559 lines
21 KiB
Haskell
559 lines
21 KiB
Haskell
{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE MultiWayIf #-}
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{-# LANGUAGE NoImplicitPrelude #-}
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module Language.Haskell.Brittany.Main where
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import Control.Monad (zipWithM)
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import qualified Control.Monad.Trans.Except as ExceptT
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import Data.CZipWith
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import qualified Data.Either
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import qualified Data.List.Extra
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import qualified Data.Monoid
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import qualified Data.Text as Text
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import qualified Data.Text.IO as Text.IO
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import qualified Data.Text.Lazy as TextL
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import DataTreePrint
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import GHC (GenLocated(L))
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import qualified GHC
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import qualified GHC.Driver.Session as GHC
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import qualified GHC.LanguageExtensions.Type as GHC
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import qualified GHC.OldList as List
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import GHC.Utils.Outputable (Outputable(..), showSDocUnsafe)
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import Language.Haskell.Brittany.Internal
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import Language.Haskell.Brittany.Internal.Config.Config
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import Language.Haskell.Brittany.Internal.Config.Types
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import Language.Haskell.Brittany.Internal.Components.Obfuscation
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import Language.Haskell.Brittany.Internal.Prelude
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import Language.Haskell.Brittany.Internal.Types
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import Language.Haskell.Brittany.Internal.Utils
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import qualified Language.Haskell.GHC.ExactPrint as ExactPrint
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import Paths_brittany
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import qualified System.Directory as Directory
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import qualified System.Environment as Environment
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import qualified System.Exit
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import qualified System.FilePath.Posix as FilePath
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import qualified System.IO
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import qualified Text.ParserCombinators.ReadP as ReadP
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import qualified Text.ParserCombinators.ReadPrec as ReadPrec
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import qualified Text.PrettyPrint as PP
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import Text.Read (Read(..))
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import UI.Butcher.Monadic
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data WriteMode = Display | Inplace
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instance Read WriteMode where
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readPrec = val "display" Display <|> val "inplace" Inplace
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where val iden v = ReadPrec.lift $ ReadP.string iden >> return v
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instance Show WriteMode where
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show Display = "display"
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show Inplace = "inplace"
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main :: IO ()
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main = do
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progName <- Environment.getProgName
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args <- Environment.getArgs
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mainWith progName args
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testMain :: IO ()
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testMain = do
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h <- System.IO.openFile "local/sample-folder/err.txt" System.IO.WriteMode
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let cmdlineR =
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runCmdParser
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Nothing
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(InputArgs
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[ "--output-on-errors"
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, "--dump-ast-full"
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, "--omit-output-check"
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-- , "--dump-bridoc-alt"
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, "--dump-bridoc-floating"
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-- , "--dump-bridoc-par"
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-- , "--dump-bridoc-columns"
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, "--dump-bridoc-final"
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]
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)
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$ do
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reorderStart
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c <- cmdlineConfigParser
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reorderStop
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addCmdImpl c
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let cmdlineConfig = case _ppi_value cmdlineR of
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Left err -> error (show err)
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Right (Nothing) -> error "could not parse config"
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Right (Just r ) -> r
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configsToLoad <-
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maybeToList <$> (Directory.getCurrentDirectory >>= findLocalConfigPath)
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config <- runMaybeT (readConfigs cmdlineConfig configsToLoad)
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-- (readConfigsWithUserConfig cmdlineConfig configsToLoad)
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>>= \case
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Nothing -> System.Exit.exitWith (System.Exit.ExitFailure 53)
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Just x -> return x
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System.IO.hPutStrLn h $ showConfigYaml config
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e <- coreIO (System.IO.hPutStrLn h)
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config
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False
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False
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(Just "local/sample-folder/Test.hs")
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(Just "local/sample-folder/out.txt")
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case e of
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Left i -> print i
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Right Changes -> putStrLn "Changes"
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Right NoChanges -> putStrLn "NoChanges"
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mainWith :: String -> [String] -> IO ()
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mainWith progName args =
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Environment.withProgName progName
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. Environment.withArgs args
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$ mainFromCmdParser mainCmdParser
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helpDoc :: PP.Doc
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helpDoc = PP.vcat $ List.intersperse
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(PP.text "")
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[ parDocW
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[ "Reformats one or more haskell modules."
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, "Currently affects only the module head (imports/exports), type"
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, "signatures and function bindings;"
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, "everything else is left unmodified."
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, "Based on ghc-exactprint, thus (theoretically) supporting all"
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, "that ghc does."
