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{-# LANGUAGE LambdaCase #-}
module Main where
import Control.Monad (forM_, when)
import Data.Text.Lazy (Text)
import qualified Data.Text.Lazy as T
import qualified Data.Text.Lazy.Builder as B
import qualified Data.Text.Lazy.IO as T
import Options.Applicative
import System.Exit
import Pattern
import Parser
import Pretty
import SourceFile
apply :: Pattern -> SourceFile -> SourceFile
apply pat (SourceFile chunks) =
SourceFile $ flip map chunks $ \case CSkip s -> CSkip s
COcc occ -> COcc (apply' pat occ)
apply' :: Pattern -> Occurrence -> Occurrence
apply' (Pattern name items) origocc@(Occurrence name' args)
| name == name' = Occurrence name' (travOrigsArgs items args)
| otherwise = origocc
travOrigsArgs :: [Origin] -> [(Text, Text)] -> [(Text, Text)]
travOrigsArgs [] args = args
travOrigsArgs (OCopy : items) (arg:args) = arg : travOrigsArgs items args
travOrigsArgs (ONew name : items) args = (T.pack " ", name) : travOrigsArgs items args
travOrigsArgs _ [] = []
data Options = Options { optPattern :: Pattern
, optFiles :: [FilePath]
, optInPlace :: Bool }
deriving (Show)
parseOptions :: Parser Options
parseOptions = Options <$> option (eitherReader parsePattern) (short 'p' <> help "The pattern to apply. *-prefixed type variables are added." <> metavar "PAT")
<*> some (argument str (metavar "FILES..."))
<*> switch (short 'i' <> help "Apply changes in-place. WARNING: This mutates files! \
\(This also allows multiple files to be given on the command line.)")
main :: IO ()
main = do
opts <- execParser $
info (parseOptions <**> helper)
(fullDesc
<> progDesc "Refactor type variables of a data type in Haskell"
<> header "refactor-type-variables - Refactoring Haskell data type parameters")
when (not (optInPlace opts) && length (optFiles opts) /= 1) $
die "Multiple input files can only be given in conjunction with -i"
forM_ (optFiles opts) $ \fname -> do
source <- readFile fname
parsed <- case parseSourceFile fname source (optPattern opts) of
Left err -> die ("Could not parse '" ++ fname ++ "': " ++ show err)
Right res -> return res
let result = apply (optPattern opts) parsed
resultText = B.toLazyText (sourceFileToBuilder False result)
if optInPlace opts
then do T.writeFile fname resultText
putStrLn ("Processed '" ++ fname ++ "'")
else T.putStrLn (pretty (apply (optPattern opts) parsed))
-- print parsed
-- T.putStrLn (pretty parsed)
-- putStrLn (replicate 80 '-')
-- T.putStrLn (pretty (apply (optPattern opts) parsed))
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