New module: XMonad.Prelude

This is a convenience module in order to have less import noise.  It
re-exports the following:

  a) Commonly used modules in full (Data.Foldable, Data.Applicative, and
     so on); though only those that play nicely with each other, so that
     XMonad.Prelude can be imported unqualified without any problems.
     This prevents things like `Prelude.(.)` and `Control.Category.(.)`
     fighting with each other.

  b) Helper functions that don't necessarily fit in any other module;
     e.g., the often used abbreviation `fi = fromIntegral`.

XMonad/Actions/Commands.hs

@@ -32,7 +32,7 @@ import XMonad.Util.Dmenu (dmenu)
 
 import qualified Data.Map as M
 import System.Exit
-import Data.Maybe
+import XMonad.Prelude
 
 -- $usage
 --

XMonad/Actions/CycleSelectedLayouts.hs

@@ -18,8 +18,7 @@ module XMonad.Actions.CycleSelectedLayouts (
     cycleThroughLayouts) where
 
 import XMonad
-import Data.List (findIndex)
+import XMonad.Prelude (findIndex, fromMaybe)
-import Data.Maybe (fromMaybe)
 import XMonad.Layout.LayoutCombinators (JumpToLayout(..))
 import qualified XMonad.StackSet as S
 

XMonad/Actions/CycleWS.hs

@@ -78,9 +78,7 @@ module XMonad.Actions.CycleWS (
 
                              ) where
 
-import Data.List ( find, findIndex )
+import XMonad.Prelude (find, findIndex, isJust, isNothing)
-import Data.Maybe ( isNothing, isJust )
-
 import XMonad hiding (workspaces)
 import qualified XMonad.Hooks.WorkspaceHistory as WH
 import XMonad.StackSet hiding (filter)

XMonad/Actions/CycleWorkspaceByScreen.hs

@@ -23,14 +23,12 @@ module XMonad.Actions.CycleWorkspaceByScreen (
   , repeatableAction
   ) where
 
-import           Control.Monad
 import           Data.IORef
-import           Data.List
-import           Data.Maybe
 
 import           Graphics.X11.Xlib.Extras
 
 import           XMonad
+import           XMonad.Prelude
 import           XMonad.Hooks.WorkspaceHistory
 import qualified XMonad.StackSet as W
 

XMonad/Actions/DynamicProjects.hs

@@ -43,14 +43,10 @@ module XMonad.Actions.DynamicProjects
        ) where
 
 --------------------------------------------------------------------------------
-import Control.Applicative ((<|>))
-import Control.Monad (when, unless)
-import Data.Char (isSpace)
-import Data.List (sort, union, stripPrefix)
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as Map
-import Data.Maybe (fromMaybe, isNothing)
 import System.Directory (setCurrentDirectory, getHomeDirectory, makeAbsolute)
+import XMonad.Prelude
 import XMonad
 import XMonad.Actions.DynamicWorkspaces
 import XMonad.Prompt

XMonad/Actions/DynamicWorkspaceGroups.hs

@@ -36,11 +36,11 @@ module XMonad.Actions.DynamicWorkspaceGroups
     , WSGPrompt
     ) where
 
-import Data.List (find)
 import Control.Arrow ((&&&))
 import qualified Data.Map as M
 
 import XMonad
+import XMonad.Prelude (find)
 import qualified XMonad.StackSet as W
 
 import XMonad.Prompt

XMonad/Actions/DynamicWorkspaceOrder.hs

@@ -44,7 +44,7 @@ import XMonad.Actions.CycleWS (findWorkspace, WSType(..), Direction1D(..), doTo)
 
 import qualified Data.Map as M
 import qualified Data.Set as S
-import Data.Maybe (fromJust, fromMaybe)
+import XMonad.Prelude (fromJust, fromMaybe)
 import Data.Ord (comparing)
 
 -- $usage

XMonad/Actions/DynamicWorkspaces.hs

@@ -35,14 +35,12 @@ module XMonad.Actions.DynamicWorkspaces (
                                          WorkspaceIndex
                                        ) where
 
+import XMonad.Prelude (find, isNothing, when)
 import XMonad hiding (workspaces)
 import XMonad.StackSet hiding (filter, modify, delete)
 import XMonad.Prompt.Workspace ( Wor(Wor), workspacePrompt )
 import XMonad.Prompt ( XPConfig, mkXPrompt )
 import XMonad.Util.WorkspaceCompare ( getSortByIndex )
-import Data.List (find)
-import Data.Maybe (isNothing)
-import Control.Monad (when)
 import qualified Data.Map.Strict as Map
 import qualified XMonad.Util.ExtensibleState as XS
 

XMonad/Actions/EasyMotion.hs

@@ -38,18 +38,13 @@ module XMonad.Actions.EasyMotion ( -- * Usage
                                  ) where
 
 import           XMonad
-import           XMonad.StackSet          as W
+import           XMonad.Prelude
+import qualified XMonad.StackSet          as W
 import           XMonad.Util.Font         (releaseXMF, initXMF, Align(AlignCenter), XMonadFont(..), textExtentsXMF)
-import           XMonad.Util.XUtils       (fi, createNewWindow, paintAndWrite, deleteWindow, showWindow)
+import           XMonad.Util.XUtils       (createNewWindow, paintAndWrite, deleteWindow, showWindow)
-import           Control.Monad            (replicateM)
+
 import           Control.Arrow            ((&&&))
-import           Data.Functor             (($>))
+import qualified Data.Map.Strict as M     (Map, elems, map, mapWithKey)
-import           Data.Maybe               (isJust, listToMaybe)
-import qualified Data.Map.Strict as M     (Map, map, mapWithKey, elems)
-import           Data.Set                 (toList)
-import           Graphics.X11.Xlib.Extras (getWindowAttributes, getEvent)
-import qualified Data.List as L           (filter, partition, find, nub)
-import           Data.List                (sortOn)
 
 -- $usage
 --
@@ -275,9 +270,9 @@ handleSelectWindow c = do
         $ M.mapWithKey (\sid ks -> buildOverlays ks <$> sortedOverlayWindows sid) m
      where
       screenById :: ScreenId -> Maybe (W.Screen WorkspaceId (Layout Window) Window ScreenId ScreenDetail)
-      screenById sid = L.find ((== sid) . screen) (W.screens ws)
+      screenById sid = find ((== sid) . W.screen) (W.screens ws)
       visibleWindowsOnScreen :: ScreenId -> [Window]
-      visibleWindowsOnScreen sid = L.filter (`elem` toList mappedWins) $ W.integrate' $ screenById sid >>= W.stack . W.workspace
+      visibleWindowsOnScreen sid = filter (`elem` toList mappedWins) $ W.integrate' $ screenById sid >>= W.stack . W.workspace
       sortedOverlayWindows :: ScreenId -> X [OverlayWindow]
       sortedOverlayWindows sid = sortOverlayWindows <$> buildOverlayWindows dpy th (visibleWindowsOnScreen sid)
   status <- io $ grabKeyboard dpy rw True grabModeAsync grabModeAsync currentTime
@@ -331,7 +326,7 @@ selectWindow conf =
  where
   -- make sure the key lists don't contain: backspace, our cancel key, or duplicates
   sanitise :: [KeySym] -> [KeySym]
-  sanitise = L.nub . L.filter (`notElem` [xK_BackSpace, cancelKey conf])
+  sanitise = nub . filter (`notElem` [xK_BackSpace, cancelKey conf])
   sanitiseKeys :: ChordKeys -> ChordKeys
   sanitiseKeys cKeys =
     case cKeys of
@@ -381,12 +376,12 @@ handleKeyboard dpy drawFn cancel selected deselected = do
     case x of
       Backspace -> redraw >> handleKeyboard dpy drawFn cancel selected deselected
       _ -> return x
-  isNextOverlayKey keySym = isJust (L.find ((== Just keySym) . listToMaybe .chord) selected)
+  isNextOverlayKey keySym = isJust (find ((== Just keySym) . listToMaybe .chord) selected)
   handleNextOverlayKey keySym =
     case fg of
       [x] -> return $ Selected x
       _   -> handleKeyboard dpy drawFn cancel (trim fg) (clear bg) >>= retryBackspace
    where
-    (fg, bg) = L.partition ((== Just keySym) . listToMaybe . chord) selected
+    (fg, bg) = partition ((== Just keySym) . listToMaybe . chord) selected
     trim = map (\o -> o { chord = tail $ chord o })
     clear = map (\o -> o { chord = [] })

XMonad/Actions/FindEmptyWorkspace.hs

@@ -18,9 +18,7 @@ module XMonad.Actions.FindEmptyWorkspace (
     viewEmptyWorkspace, tagToEmptyWorkspace, sendToEmptyWorkspace
   ) where
 
