45 lines
902 B
Haskell
45 lines
902 B
Haskell
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module Language.Elna.CommandLine
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( CommandLine(..)
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, commandLine
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, execParser
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) where
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import Options.Applicative
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( Parser
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, ParserInfo(..)
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, argument
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, execParser
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, fullDesc
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, help
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, helper
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, info
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, long
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, metavar
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, optional
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, progDesc
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, short
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, str
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, strOption
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)
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import Control.Applicative ((<**>))
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data CommandLine = CommandLine
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{ input :: FilePath
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, output :: Maybe FilePath
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} deriving (Eq, Show)
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parser :: Parser CommandLine
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parser = CommandLine
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<$> argument str inFile
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<*> optional (strOption outFile)
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where
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inFile = metavar "INFILE" <> help "Input file."
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outFile = long "output"
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<> short 'o'
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<> metavar "OUTFILE"
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<> help "Output file."
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commandLine :: ParserInfo CommandLine
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commandLine = info (parser <**> helper)
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$ fullDesc <> progDesc "Elna compiler."
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