[GHC] #13743: Colourise command output

[GHC]

#13743: Colourise command output
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8809             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 In general I think we should be careful in how we approach colorization in
 the compiler. I fear that adding a bunch of special cases will easily
 snowball into an unmaintainable mess as more and more users try to get
 their favorite case into the tree. We are already beginning to see this
 with requests like #13718.

 I would much rather have a general mechanism for integrating with GHCi,
 allowing users to more easily extend and customize its functionality.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13743#comment:3>
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