The ~/.cabal/config stores configuration which cabal-install uses. I wanted to do some hackery on it. (Specifically, having multiple GHC versions installed, I wish to have separate documentation indexes).
I couldn't, however, find any documentation about its' syntax or variables except for what is included in default file. Is there any documentation available?
Edit: I've stated the goal above, but let me add some details: If the same package (eg. GTK) is installed in two versions of GHC they end up in the same documentation index file. I wan't that local documentation index to be separate for each GHC installation. I believe it is possible in some way using documentation directory setting, but there has to be a variable for currently used GHC version. If there isn't one there might be some workarounds available, but I won't be able to say that unless I see the documentation.
This seems to work, although I've only tested it with one version of GHC:
documentation: True
doc-index-file: $datadir/doc/$compiler/index.html
install-dirs user
docdir: $datadir/doc/$compiler/$pkgid
With the other options left at the default, this generates documentation in .cabal/share/doc/<ghc-version>/<package-name>, and the index in .cabal/share/doc/<ghc-version>/index.html.