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-- Common ways to select workspaces
module Rahm.Desktop.Workspaces where
import Prelude hiding ((!!))
import Control.Monad.Trans.Maybe
import Control.Arrow (second, (&&&))
import qualified XMonad.StackSet as W
import XMonad
import Data.List.Safe ((!!))
import Rahm.Desktop.Common
import Rahm.Desktop.History
import XMonad.Actions.DynamicWorkspaces
import Data.List (sortOn, sort, sortBy, find)
import Data.Maybe (mapMaybe, fromMaybe)
import Data.Char (isUpper, toUpper, toLower, isAlphaNum)
newtype Selector = Selector (forall a. (a -> Bool) -> [a] -> Maybe a)
data WorkspaceState = Current | Hidden | Visible
deriving (Ord, Eq, Enum)
-- Returns all the workspaces that are either visible, current or Hidden but
-- have windows and that workspace's state.
--
-- In other words, filters out workspaces that have no windows and are not
-- visible.
--
-- This function will sort the result by the workspace tag.
getPopulatedWorkspaces ::
W.StackSet String l a sid sd -> [(WorkspaceState, W.Workspace String l a)]
getPopulatedWorkspaces (W.StackSet (W.Screen cur _ _) vis hi _) =
filter ((/="*") . W.tag . snd) $
sortOn (W.tag . snd) $
mapMaybe (\w@(W.Workspace _ _ s) -> fmap (const (Hidden, w)) s) hi ++
map (\(W.Screen w _ _) -> (Visible, w)) vis ++
[(Current, cur)]
next :: Selector
next = Selector $ \f l -> select f l l
where select f (x:y:xs) _ | f x = Just y
select f [x] (y:_) | f x = Just y
select f (x:xs) orig = select f xs orig
select f _ _ = Nothing
prev :: Selector
prev = Selector $ \f l ->
let (Selector fn) = next in fn f (reverse l)
lastWorkspaceId :: X WorkspaceId
lastWorkspaceId =
W.tag . snd . last <$> withWindowSet (return . getPopulatedWorkspaces)
firstWorkspaceId :: X WorkspaceId
firstWorkspaceId =
W.tag . snd . head <$> withWindowSet (return . getPopulatedWorkspaces)
windowsInCurrentWorkspace :: X [Window]
windowsInCurrentWorkspace = withWindowSet $
\(W.StackSet (W.Screen (W.Workspace _ _ s) _ _) _ _ _) -> do
return $ W.integrate' s
getHorizontallyOrderedScreens ::
W.StackSet wid l a ScreenId ScreenDetail ->
[(Bool, W.Screen wid l a ScreenId ScreenDetail)]
-- ^ Returns a list of screens ordered from leftmost to rightmost.
getHorizontallyOrderedScreens windowSet =
flip sortBy screens $ \sc1 sc2 ->
let (SD (Rectangle x1 _ _ _)) = W.screenDetail (snd sc1)
(SD (Rectangle x2 _ _ _)) = W.screenDetail (snd sc2)
in x1 `compare` x2
where
screens = (True, W.current windowSet) : map (False,) (W.visible windowSet)
shiftToWorkspace :: WorkspaceId -> X ()
shiftToWorkspace t = do
addHiddenWorkspace t
windows . W.shift $ t
accompaningWorkspace :: WorkspaceId -> WorkspaceId
accompaningWorkspace [s] = return $
if isUpper s
then toLower s
else toUpper s
accompaningWorkspace s = s
swapWorkspace :: WorkspaceId -> X ()
swapWorkspace toWorkspace = do
addHiddenWorkspace toWorkspace
windows $ \ss -> do
let fromWorkspace = W.tag $ W.workspace $ W.current ss in
W.StackSet (swapSc fromWorkspace toWorkspace $ W.current ss)
(map (swapSc fromWorkspace toWorkspace) $ W.visible ss)
(map (swapWs fromWorkspace toWorkspace) $ W.hidden ss)
(W.floating ss)
where
swapSc fromWorkspace toWorkspace (W.Screen ws a b) =
W.Screen (swapWs fromWorkspace toWorkspace ws) a b
swapWs fromWorkspace toWorkspace ws@(W.Workspace t' l s)
| t' == fromWorkspace = W.Workspace toWorkspace l s
| t' == toWorkspace = W.Workspace fromWorkspace l s
| otherwise = ws
adjacentWorkspaceNotVisible :: Selector -> WorkspaceId -> X WorkspaceId
adjacentWorkspaceNotVisible (Selector selector) from =
withWindowSet $ \ss ->
let tags = sort $
W.tag . snd <$> filter (\x -> fst x /= Visible) (
getPopulatedWorkspaces ss)
in
return $ fromMaybe from $ selector (==from) tags
adjacentWorkspace :: Selector -> WorkspaceId -> X WorkspaceId
adjacentWorkspace (Selector selector) from =
withWindowSet $ \ss ->
let tags = sort $ W.tag . snd <$> getPopulatedWorkspaces ss
in
return $ fromMaybe from $ selector (==from) tags
viewAdjacent :: Selector -> X ()
viewAdjacent sel =
gotoWorkspace =<< (adjacentWorkspaceNotVisible sel =<< getCurrentWorkspace)
adjacentScreen :: Selector -> X WorkspaceId
adjacentScreen (Selector f) = do
(screens, current) <-
withWindowSet $ return . (getHorizontallyOrderedScreens &&& W.current)
return $ W.tag $ W.workspace $ maybe current snd (f fst screens)
withScreen :: (WorkspaceId -> WindowSet -> WindowSet) -> Int -> X ()
withScreen fn n = do
windows $ \windowSet ->
case map snd (getHorizontallyOrderedScreens windowSet) !! n of
Nothing -> windowSet
Just screen -> fn (W.tag $ W.workspace screen) windowSet
workspaceWithWindow :: Window -> X (Maybe WorkspaceId)
workspaceWithWindow wid = withWindowSet $ \(W.StackSet c v h _) ->
return $
W.tag <$>
find (\(W.Workspace _ _ stack) -> wid `elem` W.integrate' stack)
(map W.workspace (c : v) ++ h)
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