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module Main
    ( main
    ) where


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import           Control.Applicative               ((<$>))
import           Data.Maybe                        (listToMaybe)
import           System.Environment                (getArgs)


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import qualified StylishHaskell.Imports
import qualified StylishHaskell.LanguagePragmas
import           StylishHaskell.Parse
import           StylishHaskell.Stylish
import qualified StylishHaskell.TrailingWhitespace


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runStylish :: Maybe FilePath -> Stylish -> Lines -> Lines
runStylish mfp f ls = case parseModule mfp (unlines ls) of
    Left err      -> error err  -- TODO: maybe return original lines?
    Right module' -> f ls module'


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chainStylish :: Maybe FilePath -> [Stylish] -> Lines -> Lines
chainStylish mfp filters = foldr (.) id filters'
  where
    filters' :: [Lines -> Lines]
    filters' = map (runStylish mfp) filters


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main :: IO ()
main = do
    filePath <- listToMaybe <$> getArgs
    contents <- maybe getContents readFile filePath
    putStr $ unlines $ chainStylish filePath filters $ lines contents
  where
    filters =
        [ StylishHaskell.Imports.stylish
        , StylishHaskell.LanguagePragmas.stylish
        -- , StylishHaskell.Tabs.stylish
        , StylishHaskell.TrailingWhitespace.stylish
        ]