[GHC] #10989: :ctags and :etags command can receive haskell source files as a parameter

[GHC]

#10989: :ctags and :etags command can receive haskell source files as a parameter
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        Reporter:  hugomg            |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  GHCi              |              Version:  7.10.2
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by thomie):

 * keywords:   => newcomer
 * milestone:   => 8.0.1


Comment:

 This sounds like a nice task for a newcomer:

 * Update the documentation as mentioned.
 * Change the function `collateAndWriteTags` in `ghc/GhciTags.hs` to not
 overwrite existing source files.
 * Add one or multiple tests in `testsuite/tests/ghci/scripts/`, see
 [wiki:Building/RunningTests/Adding].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10989#comment:1>
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