[Haskell-cafe] Re: [Haskell] ANN: ghci-haskeline 0.1

ChrisK haskell at list.mightyreason.com
Mon Jan 12 17:11:19 EST 2009

Haskeline is designed to remove the readline dependency, because Windows does 
not have readline.  So rlwrap is useless there.

Andrew Hunter wrote:
> On Mon, Jan 12, 2009 at 12:57:57PM -0800, Judah Jacobson wrote:
>> I'm pleased to announce the first release of ghci-haskeline.  This
>> package uses the GHC API to reimplement ghci with the Haskeline
>> library as a backend.  Haskeline is a library for line input in
>> command-line programs, similar to readline or editline, which is
>> written in Haskell and thus (hopefully) more easily integrated into
>> other Haskell programs.
> Perhaps this has already been discussed at length, in which case I
> apologize but, well, why provide line input editing at all?
> A number of languages/programs (off the top of my head: sml, most
> Schemes) don't; the standard method to get line editing is rlwrap.
> And this works (in my limited experience) quite well.  The
> disadvantage as I see it of using editline or Haskeline or whatever is
> that it's going to be sutbly different than other methods; presumably,
> people won't like the changes in behavior.
> It seems to me that from a UNIX-y separation of concern view, the
> right thing to do (as many languages have chosen) is to /not/ provide
> line editing, and just let the user do that with any number of
> convenient tools that focus on getting/that/ right (like rlwrap.)  Is
> there a reason we've not taken that approach?
> Thanks,

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