Haskell : loading ALL files in current directory path

Question

The command (in GHCi)

:load abc

Loads the functions in the file abc (which must exist in the current directory path). How would I load all

Answer 1

It's better if the filenames and the names of the modules will be the same:

➤ mv test1.hs NecessaryModule.hs
➤ ghci
GHCi, version 7.0.4: 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> :load test
[1 of 2] Compiling NecessaryModule  ( NecessaryModule.hs, interpreted )
[2 of 2] Compiling Main             ( test.hs, interpreted )
Ok, modules loaded: NecessaryModule, Main.

since the :load command load module(s) (by filenames) and their dependents (as you can read by typing :help or :? in the GHCi prompt).

Also the :load command erase all previous declarations which was defined in the current GHCi session, so for loading all files in the current directory you can do something like this:

Prelude> :q
Leaving GHCi.
➤ ghci *.hs
GHCi, version 7.0.4: 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.

:
    module `main:NecessaryModule' is defined in multiple files: NecessaryModule.hs
                                                            test2.hs
Failed, modules loaded: none.
Prelude> :q
Leaving GHCi.
➤ rm test2.hs
➤ ghci *.hs  
GHCi, version 7.0.4: 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.
[1 of 2] Compiling NecessaryModule  ( NecessaryModule.hs, interpreted )
[2 of 2] Compiling Main             ( test.hs, interpreted )
Ok, modules loaded: NecessaryModule, Main.
*NecessaryModule>