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Diffstat (limited to 'XMonad/Util')
| -rw-r--r-- | XMonad/Util/Replace.hs | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/XMonad/Util/Replace.hs b/XMonad/Util/Replace.hs new file mode 100644 index 0000000..49f4011 --- /dev/null +++ b/XMonad/Util/Replace.hs @@ -0,0 +1,116 @@ +{-# LANGUAGE DeriveDataTypeable #-} +----------------------------------------------------------------------------- +-- | +-- Module : XMonad.Util.Replace +-- Copyright : (c) Jan Vornberger 2009 +-- License : BSD3-style (see LICENSE) +-- +-- Maintainer : Adam Vogt <vogt.adam@gmail.com> +-- Stability : unstable +-- Portability : unportable +-- +-- Implements a @--replace@ behavior outside of core. +-- +----------------------------------------------------------------------------- + +-- refer to core patches: +-- http://article.gmane.org/gmane.comp.lang.haskell.xmonad/8358 +module XMonad.Util.Replace + ( -- * Usage + -- $usage + replace + + -- * Notes + -- $shortcomings + + -- ** Implementing a @--replace@ flag + -- $getArgs + ) where + +import XMonad +import Data.Function +import Control.Monad + +-- $usage +-- You must run the 'replace' action before starting xmonad proper, this +-- results in xmonad replacing the currently running WM regardless of the +-- arguments it is run with: +-- +-- > import XMonad +-- > import XMonad.Util.Replace +-- > main = do +-- > replace +-- > xmonad $ defaultConfig { .... } +-- + +-- $shortcomings +-- This doesn't seem to work for replacing WMs that have been started +-- from within xmonad, such as with @'restart' "openbox" False@, but no other +-- WMs that implements --replace manage this either. 'replace' works for +-- replacing metacity when the full gnome-session is started at least. + +-- $getArgs +-- You can use 'System.Environment.getArgs' to watch for an explicit +-- @--replace@ flag: +-- +-- > import XMonad +-- > import XMonad.Util.Replace (replace) +-- > import Control.Monad (when) +-- > import System.Environment (getArgs) +-- > +-- > main = do +-- > args <- getArgs +-- > when ("--replace" `elem` args) replace +-- > xmonad $ defaultConfig { .... } +-- +-- +-- Note that your @~\/.xmonad/xmonad-$arch-$os@ binary is not run with the same +-- flags as the @xmonad@ binary that calls it. You may be able to work around +-- this by running your @~\/.xmonad/xmonad-$arch-$os@ binary directly, which is +-- otherwise not recommended. + +-- | @replace@ must be run before xmonad starts to signals to compliant window +-- managers that they must exit and let xmonad take over. +replace :: IO () +replace = do + dpy <- openDisplay "" + let dflt = defaultScreen dpy + + rootw <- rootWindow dpy dflt + + -- check for other WM + wmSnAtom <- internAtom dpy ("WM_S" ++ (show dflt)) False + currentWmSnOwner <- xGetSelectionOwner dpy wmSnAtom + when (currentWmSnOwner /= 0) $ do + putStrLn $ "Screen " ++ (show dflt) ++ " on display \"" + ++ (displayString dpy) ++ "\" already has a window manager." + + -- prepare to receive destroyNotify for old WM + selectInput dpy currentWmSnOwner structureNotifyMask + + -- create off-screen window + netWmSnOwner <- allocaSetWindowAttributes $ \attributes -> do + set_override_redirect attributes True + set_event_mask attributes propertyChangeMask + let screen = defaultScreenOfDisplay dpy + let visual = defaultVisualOfScreen screen + let attrmask = cWOverrideRedirect .|. cWEventMask + createWindow dpy rootw (-100) (-100) 1 1 0 copyFromParent copyFromParent visual attrmask attributes + + -- try to acquire wmSnAtom, this should signal the old WM to terminate + putStrLn $ "Replacing existing window manager..." + xSetSelectionOwner dpy wmSnAtom netWmSnOwner currentTime + + -- SKIPPED: check if we acquired the selection + -- SKIPPED: send client message indicating that we are now the WM + + -- wait for old WM to go away + putStr $ "Waiting for other window manager to terminate... " + fix $ \again -> do + evt <- allocaXEvent $ \event -> do + windowEvent dpy currentWmSnOwner structureNotifyMask event + get_EventType event + + when (evt /= destroyNotify) again + putStrLn $ "done" + closeDisplay dpy |