Haskell configuration file ~/.ghc/ghic.conf for Haskell 8.0.1

ghci-conf-test.hs

--  Test of ghci.conf 
-- 

> :{
- add :: Int -> Int -> Int 
- add x y = x * y 
- :}
add :: Int -> Int -> Int
> add 10 20
200
it :: Int
> 


> :cd ~/Documents
> :cd ~/Documents/projects
> :ls .
.
..
boleto.fsharp
bookmarklet-maker.web
...

> :ls /
etc
proc
sys
lost+found
var
.manjaro-tools
.
sbin
mnt
tmp
root
usr
lib
opt
...

--  Pasting code in the repl 
-- 
> :{
- maybeToEither :: err -> Maybe value -> Either err value 
- maybeToEither e m =
-   case m of
-     Just v   -> Right v
-     Nothing  -> Left  e
- :}
maybeToEither :: err -> Maybe value -> Either err value
> 

ghci.conf

import System.Directory ( getCurrentDirectory, getDirectoryContents)
import System.Process (readProcess)
import Control.Monad (mapM_)

-- Set prompt to > 
:set prompt "> " 
:set prompt2 "- "

:def source readFile 

:def hoogle \s -> return $ ":! hoogle --count=15 \"" ++ s ++ "\""

-- The command :pwd shows the current directory 
--
:def pwd \_ -> getCurrentDirectory >>= putStrLn >> return ""

-- Show current directory 
--
:def ls \input -> getDirectoryContents input >>= mapM_ putStrLn >> return ""

-- Print type after evaluation 
:set +t 

-- Allow multi-line command 
:set +m