Is there a way to see the list of functions in a module, in GHCI?

Question

I find it handy in Python or Common Lisp that you can list a library's contents at runtime. Does Haskell have the same thing, in particular from a GHCI prompt?

Answer 1

GHCi has a :browse command to list the contents of modules:

Prelude> :browse Data.List (\\) :: (Eq a) => [a] -> [a] -> [a] delete :: (Eq a) => a -> [a] -> [a] deleteBy :: (a -> a -> Bool) -> a -> [a] -> [a] deleteFirstsBy :: (a -> a -> Bool) -> [a] -> [a] -> [a] elemIndex :: (Eq a) => a -> [a] -> Maybe Int ... Prelude> :help                     ...    :browse[!] [[*]<mod>]       display the names defined by module <mod>                                (!: more details; *: all top-level names) ... 

Answer 2

Depending on exactly what information you intend to extract... If your version of GHCi supports tab-completion, then you can use that to list all of a namespace's available functions:

Prelude> :m +Data.List Prelude Data.List> Data.List.<PRESS TAB KEY HERE> Display all 109 possibilities? (y or n) <PRESS n> Prelude Data.List> Data.List.un<PRESS TAB KEY HERE> Data.List.unfoldr  Data.List.unlines  Data.List.unzip3   Data.List.unzip6    Data.List.union    Data.List.unwords  Data.List.unzip4   Data.List.unzip7    Data.List.unionBy  Data.List.unzip    Data.List.unzip5