[GHC] #2630: installed packages should have a src-dirs field, for access to optionally installed sources

[GHC]

#2630: installed packages should have a src-dirs field, for access to optionally
installed sources
--------------------------------+-------------------------------------------
    Reporter:  claus            |       Owner:         
        Type:  feature request  |      Status:  new    
    Priority:  normal           |   Component:  GHC API
     Version:  6.9              |    Severity:  normal 
    Keywords:                   |    Testcase:         
Architecture:  Unknown          |          Os:  Unknown
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 In a typical ghc+packages installation, there are no Haskell sources. That
 makes life difficult for source-code-based tools, such as Haddock or HaRe
 (as far as I can see from `--show-iface` output, not even the import
 hierarchy is visible anymore?).

 (1) It would be useful if Ghc Api clients and Ghc users could easily find
 the matching source for installed packages, via a `src-dirs` field in the
 installed package description (if field is empty, no source has been
 installed).

 (2) It would be useful if matching sources could easily be added for
 installed packages. This would require editing the package description.
 Should there be an `edit` command for `ghc-pkg`?

 (3) An alternative to a `src-dirs` field would be to install sources in a
 separate source-package database, as long as it is easy to find the source
 from the binary package.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2630>
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