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]
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, parDoc $ "Example invocations:"
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, PP.hang (PP.text "") 2 $ PP.vcat
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[ PP.text "brittany"
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, PP.nest 2 $ PP.text "read from stdin, output to stdout"
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]
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, PP.hang (PP.text "") 2 $ PP.vcat
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[ PP.text "brittany --indent=4 --write-mode=inplace *.hs"
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, PP.nest 2 $ PP.vcat
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[ PP.text "run on all modules in current directory (no backup!)"
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, PP.text "4 spaces indentation"
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]
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]
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, parDocW
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[ "This program is written carefully and contains safeguards to ensure"
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, "the output is syntactically valid and that no comments are removed."
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, "Nonetheless, this is a young project, and there will always be bugs,"
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, "and ensuring that the transformation never changes semantics of the"
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, "transformed source is currently not possible."
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, "Please do check the output and do not let brittany override your large"
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, "codebase without having backups."
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]
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, parDoc $ "There is NO WARRANTY, to the extent permitted by law."
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, parDocW
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[ "This program is free software released under the AGPLv3."
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, "For details use the --license flag."
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]
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, parDoc $ "See https://github.com/lspitzner/brittany"
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, parDoc
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$ "Please report bugs at"
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++ " https://github.com/lspitzner/brittany/issues"
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]
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licenseDoc :: PP.Doc
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licenseDoc = PP.vcat $ List.intersperse
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(PP.text "")
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[ parDoc $ "Copyright (C) 2016-2019 Lennart Spitzner"
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, parDoc $ "Copyright (C) 2019 PRODA LTD"
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, parDocW
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[ "This program is free software: you can redistribute it and/or modify"
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, "it under the terms of the GNU Affero General Public License,"
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, "version 3, as published by the Free Software Foundation."
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]
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, parDocW
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[ "This program is distributed in the hope that it will be useful,"
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, "but WITHOUT ANY WARRANTY; without even the implied warranty of"
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, "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the"
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, "GNU Affero General Public License for more details."
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]
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, parDocW
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[ "You should have received a copy of the GNU Affero General Public"
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, "License along with this program. If not, see"
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, "<http://www.gnu.org/licenses/>."
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]
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]
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mainCmdParser :: CmdParser Identity (IO ()) ()
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mainCmdParser = do
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helpDesc <- peekCmdDesc
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addCmdSynopsis "haskell source pretty printer"
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addCmdHelp $ helpDoc
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-- addCmd "debugArgs" $ do
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addHelpCommand helpDesc
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addCmd "license" $ addCmdImpl $ print $ licenseDoc
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-- addButcherDebugCommand
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reorderStart
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printHelp <- addSimpleBoolFlag "h" ["help"] mempty
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printVersion <- addSimpleBoolFlag "" ["version"] mempty
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printLicense <- addSimpleBoolFlag "" ["license"] mempty
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noUserConfig <- addSimpleBoolFlag "" ["no-user-config"] mempty
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configPaths <- addFlagStringParams
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""
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["config-file"]
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"PATH"
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(flagHelpStr "path to config file") -- TODO: allow default on addFlagStringParam ?
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cmdlineConfig <- cmdlineConfigParser
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suppressOutput <- addSimpleBoolFlag
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""
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["suppress-output"]
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(flagHelp $ parDoc
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"suppress the regular output, i.e. the transformed haskell source"
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)
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_verbosity <- addSimpleCountFlag
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"v"
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["verbose"]
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(flagHelp $ parDoc "[currently without effect; TODO]")
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checkMode <- addSimpleBoolFlag
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"c"
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["check-mode"]
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(flagHelp
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(PP.vcat
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[ PP.text "check for changes but do not write them out"
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, PP.text "exits with code 0 if no changes necessary, 1 otherwise"
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, PP.text "and print file path(s) of files that have changes to stdout"
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]
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)
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)
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writeMode <- addFlagReadParam
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""
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["write-mode"]
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"(display|inplace)"
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(flagHelp
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(PP.vcat
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[ PP.text "display: output for any input(s) goes to stdout"
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, PP.text "inplace: override respective input file (without backup!)"
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]
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)
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Data.Monoid.<> flagDefault Display
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)
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inputParams <- addParamNoFlagStrings
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"PATH"
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(paramHelpStr "paths to input/inout haskell source files")
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reorderStop
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addCmdImpl $ void $ do
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when printLicense $ do
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print licenseDoc
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System.Exit.exitSuccess
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when printVersion $ do
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do
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putStrLn $ "brittany version " ++ showVersion version
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putStrLn $ "Copyright (C) 2016-2019 Lennart Spitzner"
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putStrLn $ "Copyright (C) 2019 PRODA LTD"
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putStrLn $ "There is NO WARRANTY, to the extent permitted by law."
