[Haskell-cafe] walking a directory tree efficiently

Hi. During a tentative (quite unsuccessfull) to convert a simple Python script that prints on stdout a directory and all its subdirectory [1] in a good Haskell (mostly to start to do real practice with the language), I came across this blog post: http://blog.moertel.com/articles/2007/03/28/directory-tree-printing-in-haske... Since recently I read about alternatives to lazy IO (like iteratee), I'm curious to know if a flexible, efficient and safe alternative exists, for the task of display a directory tree. [1] http://paste.pocoo.org/show/99523/ Thanks Manlio perillo