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|
{-# LANGUAGE DeriveDataTypeable #-}
-----------------------------------------------------------------------------
-- |
-- Module : XMonad.Hooks.WorkspaceHistory
-- Copyright : (c) 2013 Dmitri Iouchtchenko
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : Dmitri Iouchtchenko <johnnyspoon@gmail.com>
-- Stability : unstable
-- Portability : unportable
--
-- Keeps track of workspace viewing order.
--
-----------------------------------------------------------------------------
module XMonad.Hooks.WorkspaceHistory
( -- * Usage
-- $usage
-- * Hooking
workspaceHistoryHook
-- * Querying
, workspaceHistory
) where
import XMonad
import XMonad.StackSet (currentTag)
import qualified XMonad.Util.ExtensibleState as XS
-- $usage
-- To record the order in which you view workspaces, you can use this
-- module with the following in your @~\/.xmonad\/xmonad.hs@:
--
-- > import XMonad.Hooks.WorkspaceHistory (workspaceHistoryHook)
--
-- Then add the hook to your 'logHook':
--
-- > main = xmonad $ def
-- > { ...
-- > , logHook = ... >> workspaceHistoryHook >> ...
-- > , ...
-- > }
--
-- To make use of the collected data, a query function is provided.
data WorkspaceHistory =
WorkspaceHistory { history :: [WorkspaceId] -- ^ Workspaces in reverse-chronological order.
}
deriving (Typeable, Read, Show)
instance ExtensionClass WorkspaceHistory where
initialValue = WorkspaceHistory []
extensionType = PersistentExtension
-- | A 'logHook' that keeps track of the order in which workspaces have
-- been viewed.
workspaceHistoryHook :: X ()
workspaceHistoryHook = gets (currentTag . windowset) >>= (XS.modify . makeFirst)
-- | A list of workspace tags in the order they have been viewed, with the
-- most recent first. No duplicates are present, but not all workspaces are
-- guaranteed to appear, and there may be workspaces that no longer exist.
workspaceHistory :: X [WorkspaceId]
workspaceHistory = XS.gets history
-- | Cons the 'WorkspaceId' onto the 'WorkspaceHistory' if it is not
-- already there, or move it to the front if it is.
makeFirst :: WorkspaceId -> WorkspaceHistory -> WorkspaceHistory
makeFirst w v = let (xs, ys) = break (w ==) $ history v
in v { history = w : (xs ++ drop 1 ys) }
|
