Long standing annoying issue in ghci

[cheater00 cheater00]

Yes, it is worth doing it, because until Haskeline has been fixed and
integrated into ghci, the issue persists and needs to remain filed.

On Fri, 8 Dec 2017 18:25 MarLinn, <monkleyon at gmail.com> wrote:

> I opened an issue on the Haskeline github (
> https://github.com/judah/haskeline/issues/72).
>
> But it seems to be completely Haskeline-side, so I'm not sure if it's
> worth re-opening the one for ghci? As missing documentation maybe?
> (BTW, I found this on the wiki: https://wiki.haskell.org/GHCi_in_colour.
> Might be a good place to put it, if linked.)
>
> If you want to, here are my test cases rewritten as ghci prompts:
>
>     -- single line, positioning error
>     :set prompt " \ESC[36m%\ESC[0m "
>     -- single line, works
>     :set prompt " \ESC[36m\STX%\ESC[0m\STX "
>     -- multiline, bad output
>     :set prompt "\ESC[32m\STX–––\ESC[0m\STX\n \ESC[36m\STX%\ESC[0m\STX "
>     -- multiline, works but is inconsistent
>     :set prompt "\ESC[32m–––\ESC[0m\n \ESC[36m\STX%\ESC[0m\STX "
>
> In my tests, the positioning errors consistently happen if there are any
> "unclosed" escape-sequences on the last line of the prompt, regardless of
> its length. Escape sequences on previous lines consistently create "weird
> characters", but don't influence the positioning. Also regardless of their
> lengths. That makes sense, as both sets of lines seem to be handled quite
> differently.
>
> Are multiline prompts even used by a lot of people? I like mine because it
> gives me a both a list of modules and a consistent cursor position. But
> maybe I'm the exception?
>
> Cheers.
>
>
> On 2017-12-07 23:15, cheater00 cheater00 wrote:
>
> Interesting. Would you mind reopening the issue and providing a buggy
> example? Amd alerting haskeline maintainers? How does it work on a 1 line
> prompt that is so long it wraps?
>
> On Thu, 7 Dec 2017 23:11 MarLinn, <monkleyon at gmail.com> wrote:
>
>>
>> > Here's what I use:
>> >
>> > :set prompt "\ESC[46m\STX%s>\ESC[39;49m\STX "
>> >
>> > I believe \STX is a signal to haskeline for control sequences.
>> > Documentation is here:
>> > https://github.com/judah/haskeline/wiki/ControlSequencesInPrompt
>> Note: If you're using a multi-line prompt, things may be different
>> again. I don't know what the rules are, but I found that if I put \STX
>> on any but the last line of prompts I get weird characters. The same
>> goes for any \SOH you might want to add for some reason.
>>
>> Cheers,
>> MarLinn
>>
>>
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