Pylint does not escape strings before outputting them in messages

[GideonBear]

Bug description

var == '\n'

I confirmed this happens in magic-value, but I don't know if there are other errors that this can apply to.
Maybe it should use repr instead of str for representing values?
This also happens with other characters:

• '\r': '. (magic-value-comparison) R2004: Consider using a named constant or an enum instead of '
• Any color code (for example '\033[92m'): Everything after instead of ' is colored green

Configuration

[MAIN]
load-plugins=pylint.extensions.magic_value

Command used

pylint a.py

Pylint output

R2004: Consider using a named constant or an enum instead of '
'. (magic-value-comparison)

Expected behavior

R2004: Consider using a named constant or an enum instead of '\n'. (magic-value-comparison)

Pylint version

pylint 2.16.0-dev
astroid 2.12.13
Python 3.9.15 (main, Nov 11 2022, 13:33:56) 
[GCC 9.4.0]

OS / Environment

No response

Additional dependencies

No response

[clavedeluna]

Can reproduce!

[GideonBear]

https://github.com/PyCQA/pylint/blob/8c789cc9184f880bdd282ea877c8ee932c7bfe28/pylint/extensions/magic_value.py#L65-L75
What's the best way to handle this? Should it just use repr?

[Pierre-Sassoulas]

Probably with left_operand.as_string() and right_operand.as_string().

[GideonBear]

Are there more checkers where this needs to be fixed?

[Pierre-Sassoulas]

Not sure; but possibly as we're trying more and more to add code suggestions in messages.