Re: [Haskell-cafe] Re: Coding conventions for Haskell?

27 Sep 2010

      On Mon, Sep 27, 2010 at 8:20 AM, Richard O'Keefe  wrote:
...
On Sep 27, 2010, at 5:31 AM, Maciej Piechotka wrote:
...
May I ask clarification about formatting (according to your convention)
doSomething :: (a -> a -> a) -> a -> a -> a
doSomething f x = f y y
                 where y = f x x
i.e. single line function+where
There is a meta-rule that I use for indentation in a wide range of
languages:  where the line breaks are may depend on identifier spelling,
but what the indentation is should not.
In Haskell I sometimes violate that, but I usually end up regretting it.
+1

I use the same rule. My style looks like this.

module Module
  where ( FancyType (..)
        , main
        )

data FancyType a b
  = FirstConstructor a
  | SecondConstructor b
  deriving (Show)

f a b
  | a > 0 = FisrtConstructor a
  | otherwise = SecondConstructor g
  where g = h b
        h = id

main =
  do putStrLn hello
     putStrLn . concat
       [ hello
       , show (f 25 1)
       ]
     flip mapM_ [1..100] $ \n ->
       do print n
          putStrLn hello
  where hello = "Hello"

I allways use spaces without tabs and allways use camelCase.

-- 
Victor Nazarov