap current screen with next screen
    swapNextScreen :: X ()
    swapNextScreen :: X ()
    swapNextScreen = Int -> X ()
    swapScreen 1

    -- | Swap current screen with previous screen
    swapPrevScreen :: X ()
    swapPrevScreen :: X ()
    swapPrevScreen = Int -> X ()
    swapScreen (-1)

    swapScreen :: Int -> X ()
    swapScreen :: Int -> X ()
    swapScreen d :: Int
    d = do ScreenId
    s <- Int -> X ScreenId
    screenBy Int
    d
                      Maybe WorkspaceId
    mws <- ScreenId -> X (Maybe WorkspaceId)
    screenWorkspace ScreenId
    s
                      case Maybe WorkspaceId
    mws of
                        Nothing -> () -> X ()
    forall (m :: * -> *) a. Monad m => a -> m a
    return ()
                        Just ws :: WorkspaceId
    ws -> (WindowSet -> WindowSet) -> X ()
    windows (WorkspaceId -> WindowSet -> WindowSet
    forall s i l a sd.
    (Eq s, Eq i) =>
    i -> StackSet i l a s sd -> StackSet i l a s sd
    greedyView WorkspaceId
    ws)

    -- | Move focused window to workspace on next screen
    shiftNextScreen :: X ()
    shiftNextScreen :: X ()
    shiftNextScreen = Int -> X ()
    shiftScreenBy 1

    -- | Move focused window to workspace on prev screen
    shiftPrevScreen :: X ()
    shiftPrevScreen :: X ()
    shiftPrevScreen = Int -> X ()
    shiftScreenBy (-1)

    shiftScreenBy :: Int -> X ()
    shiftScreenBy :: Int -> X ()
    shiftScreenBy d :: Int
    d = do ScreenId
    s <- Int -> X ScreenId
    screenBy Int
    d
                         Maybe WorkspaceId
    mws <- ScreenId -> X (Maybe WorkspaceId)
    screenWorkspace ScreenId
    s
                         case Maybe WorkspaceId
    mws of
                             Nothing -> () -> X ()
    forall (m :: * -> *) a. Monad m => a -> m a
    return ()
                             Just ws :: WorkspaceId
    ws -> (WindowSet -> WindowSet) -> X ()
    windows (WorkspaceId -> WindowSet -> WindowSet
    forall a s i l sd.
    (Ord a, Eq s, Eq i) =>
    i -> StackSet i l a s sd -> StackSet i l a s sd
    shift WorkspaceId
    ws)