-import Data.List
+import XMonad.Prelude
-import Data.Maybe ( isNothing )
-
 import XMonad
 import XMonad.StackSet
 

XMonad/Actions/FlexibleResize.hs

@@ -20,7 +20,7 @@ module XMonad.Actions.FlexibleResize (
 ) where
 
 import XMonad
-import XMonad.Util.XUtils (fi)
+import XMonad.Prelude (fi)
 import Foreign.C.Types
 
 -- $usage

XMonad/Actions/FloatSnap.hs

@@ -27,8 +27,7 @@ module XMonad.Actions.FloatSnap (
                 ifClick') where
 
 import XMonad
-import Data.List (sort)
+import XMonad.Prelude (fromJust, isNothing, listToMaybe, sort)
-import Data.Maybe (listToMaybe,fromJust,isNothing)
 import qualified XMonad.StackSet as W
 import qualified Data.Set as S
 

XMonad/Actions/GridSelect.hs

@@ -78,15 +78,14 @@ module XMonad.Actions.GridSelect (
     -- * Types
     TwoDState,
     ) where
-import Data.Maybe
+import Control.Arrow ((***))
 import Data.Bits
-import Data.Char
 import Data.Ord (comparing)
 import Control.Monad.State
-import Control.Arrow
 import Data.List as L
 import qualified Data.Map as M
 import XMonad hiding (liftX)
+import XMonad.Prelude
 import XMonad.Util.Font
 import XMonad.Prompt (mkUnmanagedWindow)
 import XMonad.StackSet as W

XMonad/Actions/GroupNavigation.hs

@@ -35,15 +35,17 @@ module XMonad.Actions.GroupNavigation ( -- * Usage
 
 import Control.Monad.Reader
 import Control.Monad.State
-import Data.Foldable as Fold
+import Data.Map ((!))
-import Data.Map as Map
+import qualified Data.Map as Map
-import Data.Sequence as Seq
+import Data.Sequence (Seq, ViewL (EmptyL, (:<)), viewl, (<|), (><), (|>))
-import Data.Set as Set
+import qualified Data.Sequence as Seq
+import qualified Data.Set as Set
 import Graphics.X11.Types
 import Prelude hiding (concatMap, drop, elem, filter, null, reverse)
 import XMonad.Core
 import XMonad.ManageHook
 import XMonad.Operations (windows, withFocused)
+import XMonad.Prelude (elem, foldl')
 import qualified XMonad.StackSet as SS
 import qualified XMonad.Util.ExtensibleState as XS
 
@@ -132,7 +134,7 @@ orderedWindowList dir     = withWindowSet $ \ss -> do
   wsids <- asks (Seq.fromList . workspaces . config)
   let wspcs = orderedWorkspaceList ss wsids
       wins  = dirfun dir
-              $ Fold.foldl' (><) Seq.empty
+              $ foldl' (><) Seq.empty
               $ fmap (Seq.fromList . SS.integrate' . SS.stack) wspcs
       cur   = SS.peek ss
   return $ maybe wins (rotfun wins) cur
@@ -146,7 +148,7 @@ orderedWorkspaceList :: WindowSet -> Seq String -> Seq WindowSpace
 orderedWorkspaceList ss wsids = rotateTo isCurWS wspcs'
     where
       wspcs      = SS.workspaces ss
-      wspcsMap   = Fold.foldl' (\m ws -> Map.insert (SS.tag ws) ws m) Map.empty wspcs
+      wspcsMap   = foldl' (\m ws -> Map.insert (SS.tag ws) ws m) Map.empty wspcs
       wspcs'     = fmap (wspcsMap !) wsids
       isCurWS ws = SS.tag ws == SS.tag (SS.workspace $ SS.current ss)
 
@@ -172,26 +174,11 @@ updateHistory :: HistoryDB -> X HistoryDB
 updateHistory (HistoryDB oldcur oldhist) = withWindowSet $ \ss -> do
   let newcur   = SS.peek ss
       wins     = Set.fromList $ SS.allWindows ss
-      newhist  = flt (`Set.member` wins) (ins oldcur oldhist)
+      newhist  = Seq.filter (`Set.member` wins) (ins oldcur oldhist)
   return $ HistoryDB newcur (del newcur newhist)
   where
     ins x xs = maybe xs (<| xs) x
-    del x xs = maybe xs (\x' -> flt (/= x') xs) x
+    del x xs = maybe xs (\x' -> Seq.filter (/= x') xs) x
-
---- Two replacements for Seq.filter and Seq.breakl available only in
---- containers-0.3.0.0, which only ships with ghc 6.12.  Once we
---- decide to no longer support ghc < 6.12, these should be replaced
---- with Seq.filter and Seq.breakl.
-
-flt :: (a -> Bool) -> Seq a -> Seq a
-flt p = Fold.foldl (\xs x -> if p x then xs |> x else xs) Seq.empty
-
-brkl :: (a -> Bool) -> Seq a -> (Seq a, Seq a)
-brkl p xs = flip Seq.splitAt xs
-            $ snd
-            $ Fold.foldr (\x (i, j) -> if p x then (i-1, i-1) else (i-1, j)) (l, l) xs
-  where
-    l = Seq.length xs
 
 --- Some sequence helpers --------------------------------------------
 
@@ -205,7 +192,7 @@ rotate xs = rotate' (viewl xs)
 -- Rotates the sequence until an element matching the given condition
 -- is at the beginning of the sequence.
 rotateTo :: (a -> Bool) -> Seq a -> Seq a
-rotateTo cond xs = let (lxs, rxs) = brkl cond xs in rxs >< lxs
+rotateTo cond xs = let (lxs, rxs) = Seq.breakl cond xs in rxs >< lxs
 
 --- A monadic find ---------------------------------------------------
 
@@ -239,4 +226,3 @@ isOnAnyVisibleWS = do
       visibleWs = w `elem` allVisible
       unfocused = maybe True (w /=) $ SS.peek ws
   return $ visibleWs && unfocused
-

XMonad/Actions/KeyRemap.hs

@@ -27,11 +27,10 @@ module XMonad.Actions.KeyRemap (
   ) where
 
 import XMonad
+import XMonad.Prelude
 import XMonad.Util.Paste
-import Data.List
 
 import qualified XMonad.Util.ExtensibleState as XS
-import Control.Monad
 
 
 data KeymapTable = KeymapTable [((KeyMask, KeySym), (KeyMask, KeySym))] deriving (Typeable, Show)

XMonad/Actions/Launcher.hs

@@ -18,10 +18,9 @@ module XMonad.Actions.Launcher(
   , launcherPrompt
 ) where
 
-import           Data.List       (find, findIndex, isPrefixOf, tails)
 import qualified Data.Map        as M
-import           Data.Maybe      (isJust)
 import           XMonad          hiding (config)
+import           XMonad.Prelude
 import           XMonad.Prompt
 import           XMonad.Util.Run
 

XMonad/Actions/MessageFeedback.hs

@@ -51,13 +51,11 @@ module XMonad.Actions.MessageFeedback
 
 import XMonad               ( Window )
 import XMonad.Core          ( X(), Message, SomeMessage(..), LayoutClass(..), windowset, catchX, WorkspaceId, Layout, whenJust )
-import XMonad.StackSet      ( Workspace, current, workspace, layout, tag )
 import XMonad.Operations    ( updateLayout, windowBracket, modifyWindowSet )
+import XMonad.Prelude       ( isJust, liftA2, void )
+import XMonad.StackSet      ( Workspace, current, workspace, layout, tag )
 
-import Data.Maybe           ( isJust )
-import Control.Monad        ( void )
 import Control.Monad.State  ( gets )
-import Control.Applicative  ( liftA2 )
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:

XMonad/Actions/Minimize.hs

@@ -35,6 +35,7 @@ module XMonad.Actions.Minimize
   ) where
 
 import XMonad
+import XMonad.Prelude (fromMaybe, join, listToMaybe)
 import qualified XMonad.StackSet as W
 
 import qualified XMonad.Layout.BoringWindows as BW
@@ -43,8 +44,6 @@ import XMonad.Util.Minimize
 import XMonad.Util.WindowProperties (getProp32)
 
 import Foreign.C.Types (CLong)
-import Control.Monad (join)
-import Data.Maybe (fromMaybe, listToMaybe)
 import qualified Data.List as L
 import qualified Data.Map as M
 

XMonad/Actions/MouseGestures.hs

@@ -21,14 +21,13 @@ module XMonad.Actions.MouseGestures (
     mkCollect
 ) where
 
+import XMonad.Prelude
 import XMonad
 import XMonad.Util.Types (Direction2D(..))
 
 import Data.IORef
 import qualified Data.Map as M
 import Data.Map (Map)
-import Data.Maybe
-import Control.Monad
 
 -- $usage
 --

XMonad/Actions/Navigation2D.hs

@@ -57,11 +57,10 @@ module XMonad.Actions.Navigation2D ( -- * Usage
                                    , Direction2D(..)
                                    ) where
 
