2015-06-23 23:53:07 +02:00
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module Main where
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2018-03-28 06:59:27 +02:00
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import qualified Data.Map.Lazy as Map
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2018-03-28 07:21:17 +02:00
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import Nix.Builtins
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2018-03-28 06:59:27 +02:00
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import Nix.Eval
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import Nix.Parser
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import Nix.Pretty
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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 ((<$>))
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2015-06-23 23:53:07 +02:00
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2018-03-28 06:59:27 +02:00
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data Options = Options
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{ verbose :: Bool
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, debug :: Bool
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, evaluate :: Bool
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, filePath :: Maybe FilePath
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, expression :: Maybe String
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}
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2015-06-23 23:53:07 +02:00
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2018-03-28 06:59:27 +02:00
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mainOptions :: Parser Options
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mainOptions = Options
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<$> 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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<*> 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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2015-06-24 02:18:43 +02:00
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2015-06-23 23:53:07 +02:00
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main :: IO ()
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main = do
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2018-03-28 06:59:27 +02:00
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opts <- execParser optsDef
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eres <- case expression opts of
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Just s -> return $ parseNixString s
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Nothing -> case filePath opts of
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Just "-" -> parseNixString <$> getContents
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Nothing -> parseNixString <$> getContents
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Just path -> parseNixFile path
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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 ->
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if evaluate opts
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then if debug opts
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2018-03-28 07:21:17 +02:00
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then print =<< tracingExprEval expr <*> pure baseEnv
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else print $ evalExpr expr baseEnv
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2018-03-28 06:59:27 +02:00
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else displayIO stdout $ renderPretty 0.4 80 (prettyNix 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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