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|
{-# LANGUAGE DoAndIfThenElse #-}
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.DateZone
-- Copyright : (c) Martin Perner
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Martin Perner <martin@perner.cc>
-- Stability : unstable
-- Portability : unportable
--
-- A date plugin with localization and location support for Xmobar
--
-- Based on Plugins.Date
--
-- Usage example: in template put
--
-- > Run DateZone "%a %H:%M:%S" "de_DE.UTF-8" "UTC" "utcDate" 10
--
-----------------------------------------------------------------------------
module Plugins.DateZone (DateZone(..)) where
import Plugins
import Localize
import Control.Concurrent.STM
import Data.Time.LocalTime
import Data.Time.Format
import Data.Time.LocalTime.TimeZone.Olson
import Data.Time.LocalTime.TimeZone.Series
import System.IO.Unsafe
import System.Locale (TimeLocale)
import System.Time
{-# NOINLINE localeLock #-}
-- ensures that only one plugin instance sets the locale
localeLock :: TMVar Bool
localeLock = unsafePerformIO (newTMVarIO False)
data DateZone = DateZone String String String String Int
deriving (Read, Show)
instance Exec DateZone where
alias (DateZone _ _ _ a _) = a
start (DateZone f l z _ r) cb = do
lock <- atomically $ takeTMVar localeLock
setupTimeLocale l
locale <- getTimeLocale
atomically $ putTMVar localeLock lock
if z /= "" then do
timeZone <- getTimeZoneSeriesFromOlsonFile ("/usr/share/zoneinfo/" ++ z)
go (dateZone f locale timeZone)
else
go (date f locale)
where go func = func >>= cb >> tenthSeconds r >> go func
date :: String -> TimeLocale -> IO String
date format loc = do
t <- toCalendarTime =<< getClockTime
return $ formatCalendarTime loc format t
dateZone :: String -> TimeLocale -> TimeZoneSeries -> IO String
dateZone format loc timeZone = do
zonedTime <- getZonedTime
return $ formatTime loc format $ utcToLocalTime' timeZone $ zonedTimeToUTC zonedTime
|
