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--------------------------------------------------------------------------------
{-# LANGUAGE OverloadedStrings #-}
module Language.Haskell.Stylish.Config
( Extensions
, Config (..)
, defaultConfigFilePath
, configFilePath
, loadConfig
) where
--------------------------------------------------------------------------------
import Control.Applicative (pure, (<$>),
(<*>))
import Control.Monad (forM, mzero)
import Data.Aeson (FromJSON (..))
import qualified Data.Aeson as A
import qualified Data.Aeson.Types as A
import qualified Data.ByteString as B
import Data.List (inits,
intercalate)
import Data.Map (Map)
import qualified Data.Map as M
import Data.Yaml (decodeEither)
import System.Directory
import System.FilePath (joinPath,
splitPath,
(</>))
--------------------------------------------------------------------------------
import Language.Haskell.Stylish.Step
import qualified Language.Haskell.Stylish.Step.Imports as Imports
import qualified Language.Haskell.Stylish.Step.LanguagePragmas as LanguagePragmas
import qualified Language.Haskell.Stylish.Step.Records as Records
import qualified Language.Haskell.Stylish.Step.Tabs as Tabs
import qualified Language.Haskell.Stylish.Step.TrailingWhitespace as TrailingWhitespace
import qualified Language.Haskell.Stylish.Step.UnicodeSyntax as UnicodeSyntax
import Language.Haskell.Stylish.Verbose
import Paths_stylish_haskell (getDataFileName)
--------------------------------------------------------------------------------
type Extensions = [String]
--------------------------------------------------------------------------------
data Config = Config
{ configSteps :: [Step]
, configColumns :: Int
, configLanguageExtensions :: [String]
}
--------------------------------------------------------------------------------
instance FromJSON Config where
parseJSON = parseConfig
--------------------------------------------------------------------------------
emptyConfig :: Config
emptyConfig = Config [] 80 []
--------------------------------------------------------------------------------
configFileName :: String
configFileName = ".stylish-haskell.yaml"
--------------------------------------------------------------------------------
defaultConfigFilePath :: IO FilePath
defaultConfigFilePath = getDataFileName "data/stylish-haskell.yaml"
--------------------------------------------------------------------------------
configFilePath :: Verbose -> Maybe FilePath -> IO (Maybe FilePath)
configFilePath _ (Just userSpecified) = return $ Just userSpecified
configFilePath verbose Nothing = do
current <- getCurrentDirectory
home <- getHomeDirectory
def <- defaultConfigFilePath
search $
[d </> configFileName | d <- ancestors current] ++
[home </> configFileName, def]
where
-- All ancestors of a dir (including that dir)
ancestors :: FilePath -> [FilePath]
ancestors = init . map joinPath . reverse . inits . splitPath
search :: [FilePath] -> IO (Maybe FilePath)
search [] = return Nothing
search (f : fs) = do
-- TODO Maybe catch an error here, dir might be unreadable
exists <- doesFileExist f
verbose $ f ++ if exists then " exists" else " does not exist"
if exists then return (Just f) else search fs
--------------------------------------------------------------------------------
loadConfig :: Verbose -> Maybe FilePath -> IO Config
loadConfig verbose mfp = do
mfp' <- configFilePath verbose mfp
case mfp' of
Nothing -> do
verbose $ "Using empty configuration"
return emptyConfig
Just fp -> do
verbose $ "Loading configuration at " ++ fp
bs <- B.readFile fp
case decodeEither bs of
Left err -> error $
"Language.Haskell.Stylish.Config.loadConfig: " ++ err
Right config -> return config
--------------------------------------------------------------------------------
parseConfig :: A.Value -> A.Parser Config
parseConfig (A.Object o) = do
-- First load the config without the actual steps
config <- Config
<$> pure []
<*> (o A..:? "columns" A..!= 80)
<*> (o A..:? "language_extensions" A..!= [])
-- Then fill in the steps based on the partial config we already have
stepValues <- o A..: "steps" :: A.Parser [A.Value]
steps <- mapM (parseSteps config) stepValues
return config {configSteps = concat steps}
parseConfig _ = mzero
--------------------------------------------------------------------------------
catalog :: Map String (Config -> A.Object -> A.Parser Step)
catalog = M.fromList
[ ("imports", parseImports)
, ("language_pragmas", parseLanguagePragmas)
, ("records", parseRecords)
, ("tabs", parseTabs)
, ("trailing_whitespace", parseTrailingWhitespace)
, ("unicode_syntax", parseUnicodeSyntax)
]
--------------------------------------------------------------------------------
parseSteps :: Config -> A.Value -> A.Parser [Step]
parseSteps config val = do
map' <- parseJSON val :: A.Parser (Map String A.Value)
forM (M.toList map') $ \(k, v) -> case (M.lookup k catalog, v) of
(Just parser, A.Object o) -> parser config o
_ -> fail $ "Invalid declaration for " ++ k
--------------------------------------------------------------------------------
-- | Utility for enum-like options
parseEnum :: [(String, a)] -> a -> Maybe String -> A.Parser a
parseEnum _ def Nothing = return def
parseEnum strs _ (Just k) = case lookup k strs of
Just v -> return v
Nothing -> fail $ "Unknown option: " ++ k ++ ", should be one of: " ++
intercalate ", " (map fst strs)
--------------------------------------------------------------------------------
parseImports :: Config -> A.Object -> A.Parser Step
parseImports config o = Imports.step
<$> pure (configColumns config)
<*> (Imports.Align
<$> (o A..:? "align" >>= parseEnum aligns Imports.Global)
<*> (o A..:? "list_align" >>= parseEnum listAligns Imports.SameLine)
<*> (o A..:? "long_list_align"
>>= parseEnum longListAligns Imports.Inline)
<*> (o A..:? "list_padding"
>>= (return . maybe 4 (max 1)))) -- Padding have to be at least 1.
where
aligns =
[ ("global", Imports.Global)
, ("file", Imports.File)
, ("group", Imports.Group)
, ("none", Imports.None)
]
listAligns =
[ ("new line", Imports.NewLine)
, ("same line", Imports.SameLine)
]
longListAligns =
[ ("inline", Imports.Inline)
, ("multiline", Imports.Multiline)
]
--------------------------------------------------------------------------------
parseLanguagePragmas :: Config -> A.Object -> A.Parser Step
parseLanguagePragmas config o = LanguagePragmas.step
<$> pure (configColumns config)
<*> (o A..:? "style" >>= parseEnum styles LanguagePragmas.Vertical)
<*> o A..:? "remove_redundant" A..!= True
where
styles =
[ ("vertical", LanguagePragmas.Vertical)
, ("compact", LanguagePragmas.Compact)
, ("compact_line", LanguagePragmas.CompactLine)
]
--------------------------------------------------------------------------------
parseRecords :: Config -> A.Object -> A.Parser Step
parseRecords _ _ = return Records.step
--------------------------------------------------------------------------------
parseTabs :: Config -> A.Object -> A.Parser Step
parseTabs _ o = Tabs.step
<$> o A..:? "spaces" A..!= 8
--------------------------------------------------------------------------------
parseTrailingWhitespace :: Config -> A.Object -> A.Parser Step
parseTrailingWhitespace _ _ = return TrailingWhitespace.step
--------------------------------------------------------------------------------
parseUnicodeSyntax :: Config -> A.Object -> A.Parser Step
parseUnicodeSyntax _ o = UnicodeSyntax.step
<$> o A..:? "add_language_pragma" A..!= True
|