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{-# LANGUAGE DeriveGeneric #-}
module F2Md.Config
( getUserdata
, FeedUserdata(..)
, updateLastUpdated
, updateLastUpdated'
) where
import Control.Monad
import Data.List
import F2Md.Utils
import F2Md.Types
import Data.Maybe
import Data.Text (Text)
import Data.Time
import GHC.Generics
import qualified Data.HashMap.Strict as HM
import Data.Aeson
data Config = Config
{ dbPath :: String
, maildir :: String
, feeds :: [Text]
} deriving (Generic, Show)
instance FromJSON Config
data FeedUserdata = FeedUserdata
{ fuUrl :: Text
, fuLastUpdated :: Maybe ZonedTime } deriving (Show)
getUserdata :: FilePath -> IO ([FeedUserdata], Maybe FilePath, Maybe FilePath)
getUserdata file = do
config <- decodeFileStrict file
case config of
Nothing -> return ([], Nothing, Nothing)
Just config' -> do
feedData <- getUserdata' config'
maildir' <- expandPath $ maildir config'
dbPath' <- expandPath $ dbPath config'
return (feedData, Just maildir', Just dbPath')
getUserdata' :: Config -> IO [FeedUserdata]
getUserdata' (Config dbPath _ feeds) = do
decoded <- getLastUpdatedMap dbPath
return $ map (\url -> FeedUserdata url $ HM.lookup url decoded) feeds
getLastUpdatedMap :: FilePath -> IO (HM.HashMap Text ZonedTime)
getLastUpdatedMap dbPath =
fromMaybe (HM.fromList []) <$> (decodeFileStrict =<< expandPath dbPath)
updateLastUpdated' :: FilePath -> FeedUserdata -> [Message] -> IO ()
updateLastUpdated' path feed msgs =
unless (null msgs) $ do
decoded <- getLastUpdatedMap path
encodeFile path $
HM.insert
(fuUrl feed)
(utcToZonedTime (zonedTimeZone $ mDate $ head msgs) . maximum $
(zonedTimeToUTC . mDate) <$> msgs)
decoded
updateLastUpdated :: FilePath -> [FeedUserdata] -> [[Message]] -> IO ()
updateLastUpdated path feeds feedMsgs = do
mapM_ (\(feed, msgs) -> updateLastUpdated' path feed msgs)
(zip feeds feedMsgs)
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