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A documentation generator for Language:Haskell

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Haddock relies on module headers and simple comment conventions to generate documentation from Haskell source code. Consider, for example, the following module: 

{- | This comment is placed before the module header and thus
     is seen as the general description of the module. Since 
     the general description may be a bit longer, it is quite 
     common to see a multi-line comment in this position. -}

module Main (
 foo
) where

-- | The "|" character in the comment expresses that this
-- comment should contribute to the generated documentation.
-- Haddock does indeed search for such comments. 
-- We note that 'foo' is indeed exported and thus it 
-- deserves documentation. We could also use a multi-line 
-- comment of course.
foo :: () -> ()
foo = id

-- This function is not exported.
-- Thus, no Haddock comment is needed.
-- That is, the function will not appear in generated documentation.
bar :: () -> Bool
bar = const True

It uses Haddock comment conventions for the module description and the exported function foo. Haddock supports much more conventions and features; see the documentation. Haddock also nicely integrates with Technology:Cabal such that one can simply invoke "cabal haddock" to generate documentation for a given Haskell package.

(C) 2012-2024 softlang.org and contributors

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