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{-# LANGUAGE OverloadedStrings, DeriveGeneric #-}
-- https://www.schoolofhaskell.com/school/starting-with-haskell/libraries-and-frameworks/text-manipulation/json
module GMPDP where
import Data.Aeson
import qualified Data.ByteString.Lazy as B
import GHC.Generics
import Xmobar
import Control.Monad (when, guard)
import Control.Concurrent.STM
import System.INotify (Event(..), EventVariety(..), initINotify, addWatch)
import qualified Data.ByteString.Char8 as BS (ByteString, pack)
-- | Type of each JSON entry in record syntax.
data Song =
Song { title :: !String
, artist :: !String
, album :: !String
} deriving (Eq,Show,Generic)
data PlayTime =
PlayTime { current :: !Int
, total :: !Int
} deriving (Eq,Show,Generic)
data GMPDPStatus =
GMPDPStatus { song :: Song
, time :: PlayTime
} deriving (Eq,Show,Generic)
-- Instances to convert our type to/from JSON.
instance FromJSON Song
instance FromJSON PlayTime
instance FromJSON GMPDPStatus
-- | Location of the local copy, in case you have it,
-- of the JSON file.
jsonFile :: FilePath
jsonFile = "/home/jao/.config/Google Play Music Desktop Player/json_store/playback.json"
getJSON :: IO B.ByteString
getJSON = B.readFile jsonFile
getGMPDPStatus :: IO (Maybe GMPDPStatus)
getGMPDPStatus = do
s <- (eitherDecode <$> getJSON) :: IO (Either String GMPDPStatus)
case s of
Left _ -> return Nothing
Right r -> return $ Just r
newtype GMPDP = GMPDP String deriving (Show,Read,Generic)
handleNotification :: TVar (Maybe GMPDPStatus) -> Event -> IO ()
handleNotification v _ =
getGMPDPStatus >>= \s -> atomically $ writeTVar v s
formatStatus Nothing = ""
formatStatus (Just s) =
fmtt (current $ time s) ++ "/" ++ fmtt (total $ time s) ++
" " ++ title (song s) ++ " <fc=sienna4>" ++ album (song s) ++ "</fc>" ++
" " ++ artist (song s)
where fmtt ms = let s = ms `div` 1000
sr x = if x < 10 then "0" ++ show x else show x
in sr (s `div` 60) ++ ":" ++ sr (s `mod` 60)
changeLoop :: Eq a => STM a -> (a -> IO ()) -> IO ()
changeLoop s f = atomically s >>= go
where
go old = do
f old
go =<< atomically (do
new <- s
guard (new /= old)
return new)
instance Exec GMPDP where
alias (GMPDP a) = a
start (GMPDP _) cb = do
i <- initINotify
s <- getGMPDPStatus
v <- newTVarIO s
addWatch i [CloseWrite] (BS.pack jsonFile) (handleNotification v)
changeLoop (readTVar v) $ \s -> cb (formatStatus s)
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