Add rxvt color support

[KayLeung]

rxvt supports color: https://wiki.archlinux.org/index.php/rxvt-unicode#Colors

[sindresorhus]

What does echo $TERM output? Can you add a test? Like

supports-color/test.js

Lines 215 to 219 in d2e32f7

	test('support putty-256color', t => {
	process.env = {TERM: 'putty-256color'};
	const result = importFresh('.');
	t.is(result.level, 2);
	});

The text you linked to says that rxvt-unicode is compiled with colors by default, but that doesn't nessecarily mean all rxvt emulators are. Your regex seems a bit loose, unless you can confirm all versions supports colors.

[irfinnew]

+1 from another rxvt-unicode user.

$TERM is simply rxvt.

The text you linked to says that rxvt-unicode is compiled with colors by default, but that doesn't nessecarily mean all rxvt emulators are. Your regex seems a bit loose, [...]

That applies to pretty much every terminal in that regular expression ;)

Using screen does not imply that the terminal you're viewing screen in supports colors. xterm can be compiled without colors. There's no guarantee the Linux console has colors. So this regular expression is best-effort anyway. If certainty is important, then I suggest using termcap instead of $TERM sniffing.

Anyway, I've used rxvt and derivatives (aterm, Eterm, rxvt-unicode) for about 15 years, and I've never encountered an instance without color support. Meanwhile, NodeJS tools think my terminal can't do color, while it most certainly can.

[sindresorhus]

Alright. This still needs a test though.