xmonad-0.10: tests/loc.hs
import Control.Monad
import System.Exit
main = do foo <- getContents
let actual_loc = filter (not.null) $ filter isntcomment $
map (dropWhile (==' ')) $ lines foo
loc = length actual_loc
print loc
-- uncomment the following to check for mistakes in isntcomment
-- print actual_loc
isntcomment ('-':'-':_) = False
isntcomment ('{':'-':_) = False -- pragmas
isntcomment _ = True