NO_COLOR precedence

[bluss]

This document https://bixense.com/clicolors/ says that NO_COLOR has precedence over CLICOLOR_FORCE, but the AutoStream implementation is the other way around.

[epage]

The implementation was made before those specs were merged so I had to take a guess.

[epage]

Hmm, they've made breaking changes to the spec, changing from value checks to presence checks. I strongly disagree with what they've changed it to but not really much to be done.

[epage]

Compare

def has_colors():
    if ((os.getenv("CLICOLOR", "1") != "0" and sys.stdout.isatty()) or
        os.getenv("CLICOLOR_FORCE", "0") != "0"):
        return True
    else:
        return False

with

def has_colors():
    if "NO_COLOR" in os.environ:
        return False
    if "CLICOLOR_FORCE" in os.environ:
        return True
    return sys.stdout.isatty()

[bluss]

I don't have much of an opinion here, and I didn't know those specs 30 minutes ago - so no need to listen to me. I looked at them because they are linked in rustdoc. Now we know that there is this discrepancy.