haskdogs don't recognise package installed from source code.

[yihuang]

I don't even know if it's possible, maybe there's no way to know where the source code directory of a package is.

[ierton]

Well, haskdogs uses ghc-pkg to find the package containing given module name. For example, you can find that Control.Monad belongs to base-4.3.1.0 (on my system) using

smironov@tenten ~ $ ghc-pkg find-module Control.Monad
/usr/lib/ghc-7.0.4/package.conf.d
base-4.3.1.0
haskell2010-1.0.0.0
/home/smironov/.ghc/i386-linux-7.0.4/package.conf.d

Could you please try this command with a module name installed from source?

[yihuang]

ghc-pkg find-module find the package ok, but cabal unpack can't find it.

[ierton]

Hm, one can introduce new option - haskell projects directory to scan in addition to cabal unpack. And here is another thing: can you manually copy (or link) your module into ~/.haskdogs/ and see whether haskdogs can find it?