[Haskell-cafe] hacking ghci

Dan Mead d.w.mead at gmail.com
Mon Jan 8 01:35:07 EST 2007

a carrot indicator like java does would also be a nice addition.

On 1/8/07, Walter Moreira <gwallter at gmail.com> wrote:
> Hi Haskellers. A short while ago I asked about the possibility to have
> the output of ghci in color.  Thanks to Donald Stewart who set up a
> wiki page to continue the attempt. Other people suggested HsColour and
> GUI's (thanks too). I'm not so interested in highlighting the snippets
> of code which ghci displays, but to use different colors for the
> different types of output: different colors for the prompt, input,
> warnings, exceptions, normal output, etc.
> Are any of these ideas viable?:
> 1. Hack the code of Interactive.hs in the GHC distribution and
>    substitute the calls to 'putStr[Ln]' by some thin wrapper which can
>    write with colors, according to a command line option (--color or
>    --colour, for example), maybe using HsColour. This looks easy
>    enough and I'd be willing to do it, but it's intrusive, and one has
>    to mantain a different version of ghci in parallel with the main
>    ghci.
> 2. Use GHC as library (from 6.6 on) and write a similar application as
>    ghci, with more emphasis in the 'interactive' part of the name (in
>    the same way as the relation between Python and the IPython
>    extended shell). This is more work and more duplicate efforts, but
>    it may be worthly, perhaps.
> 3. Write a wrapper which communicates with ghci via pipes. I read some
>    attempts about this somewhere, and people suggested an approach as
>    in #2.
> I haven't mentioned the GUI applications, since I would like to just
> have something in the spirit of ghci (command line oriented), but with
> colors or with configurable output.  Which approach do you people
> think it is best?
> Sorry for the long message. Cheers,
> Walter
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