-import Control.Applicative
 import qualified Data.List as L
 import qualified Data.Map as M
-import Data.Maybe
 import Data.Ord (comparing)
+import XMonad.Prelude
 import XMonad hiding (Screen)
 import qualified XMonad.StackSet as W
 import qualified XMonad.Util.ExtensibleState as XS
@@ -890,10 +889,6 @@ swap win winset = W.focusWindow cur
 centerOf :: Rectangle -> (Position, Position)
 centerOf r = (rect_x r + fi (rect_width r) `div` 2, rect_y r + fi (rect_height r) `div` 2)
 
--- | Shorthand for integer conversions
-fi :: (Integral a, Num b) => a -> b
-fi = fromIntegral
-
 -- | Functions to choose the subset of windows to operate on
 thisLayer, otherLayer :: a -> a -> a
 thisLayer  = curry fst

XMonad/Actions/OnScreen.hs

@@ -26,12 +26,9 @@ module XMonad.Actions.OnScreen (
     ) where
 
 import XMonad
+import XMonad.Prelude (fromMaybe, guard)
 import XMonad.StackSet hiding (new)
 
-import Control.Monad (guard)
--- import Control.Monad.State.Class (gets)
-import Data.Maybe (fromMaybe)
-
 
 -- | Focus data definitions
 data Focus = FocusNew                       -- ^ always focus the new screen

XMonad/Actions/PhysicalScreens.hs

@@ -30,11 +30,9 @@ module XMonad.Actions.PhysicalScreens (
                                       ) where
 
 import XMonad
+import XMonad.Prelude (findIndex, on, sortBy)
 import qualified XMonad.StackSet as W
 
-import Data.List (sortBy,findIndex)
-import Data.Function (on)
-
 {- $usage
 
 This module allows you name Xinerama screens from XMonad using their

XMonad/Actions/Plane.hs

@@ -38,11 +38,9 @@ module XMonad.Actions.Plane
     )
     where
 
-import Control.Monad
-import Data.List
 import Data.Map hiding (split)
-import Data.Maybe
 
+import XMonad.Prelude
 import XMonad
 import XMonad.StackSet hiding (workspaces)
 import XMonad.Util.Run

XMonad/Actions/Prefix.hs

@@ -32,9 +32,8 @@ module XMonad.Actions.Prefix
        ) where
 
 import qualified Data.Map as M
-import Data.Maybe
-import Control.Monad (liftM2)
 
+import XMonad.Prelude
 import XMonad
 import XMonad.Util.ExtensibleState as XS
 import XMonad.Util.Paste (sendKey)

XMonad/Actions/RotateSome.hs

@@ -25,7 +25,7 @@ module XMonad.Actions.RotateSome (
   ) where
 
 import Control.Arrow ((***))
-import Data.List (partition, sortOn, (\\))
+import XMonad.Prelude (partition, sortOn, (\\))
 import qualified Data.Map as M
 import XMonad (Window, WindowSpace, Rectangle, X, runLayout, screenRect, windows, withWindowSet)
 import XMonad.StackSet (Screen (Screen), Stack (Stack), current, floating, modify', stack)

XMonad/Actions/Search.hs

@@ -65,13 +65,12 @@ module XMonad.Actions.Search (   -- * Usage
                           ) where
 
 import           Codec.Binary.UTF8.String (encode)
-import           Data.Char                (isAlphaNum, isAscii)
-import           Data.List                (isPrefixOf)
 import           Text.Printf
 import           XMonad                   (X (), liftIO)
 import           XMonad.Prompt            (XPConfig (), XPrompt (showXPrompt, nextCompletion, commandToComplete),
                                            getNextCompletion,
                                            historyCompletionP, mkXPrompt)
+import           XMonad.Prelude           (isAlphaNum, isAscii, isPrefixOf)
 import           XMonad.Prompt.Shell      (getBrowser)
 import           XMonad.Util.Run          (safeSpawn)
 import           XMonad.Util.XSelection   (getSelection)

XMonad/Actions/ShowText.hs

@@ -23,11 +23,10 @@ module XMonad.Actions.ShowText
     , ShowTextConfig(..)
     ) where
 
-import Control.Monad (when)
 import Data.Map (Map,empty,insert,lookup)
-import Data.Monoid (All)
 import Prelude hiding (lookup)
 import XMonad
+import XMonad.Prelude (All, fi, when)
 import XMonad.StackSet (current,screen)
 import XMonad.Util.Font (Align(AlignCenter)
                        , initXMF
@@ -37,7 +36,6 @@ import XMonad.Util.Font (Align(AlignCenter)
 import XMonad.Util.Timer (startTimer)
 import XMonad.Util.XUtils (createNewWindow
                          , deleteWindow
-                         , fi
                          , showWindow
                          , paintAndWrite)
 import qualified XMonad.Util.ExtensibleState as ES

XMonad/Actions/SpawnOn.hs

@@ -29,15 +29,13 @@ module XMonad.Actions.SpawnOn (
 ) where
 
 import Control.Exception (tryJust)
-import Control.Monad (guard)
-import Data.List (isInfixOf)
-import Data.Maybe (isJust)
 import System.IO.Error (isDoesNotExistError)
 import System.IO.Unsafe (unsafePerformIO)
 import System.Posix.Types (ProcessID)
 import Text.Printf (printf)
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
 
 import XMonad.Hooks.ManageHelpers

XMonad/Actions/Submap.hs

@@ -20,10 +20,9 @@ module XMonad.Actions.Submap (
                              submapDefaultWithKey
                             ) where
 import Data.Bits
-import Data.Maybe (fromMaybe)
+import XMonad.Prelude (fix, fromMaybe)
 import XMonad hiding (keys)
 import qualified Data.Map as M
-import Control.Monad.Fix (fix)
 
 {- $usage
 

XMonad/Actions/SwapPromote.hs

@@ -57,15 +57,13 @@ module XMonad.Actions.SwapPromote
 
 
 import           XMonad
+import           XMonad.Prelude
 import qualified XMonad.StackSet                as W
 import qualified XMonad.Util.ExtensibleState    as XS
 
 import qualified Data.Map                       as M
 import qualified Data.Set                       as S
-import           Data.List
-import           Data.Maybe
 import           Control.Arrow
-import           Control.Monad
 
 
 -- $usage

XMonad/Actions/TagWindows.hs

@@ -26,14 +26,12 @@ module XMonad.Actions.TagWindows (
                  TagPrompt,
                  ) where
 
-import Data.List (nub,sortBy)
-import Control.Monad
 import Control.Exception as E
 
-import XMonad.StackSet hiding (filter)
-
-import XMonad.Prompt
 import XMonad hiding (workspaces)
+import XMonad.Prelude
+import XMonad.Prompt
+import XMonad.StackSet hiding (filter)
 
 econst :: Monad m => a -> IOException -> m a
 econst = const . return

XMonad/Actions/TiledWindowDragging.hs

@@ -19,11 +19,11 @@ module XMonad.Actions.TiledWindowDragging
     dragWindow
   )
 where
+
 import           XMonad
+import           XMonad.Prelude
 import qualified XMonad.StackSet               as W
 import           XMonad.Layout.DraggingVisualizer
-import           Control.Monad
-
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
@@ -32,7 +32,7 @@ import           Control.Monad
 -- > import XMonad.Layout.DraggingVisualizer
 --
 -- then edit your 'layoutHook' by adding the draggingVisualizer to your layout:
--- 
+--
 -- > myLayout = draggingVisualizer $ layoutHook def
 --
 -- Then add a mouse binding for 'dragWindow':
@@ -54,10 +54,10 @@ dragWindow window = whenX (isClient window) $ do
 
     mouseDrag
         (\posX posY ->
-          let rect = Rectangle (fInt (fInt winX + (posX - fInt offsetX)))
+          let rect = Rectangle (fi (fi winX + (posX - fi offsetX)))
-                               (fInt (fInt winY + (posY - fInt offsetY)))
+                               (fi (fi winY + (posY - fi offsetY)))
-                               (fInt winWidth)
+                               (fi winWidth)
-                               (fInt winHeight)
+                               (fi winHeight)
           in  sendMessage $ DraggingWindow window rect
         )
         (sendMessage DraggingStopped >> performWindowSwitching window)
@@ -67,13 +67,13 @@ dragWindow window = whenX (isClient window) $ do
 getPointerOffset :: Window -> X (Int, Int)
 getPointerOffset win = do
     (_, _, _, oX, oY, _, _, _) <- withDisplay (\d -> io $ queryPointer d win)
-    return (fInt oX, fInt oY)
+    return (fi oX, fi oY)
 
