[Twisted-Python] Embedding manhole interpreter into insults widget.

[Maxim Lacrima]

Hi,

Thanks for your explanation. Now I understand a lot better how things work.
I will try to implement "native" manhole widget. I think this will be a
good exercise for me to learn how terminals and `twisted.conch` work.

Thanks.


On 7 August 2014 14:53, <exarkun at twistedmatrix.com> wrote:

> On 6 Aug, 06:14 pm, lacrima.maxim at gmail.com wrote:
>
>> Hello,
>>
>> I have been trying to create a widget that encloses manhole interpreter.
>> Here is somewhat hacky implementation that I came up with at this moment:
>>
>
> Widgets and the manhole interpreter are implemented using two pretty
> distinct approaches.
>
> As you've figured out, these approaches can be integrated (at least in one
> direction) using a terminal emulator - `twisted.conch.insults.helper.
> TerminalBuffer`.
>
> However, `TerminalBuffer` is an extremely low quality terminal emulator.
> Among its many flaws is that it uses a number of incredibly inefficient
> implementations for common terminal operations (many of its other flaws are
> along the lines of "it has a bug in the implementation of X").
>
> If I were going to create a manhole widget then I would do it "natively" -
> not by bridging the existing manhole protocol to the widget system with
> TerminalBuffer but by writing a new widget that does manhole stuff all by
> itself.
>
> I suggest that you might want to pursue this approach instead of trying to
> optimize and fix bugs in TerminalBuffer.
>
> Ultimately it would be nice if a widget-based manhole were *the* manhole
> and the current implementation went away.
>
> However, that said, as far as I know, no vt-style terminals support
> efficient redrawing for the "vertically scroll one portion of the terminal
> separated from another portion by a vertical divider".
>
> You will be able to avoid the redundant work of re-rendering the Python
> buffer representing the terminal state but you'll still have to re-
> transmit the bytes representing the entire terminal display to the terminal
> on each redraw - unless you avoid vertical dividers.
>
> Jean-Paul
>
>
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-- 
Regards,
Maxim
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