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f732082fdc
Typeable has been automatically derived for every type since GHC 7.10, so remove these obsolete derivations. This also allows us to get rid of the `DeriveDataTypeable` pragma quite naturally. Related: https://github.com/xmonad/xmonad/pull/299 (xmonad/xmonad@9e5b16ed8a) Related: bd5b969d9ba24236c0d5ef521c0397390dbc4b37 Fixes: https://github.com/xmonad/xmonad-contrib/issues/548
62 lines
1.9 KiB
Haskell
62 lines
1.9 KiB
Haskell
-----------------------------------------------------------------------------
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-- |
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-- Module : XMonad.Util.SessionStart
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-- Copyright : (c) Markus Ongyerth 2017
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-- License : BSD3-style (see LICENSE)
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--
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-- Maintainer : markus@ongy.net
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-- Stability : unstable
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-- Portability : not portable
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--
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-- A module for detectiong session startup. Useful to start
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-- status bars, compositors and session initialization.
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-- This is a more general approach than spawnOnce and allows spawnOn etc.
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-----------------------------------------------------------------------------
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module XMonad.Util.SessionStart
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( doOnce
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, isSessionStart
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, setSessionStarted
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)
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where
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import XMonad.Prelude (when)
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import XMonad
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import qualified XMonad.Util.ExtensibleState as XS
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-- ---------------------------------------------------------------------
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-- $usage
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--
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-- Add 'setSessionStarted' at the end of the 'startupHook' to set the
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-- flag.
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--
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-- To do something only when the session is started up, use
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-- 'isSessionStart' to query or wrap it in 'doOnce' to only do it when
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-- the flag isn't set.
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-- ---------------------------------------------------------------------
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newtype SessionStart = SessionStart { unSessionStart :: Bool }
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deriving (Read, Show)
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instance ExtensionClass SessionStart where
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initialValue = SessionStart True
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extensionType = PersistentExtension
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-- | Use this to only do a part of your hook on session start
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doOnce :: X () -> X ()
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doOnce act = do
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startup <- isSessionStart
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when startup act
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-- | Query if the current startup is the session start
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isSessionStart :: X Bool
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isSessionStart = unSessionStart <$> XS.get
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-- This should become a noop/be deprecated when merged into master, and
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-- the flag should be set when the state file is loaded.
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-- | This currently has to be added to the end of the startup hook to
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-- set the flag.
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setSessionStarted :: X ()
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setSessionStarted = XS.put $ SessionStart False
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