 -- | return a tuple of windowX, windowY, windowWidth, windowHeight
 getWindowPlacement :: Window -> X (Int, Int, Int, Int)
 getWindowPlacement window = do
     wa <- withDisplay (\d -> io $ getWindowAttributes d window)
-    return (fInt $ wa_x wa, fInt $ wa_y wa, fInt $ wa_width wa, fInt $ wa_height wa)
+    return (fi $ wa_x wa, fi $ wa_y wa, fi $ wa_width wa, fi $ wa_height wa)
 
 
 performWindowSwitching :: Window -> X ()
@@ -91,11 +91,3 @@ performWindowSwitching win = do
     switchEntries a b x | x == a    = b
                         | x == b    = a
                         | otherwise = x
-
-
-
--- | shorthand for fromIntegral
-fInt :: Integral a => Integral b => a -> b
-fInt = fromIntegral
-
-

XMonad/Actions/TopicSpace.hs

@@ -63,15 +63,12 @@ module XMonad.Actions.TopicSpace
 where
 
 import XMonad
+import XMonad.Prelude
 
 import qualified Data.Map.Strict         as M
 import qualified XMonad.Hooks.DynamicLog as DL
 import qualified XMonad.StackSet         as W
 
-import Control.Applicative (liftA2)
-import Control.Monad (replicateM_, unless, when)
-import Data.List ((\\), elemIndex, nub, sort, sortOn)
-import Data.Maybe (fromJust, fromMaybe, isNothing, listToMaybe)
 import System.IO (hClose, hPutStr)
 
 import XMonad.Prompt (XPConfig)

XMonad/Actions/TreeSelect.hs

@@ -64,13 +64,12 @@ module XMonad.Actions.TreeSelect
 
 import Control.Monad.Reader
 import Control.Monad.State
-import Data.List (find)
-import Data.Maybe
 import Data.Tree
 import Foreign
 import System.IO
 import System.Posix.Process (forkProcess, executeFile)
 import XMonad hiding (liftX)
+import XMonad.Prelude
 import XMonad.StackSet as W
 import XMonad.Util.Font
 import XMonad.Util.NamedWindows

XMonad/Actions/UpdateFocus.hs

@@ -20,9 +20,8 @@ module XMonad.Actions.UpdateFocus (
 ) where
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
-import Control.Monad (when)
-import Data.Monoid
 
 -- $usage
 -- To make the focus update on mouse movement within an unfocused window, add the

XMonad/Actions/UpdatePointer.hs

@@ -24,12 +24,11 @@ module XMonad.Actions.UpdatePointer
     where
 
 import XMonad
-import XMonad.Util.XUtils (fi)
+import XMonad.Prelude
-import Control.Arrow
-import Control.Monad
 import XMonad.StackSet (member, peek, screenDetail, current)
-import Data.Maybe
+
-import Control.Exception
+import Control.Exception (SomeException, try)
+import Control.Arrow ((&&&), (***))
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
@@ -107,4 +106,3 @@ lerp r a b = (1 - r) * realToFrac a + r * realToFrac b
 clip :: Ord a => (a, a) -> a -> a
 clip (lower, upper) x = if x < lower then lower
     else if x > upper then upper else x
-

XMonad/Actions/Warp.hs

@@ -22,7 +22,7 @@ module XMonad.Actions.Warp (
                            warpToWindow
                           ) where
 
-import Data.List
+import XMonad.Prelude
 import XMonad
 import XMonad.StackSet as W
 

XMonad/Actions/WindowGo.hs

@@ -36,10 +36,8 @@ module XMonad.Actions.WindowGo (
                  module XMonad.ManageHook
                 ) where
 
-import Control.Monad
-import Data.Char (toLower)
 import qualified Data.List as L (nub,sortBy)
-import Data.Monoid
+import XMonad.Prelude
 import XMonad (Query(), X(), ManageHook, WindowSet, withWindowSet, runQuery, liftIO, ask)
 import Graphics.X11 (Window)
 import XMonad.ManageHook

XMonad/Actions/WindowMenu.hs

@@ -29,7 +29,7 @@ import qualified XMonad.StackSet as W
 import XMonad.Actions.GridSelect
 import XMonad.Layout.Maximize
 import XMonad.Actions.Minimize
-import XMonad.Util.XUtils (fi)
+import XMonad.Prelude (fi)
 
 -- $usage
 --

XMonad/Actions/WindowNavigation.hs

@@ -40,15 +40,14 @@ module XMonad.Actions.WindowNavigation (
                                        ) where
 
 import XMonad
+import XMonad.Prelude (catMaybes, fromMaybe, listToMaybe, sortBy)
 import XMonad.Util.Types (Direction2D(..))
 import qualified XMonad.StackSet as W
 
 import Control.Arrow (second)
 import Data.IORef
-import Data.List (sortBy)
 import Data.Map (Map())
 import qualified Data.Map as M
-import Data.Maybe (catMaybes, fromMaybe, listToMaybe)
 import Data.Ord (comparing)
 import qualified Data.Set as S
 

XMonad/Actions/WithAll.hs

@@ -15,7 +15,7 @@ module XMonad.Actions.WithAll (
     sinkAll, withAll,
     withAll', killAll) where
 
-import Data.Foldable hiding (foldr)
+import XMonad.Prelude hiding (foldr)
 
 import XMonad
 import XMonad.StackSet

XMonad/Actions/WorkspaceNames.hs

@@ -44,6 +44,7 @@ module XMonad.Actions.WorkspaceNames (
     ) where
 
 import XMonad
+import XMonad.Prelude (fromMaybe, isInfixOf, (<&>), (>=>))
 import qualified XMonad.StackSet as W
 import qualified XMonad.Util.ExtensibleState as XS
 
@@ -54,11 +55,7 @@ import XMonad.Prompt (mkXPrompt, XPConfig)
 import XMonad.Prompt.Workspace (Wor(Wor))
 import XMonad.Util.WorkspaceCompare (getSortByIndex)
 
-import Control.Monad ((>=>))
-import Data.Functor ((<&>))
 import qualified Data.Map as M
-import Data.Maybe (fromMaybe)
-import Data.List (isInfixOf)
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@ file:
@@ -177,7 +174,7 @@ workspaceNamePrompt conf job = do
               (job . toWsId pairs)
   where toWsId pairs name = fromMaybe "" (lookup name pairs)
         contains completions input =
-          return $ filter (Data.List.isInfixOf input) completions
+          return $ filter (isInfixOf input) completions
 
 -- | Workspace list transformation for
 -- 'XMonad.Hooks.EwmhDesktops.ewmhDesktopsLogHookCustom' that exposes

XMonad/Config/Bluetile.hs

@@ -62,7 +62,7 @@ import qualified XMonad.StackSet as W
 import qualified Data.Map as M
 
 import System.Exit
-import Control.Monad(when)
+import XMonad.Prelude(when)
 
 -- $usage
 -- To use this module, start with the following @~\/.xmonad\/xmonad.hs@:

XMonad/Config/Dmwit.hs

@@ -4,10 +4,7 @@
 module XMonad.Config.Dmwit where
 
 -- system imports
-import Control.Monad
 import Control.Monad.Trans
-import Data.Char
-import Data.List
 import Data.Map (Map, fromList)
 import Data.Ratio
 import Data.Word
@@ -31,6 +28,7 @@ import XMonad.Layout.Grid
 import XMonad.Layout.IndependentScreens
 import XMonad.Layout.Magnifier
 import XMonad.Layout.NoBorders
+import XMonad.Prelude
 import XMonad.Util.Dzen hiding (x, y)
 import XMonad.Util.SpawnOnce
 -- }}}
@@ -111,7 +109,6 @@ fullscreenMPlayer = className =? "MPlayer" --> do
         Just (16 :% 9)  -> viewFullOn 1 "5" win
         _               -> doFloat
     where
-    fi               = fromIntegral :: Dimension -> Double
     approx (n, d)    = approxRational (fi n / fi d) (1/100)
 
 operationOn f s n w = do

XMonad/Config/Mate.hs

@@ -31,7 +31,7 @@ import XMonad
 import XMonad.Config.Desktop
 import XMonad.Util.Run (safeSpawn)
 import XMonad.Util.Ungrab
-import Data.Char (toUpper)
+import XMonad.Prelude (toUpper)
 
 import qualified Data.Map as M
 

XMonad/Config/Monad.hs

@@ -20,7 +20,7 @@ module XMonad.Config.Monad where
 import XMonad hiding (terminal, keys)
 import qualified XMonad as X
 import Control.Monad.Writer
-import Data.Monoid
+import XMonad.Prelude
 import Data.Accessor
 import Data.Accessor.Basic hiding (set)
 

XMonad/Config/Prime.hs

@@ -115,7 +115,7 @@ ifThenElse,
 import Prelude hiding ((>>), mod)
 import qualified Prelude as P ((>>=), (>>))
 
