On Wed, Jan 14, 2009 at 3:12 PM, Neil Mitchell
2) In Python it is possible to import modules inside a function.
In Haskell something like:
joinPath' root name = joinPath [root, name] importing System.FilePath (joinPath)
Looks a bit ugly, but kind of useful. I'd make the syntax:
joinPath' root name = joinPath [root,name] where import System.FilePath(joinPath)
It does mean you need to read an entire file to see what functions it imports, but perhaps that is the way it should be. I could also imagine a syntax:
joinPath' root name = import.System.FilePath.joinPath [root,name]
i.e. doing an import and use at the same time.
This can be done with a fully-qualified name (or two). Not quite as succinct, but I assume the scope of these imports is only local anyway.
joinPath root path = jp [root,filename path] where jp = System.FilePath.joinPath filename = System.FilePath.takeFileName
or
joinPath root path = System.FilePath.joinPath [root,System.FilePath.takeFileName path]
Cheers, D