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System.Exit.exitSuccess
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when printHelp $ do
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liftIO
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$ putStrLn
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$ PP.renderStyle PP.style { PP.ribbonsPerLine = 1.0 }
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$ ppHelpShallow helpDesc
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System.Exit.exitSuccess
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let
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inputPaths = if null inputParams then [Nothing] else map Just inputParams
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let
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outputPaths = case writeMode of
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Display -> repeat Nothing
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Inplace -> inputPaths
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configsToLoad <- liftIO $ if null configPaths
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then
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maybeToList <$> (Directory.getCurrentDirectory >>= findLocalConfigPath)
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else pure configPaths
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config <-
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runMaybeT
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(if noUserConfig
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then readConfigs cmdlineConfig configsToLoad
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else readConfigsWithUserConfig cmdlineConfig configsToLoad
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)
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>>= \case
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Nothing -> System.Exit.exitWith (System.Exit.ExitFailure 53)
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Just x -> return x
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when (config & _conf_debug & _dconf_dump_config & confUnpack)
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$ trace (showConfigYaml config)
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$ return ()
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results <- zipWithM
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(coreIO putStrErrLn config suppressOutput checkMode)
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inputPaths
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outputPaths
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if checkMode
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then when (Changes `elem` (Data.Either.rights results))
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$ System.Exit.exitWith (System.Exit.ExitFailure 1)
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else case results of
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xs | all Data.Either.isRight xs -> pure ()
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[Left x] -> System.Exit.exitWith (System.Exit.ExitFailure x)
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_ -> System.Exit.exitWith (System.Exit.ExitFailure 1)
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data ChangeStatus = Changes | NoChanges
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deriving (Eq)
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-- | The main IO parts for the default mode of operation, and after commandline
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-- and config stuff is processed.
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coreIO
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:: (String -> IO ()) -- ^ error output function. In parallel operation, you
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-- may want serialize the different outputs and
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-- consequently not directly print to stderr.
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-> Config -- ^ global program config.
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-> Bool -- ^ whether to supress output (to stdout). Purely IO flag, so
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-- currently not part of program config.
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-> Bool -- ^ whether we are (just) in check mode.
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-> Maybe FilePath.FilePath -- ^ input filepath; stdin if Nothing.
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-> Maybe FilePath.FilePath -- ^ output filepath; stdout if Nothing.
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-> IO (Either Int ChangeStatus) -- ^ Either an errorNo, or the change status.
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coreIO putErrorLnIO config suppressOutput checkMode inputPathM outputPathM =
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ExceptT.runExceptT $ do
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let putErrorLn = liftIO . putErrorLnIO :: String -> ExceptT.ExceptT e IO ()
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let ghcOptions = config & _conf_forward & _options_ghc & runIdentity
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-- there is a good of code duplication between the following code and the
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-- `pureModuleTransform` function. Unfortunately, there are also a good
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-- amount of slight differences: This module is a bit more verbose, and
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-- it tries to use the full-blown `parseModule` function which supports
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-- CPP (but requires the input to be a file..).
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let cppMode = config & _conf_preprocessor & _ppconf_CPPMode & confUnpack
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-- the flag will do the following: insert a marker string
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-- ("-- BRITANY_INCLUDE_HACK ") right before any lines starting with
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-- "#include" before processing (parsing) input; and remove that marker
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-- string from the transformation output.
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-- The flag is intentionally misspelled to prevent clashing with
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-- inline-config stuff.
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let
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hackAroundIncludes =
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config & _conf_preprocessor & _ppconf_hackAroundIncludes & confUnpack
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let
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exactprintOnly = viaGlobal || viaDebug
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where
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viaGlobal = config & _conf_roundtrip_exactprint_only & confUnpack
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viaDebug =
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config & _conf_debug & _dconf_roundtrip_exactprint_only & confUnpack
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let
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cppCheckFunc dynFlags = if GHC.xopt GHC.Cpp dynFlags
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then case cppMode of
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CPPModeAbort -> do
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return $ Left "Encountered -XCPP. Aborting."
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CPPModeWarn -> do
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putErrorLnIO
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$ "Warning: Encountered -XCPP."
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++ " Be warned that -XCPP is not supported and that"
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++ " brittany cannot check that its output is syntactically"
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++ " valid in its presence."
