[Hackage] #235: cabal list should also list installed packages

[Hackage]

#235: cabal list should also list installed packages
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  Reporter:  duncan              |        Owner:         
      Type:  enhancement         |       Status:  new    
  Priority:  normal              |    Milestone:         
 Component:  cabal-install tool  |      Version:  1.2.3.0
  Severity:  normal              |     Keywords:         
Difficulty:  easy (<4 hours)     |   Ghcversion:  6.8.2  
  Platform:                      |  
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 Currently `cabal list foo` only looks at the available packages and not at
 the installed ones.

 The `cabal list` command output needs improving. It currently lists all
 available versions of available (but not installed) packages. That's both
 too much and too little info. We want to know for each matching package
 the installed versions and we probably do not need to know every single
 available version.

 There are already `RepoIndex` and `LocalIndex` types for doing lookups so
 this task is just to format the information nicely. See the `Hackage.List`
 module in `cabal-install`.

 For reference you might like to look at what other similar tools do. For
 example Gentoo's `esearch` utility gives us:

 {{{
 $ esearch xmonad
 [ Results for search key : xmonad ]
 [ Applications found : 2 ]

 *  x11-wm/xmonad
       Latest version available: 0.5-r1
       Latest version installed: 0.5
       Size of downloaded files: [no/bad digest]
       Homepage:    http://www.xmonad.org/
       Description: A lightweight X11 window manager
       License:     BSD

 *  x11-wm/xmonad-contrib
       Latest version available: 0.5-r1
       Latest version installed: [ Not Installed ]
       Size of downloaded files: [no/bad digest]
       Homepage:    http://www.xmonad.org/
       Description: Third party extentions for xmonad
       License:     BSD
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/235>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects