content: {-# LANGUAGE CPP #-}
  {-# LANGUAGE DataKinds #-}
  {-# LANGUAGE LambdaCase #-}
  {-# LANGUAGE QuasiQuotes #-}
  {-# LANGUAGE RecordWildCards #-}
  {-# LANGUAGE TemplateHaskell #-}
  
  module Main (main) where
  
  import Control.Concurrent (MVar, newMVar, withMVar)
  import Control.Exception (throwIO)
  import Control.Monad
  import Data.Bool (bool)
  import Data.List (intercalate, sort)
  import Data.List.NonEmpty (NonEmpty)
  import Data.Map.Strict qualified as Map
  import Data.Maybe (fromMaybe, mapMaybe, maybeToList)
  import Data.Set qualified as Set
  import Data.Text.IO.Utf8 qualified as T.Utf8
  import Data.Version (showVersion)
  import Distribution.ModuleName (ModuleName)
  import Distribution.Types.PackageName (PackageName)
  import Language.Haskell.TH.Env (envQ)
  import Options.Applicative
  import Ormolu
  import Ormolu.Diff.Text (diffText, printTextDiff)
  import Ormolu.Fixity
  import Ormolu.Parser (manualExts)
  import Ormolu.Terminal
  import Ormolu.Utils (showOutputable)
  import Ormolu.Utils.Fixity
  import Paths_ormolu (version)
  import System.Directory
  import System.Exit (ExitCode (..), exitWith)
  import System.FilePath qualified as FP
  import System.IO (hPutStrLn, stderr)
  import UnliftIO.Async (pooledMapConcurrently)
  
  -- | Entry point of the program.
  main :: IO ()
  main = do
    Opts {..} <- execParser optsParserInfo
    -- We use this to guard writes to stdout in order to avoid
    -- garbled output from concurrent formatting processes.
    outputLock <- newMVar ()
    let formatOne' =
          formatOne
            optConfigFileOpts
            optMode
            optSourceType
            optConfig
            outputLock
    exitCode <- case optInputFiles of
      [] -> formatOne' Nothing
      ["-"] -> formatOne' Nothing
      [x] -> formatOne' (Just x)
      xs -> do
        let selectFailure = \case
              ExitSuccess -> Nothing
              ExitFailure n -> Just n
        errorCodes <-
          mapMaybe selectFailure
            <$> pooledMapConcurrently (formatOne' . Just) (sort xs)
        return $
          if null errorCodes
            then ExitSuccess
            else
              ExitFailure $
                if all (== 100) errorCodes
                  then 100
                  else 102
    exitWith exitCode
  
