This library intergrates hasktags into emacs, making it easier to navigate through your code in emacs.
To be able to navigate through your haskell code in emacs faster, you may want to tag your code and use etags library supplied with emacs to do that.
One of such tools is hasktags and you can find some information on it on Haskell Wiki The program itself can be found in Hackage
To use the tags automatically, I've created a script for emacs, which would regenerate the TAGS when you save your file.
So, please install hasktags first:
cabal install hasktags
clone the project directory into your preferred location for emacs tools
git clone https://github.com/ptek/hasktags-emacs.git
and add these two lines into your .emacs file
(add-to-list 'load-path "<path-to-hasktags-emacs-directory>")
(load "hasktags")
To help emacs locate your project correctly, you will have to create TAGS file in your project root directory.
Just echo -n > TAGS and you are good to go.
You can now navigate to the function definitions using M-. and also use the other functionalities described in Emacs Wiki - EmacsTags Article