Broken coloring for boolean in command prompt

[offchan42]

As you see in the image, the background color is broken after True keyword appears.
How do I get around this problem?

[gruns]

Thanks for the Issue!

In which terminal are you experiencing this behavior so I may attempt to
reproduce?

[offchan42]

@gruns It's the default windows 10 command prompt.
Try the following code:

from icecream import ic

ic(True)
print('hello')

[KyleKing]

I have the same issue on Windows where in, None, False, and True are highlighted along with any trailing output

[KyleKing]

I had a moment to troubleshoot this and created a minimal working example with a simplified formatted
The problem appears to be from colorama converting the ANSI escape sequences for Win32

from pygments import highlight
from pygments.formatters import Terminal256Formatter
from pygments.lexers import Python3Lexer as Py3Lexer
from pygments.style import Style
from pygments.token import (
    Text, Name, Error, Other, String, Number, Keyword, Generic, Literal,
    Comment, Operator, Whitespace, Punctuation)


# Solarized: https://ethanschoonover.com/solarized/
class MinSolarizedDark(Style):

    GREEN   = '#859900' # noqa

    styles = {
        Keyword:                GREEN,
        Keyword.Constant:       GREEN,
        Keyword.Declaration:    GREEN,
        Keyword.Reserved:       GREEN,
        Keyword.Type:           GREEN,
    }


lexer = Py3Lexer(ensurenl=False)
formatter = Terminal256Formatter(style=MinSolarizedDark)

import colorama
from colorama import Style as colorama_style
colorama.init()

code = {'this': None, 'that': True}
result = highlight(str(code), lexer, formatter)
print(result.encode())
print(result)
print('\n---\nstill white background' + colorama_style.RESET_ALL)
print('now cleared')

colorama.deinit()

print('\n---\n')
print(result)

Output:

Without the colorama.init()/colorama.deinit(), I don't have any issues with Windows command prompt or powershell
One easy solution might be to make colorama optional (or as an extra) and if the user installs colorama, they would have the win32 conversion, but it not, they wouldn't see the white background highlighting. I modified my local icecream.py in my .venv and seems to be working on my end

try:
    raise ImportError('HACK: Test if colorama were not installed')
    import colorama
except ImportError:
    colorama = None

@contextmanager
def supportTerminalColorsInWindows():
    # Filter and replace ANSI escape sequences on Windows with equivalent Win32
    # API calls. This code does nothing on non-Windows systems.
    if colorama:
        colorama.init()
    yield
    if colorama:
        colorama.deinit()

I'll add some notes to PR #40 later today/this weekend

Update: I started working on a simple fork: https://github.com/KyleKing/icecream (Will revisit if prepping a PR and not just commenting on #40) (Fork is now deleted)

Update 2: the quick fix of making colorama optional won't work. PyTest has a dependency on colorama, so colorama would likely be installed for most users. An alternative could be to make the colorma toggleable through an ic.configure argument, but still not ideal

Update 3: the above snippet should be useful to resume troubleshooting, but I wasn't able to resolve the issue in a meaningful way

[DavidLafond]

Same for me, after an "in" everything get a background colour. Anyways to fix that?

[alexmojaki]

Same problem is also mentioned in #52 (comment), clearly this is bothering a lot of people.

This seems to essentially be a colorama bug. I don't have Windows to test on but tartley/colorama#200 and tartley/colorama#218 sound like likely candidates. icecream doesn't actually specify any background colors at all, and @KyleKing's example shows nicely that just asking for a green foreground causes the grey background.

colorama is hardly maintained these days, see tartley/colorama#300 . Commits have slowed down and there are many open issues and PRs. The above issues are over 2 years old. icecream needs to not rely on colorama too much.

#40 would be helpful so that users can simply uninstall colorama to disable it.

You can disable color right now with #67 (comment) but as I said this needs to be easier and more obvious, something like ic.configureOutput(color=False) as mentioned in #31.

[rafaelruizv]

is there any update on this issue? this is very bothering... or at least any way to disable background color and keep the foreground color? This is issue is happening to me after the word "in" in windows VSCode

[gruns]

@rafaelruizv i dont have the time to tackle this right now, nor ready access to a windows machine to reproduce and debug

in the mean time, you can disable coloring by setting the outputFunction to just print to stderr print(..., file=sys.stderr)

import sys
from icecream import ic

ic.configureOutput(outputFunction=lambda *a: print(*a, file=sys.stderr))

this bypasses icecream's coloring functionality

[char101]

Colorama does not support 256 colors so escape code like \x1b[38;5;100m is interpreted as command m with 3 parameters: 38 (no match), 5 (no match), and 100 (this match colorama.ansi.AnsiBack.LIGHTBLACK_EX which is the gray background color you see).

So one way to deal with this issue is to add this code

colorama.ansi.AnsiBack.LIGHTBLACK_EX = 999

somewhere in your code.

Since Windows 10 terminal supports native 256 ansi colors (with registry hack or using ctypes), a better solution is

import icecream
icecream.ic.configureOutput(outputFunction=lambda s: print(icecream.colorize(s), file=sys.stderr))