Long standing annoying issue in ghci

[cheater00 cheater00]

I went ahead and did this for you.

On Tue, Dec 12, 2017 at 8:44 PM, cheater00 cheater00
<cheater00 at gmail.com> wrote:
> 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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