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Haddock, a Haskell Documentation Tool

About haddock

This is Haddock, a tool for automatically generating documentation from annotated Haskell source code. It is primary intended for documenting library interfaces, but it should be useful for any kind of Haskell code.

Haddock lets you write documentation annotations next to the definitions of functions and types in the source code, in a syntax that is easy on the eye when writing the source code (no heavyweight mark-up). The documentation generated by Haddock is fully hyperlinked

  • click on a type name in a type signature to go straight to the definition, and documentation, for that type.

Haddock understands Haskell's module system, so you can structure your code however you like without worrying that internal structure will be exposed in the generated documentation. For example, it is common to implement a library in several modules, but define the external API by having a single module which re-exports parts of these implementation modules. Using Haddock, you can still write documentation annotations next to the actual definitions of the functions and types in the library, but the documentation annotations from the implementation will be propagated to the external API when the documentation is generated. Abstract types and classes are handled correctly. In fact, even without any documentation annotations, Haddock can generate useful documentation from your source code.

Documentation formats

Haddock can generate documentation in multiple formats; currently HTML is implemented, and there is partial support for generating LaTeX and Hoogle.

Source code documentation

Full documentation can be found in the doc/ subdirectory, in DocBook format.


Please create issues when you have any problems and pull requests if you have some code.


To get started you'll need a latest GHC release installed. Below is an example setup using cabal sandboxes.

  git clone
  cd haddock
  cabal sandbox init
  cabal sandbox add-source haddock-library
  cabal sandbox add-source haddock-api
  # adjust -j to the number of cores you want to use
  cabal install -j4 --dependencies-only --enable-tests
  cabal configure --enable-tests
  cabal build -j4
  # run the test suite
  cabal test

If you're a GHC developer and want to update Haddock to work with your changes, you should be working on ghc-head branch instead of master. See instructions at for an example workflow.

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