Build base SASS stylesheet

[boj]

https://hackage.haskell.org/package/hsass

From https://codinginfinity.me/post/2015-07-12/hlibsass_and_hsass

import Control.Monad      ((>=>))
import System.Environment (getProgName, getArgs)
import Text.Sass

main :: IO ()
main = do
    progName <- getProgName
    args <- getArgs
    case args of
        (f:_) -> compile f
        _     -> putStrLn $ "Usage: " ++ progName ++ " FILE"

compile :: FilePath -> IO ()
compile file = do
    result <- compileFile file def
    either (errorMessage >=> putStrLn) putStrLn result