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return $ Right True
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CPPModeNowarn -> return $ Right True
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else return $ Right False
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(parseResult, originalContents) <- case inputPathM of
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Nothing -> do
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-- TODO: refactor this hack to not be mixed into parsing logic
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let
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hackF s = if "#include" `isPrefixOf` s
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then "-- BRITANY_INCLUDE_HACK " ++ s
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else s
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let
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hackTransform = if hackAroundIncludes && not exactprintOnly
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then List.intercalate "\n" . fmap hackF . lines'
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else id
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inputString <- liftIO System.IO.getContents
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parseRes <- liftIO $ parseModuleFromString
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ghcOptions
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"stdin"
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cppCheckFunc
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(hackTransform inputString)
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return (parseRes, Text.pack inputString)
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Just p -> liftIO $ do
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parseRes <- parseModule ghcOptions p cppCheckFunc
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inputText <- Text.IO.readFile p
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-- The above means we read the file twice, but the
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-- GHC API does not really expose the source it
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-- read. Should be in cache still anyways.
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--
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-- We do not use TextL.IO.readFile because lazy IO is evil.
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-- (not identical -> read is not finished ->
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-- handle still open -> write below crashes - evil.)
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return (parseRes, inputText)
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case parseResult of
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Left left -> do
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putErrorLn "parse error:"
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putErrorLn left
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ExceptT.throwE 60
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Right (parsedSource, hasCPP) -> do
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let moduleElementList = splitModuleDecls parsedSource
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(inlineConf, perItemConf) <- do
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resE <-
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liftIO
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$ ExceptT.runExceptT
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$ extractCommentConfigs
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putErrorLnIO
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(extractDeclMap parsedSource)
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moduleElementList
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case resE of
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Left (err, input) -> do
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putErrorLn $ "Error: parse error in inline configuration:"
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putErrorLn err
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putErrorLn $ " in the string \"" ++ input ++ "\"."
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ExceptT.throwE 61
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Right c -> -- trace (showTree c) $
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pure c
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let moduleConf = cZipWith fromOptionIdentity config inlineConf
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when (config & _conf_debug & _dconf_dump_ast_full & confUnpack) $ do
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let val = printTreeWithCustom 160 customLayouterF parsedSource
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putErrorLn ("---- ast ----\n" ++ show val)
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let
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disableFormatting =
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moduleConf & _conf_disable_formatting & confUnpack
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(errsWarns, outSText, hasChanges) <- do
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if
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| disableFormatting -> do
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pure ([], originalContents, False)
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| exactprintOnly -> do
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let r = Text.pack $ ExactPrint.exactPrint parsedSource
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pure ([], r, r /= originalContents)
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| otherwise -> do
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let
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omitCheck =
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moduleConf
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& _conf_errorHandling
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.> _econf_omit_output_valid_check
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.> confUnpack
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(ews, outRaw) <- if hasCPP || omitCheck
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then liftIO $ processModule (TraceFunc putErrorLnIO) moduleConf perItemConf moduleElementList
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else liftIO
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$ pPrintModuleAndCheck (TraceFunc putErrorLnIO) moduleConf perItemConf moduleElementList
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let
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hackF s = fromMaybe s $ TextL.stripPrefix
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(TextL.pack "-- BRITANY_INCLUDE_HACK ")
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s
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let
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out = TextL.toStrict $ if hackAroundIncludes
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then
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TextL.intercalate (TextL.pack "\n")
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$ hackF
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<$> TextL.splitOn (TextL.pack "\n") outRaw
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else outRaw
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out' <- if moduleConf & _conf_obfuscate & confUnpack
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then lift $ obfuscate out
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else pure out
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pure $ (ews, out', out' /= originalContents)
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let
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customErrOrder ErrorInput{} = 4
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customErrOrder LayoutWarning{} = -1 :: Int
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customErrOrder ErrorOutputCheck{} = 1
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customErrOrder ErrorUnusedComment{} = 2
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customErrOrder ErrorUnusedComments{} = 3
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customErrOrder ErrorUnknownNode{} = -2 :: Int
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customErrOrder ErrorMacroConfig{} = 5
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unless (null errsWarns) $ do
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let
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groupedErrsWarns =
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Data.List.Extra.groupOn customErrOrder
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$ List.sortOn customErrOrder
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$ errsWarns
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groupedErrsWarns `forM_` \case
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(ErrorOutputCheck{} : _) -> do
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putErrorLn
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$ "ERROR: brittany pretty printer"
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++ " returned syntactically invalid result."
