85 lines
2.7 KiB
Haskell
85 lines
2.7 KiB
Haskell
{-# LANGUAGE MultiWayIf #-}
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{-# LANGUAGE QuasiQuotes #-}
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{-# LANGUAGE TupleSections #-}
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module Main where
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import Control.Monad
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import qualified Nix
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import Nix.Expr.Types.Annotated (stripAnnotation)
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import Nix.Lint
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import Nix.Parser
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import Nix.Pretty
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import Nix.TH
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import Options.Applicative hiding (ParserResult(..))
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import System.IO
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import Text.PrettyPrint.ANSI.Leijen hiding ((<$>))
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data Options = Options
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{ verbose :: Bool
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, debug :: Bool
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, evaluate :: Bool
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, check :: Bool
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, filePath :: Maybe FilePath
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, expression :: Maybe String
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}
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mainOptions :: Parser Options
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mainOptions = Options
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<$> switch
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( short 'v'
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<> long "verbose"
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<> help "Verbose output")
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<*> switch
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( short 'd'
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<> long "debug"
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<> help "Debug output")
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<*> switch
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( long "eval"
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<> help "Whether to evaluate, or just pretty-print")
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<*> switch
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( long "check"
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<> help "Whether to check for syntax errors after parsing")
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<*> optional (strOption
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( short 'f'
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<> long "file"
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<> help "File to parse or evaluate"))
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<*> optional (strOption
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( short 'e'
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<> long "expr"
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<> help "Expression to parse or evaluate"))
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main :: IO ()
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main = do
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opts <- execParser optsDef
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(eres, mpath) <- case expression opts of
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Just s -> return (parseNixStringLoc s, Nothing)
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Nothing -> case filePath opts of
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Nothing -> (, Nothing) . parseNixStringLoc <$> getContents
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Just "-" -> (, Nothing) . parseNixStringLoc <$> getContents
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Just path -> (, Just path) <$> parseNixFileLoc path
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-- print . printNix =<< Nix.eval [nix|1 + 3|]
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case eres of
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Failure err -> hPutStrLn stderr $ "Parse failed: " ++ show err
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Success expr -> do
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when (check opts) $
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putStrLn =<< Nix.runLintM . renderSymbolic
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=<< Nix.lint (stripAnnotation expr)
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if | evaluate opts, debug opts ->
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print =<< Nix.tracingEvalLoc mpath expr
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| evaluate opts ->
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putStrLn . printNix =<< Nix.evalLoc mpath expr
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| debug opts ->
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print expr
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| otherwise ->
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displayIO stdout
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. renderPretty 0.4 80
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. prettyNix
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. stripAnnotation $ expr
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where
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optsDef :: ParserInfo Options
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optsDef = info (helper <*> mainOptions)
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(fullDesc <> progDesc "" <> header "hnix")
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