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|
{-# LANGUAGE CPP #-}
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Date
-- Copyright : (c) Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- A date plugin for Xmobar
--
-- Usage example: in template put
--
-- > Run Date "%a %b %_d %Y <fc=#ee9a00> %H:%M:%S</fc>" "Mydate" 10
--
-----------------------------------------------------------------------------
module Xmobar.Plugins.Date (Date(..), date) where
import Xmobar.Run.Exec
#if ! MIN_VERSION_time(1,5,0)
import System.Locale
#endif
import Data.IORef
import Data.Time
import Control.Concurrent.Async (concurrently_)
data Date = Date String String Int
deriving (Read, Show)
instance Exec Date where
alias (Date _ a _) = a
rate (Date _ _ r) = r
start (Date f _ r) cb =
-- refresh time zone once a minute to avoid wasting CPU cycles
withRefreshingZone 600 $ \zone ->
doEveryTenthSeconds r $ date zone f >>= cb
date :: IORef TimeZone -> String -> IO String
date zoneRef format = do
zone <- readIORef zoneRef
fmap (formatTime defaultTimeLocale format . utcToZonedTime zone) getCurrentTime
withRefreshingZone :: Int -> (IORef TimeZone -> IO ()) -> IO ()
withRefreshingZone r action = do
zone <- newIORef =<< getCurrentTimeZone
let refresh = atomicWriteIORef zone =<< getCurrentTimeZone
concurrently_ (doEveryTenthSeconds r refresh) (action zone)
|