-import Data.Monoid (All)
+import XMonad.Prelude (All)
 
 import XMonad hiding (xmonad, XConfig(..))
 import XMonad (XConfig(XConfig))

XMonad/Hooks/CurrentWorkspaceOnTop.hs

@@ -25,7 +25,7 @@ module XMonad.Hooks.CurrentWorkspaceOnTop (
 import XMonad
 import qualified XMonad.StackSet as S
 import qualified XMonad.Util.ExtensibleState as XS
-import Control.Monad(when)
+import XMonad.Prelude(when)
 import qualified Data.Map as M
 
 -- $usage

XMonad/Hooks/DebugEvents.hs

@@ -24,6 +24,7 @@ import           Prelude
 import           XMonad                               hiding (windowEvent
                                                              ,(-->)
                                                              )
+import           XMonad.Prelude                       hiding (fi, bool)
 
 import           XMonad.Hooks.DebugKeyEvents                 (debugKeyEvents)
 import           XMonad.Util.DebugWindow                     (debugWindow)
@@ -33,15 +34,7 @@ import           XMonad.Util.DebugWindow                     (debugWindow)
 import           Control.Exception                    as E
 import           Control.Monad.State
 import           Control.Monad.Reader
-import           Data.Char                                   (isDigit)
-import           Data.Maybe                                  (fromJust)
-import           Data.List                                   (genericIndex
-                                                             ,genericLength
-                                                             ,unfoldr
-                                                             )
 import           Codec.Binary.UTF8.String
-import           Data.Maybe                                  (fromMaybe)
-import           Data.Monoid
 import           Foreign
 import           Foreign.C.Types
 import           Numeric                                     (showHex)
@@ -286,7 +279,7 @@ newtype Decoder a = Decoder (ReaderT Decode (StateT DecodeState X) a)
 #endif
 
 -- | Retrive, parse, and dump a window property.  As all the high-level property
---   interfaces lose information necessary to decode properties correctly, we 
+--   interfaces lose information necessary to decode properties correctly, we
 --   work at the lowest level available.
 dumpProperty          :: Atom -> String -> Window -> Int -> X String
 dumpProperty a n w i  =  do
@@ -413,8 +406,8 @@ runDecode c s (Decoder p) =  runStateT (runReaderT p c) s
 bytes   :: Int -> Int
 bytes w =  w `div` 8
 
--- | The top level property decoder, for a wide variety of standard ICCCM and 
+-- | The top level property decoder, for a wide variety of standard ICCCM and
---   EWMH window properties.  We pass part of the 'ReaderT' as arguments for 
+--   EWMH window properties.  We pass part of the 'ReaderT' as arguments for
 --   pattern matching.
 dumpProp                                              :: Atom -> String -> Decoder Bool
 
@@ -900,7 +893,7 @@ dumpMwmInfo =  do
   guardType ta $ dumpList' [("flags" ,dumpBits mwmHints,cARDINAL)
                            ,("window",dumpWindow       ,wINDOW  )
                            ]
-             
+
 -- the most common case
 dumpEnum    :: [String] -> Decoder Bool
 dumpEnum ss =  dumpEnum' ss cARDINAL
@@ -1000,7 +993,7 @@ dumpMDPrereg =  do
         append "total size = "
         withIndent 13 dump32
         dumpMDBlocks $ fromIntegral dsc
-    
+
 dumpMDBlocks   :: Int -> Decoder Bool
 dumpMDBlocks _ =  propSimple "(drop site info)" -- @@@ maybe later if needed
 
@@ -1024,7 +1017,7 @@ dumpPercent =  guardType cARDINAL $ do
                  n <- getInt' 32
                  case n of
                    Nothing -> return False
-                   Just n' -> 
+                   Just n' ->
                        let pct = 100 * fromIntegral n' / fromIntegral (maxBound :: Word32)
                            pct :: Double
                         in append $ show (round pct :: Integer) ++ "%"

XMonad/Hooks/DebugKeyEvents.hs

@@ -19,6 +19,7 @@ module XMonad.Hooks.DebugKeyEvents (-- * Usage
                                    ) where
 
 import           XMonad.Core
+import           XMonad.Prelude
 import           XMonad.Operations               (cleanMask)
 
 import           Graphics.X11.Xlib
@@ -26,8 +27,6 @@ import           Graphics.X11.Xlib.Extras
 
 import           Control.Monad.State             (gets)
 import           Data.Bits
-import           Data.List                       (intercalate)
-import           Data.Monoid
 import           Numeric                         (showHex)
 import           System.IO                       (hPutStrLn
                                                  ,stderr)

XMonad/Hooks/DebugStack.hs

@@ -24,6 +24,7 @@ module XMonad.Hooks.DebugStack (debugStack
                                ) where
 
 import           XMonad.Core
+import           XMonad.Prelude
 import qualified XMonad.StackSet                                       as W
 
 import           XMonad.Util.DebugWindow
@@ -31,10 +32,7 @@ import           XMonad.Util.DebugWindow
 import           Graphics.X11.Types                  (Window)
 import           Graphics.X11.Xlib.Extras            (Event)
 
-import           Control.Monad                       (foldM)
 import           Data.Map                            (member)
-import           Data.Monoid                         (All(..))
-import           Data.List                           (intercalate)
 
 -- | Print the state of the current window stack for the current workspace to
 --   @stderr@, which for most installations goes to @~/.xsession-errors@.

XMonad/Hooks/DynamicBars.hs

@@ -29,15 +29,9 @@ module XMonad.Hooks.DynamicBars (
 
 import Prelude
 
-import Control.Monad
 import Control.Monad.Trans (lift)
 import Control.Monad.Writer (WriterT, execWriterT, tell)
 
-import Data.List
-import Data.Maybe
-import Data.Monoid
-import Data.Foldable (traverse_)
-
 import Graphics.X11.Xinerama
 import Graphics.X11.Xlib
 import Graphics.X11.Xlib.Extras
@@ -46,6 +40,7 @@ import Graphics.X11.Xrandr
 import System.IO
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
 import XMonad.Hooks.DynamicLog
 import qualified XMonad.Util.ExtensibleState as XS

XMonad/Hooks/DynamicHooks.hs

@@ -23,12 +23,9 @@ module XMonad.Hooks.DynamicHooks (
   ) where
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.Util.ExtensibleState as XS
 
-import Data.List
-import Data.Maybe (listToMaybe)
-import Data.Monoid
-
 -- $usage
 -- Provides two new kinds of 'ManageHooks' that can be defined at runtime.
 --

XMonad/Hooks/DynamicIcons.hs

@@ -33,9 +33,7 @@ import qualified XMonad.StackSet as S
 import qualified Data.Map as M
 
 import XMonad.Hooks.DynamicLog
-import Data.Functor ((<&>))
+import XMonad.Prelude (for, (<&>), (<=<), (>=>))
-import Data.Traversable (for)
-import Control.Monad ((<=<), (>=>))
 
 -- $usage
 -- Dynamically augment Workspace's 'WorkspaceId' as shown on a status bar

XMonad/Hooks/DynamicProperty.hs

@@ -26,8 +26,7 @@
 module XMonad.Hooks.DynamicProperty where
 
 import XMonad
-import Data.Monoid
+import XMonad.Prelude
-import Control.Monad (when)
 
 -- |
 -- Run a 'ManageHook' when a specific property is changed on a window. Note
@@ -36,7 +35,7 @@ import Control.Monad (when)
 -- their titles on the fly!):
 --
 -- dynamicPropertyChange "WM_NAME" (className =? "Iceweasel" <&&> title =? "whatever" --> doShift "2")
--- 
+--
 -- Note that the fixity of (-->) won't allow it to be mixed with ($), so you
 -- can't use the obvious $ shorthand.
 --
@@ -46,9 +45,9 @@ import Control.Monad (when)
 -- other 'ManageHook':
 --
 -- >      , handleEventHook = dynamicPropertyChange "WM_NAME" myDynHook <+> handleEventHook baseConfig
--- > 
+-- >
 -- >    {- ... -}
--- > 
+-- >
 -- >    myDynHook = composeAll [...]
 --
 dynamicPropertyChange :: String -> ManageHook -> Event -> X All

XMonad/Hooks/EwmhDesktops.hs

@@ -33,18 +33,14 @@ module XMonad.Hooks.EwmhDesktops (
 
 import Codec.Binary.UTF8.String (encode)
 import Data.Bits
-import Data.List
-import Data.Maybe
-import Data.Monoid
 import qualified Data.Map.Strict as M
 
 import XMonad
-import Control.Monad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
 
 import XMonad.Hooks.SetWMName
 import qualified XMonad.Util.ExtensibleState as E
-import XMonad.Util.XUtils (fi)
 import XMonad.Util.WorkspaceCompare
 import XMonad.Util.WindowProperties (getProp32)
 import qualified XMonad.Util.ExtensibleState as XS

XMonad/Hooks/FadeInactive.hs

@@ -27,9 +27,8 @@ module XMonad.Hooks.FadeInactive (
     ) where
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
-import Control.Applicative (liftA2)
-import Control.Monad
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:

XMonad/Hooks/FadeWindows.hs

@@ -49,6 +49,7 @@ module XMonad.Hooks.FadeWindows (-- * Usage
                                 ) where
 
 import           XMonad.Core
+import           XMonad.Prelude
 import           XMonad.ManageHook                       (liftX)
 import qualified XMonad.StackSet             as W
 
@@ -56,12 +57,10 @@ import           XMonad.Hooks.FadeInactive               (setOpacity
                                                          ,isUnfocused
                                                          )
 
-import           Control.Monad                           (forM_)
 import           Control.Monad.Reader                    (ask
                                                          ,asks)
 import           Control.Monad.State                     (gets)
 import qualified Data.Map                    as M
-import           Data.Monoid
 
 import           Graphics.X11.Xlib.Extras                (Event(..))
 

