QPlainTextEdit VT100 espace sequence support

Fuchsiaff

Hi, I am making a terminal widget with PyQt5 and I've come across several problems, one of them being that VT100 espace sequences show up like this

[0m[1;31m                          ./+o+-      [0m[1;31m bot[0m[1m@[0m[0m[1;31mbotnet[0m
[0m[1;37m                  yyyyy- [0m[1;31m-yyyyyy+     [0m[1;31m OS:[0m Ubuntu 18.10 cosmic[0m
[0m[1;37m               [0m[1;37m://+//////[0m[1;31m-yyyyyyo     [0m[1;31m Kernel:[0m x86_64 Linux 4.18.0-10-generic[0m
[0m[1;33m           .++ [0m[1;37m.:/++++++/-[0m[1;31m.+sss/`     [0m[1;31m Uptime:[0m 1d 15h 29m[0m
[0m[1;33m         .:++o:  [0m[1;37m/++++++++/:--:/-     [0m[1;31m Packages:[0m 2438[0m
[0m[1;33m        o:+o+:++.[0m[1;37m`..```.-/oo+++++/    [0m[1;31m Shell:[0m python3[0m
[0m[1;33m       .:+o:+o/.[0m[1;37m          `+sssoo+/   [0m[1;31m Resolution:[0m 1920x1080[0m
[0m[1;37m  .++/+:[0m[1;33m+oo+o:`[0m[1;37m             /sssooo.  [0m[1;31m DE:[0m KDE 5.50.0 / Plasma 5.13.5[0m
[0m[1;37m /+++//+:[0m[1;33m`oo+o[0m[1;37m               /::--:.  [0m[1;31m WM:[0m KWin[0m
[0m[1;37m \+/+o+++[0m[1;33m`o++o[0m[1;31m               ++////.  [0m[1;31m GTK Theme:[0m Breeze [GTK2/3][0m
[0m[1;37m  .++.o+[0m[1;33m++oo+:`[0m[1;31m             /dddhhh.  [0m[1;31m Icon Theme:[0m breeze[0m
[0m[1;33m       .+.o+oo:.[0m[1;31m          `oddhhhh+   [0m[1;31m Font:[0m Noto Sans Regular[0m
[0m[1;33m        \+.++o+o`[0m[1;31m`-````.:ohdhhhhh+    [0m[1;31m CPU:[0m Intel Core i7-4800MQ @ 8x 3.7GHz [51.0°C][0m
[0m[1;33m         `:o+++ [0m[1;31m`ohhhhhhhhyo++os:     [0m[1;31m GPU:[0m intel[0m
[0m[1;33m           .o:[0m[1;31m`.syhhhhhhh/[0m[1;33m.oo++o`     [0m[1;31m RAM:[0m 2116MiB / 7667MiB[0m
[0m[1;31m               /osyyyyyyo[0m[1;33m++ooo+++/    [0m
[0m[1;31m                   ````` [0m[1;33m+oo+++o\:    [0m
[0m[1;33m                          `oo++.      [0m

I want my qplaintextedit to show the sequences like the linux terminal shows them in the terminal. How do I do that?

aha_1980

@Fuchsiaff

You could have a look at a class that we use in QtCreator: http://code.qt.io/cgit/qt-creator/qt-creator.git/tree/src/libs/utils/ansiescapecodehandler.cpp

This class takes escape sequences and transforms them into a list of text with corresponding format.

Later, in http://code.qt.io/cgit/qt-creator/qt-creator.git/tree/src/libs/utils/outputformatter.cpp#n77 this list is appended to the plain text edit with means of QTextCursor()

This is of course no readymade solution, but should give you an idea how to do it.

Regards

JonB

@Fuchsiaff

I am making a terminal widget with PyQt5

Why? :)

Fuchsiaff

@JonB
I am creating an IDE in python (https://github.com/Fuchsiaff/pypad) and I need a good terminal widget to provide interactive mode support but I need a terminal for that and there weren't any terminal widgets for PyQt5 so I decided to write my own.
I still need to figure out how to interact with a process that's running but after I figure that out, my terminal should work just like a real terminal.

JonB

@Fuchsiaff
Qt offers QProcess to spawn sub-processes, and you can access their stdin/out/err. But if you mean an "attach to process" like a debugger, I think you'd have to look at platform-specific calls.

Fuchsiaff

Yeah, I am using QProcess but by interact with a running process I mean when you start a program using QProcess.start("python") then How do you write commands into that running process like in the cmd you write python and then you can write commands to the python shell

jsulm

@Fuchsiaff Did you read http://doc.qt.io/qt-5/qprocess.html ? Especially "Communicating via Channels" part?

Fuchsiaff

@jsulm Nope, haven't really dug deeper into the problem since I'm trying to figure out how to unescape the ansii color codes.

JonB

@Fuchsiaff
Just checking: you are sending the ESC character (ASCII 27) before the [ each time, aren't you?

I'm afraid there's no point asking me how/whether QPlainTextEdit handles these and whether it passes them through or not, I wouldn't know.

Roman Bober

@aha_1980 thank you!