[GHC] #1141: Add extra completion functionality to readline package

[GHC]

#1141: Add extra completion functionality to readline package
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    Reporter:  judahj             |       Owner:         
        Type:  proposal           |      Status:  new    
    Priority:  normal             |   Milestone:  Not GHC
   Component:  libraries (other)  |     Version:  6.6    
    Severity:  normal             |    Keywords:         
  Difficulty:  Unknown            |    Testcase:         
Architecture:  Unknown            |          Os:  Unknown
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I propose adding a few functions having to do with readline word
 completion:

 The rl_completion_word_break_hook variable lets us control what characters
 readline considers as word boundaries during completion.  This function
 was added in readline version 5.0; we should not include this hook when
 compiling against earlier versions of the library.

 Additionally, we should allow get/set of the rl_attempted_completion_over
 variable.  If this variable is nonzero, readline won't use its default
 completer when our custom completer returns no results.

 These will be used to fix ghc bug #998.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1141>
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