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(ErrorInput str : _) -> do
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putErrorLn $ "ERROR: parse error: " ++ str
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uns@(ErrorUnknownNode{} : _) -> do
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putErrorLn
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$ "WARNING: encountered unknown syntactical constructs:"
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uns `forM_` \case
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ErrorUnknownNode str ast@(L loc _) -> do
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putErrorLn $ " " <> str <> " at " <> showSDocUnsafe (ppr loc)
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when
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(config
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& _conf_debug
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& _dconf_dump_ast_unknown
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& confUnpack
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)
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$ do
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putErrorLn $ " " ++ show (astToDoc ast)
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_ -> error "cannot happen (TM)"
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putErrorLn
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" -> falling back on exactprint for this element of the module"
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warns@(LayoutWarning{} : _) -> do
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putErrorLn $ "WARNINGS:"
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warns `forM_` \case
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LayoutWarning str -> putErrorLn str
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_ -> error "cannot happen (TM)"
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unused@(ErrorUnusedComment{} : _) -> do
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putErrorLn
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$ "Error: detected unprocessed comments."
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++ " The transformation output will most likely"
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++ " not contain some of the comments"
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++ " present in the input haskell source file."
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putErrorLn $ "Affected are the following comments:"
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unused `forM_` \case
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ErrorUnusedComment str -> putErrorLn str
|
|
_ -> error "cannot happen (TM)"
|
|
unused@(ErrorUnusedComments{} : _) -> do
|
|
unused `forM_` \case
|
|
ErrorUnusedComments (L (GHC.SrcSpanAnn _ ann) _) cIn cOut -> do
|
|
putErrorLn
|
|
$ "Error: detected unprocessed comments ("
|
|
++ show cOut ++ " out of " ++ show cIn ++ ")."
|
|
++ " The transformation output will most likely"
|
|
++ " not contain some of the comments"
|
|
++ " present in the input haskell source file."
|
|
putErrorLn $ "Affected is the declaration at " ++ show (astToDoc ann)
|
|
_ -> error "cannot happen (TM)"
|
|
(ErrorMacroConfig err input : _) -> do
|
|
putErrorLn $ "Error: parse error in inline configuration:"
|
|
putErrorLn err
|
|
putErrorLn $ " in the string \"" ++ input ++ "\"."
|
|
[] -> error "cannot happen"
|
|
-- TODO: don't output anything when there are errors unless user
|
|
-- adds some override?
|
|
let
|
|
hasErrors =
|
|
if config & _conf_errorHandling & _econf_Werror & confUnpack
|
|
then not $ null errsWarns
|
|
else 0 < maximum (-1 : fmap customErrOrder errsWarns)
|
|
outputOnErrs =
|
|
config
|
|
& _conf_errorHandling
|
|
& _econf_produceOutputOnErrors
|
|
& confUnpack
|
|
shouldOutput =
|
|
not suppressOutput
|
|
&& not checkMode
|
|
&& (not hasErrors || outputOnErrs)
|
|
|
|
when shouldOutput
|
|
$ addTraceSep (_conf_debug config)
|
|
$ case outputPathM of
|
|
Nothing -> liftIO $ Text.IO.putStr $ outSText
|
|
Just p -> liftIO $ do
|
|
let
|
|
shouldWrite = case inputPathM of
|
|
Nothing -> True
|
|
Just p2 -> hasChanges || p /= p2
|
|
when shouldWrite $ Text.IO.writeFile p $ outSText
|
|
|
|
when (checkMode && hasChanges) $ case inputPathM of
|
|
Nothing -> pure ()
|
|
Just p -> liftIO $ putStrLn $ "formatting would modify: " ++ p
|
|
|
|
when hasErrors $ ExceptT.throwE 70
|
|
return (if hasChanges then Changes else NoChanges)
|
|
where
|
|
addTraceSep conf =
|
|
if or
|
|
[ confUnpack $ _dconf_dump_annotations conf
|
|
, confUnpack $ _dconf_dump_ast_unknown conf
|
|
, confUnpack $ _dconf_dump_ast_full conf
|
|
, confUnpack $ _dconf_dump_bridoc_raw conf
|
|
, confUnpack $ _dconf_dump_bridoc_simpl_alt conf
|
|
, confUnpack $ _dconf_dump_bridoc_simpl_floating conf
|
|
, confUnpack $ _dconf_dump_bridoc_simpl_columns conf
|
|
, confUnpack $ _dconf_dump_bridoc_simpl_indent conf
|
|
, confUnpack $ _dconf_dump_bridoc_final conf
|
|
]
|
|
then trace "----"
|
|
else id
|