  -- | Format a single input.
  formatOne ::
    -- | How to use .cabal files
    ConfigFileOpts ->
    -- | Mode of operation
    Mode ->
    -- | The 'SourceType' requested by the user
    Maybe SourceType ->
    -- | Configuration
    Config RegionIndices ->
    -- | Lock for writing to output handles
    MVar () ->
    -- | File to format or stdin as 'Nothing'
    Maybe FilePath ->
    IO ExitCode
  formatOne ConfigFileOpts {..} mode reqSourceType rawConfig outputLock mpath =
    withPrettyOrmoluExceptions (cfgColorMode rawConfig) $ do
      let getCabalInfoForSourceFile' sourceFile = do
            cabalSearchResult <- getCabalInfoForSourceFile sourceFile
            let debugEnabled = cfgDebug rawConfig
            case cabalSearchResult of
              CabalNotFound -> do
                when debugEnabled $
                  withMVar outputLock $ \_ ->
                    hPutStrLn stderr $
                      "Could not find a .cabal file for " <> sourceFile
                return Nothing
              CabalDidNotMention cabalInfo -> do
                when debugEnabled $ do
                  relativeCabalFile <-
                    makeRelativeToCurrentDirectory (ciCabalFilePath cabalInfo)
                  withMVar outputLock $ \_ ->
                    hPutStrLn stderr $
                      "Found .cabal file "
                        <> relativeCabalFile
                        <> ", but it did not mention "
                        <> sourceFile
                return (Just cabalInfo)
              CabalFound cabalInfo -> return (Just cabalInfo)
          getDotOrmoluForSourceFile' sourceFile = do
            if optDoNotUseDotOrmolu
              then return Nothing
              else Just <$> getDotOrmoluForSourceFile sourceFile
      case FP.normalise <$> mpath of
        -- input source = STDIN
        Nothing -> do
          mcabalInfo <- case (optStdinInputFile, optDoNotUseCabal) of
            (_, True) -> return Nothing
            (Nothing, False) -> throwIO OrmoluMissingStdinInputFile
            (Just inputFile, False) -> getCabalInfoForSourceFile' inputFile
          mdotOrmolu <- case optStdinInputFile of
            Nothing -> return Nothing
            Just inputFile -> getDotOrmoluForSourceFile' inputFile
          config <- patchConfig Nothing mcabalInfo mdotOrmolu
          case mode of
            Stdout -> do
              output <- ormoluStdin config
              withMVar outputLock $ \_ ->
                T.Utf8.putStr output
              return ExitSuccess
            InPlace -> do
              hPutStrLn
                stderr
                "In place editing is not supported when input comes from stdin."
              -- 101 is different from all the other exit codes we already use.
              return (ExitFailure 101)
            Check -> do
              -- ormoluStdin is not used because we need the originalInput
              originalInput <- T.Utf8.getContents
              let stdinRepr = "<stdin>"
              formattedInput <-
                ormolu config stdinRepr originalInput
              handleDiff originalInput formattedInput stdinRepr
        -- input source = a file
        Just inputFile -> do
          mcabalInfo <-
            if optDoNotUseCabal
              then return Nothing
              else getCabalInfoForSourceFile' inputFile
          mdotOrmolu <- getDotOrmoluForSourceFile' inputFile
          config <-
            patchConfig
              (Just (detectSourceType inputFile))
              mcabalInfo
              mdotOrmolu
          case mode of
            Stdout -> do
              output <- ormoluFile config inputFile
              withMVar outputLock $ \_ ->
                T.Utf8.putStr output
              return ExitSuccess
            InPlace -> do
              -- ormoluFile is not used because we need originalInput
              originalInput <- T.Utf8.readFile inputFile
              formattedInput <-
                ormolu config inputFile originalInput
              when (formattedInput /= originalInput) $
                T.Utf8.writeFile inputFile formattedInput
              return ExitSuccess
            Check -> do
              -- ormoluFile is not used because we need originalInput
              originalInput <- T.Utf8.readFile inputFile
              formattedInput <-
                ormolu config inputFile originalInput
              handleDiff originalInput formattedInput inputFile
    where
      patchConfig mdetectedSourceType mcabalInfo mdotOrmolu = do
        let sourceType =
              fromMaybe
                ModuleSource
                (reqSourceType <|> mdetectedSourceType)
        return $
          refineConfig
            sourceType
            mcabalInfo
            (Just (cfgFixityOverrides rawConfig))
            (Just (cfgModuleReexports rawConfig))
            ( rawConfig
                { cfgFixityOverrides = maybe defaultFixityOverrides fst mdotOrmolu,
                  cfgModuleReexports = maybe defaultModuleReexports snd mdotOrmolu
                }
            )
      handleDiff originalInput formattedInput fileRepr =
        case diffText originalInput formattedInput fileRepr of
          Nothing -> return ExitSuccess
          Just diff -> do
            runTerm (printTextDiff diff) (cfgColorMode rawConfig) stderr
            -- 100 is different to all the other exit code that are emitted
            -- either from an 'OrmoluException' or from 'error' and
            -- 'notImplemented'.
            return (ExitFailure 100)
  
  ----------------------------------------------------------------------------
  -- Command line options parsing
  
  -- | All command line options.
  data Opts = Opts
    { -- | Mode of operation
      optMode :: !Mode,
      -- | Ormolu 'Config'
      optConfig :: !(Config RegionIndices),
      -- | Options related to info extracted from files
      optConfigFileOpts :: ConfigFileOpts,
      -- | Source type option, where 'Nothing' means autodetection
      optSourceType :: !(Maybe SourceType),
      -- | Haskell source files to format or stdin (when the list is empty)
      optInputFiles :: ![FilePath]
    }
  
  -- | Mode of operation.
  data Mode
    = -- | Output formatted source code to stdout
      Stdout
    | -- | Overwrite original file
      InPlace
    | -- | Exit with non-zero status code if
      -- source is not already formatted
      Check
    deriving (Eq, Show)
  
  -- | Options related to configuration stored in the file system.
  data ConfigFileOpts = ConfigFileOpts
    { -- | DO NOT extract default-extensions and dependencies from .cabal files
      optDoNotUseCabal :: Bool,
      -- | DO NOT look for @.ormolu@ files
      optDoNotUseDotOrmolu :: Bool,
      -- | Optional path to a file which will be used to find a .cabal file
      -- when using input from stdin
      optStdinInputFile :: Maybe FilePath
    }
    deriving (Show)
  
  optsParserInfo :: ParserInfo Opts
  optsParserInfo =
    info (helper <*> ver <*> exts <*> optsParser) . mconcat $
      [fullDesc]
    where
      ver :: Parser (a -> a)
      ver =
        infoOption verStr . mconcat $
          [ long "version",
            short 'v',
            help "Print version of the program"
          ]
      verStr =
        intercalate
          "\n"
          [ unwords $
              ["ormolu", showVersion version]
                <> maybeToList $$(envQ @String "ORMOLU_REV"),
            "using ghc-lib-parser " ++ VERSION_ghc_lib_parser
          ]
      exts :: Parser (a -> a)
      exts =
        infoOption displayExts . mconcat $
          [ long "manual-exts",
            help "Display extensions that need to be enabled manually"
          ]
      displayExts = unlines $ sort (showOutputable <$> manualExts)
  
