[GHC] #10785: ghc-pkg appends colon to db path when piped/redirected

[GHC]

#10785: ghc-pkg appends colon to db path when piped/redirected
-------------------------------------+-------------------------------------
        Reporter:  jgertm            |                   Owner:  jgertm
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  ghc-pkg           |                 Version:  7.10.2
      Resolution:                    |                Keywords:  colon pipe
                                     |  redirect ghc-pkg list newcomer
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Changes (by thomie):

 * keywords:  colon pipe redirect ghc-pkg list => colon pipe redirect ghc-
     pkg list newcomer


Comment:

 That should be an easy fix for a newcomer.

 The function to change is `listPackages` in `utils/ghc-pkg/Main.hs`.

 Also test what happens on a broken package, and notice hidden packages are
 currently printed differently as well:
 {{{
 $ ghc-pkg list | grep ghc-7.10.2
 /opt/ghc/7.10.2/lib/ghc-7.10.2/package.conf.d:
     (ghc-7.10.2)
 }}}

 As a workaround, use: `ghc-pkg list --simple-output`.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10785#comment:1>
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