パスの中のファイル名を得る
System.FilePathモジュールのtakeFileNameが使えます。
$ ghci GHCi, version 6.12.2: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package ffi-1.0 ... linking ... done. Prelude> :module System.FilePath Prelude System.FilePath> takeFileName "foo/bar/baz" Loading package filepath-1.1.0.4 ... linking ... done. "baz"