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1 Emacs tags/hasktags

1.1 Get hasktags

ETAGS allows jumping to the definition of names at the point via M-.. To generate tags (a TAGS file) for a project, you need hasktags.

$ cabal install hasktags

1.2 Calling directly

Run M-x haskell-process-generate-tags to generate the TAGS file of the current session directory.

You can now use M-. on a name in a Haskell buffer which will jump directly to its definition. You can also now use it for autocompletion.

1.3 On save

Provided you have properly bound C-x C-s, you just need to enable tags generation on save:

(custom-set-variables
 '(haskell-tags-on-save t))

or

(setq haskell-tags-on-save t)

or just M-x customize-group haskell and it's in there.

2 Speedbar

Emacs has a SpeedBar which works quite nice together with haskell-mode and also detects syntactic elements such as variables, imports, instances, classes.

Just add

   (require 'speedbar)
   (speedbar-add-supported-extension ".hs")

to your .emacs file and fire up speedbar with M-x speedbar.