Support company-mode docs and source with haskell-mode backend

[lukehoersten]

From the company-mode docs:

When the completion candidates are shown, press to display the documentation for the selected candidate, or C-w to see its source. Not all back-ends support this.

[lukehoersten]

Ping @geraldus

[creichert]

company-ghc uses hoogle search --info <ident> to populate the doc buffer: https://github.com/iquiw/company-ghc/blob/master/company-ghc.el#L193.

auto-complete does support this feature with the F1 key as well. Different auto-complete sources utilize it in different ways but I like the haddock.

I pasted a screenshot in #215 and it would be nice to allow some options for what kind of docs are shown. I can help test auto-complete if needed.

[lukehoersten]

I was under the impression company-ghc depended on ghc-mod which I don't use. I use haskell-process etc instead. Perhaps we need to rethink how all this ties together?

[lukehoersten]

Looks like this is redundant with #215 - thank's @creichert

[creichert]

The doc buffer uses hoogle (although the rest of company-ghc does use ghc-mod).

My only point was this is something we could most likely support relatively easily in both auto-complete and company-ghc. I definitely want this feature too.

[lukehoersten]

Understood. Good point.
On Tue, Jun 23, 2015 at 7:48 PM Christopher Reichert <
notifications@github.com> wrote:

The doc buffer uses hoogle (although the rest of company-ghc does use
ghc-mod).

My only point was this is something we could most likely support
relatively easily in both auto-complete and company-ghc. I definitely want
this feature too.

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