Attoparsec Iteratee

I wanted, just to learn a bit about Iteratees, reimplement a simple parser I made, using Data.Iteratee and Data.Attoparsec.Iteratee. I'm pretty much stumped though. Below I have a simple example that is able to parse one line from a file. My parser reads one line at a time, so I need a way of feeding lines to the iteratee until it's done. I've read all I've found googling this, but a lot of the material on iteratee/enumerators is pretty advanced. This is the part of the code that matters:

-- There are more imports above.
import Data.Attoparsec.Iteratee
import Data.Iteratee (joinI, run)
import Data.Iteratee.IO (defaultBufSize, enumFile)

line :: Parser ByteString -- left the implementation out (it doesn't check for 
                             new line)

iter = parserToIteratee line

main = do
    p <- liftM head getArgs
    i <- enumFile defaultBufSize p $ iter
    i' <- run i
    print i'

This example will parse and print one line from a file with multiple lines. The original script mapped the parser over a list of ByteStrings. So I would like to do the same thing here. I found enumLinesin Iteratee, but I can't for the life of me figure out how to use it. Maybe I misunderstand its purpose?