import Control.Monad
import Data.List
import System.Console.Readline
import System.Environment

getShellCompl :: String -> IO [String]
getShellCompl s 
    | s /= "" && last s /= ' ' = do
  fl <- filenameCompletionFunction s
  c <- commandCompletionFunction s
  return $ sort . nub $ fl ++ c
    | otherwise = return []

commandCompletionFunction :: String -> IO [String]
commandCompletionFunction str 
    | '/' `elem` str = return []
    | otherwise = do
  p <- getEnv "PATH"
  cl p
    where
      cl = liftM (nub . rmPath . concat) . mapM fCF . map addToPath . split ':'  
      addToPath = flip (++) ("/" ++ str)
      fCF = filenameCompletionFunction

rmPath :: [String] -> [String]
rmPath s = 
    map (reverse . fst . break  (=='/') . reverse) s

split :: Eq a => a -> [a] -> [[a]]
split _ [] = []
split e l =
    f : split e (rest ls)
        where 
          (f,ls) = span (/=e) l
          rest s | s == [] = []
                 | otherwise = tail s


main = do
  a <- getArgs
  putStrLn =<< fmap (show . length) (getShellCompl $ a !! 0)