XMonad/Hooks/Focus.hs

@@ -62,14 +62,11 @@ module XMonad.Hooks.Focus
     )
   where
 
-import Data.Maybe
+import Control.Arrow ((&&&))
-import Data.Monoid
-import qualified Data.Semigroup as S
-import Control.Monad
 import Control.Monad.Reader
-import Control.Arrow hiding ((<+>))
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
 import qualified XMonad.Util.ExtensibleState as XS
 import XMonad.Hooks.ManageHelpers (currentWs)
@@ -385,8 +382,8 @@ instance MonadReader Focus FocusQuery where
     local f (FocusQuery mx) = FocusQuery (local f mx)
 instance MonadIO FocusQuery where
     liftIO mx       = FocusQuery (liftIO mx)
-instance S.Semigroup a => S.Semigroup (FocusQuery a) where
+instance Semigroup a => Semigroup (FocusQuery a) where
-    (<>)            = liftM2 (S.<>)
+    (<>)            = liftM2 (<>)
 instance Monoid a => Monoid (FocusQuery a) where
     mempty          = return mempty
     mappend         = (<>)
@@ -577,4 +574,3 @@ activateOnCurrentWs = manageFocus (liftQuery activated <&&> newOnCur --> switchF
 activateOnCurrentKeepFocus :: ManageHook
 activateOnCurrentKeepFocus  = manageFocus (liftQuery activated <&&> newOnCur --> keepFocus)
                         <+> activateOnCurrent'
-

XMonad/Hooks/InsertPosition.hs

@@ -21,10 +21,8 @@ module XMonad.Hooks.InsertPosition (
     ) where
 
 import XMonad(ManageHook, MonadReader(ask))
+import XMonad.Prelude (Endo (Endo), find, fromMaybe)
 import qualified XMonad.StackSet as W
-import Data.Maybe(fromMaybe)
-import Data.List(find)
-import Data.Monoid(Endo(Endo))
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:

XMonad/Hooks/ManageDebug.hs

@@ -29,11 +29,11 @@ module XMonad.Hooks.ManageDebug (debugManageHook
                                 ) where
 
 import           XMonad
+import           XMonad.Prelude (when)
 import           XMonad.Hooks.DebugStack
 import           XMonad.Util.DebugWindow
 import           XMonad.Util.EZConfig
 import qualified XMonad.Util.ExtensibleState                                                 as XS
-import           Control.Monad                            (when)
 
 -- persistent state for manageHook debugging to trigger logHook debugging
 data ManageStackDebug = MSD (Bool,Bool) deriving Typeable

XMonad/Hooks/ManageDocks.hs

@@ -39,14 +39,11 @@ import Foreign.C.Types (CLong)
 import XMonad.Layout.LayoutModifier
 import XMonad.Util.Types
 import XMonad.Util.WindowProperties (getProp32s)
-import XMonad.Util.XUtils (fi)
 import qualified XMonad.Util.ExtensibleState as XS
-import Data.Monoid (All(..))
+import XMonad.Prelude (All (..), fi, filterM, foldlM, void, when, (<=<))
 
 import qualified Data.Set as S
 import qualified Data.Map as M
-import Control.Monad (when, filterM, void, (<=<))
-import Data.Foldable (foldlM)
 
 -- $usage
 -- To use this module, add the following import to @~\/.xmonad\/xmonad.hs@:

XMonad/Hooks/ManageHelpers.hs

@@ -59,14 +59,10 @@ module XMonad.Hooks.ManageHelpers (
 ) where
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
 import XMonad.Util.WindowProperties (getProp32s)
 
-import Control.Monad (filterM)
-import Data.List ((\\))
-import Data.Maybe
-import Data.Monoid
-
 import System.Posix (ProcessID)
 
 -- | Denotes a side of a screen. @S@ stands for South, @NE@ for Northeast

XMonad/Hooks/Minimize.hs

@@ -19,11 +19,9 @@ module XMonad.Hooks.Minimize
       minimizeEventHook
     ) where
 
-import Data.Monoid
-import Control.Monad(when)
-
 import XMonad
 import XMonad.Actions.Minimize
+import XMonad.Prelude
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:

XMonad/Hooks/Place.hs

@@ -34,18 +34,14 @@ module XMonad.Hooks.Place   ( -- * Usage
 
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as S
 
 import XMonad.Layout.WindowArranger
 import XMonad.Actions.FloatKeys
-import XMonad.Util.XUtils
 
 import qualified Data.Map as M
 import Data.Ratio ((%))
-import Data.List (sortBy, minimumBy, partition)
-import Data.Maybe (fromMaybe, catMaybes)
-import Data.Monoid (Endo(..))
-import Control.Monad (guard, join)
 import Control.Monad.Trans (lift)
 
 -- $usage

XMonad/Hooks/PositionStoreHooks.hs

@@ -34,15 +34,13 @@ module XMonad.Hooks.PositionStoreHooks (
     ) where
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
 import XMonad.Util.PositionStore
 import XMonad.Hooks.ManageDocks
 import XMonad.Layout.Decoration
 
 import System.Random(randomRIO)
-import Control.Monad(when)
-import Data.Maybe
-import Data.Monoid
 import qualified Data.Set as S
 
 -- $usage

XMonad/Hooks/RefocusLast.hs

@@ -45,16 +45,13 @@ module XMonad.Hooks.RefocusLast (
 ) where
 
 import XMonad
+import XMonad.Prelude (All (..), asum, fromMaybe, when)
 import qualified XMonad.StackSet as W
 import qualified XMonad.Util.ExtensibleState as XS
 import XMonad.Util.Stack (findS, mapZ_)
 import XMonad.Layout.LayoutModifier
 
-import Data.Maybe (fromMaybe)
-import Data.Monoid (All(..))
-import Data.Foldable (asum)
 import qualified Data.Map.Strict as M
-import Control.Monad (when)
 
 -- }}}
 
@@ -292,4 +289,3 @@ withRecents :: (Window -> Window -> X ()) -> X ()
 withRecents f = withWindowSet $ \ws -> withRecentsIn (W.currentTag ws) () f
 
 -- }}}
-

XMonad/Hooks/RestoreMinimized.hs

@@ -22,7 +22,7 @@ module XMonad.Hooks.RestoreMinimized
     , restoreMinimizedEventHook
     ) where
 
-import Data.Monoid
+import XMonad.Prelude
 
 import XMonad
 

XMonad/Hooks/ScreenCorners.hs

@@ -30,10 +30,8 @@ module XMonad.Hooks.ScreenCorners
     , screenCornerLayoutHook
     ) where
 
-import Data.Monoid
+import XMonad.Prelude
-import Data.List (find)
 import XMonad
-import XMonad.Util.XUtils (fi)
 import XMonad.Layout.LayoutModifier
 
 import qualified Data.Map as M

XMonad/Hooks/ServerMode.hs

@@ -26,12 +26,10 @@ module XMonad.Hooks.ServerMode
     , serverModeEventHookF
     ) where
 
-import Control.Monad (when)
-import Data.Maybe
-import Data.Monoid
 import System.IO
 
 import XMonad
+import XMonad.Prelude
 import XMonad.Actions.Commands
 
 -- $usage
@@ -47,7 +45,7 @@ import XMonad.Actions.Commands
 -- in stderr (so that you can read it in @~\/.xsession-errors@). Uses "XMonad.Actions.Commands#defaultCommands" as the default.
 --
 -- > main = xmonad def { handleEventHook = serverModeEventHook }
--- 
+--
 -- > xmonadctl 0 # tells xmonad to output command list
 -- > xmonadctl 1 # tells xmonad to switch to workspace 1
 --

