MPRIS plugin

1 files changed, 129 insertions, 0 deletions

diff --git a/src/Plugins/Monitors/Mpris.hs b/src/Plugins/Monitors/Mpris.hs
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+++ b/src/Plugins/Monitors/Mpris.hs
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+{-# LANGUAGE OverloadedStrings #-}
+
+----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.Mpris
+-- Copyright   :  (c) Artem Tarasov
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Artem Tarasov <lomereiter@gmail.com>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+--   MPRIS song info
+--
+----------------------------------------------------------------------------
+
+module Plugins.Monitors.Mpris ( mprisConfig, runMPRIS1, runMPRIS2 ) where
+
+-- TODO: listen to signals
+
+import Plugins.Monitors.Common
+
+import Text.Printf (printf)
+import qualified DBus.Client.Simple as C
+import DBus.Types
+import DBus.Connection ( ConnectionError )
+import Data.Maybe ( fromJust )
+import Data.Int ( Int32, Int64 )
+import System.IO.Unsafe (unsafePerformIO)
+import qualified Data.Text as T
+
+import Control.Exception (try, evaluate)
+
+class MprisVersion a where
+    getProxy :: a -> C.Client -> String -> IO C.Proxy
+    getMetadataReply :: a -> C.Client -> String -> IO [Variant]
+    fieldsList :: a -> [String]
+
+data MprisVersion1 = MprisVersion1
+instance MprisVersion MprisVersion1 where
+    getProxy MprisVersion1 c p = do
+        let playerBusName = T.concat ["org.mpris.", T.pack p]
+        C.proxy c (C.busName_ playerBusName) "/Player"
+    getMetadataReply MprisVersion1 c p = do
+        player <- getProxy MprisVersion1 c p
+        C.call player "org.freedesktop.MediaPlayer" "GetMetadata" []
+    fieldsList MprisVersion1 = [ "album", "artist", "arturl", "time", "title", "tracknumber" ]
+
+data MprisVersion2 = MprisVersion2
+instance MprisVersion MprisVersion2 where
+    getProxy MprisVersion2 c p = do
+        let playerBusName = T.concat ["org.mpris.MediaPlayer2.", T.pack p]
+        C.proxy c (C.busName_ playerBusName) "/org/mpris/MediaPlayer2"
+    getMetadataReply MprisVersion2 c p = do
+        player <- getProxy MprisVersion2 c p
+        C.call player "org.freedesktop.DBus.Properties" 
+                      "Get" 
+                      (map (toVariant::String -> Variant) 
+                           ["org.mpris.MediaPlayer2.Player", "Metadata"]
+                      )
+    fieldsList MprisVersion2 = [ "xesam:album", "xesam:artist", "mpris:artUrl"
+                               , "mpris:length", "xesam:title", "xesam:trackNumber"
+                               ]
+
+mprisConfig :: IO MConfig
+mprisConfig = mkMConfig "<artist> - <title>"
+                [ "album", "artist", "arturl", "length" , "title", "tracknumber" 
+                ]
+
+dbusClient :: C.Client
+dbusClient = unsafePerformIO C.connectSession
+
+runMPRIS :: (MprisVersion a) => a -> String -> [String] -> Monitor String
+runMPRIS version playerName _ = do
+    metadata <- io $ getMetadata version dbusClient playerName
+    parseTemplate $ makeList version metadata
+
+runMPRIS1 :: String -> [String] -> Monitor String
+runMPRIS1 = runMPRIS MprisVersion1
+
+runMPRIS2 :: String -> [String] -> Monitor String
+runMPRIS2 = runMPRIS MprisVersion2
+
+---------------------------------------------------------------------------
+
+fromVar :: (IsVariant a) => Variant -> a
+fromVar = fromJust . fromVariant
+
+unpackMetadata :: [Variant] -> [(String, Variant)]
+unpackMetadata [] = []
+unpackMetadata xs = ((map (\(k, v) -> (fromVar k, fromVar v))) . unpack . head) xs where 
+                      unpack v = case variantType v of
+                            TypeDictionary _ _ -> dictionaryItems $ fromVar v
+                            TypeVariant -> unpack $ fromVar v
+                            TypeStructure _ -> unpack $ head $ structureItems $ fromVar v
+                            _ -> []
+
+getMetadata :: (MprisVersion a) => a -> C.Client -> String -> IO [(String, Variant)]
+getMetadata version client player = do
+    reply <- try (getMetadataReply version client player) ::
+                            IO (Either ConnectionError [Variant])
+    return $ case reply of 
+                  Right metadata -> unpackMetadata metadata; 
+                  Left _ -> []
+
+makeList :: (MprisVersion a) => a -> [(String, Variant)] -> [String]
+makeList version md = map getStr (fieldsList version) where 
+            formatTime n = (if hh == 0 then printf "%02d:%02d"
+                                       else printf "%d:%02d:%02d" hh) mm ss
+                           where hh = (n `div` 60) `div` 60
+                                 mm = (n `div` 60) `mod` 60
+                                 ss = n `mod` 60
+            getStr str = case lookup str md of
+                Nothing -> ""
+                Just v -> case variantType v of
+                            TypeString -> fromVar v
+                            TypeInt32 -> let num = fromVar v in
+                                          case str of
+                                           "time" -> formatTime num
+                                           "tracknumber" -> printf "%02d" num
+                                           "mpris:length" -> formatTime (num `div` 1000000)
+                                           "xesam:trackNumber" -> printf "%02d" num
+                                           _ -> (show::Int32 -> String) num
+                            TypeInt64 -> let num = fromVar v in
+                                          case str of
+                                           "mpris:length" -> formatTime (num `div` 1000000)
+                                           _ -> (show::Int64 -> String) num
+                            TypeArray TypeString -> fromVar $ head $ arrayItems $ fromVar v
+                            _ -> ""