new XMonad.Hooks.ManageHelpers module

darcs-hash:20071211183040-462cf-f8e47e21202ddcc60bde210469693fe70d08c337.gz

1 files changed, 86 insertions, 0 deletions

diff --git a/XMonad/Hooks/ManageHelpers.hs b/XMonad/Hooks/ManageHelpers.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module       : XMonad.Hooks.ManageHelpers
+-- Copyright    : (c) Lukas Mai
+-- License      : BSD
+--
+-- Maintainer   : Lukas Mai <l.mai@web.de>
+-- Stability    : unstable
+-- Portability  : unportable
+--
+-- This module provides helper functions to be used in @manageHook@. Here's how you
+-- might use this:
+--
+-- > import XMonad.Hooks.ManageHelpers
+-- > main =
+-- >     xmonad defaultConfig{
+-- >         ...
+-- >         manageHook = composeOne [
+-- >             isKDETrayWindow -?> doIgnore,
+-- >             transience,
+-- >             resource =? "stalonetray" -?> doIgnore
+-- >         ],
+-- >         ...
+-- >     }
+
+module XMonad.Hooks.ManageHelpers (
+    composeOne,
+    (-?>),
+    isKDETrayWindow,
+    transience,
+    transience'
+) where
+
+import XMonad
+import qualified XMonad.StackSet as W
+
+import Data.Maybe
+import Data.Monoid
+
+-- | An alternative 'ManageHook' composer. Unlike 'composeAll' it stops as soon as
+-- a candidate returns a 'Just' value, effectively running only the first match
+-- (whereas 'composeAll' continues and executes all matching rules).
+composeOne :: [Query (Maybe (Endo WindowSet))] -> ManageHook
+composeOne = foldr try idHook
+    where
+    try q z = do
+        x <- q
+        case x of
+            Just h -> return h
+            Nothing -> z
+
+infixr 0 -?>
+-- | A helper operator for use in 'composeOne'. It takes a condition and an action;
+-- if the condition fails, it returns 'Nothing' from the 'Query' so 'composeOne' will
+-- go on and try the next rule.
+(-?>) :: Query Bool -> Query (Endo WindowSet) -> Query (Maybe (Endo WindowSet))
+p -?> f = do
+    x <- p
+    if x then fmap Just f else return Nothing
+
+-- | A predicate to check whether a window is a KDE system tray icon.
+isKDETrayWindow :: Query Bool
+isKDETrayWindow = ask >>= \w -> liftX $ do
+    dpy <- asks display
+    kde_tray <- getAtom "_KDE_NET_WM_SYSTEM_TRAY_WINDOW_FOR"
+    r <- io $ getWindowProperty32 dpy kde_tray w
+    return $ case r of
+        Just [_] -> True
+        _ -> False
+
+-- | A special rule that moves transient windows to the workspace of their
+-- associated primary windows.
+transience :: Query (Maybe (Endo WindowSet))
+transience = do
+    w <- ask
+    d <- (liftX . asks) display
+    x <- liftIO $ getTransientForHint d w
+    case x of
+        Nothing -> return Nothing
+        Just w' -> do
+            return . Just . Endo $ \s ->
+                maybe s (`W.shift` s) (W.findTag w' s)
+
+-- | Like 'transience' but with a type that can be used in 'composeAll'.
+transience' :: ManageHook
+transience' = fmap (fromMaybe mempty) transience