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{-# LANGUAGE DeriveGeneric #-}
module F2Md.Config (getUserdata, FeedUserdata(..)) where
import F2Md.Utils
import Data.Maybe
import Data.Text (Text)
import Data.Time
import GHC.Generics
import qualified Data.HashMap.Strict as HM
import Data.Aeson
import qualified Data.ByteString.Lazy as BSL
data Config = Config
{ dbPath :: String
, maildir :: String
, feeds :: [Text]
} deriving (Generic, Show)
instance FromJSON Config
data FeedUserdata = FeedUserdata
{ url :: Text
, lastUpdated :: Maybe ZonedTime } deriving (Generic, Show)
getUserdata :: FilePath -> IO ([FeedUserdata], Maybe FilePath)
getUserdata file = do
config <- decode <$> BSL.readFile file
case config of
Nothing -> return ([], Nothing)
Just config' -> do
feedData <- getUserdata' config'
maildir' <- expandPath $ maildir config'
return (feedData, Just maildir')
getUserdata' :: Config -> IO [FeedUserdata]
getUserdata' (Config dbPath _ feeds) = do
decoded <- decode <$> (BSL.readFile =<< expandPath dbPath)
let decoded' = fromMaybe (HM.fromList []) decoded
return $
map (\url -> FeedUserdata url $ HM.lookup url decoded') feeds
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