XMonad/Hooks/SetWMName.hs

@@ -41,15 +41,11 @@ module XMonad.Hooks.SetWMName (
     )
   where
 
-import Control.Monad (join)
-import Data.Char (ord)
-import Data.List (nub)
-import Data.Maybe (fromJust, listToMaybe, maybeToList)
 import Foreign.C.Types (CChar)
-
 import Foreign.Marshal.Alloc (alloca)
 
 import XMonad
+import XMonad.Prelude (fromJust, join, listToMaybe, maybeToList, nub, ord)
 
 -- | sets WM name
 setWMName :: String -> X ()
@@ -117,4 +113,3 @@ getSupportWindow = withDisplay $ \dpy -> do
 -- | Get WM name.
 getWMName :: X String
 getWMName = getSupportWindow >>= runQuery title
-

XMonad/Hooks/StatusBar.hs

@@ -53,7 +53,6 @@ module XMonad.Hooks.StatusBar (
   ) where
 
 import Control.Exception (SomeException, try)
-import Control.Monad (void)
 import qualified Codec.Binary.UTF8.String as UTF8 (encode)
 import System.Posix.Signals (sigTERM, signalProcessGroup)
 import System.Posix.Types (ProcessID)
@@ -63,6 +62,7 @@ import qualified Data.Map        as M
 import Foreign.C (CChar)
 
 import XMonad
+import XMonad.Prelude (void)
 
 import XMonad.Util.Run
 import qualified XMonad.Util.ExtensibleState as XS

XMonad/Hooks/StatusBar/PP.hs

@@ -1,5 +1,5 @@
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE NamedFieldPuns      #-}
+{-# LANGUAGE PatternGuards       #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  XMonad.Hooks.StatusBar.PP
@@ -46,15 +46,10 @@ module XMonad.Hooks.StatusBar.PP (
 
     ) where
 
-import Control.Applicative (liftA2)
-import Control.Monad (msum)
-import Data.Char (isSpace)
-import Data.List (intercalate, isPrefixOf, sortOn, stripPrefix)
-import Data.Maybe (catMaybes, fromMaybe, isJust, mapMaybe)
-
 import qualified XMonad.StackSet as S
 
 import XMonad
+import XMonad.Prelude
 
 import XMonad.Util.NamedWindows
 import XMonad.Util.WorkspaceCompare

XMonad/Hooks/ToggleHook.hs

@@ -39,9 +39,9 @@ module XMonad.Hooks.ToggleHook ( -- * Usage
 import Prelude hiding (all)
 
 import XMonad
+import XMonad.Prelude (guard, join)
 import qualified XMonad.Util.ExtensibleState as XS
 
-import Control.Monad (join,guard)
 import Control.Arrow (first, second)
 
 import Data.Map

XMonad/Hooks/UrgencyHook.hs

@@ -70,6 +70,7 @@ module XMonad.Hooks.UrgencyHook (
                                  ) where
 
 import XMonad
+import XMonad.Prelude (delete, fromMaybe, listToMaybe, maybeToList, when, (\\))
 import qualified XMonad.StackSet as W
 
 import XMonad.Hooks.ManageHelpers (windowTag)
@@ -79,10 +80,7 @@ import XMonad.Util.NamedWindows (getName)
 import XMonad.Util.Timer (TimerId, startTimer, handleTimer)
 import XMonad.Util.WindowProperties (getProp32)
 
-import Control.Monad (when)
 import Data.Bits (testBit)
-import Data.List (delete, (\\))
-import Data.Maybe (listToMaybe, maybeToList, fromMaybe)
 import qualified Data.Set as S
 import System.IO (hPutStrLn, stderr)
 import Foreign.C.Types (CLong)

XMonad/Hooks/WallpaperSetter.hs

@@ -24,6 +24,7 @@ module XMonad.Hooks.WallpaperSetter (
   -- $todo
 ) where
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as S
 import qualified XMonad.Util.ExtensibleState as XS
 
@@ -34,13 +35,8 @@ import System.FilePath ((</>))
 import System.Random (randomRIO)
 
 import qualified Data.Map as M
-import Data.List (sortBy)
-import Data.Char (isAlphaNum)
 import Data.Ord (comparing)
 
-import Control.Monad
-import Data.Maybe
-
 -- $usage
 -- This module requires imagemagick and feh to be installed, as these are utilized
 -- for the required image transformations and the actual setting of the wallpaper.

XMonad/Hooks/WindowSwallowing.hs

@@ -44,14 +44,12 @@ module XMonad.Hooks.WindowSwallowing
   )
 where
 import           XMonad
+import           XMonad.Prelude
 import qualified XMonad.StackSet               as W
 import qualified XMonad.Util.ExtensibleState   as XS
 import           XMonad.Util.WindowProperties
 import           XMonad.Util.Run                ( runProcessWithInput )
-import           Data.Semigroup                 ( All(..) )
 import qualified Data.Map.Strict               as M
-import           Data.List                      ( isInfixOf )
-import           Control.Monad                  ( when )
 
 -- $usage
 -- You can use this module by including  the following in your @~\/.xmonad/xmonad.hs@:
@@ -237,9 +235,3 @@ instance ExtensionClass SwallowingState where
                                  , stackBeforeWindowClosing = Nothing
                                  , floatingBeforeClosing    = mempty
                                  }
-
-
-fi :: (Integral a, Num b) => a -> b
-fi = fromIntegral
-
-

XMonad/Hooks/WorkspaceByPos.hs

@@ -21,11 +21,10 @@ module XMonad.Hooks.WorkspaceByPos (
     ) where
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
-import XMonad.Util.XUtils (fi)
 
-import Data.Maybe
+import Control.Monad.Except (lift, runExceptT, throwError)
-import Control.Monad.Error ((<=<),guard,lift,runErrorT,throwError)
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
@@ -43,7 +42,7 @@ needsMoving :: Window -> X (Maybe WorkspaceId)
 needsMoving w = withDisplay $ \d -> do
     -- only relocate windows with non-zero position
     wa <- io $ getWindowAttributes d w
-    fmap (const Nothing `either` Just) . runErrorT $ do
+    fmap (const Nothing `either` Just) . runExceptT $ do
         guard $ wa_x wa /= 0 || wa_y wa /= 0
         ws <- gets windowset
         sc <- lift $ fromMaybe (W.current ws)

XMonad/Hooks/WorkspaceHistory.hs

@@ -34,7 +34,7 @@ import           Prelude
 
 import XMonad
 import XMonad.StackSet hiding (delete, filter, new)
-import Data.List (delete, find, foldl', groupBy, nub, sortBy)
+import XMonad.Prelude (delete, find, foldl', groupBy, nub, sortBy)
 import qualified XMonad.Util.ExtensibleState as XS
 
 -- $usage

XMonad/Hooks/XPropManage.hs

@@ -19,12 +19,10 @@ module XMonad.Hooks.XPropManage (
                  ) where
 
 import Control.Exception as E
-import Data.Char (chr)
-import Data.Monoid (Endo(..))
-
 import Control.Monad.Trans (lift)
 
 import XMonad
+import XMonad.Prelude (Endo (..), chr)
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:

XMonad/Layout/AutoMaster.hs

@@ -20,7 +20,7 @@ module XMonad.Layout.AutoMaster (
                              -- $usage
                              autoMaster, AutoMaster
                             ) where
-import Control.Monad
+import XMonad.Prelude
 
 import XMonad
 import qualified XMonad.StackSet as W

XMonad/Layout/AvoidFloats.hs

@@ -26,11 +26,10 @@ module XMonad.Layout.AvoidFloats (
 
 import XMonad
 import XMonad.Layout.LayoutModifier
+import XMonad.Prelude (fi, maximumBy, maybeToList, sortBy)
 import qualified XMonad.StackSet as W
 
-import Data.List
 import Data.Ord
-import Data.Maybe
 import qualified Data.Map as M
 import qualified Data.Set as S
 
@@ -116,7 +115,7 @@ instance LayoutModifier AvoidFloats Window where
             toRect :: WindowAttributes -> Rectangle
             toRect wa = let b = fi $ wa_border_width wa
                         in Rectangle (fi $ wa_x wa) (fi $ wa_y wa) (fi $ wa_width wa + 2*b) (fi $ wa_height wa + 2*b)
-            
+
             bigEnough :: Rectangle -> Bool
             bigEnough rect = rect_width rect >= fi (minw lm) && rect_height rect >= fi (minh lm)
 
@@ -218,9 +217,6 @@ findGaps br rs = let (gaps,end) = foldr findGaps' ([], left br) $ sortBy (flip $
         inBounds :: Rectangle -> Bool
         inBounds r = left r < right br && left br < right r
 
-fi :: (Integral a, Num b) => a -> b
-fi x = fromIntegral x
-
 (?:) :: Maybe a -> [a] -> [a]
 Just x ?: xs = x:xs
 _ ?: xs = xs