  optsParser :: Parser Opts
  optsParser =
    Opts
      <$> ( (fmap (bool Stdout InPlace) . switch . mconcat)
              [ short 'i',
                help "A shortcut for --mode inplace"
              ]
              <|> (option parseMode . mconcat)
                [ long "mode",
                  short 'm',
                  metavar "MODE",
                  value Stdout,
                  help "Mode of operation: 'stdout' (the default), 'inplace', or 'check'"
                ]
          )
      <*> configParser
      <*> configFileOptsParser
      <*> sourceTypeParser
      <*> (many . strArgument . mconcat)
        [ metavar "FILE",
          help "Haskell source files to format or stdin (the default)"
        ]
  
  configFileOptsParser :: Parser ConfigFileOpts
  configFileOptsParser =
    ConfigFileOpts
      <$> (switch . mconcat)
        [ long "no-cabal",
          help "Do not extract default-extensions and dependencies from .cabal files"
        ]
      <*> (switch . mconcat)
        [ long "no-dot-ormolu",
          help "Do not look for .ormolu files"
        ]
      <*> (optional . strOption . mconcat)
        [ long "stdin-input-file",
          help "Path which will be used to find the .cabal file when using input from stdin"
        ]
  
  configParser :: Parser (Config RegionIndices)
  configParser =
    Config
      <$> (fmap (fmap DynOption) . many . strOption . mconcat)
        [ long "ghc-opt",
          short 'o',
          metavar "OPT",
          help "GHC options to enable (e.g. language extensions)"
        ]
      <*> ( fmap (FixityOverrides . Map.fromList . mconcat)
              . many
              . option parseFixityDeclaration
              . mconcat
          )
        [ long "fixity",
          short 'f',
          metavar "FIXITY",
          help "Fixity declaration to use (an override)"
        ]
      <*> ( fmap (ModuleReexports . Map.fromListWith (<>) . mconcat . pure)
              . many
              . option parseModuleReexportDeclaration
              . mconcat
          )
        [ long "reexport",
          short 'r',
          metavar "REEXPORT",
          help "Module re-export that Ormolu should know about"
        ]
      <*> (fmap Set.fromList . many . strOption . mconcat)
        [ long "package",
          short 'p',
          metavar "PACKAGE",
          help "Explicitly specified dependency (for operator fixity/precedence only)"
        ]
      <*> (switch . mconcat)
        [ long "unsafe",
          short 'u',
          help "Do formatting faster but without automatic detection of defects"
        ]
      <*> (switch . mconcat)
        [ long "debug",
          short 'd',
          help "Output information useful for debugging"
        ]
      <*> (switch . mconcat)
        [ long "check-idempotence",
          short 'c',
          help "Fail if formatting is not idempotent"
        ]
      -- We cannot parse the source type here, because we might need to do
      -- autodection based on the input file extension (not available here)
      -- before storing the resolved value in the config struct.
      <*> pure ModuleSource
      <*> (option parseColorMode . mconcat)
        [ long "color",
          metavar "WHEN",
          value Auto,
          help "Colorize the output; WHEN can be 'never', 'always', or 'auto' (the default)"
        ]
      <*> ( RegionIndices
              <$> (optional . option auto . mconcat)
                [ long "start-line",
                  metavar "START",
                  help "Start line of the region to format (starts from 1)"
                ]
              <*> (optional . option auto . mconcat)
                [ long "end-line",
                  metavar "END",
                  help "End line of the region to format (inclusive)"
                ]
          )
  
  sourceTypeParser :: Parser (Maybe SourceType)
  sourceTypeParser =
    (option parseSourceType . mconcat)
      [ long "source-type",
        short 't',
        metavar "TYPE",
        value Nothing,
        help "Set the type of source; TYPE can be 'module', 'sig', or 'auto' (the default)"
      ]
  
  ----------------------------------------------------------------------------
  -- Helpers
  
  -- | Parse 'Mode'.
  parseMode :: ReadM Mode
  parseMode = eitherReader $ \case
    "stdout" -> Right Stdout
    "inplace" -> Right InPlace
    "check" -> Right Check
    s -> Left $ "unknown mode: " ++ s
  
  -- | Parse a fixity declaration.
  parseFixityDeclaration :: ReadM [(OpName, FixityInfo)]
  parseFixityDeclaration = eitherReader parseFixityDeclarationStr
  
  -- | Parse a module reexport declaration.
  parseModuleReexportDeclaration ::
    ReadM (ModuleName, NonEmpty (Maybe PackageName, ModuleName))
  parseModuleReexportDeclaration = eitherReader parseModuleReexportDeclarationStr
  
  -- | Parse 'ColorMode'.
  parseColorMode :: ReadM ColorMode
  parseColorMode = eitherReader $ \case
    "never" -> Right Never
    "always" -> Right Always
    "auto" -> Right Auto
    s -> Left $ "unknown color mode: " ++ s
  
  -- | Parse the 'SourceType'. 'Nothing' means that autodetection based on
  -- file extension is requested.
  parseSourceType :: ReadM (Maybe SourceType)
  parseSourceType = eitherReader $ \case
    "module" -> Right (Just ModuleSource)
    "sig" -> Right (Just SignatureSource)
    "auto" -> Right Nothing
    s -> Left $ "unknown source type: " ++ s
  