[GHC] #2531: Prune duplicates in ghci history

[GHC]

#2531: Prune duplicates in ghci history
-------------------------------------+-------------------------------------
              Reporter:  venkat      |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:  7.10.1
              Priority:  lowest      |          Version:  6.8.3
             Component:  GHCi        |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  Documentation bug                  |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * cc: hvr (added)
 * failure:  None/Unknown => Documentation bug


Comment:

 Replying to [comment:7 vivian]:
 > You can add the following line to your `.haskeline` file:
 > {{{
 > > historyDuplicates IgnoreConsecutive
 > }}}
 > or `AlwaysAdd` or `IgnoreAll`.

 This could be added to the GHCi documentation.
 See also: http://trac.haskell.org/haskeline/wiki/UserPrefs

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2531#comment:14>
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