{-# LANGUAGE RecordWildCards #-}
--
-- The main function that drives other commands.
--


import Data.Version          (showVersion)
import Data.Monoid
import Options.Applicative
import Raaz                  (version)

import           Command.Checksum
import           Command.CpuInfo
import           Command.Rand


data Option = ShowVersion
             | RunCommand (IO ())

progOption  :: Parser Option
progOption = flag ShowVersion ShowVersion versionMods
             <|> RunCommand <$> rand
             <|> RunCommand <$> checksum
             <|> RunCommand <$> cpuInfo

  where versionMods = short 'v'
                      <> long "version"
                      <> help "Print the version of the raaz library used"

---------------------- The main function and stuff ------------------------------
run :: Option -> IO ()
run ShowVersion      = putStrLn $ "raaz version " ++ showVersion version
run (RunCommand cmd) = cmd


main :: IO ()
main = execParser opts >>= run
  where opts = info (helper <*> progOption) $
               fullDesc
               <> header "raaz - A command line interface to the raaz cryptographic library."
               <> footer "Homepage: http://github.com/raaz-crypto"