Symbol documentation and implementation code in haskell-mode

Question

I'm learning Haskell. One of first steps was to make pleasant development environment. I've already found haskell-mode, intero and some more useful packages but I miss offline/online documentation for the symbol at point.

What I've already found looks alike what I need is this but have no success with configuration. I have cabal installed from haskell-platform on ubuntu 14.04 but don't have ~/.cabal/share/doc/. What I expect is when the cursor is on e.g. repeat function and C-c C-d is presed it shows the some documentation for the function. It's nice to have some basic information about function signature in mini buffer but for a newcomer it would be great to have access to full documentation.

What is prefered way to get symbols full documentation inside Emacs?

Answer 1

Hoogle is what I serching for. At this moment there is (at least) two ways to integrate it nicely with Emacs.

• Directly through haskell-mode. Fuction which should be called with cursor on desired symbol is haskell-hoogle-lookup-from-local. It will ask you to run hoogle local server for the first time.
  You also have to install hoogle in your stack sandbox via:

  stack install hoogle

  and you have to generate hoogle local documentation with:

  hoogle generate

• Using helm-dash which supports many other languages and envirnoments. Function which should be called when the cursor is on desired symbol is called helm-dash-at-point. You should also install Haskell docset with M-x helm-dash-install-docset RET Haskell RET and activate Haskell docset with M-x helm-dash-activate-docset RET Haskell RET (there is also a way to activate corresponding docset acording to active mode/language described here).