XMonad/Layout/BinarySpacePartition.hs

@@ -34,6 +34,7 @@ module XMonad.Layout.BinarySpacePartition (
   ) where
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
 import XMonad.Util.Stack hiding (Zipper)
 import XMonad.Util.Types
@@ -45,9 +46,6 @@ import XMonad.Util.XUtils
 
 import qualified Data.Map as M
 import qualified Data.Set as S
-import Data.List ((\\), elemIndex, foldl')
-import Data.Maybe (fromMaybe, isNothing, isJust, mapMaybe, catMaybes)
-import Control.Monad
 import Data.Ratio ((%))
 
 -- $usage

XMonad/Layout/BorderResize.hs

@@ -31,7 +31,7 @@ import XMonad
 import XMonad.Layout.Decoration
 import XMonad.Layout.WindowArranger
 import XMonad.Util.XUtils
-import Control.Monad(when)
+import XMonad.Prelude(when)
 import qualified Data.Map as M
 
 -- $usage

XMonad/Layout/BoringWindows.hs

@@ -36,8 +36,8 @@ import XMonad.Layout.LayoutModifier(ModifiedLayout(..),
                                     LayoutModifier(handleMessOrMaybeModifyIt, redoLayout))
 import XMonad(Typeable, LayoutClass, Message, X, fromMessage,
               broadcastMessage, sendMessage, windows, withFocused, Window)
-import Data.List((\\), union)
+import XMonad.Prelude (fromMaybe, listToMaybe, maybeToList, union, (\\))
-import Data.Maybe(fromMaybe, listToMaybe, maybeToList)
+import XMonad.Util.Stack (reverseS)
 import qualified Data.Map as M
 import qualified XMonad.StackSet as W
 

XMonad/Layout/Circle.hs

@@ -20,7 +20,7 @@ module XMonad.Layout.Circle (
                              Circle (..)
                             ) where -- actually it's an ellipse
 
-import Data.List
+import XMonad.Prelude
 import XMonad
 import XMonad.StackSet (integrate, peek)
 

XMonad/Layout/Combo.hs

@@ -22,9 +22,8 @@ module XMonad.Layout.Combo (
                             CombineTwo
                            ) where
 
-import Data.List ( delete, intersect, (\\) )
-import Data.Maybe ( isJust )
 import XMonad hiding (focus)
+import XMonad.Prelude (delete, intersect, isJust, (\\))
 import XMonad.StackSet ( integrate', Workspace (..), Stack(..) )
 import XMonad.Layout.WindowNavigation ( MoveWindowToWindow(..) )
 import qualified XMonad.StackSet as W ( differentiate )

XMonad/Layout/ComboP.hs

@@ -24,9 +24,7 @@ module XMonad.Layout.ComboP (
                              Property(..)
                             ) where
 
-import Data.List ( delete, intersect, (\\) )
+import XMonad.Prelude
-import Data.Maybe ( isJust )
-import Control.Monad
 import XMonad hiding (focus)
 import XMonad.StackSet ( Workspace (..), Stack(..) )
 import XMonad.Layout.WindowNavigation

XMonad/Layout/Cross.hs

@@ -19,7 +19,7 @@ module XMonad.Layout.Cross(
 
 import XMonad( Dimension, Rectangle(..), LayoutClass(..), Resize(..), fromMessage )
 import XMonad.StackSet( focus, up, down )
-import Control.Monad( msum )
+import XMonad.Prelude( msum )
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:

XMonad/Layout/Decoration.hs

@@ -36,12 +36,10 @@ module XMonad.Layout.Decoration
     , DecorationState, OrigWin
     ) where
 
-import Control.Monad (when)
-import Data.Maybe
-import Data.List
 import Foreign.C.Types(CInt)
 
 import XMonad
+import XMonad.Prelude
 import qualified XMonad.StackSet as W
 import XMonad.Hooks.UrgencyHook
 import XMonad.Layout.LayoutModifier

XMonad/Layout/DecorationAddons.hs

@@ -30,7 +30,7 @@ import XMonad.Hooks.ManageDocks
 import XMonad.Util.Font
 import XMonad.Util.PositionStore
 
-import Data.Maybe
+import XMonad.Prelude
 import qualified Data.Set as S
 
 minimizeButtonOffset :: Int

XMonad/Layout/Dishes.hs

@@ -23,7 +23,7 @@ module XMonad.Layout.Dishes (
 
 import XMonad
 import XMonad.StackSet (integrate)
-import Control.Monad (ap)
+import XMonad.Prelude (ap)
 
 -- $usage
 -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:

XMonad/Layout/Dwindle.hs

@@ -27,7 +27,7 @@ module XMonad.Layout.Dwindle ( -- * Usage
                              , Chirality(..)
                              ) where
 
-import Data.List ( unfoldr )
+import XMonad.Prelude ( unfoldr )
 import XMonad
 import XMonad.StackSet ( integrate, Stack )
 import XMonad.Util.Types ( Direction2D(..) )

XMonad/Layout/FixedColumn.hs

@@ -22,8 +22,6 @@ module XMonad.Layout.FixedColumn (
         FixedColumn(..)
 ) where
 
-import Control.Monad (msum)
-import Data.Maybe (fromMaybe)
 import Graphics.X11.Xlib (Window, rect_width)
 import Graphics.X11.Xlib.Extras ( getWMNormalHints
                                 , getWindowAttributes
@@ -31,6 +29,7 @@ import Graphics.X11.Xlib.Extras ( getWMNormalHints
                                 , sh_resize_inc
                                 , wa_border_width)
 
+import XMonad.Prelude (fromMaybe, msum)
 import XMonad.Core (X, LayoutClass(..), fromMessage, io, withDisplay)
 import XMonad.Layout (Resize(..), IncMasterN(..), tile)
 import XMonad.StackSet as W

XMonad/Layout/Fullscreen.hs

@@ -32,6 +32,7 @@ module XMonad.Layout.Fullscreen
     ) where
 
 import           XMonad
+import           XMonad.Prelude
 import           XMonad.Layout.LayoutModifier
 import           XMonad.Layout.NoBorders        (SmartBorder, smartBorders)
 import           XMonad.Hooks.EwmhDesktops      (fullscreenStartup)
@@ -40,11 +41,7 @@ import           XMonad.Util.WindowProperties
 import qualified XMonad.Util.Rectangle          as R
 import qualified XMonad.StackSet                as W
 
-import           Data.List
-import           Data.Maybe
-import           Data.Monoid
 import qualified Data.Map                       as M
-import           Control.Monad
 import           Control.Arrow                  (second)
 
 -- $usage

XMonad/Layout/Gaps.hs

@@ -35,14 +35,12 @@ module XMonad.Layout.Gaps (
                           weakModifyGaps, modifyGap, setGaps, setGap
                           ) where
 
+import XMonad.Prelude (delete, fi)
 import XMonad.Core
 import Graphics.X11 (Rectangle(..))
 
 import XMonad.Layout.LayoutModifier
 import XMonad.Util.Types (Direction2D(..))
-import XMonad.Util.XUtils (fi)
-
-import Data.List (delete)
 
 -- $usage
 -- You can use this module by importing it into your @~\/.xmonad\/xmonad.hs@ file:

XMonad/Layout/GridVariants.hs

@@ -27,7 +27,7 @@ module XMonad.Layout.GridVariants ( -- * Usage
                                   , Orientation(..)
                                   ) where
 
-import Control.Monad
+import XMonad.Prelude
 import XMonad
 import qualified XMonad.StackSet as W
 

XMonad/Layout/Groups.hs

@@ -54,15 +54,12 @@ module XMonad.Layout.Groups ( -- * Usage
                             ) where
 
 import XMonad
+import XMonad.Prelude hiding (group)
 import qualified XMonad.StackSet as W
 
 import XMonad.Util.Stack
 
-import Data.Maybe (isJust, isNothing, fromMaybe, catMaybes, fromJust)
-import Data.List ((\\))
 import Control.Arrow ((>>>))
-import Control.Applicative ((<|>))
-import Control.Monad (forM,void)
 
 -- $usage
 -- This module provides a layout combinator that allows you

XMonad/Layout/Groups/Helpers.hs

@@ -47,7 +47,7 @@ import qualified XMonad.Layout.Groups as G
 
 import XMonad.Actions.MessageFeedback (sendMessageB)
 
-import Control.Monad (unless)
+import XMonad.Prelude (unless)
 import qualified Data.Map as M
 
 -- $usage

XMonad/Layout/HintedGrid.hs

@@ -24,10 +24,10 @@ module XMonad.Layout.HintedGrid (
 import Prelude hiding ((.))
 
 import XMonad
+import XMonad.Prelude (replicateM, sortBy)
 import XMonad.StackSet
 
-import Control.Monad.State
+import Control.Monad.State (runState)
-import Data.List
 import Data.Ord
 
 infixr 9 .