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@twistedmatrix.com> wrote:
On 6 Aug, 06:14 pm, lacrima.maxim@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