- progress on chalk deno

source/supports-color/browser.js

@@ -0,0 +1,25 @@
+/* eslint-env browser */
+
+function getChromeVersion() {
+	const matches = /(Chrome|Chromium)\/(?<chromeVersion>\d+)\./.exec(navigator.userAgent);
+
+	if (!matches) {
+		return;
+	}
+
+	return Number.parseInt(matches.groups.chromeVersion, 10);
+}
+
+const colorSupport = getChromeVersion() >= 69 ? {
+	level: 1,
+	hasBasic: true,
+	has256: false,
+	has16m: false
+} : false;
+
+const supportsColor = {
+	stdout: colorSupport,
+	stderr: colorSupport
+};
+
+export default supportsColor;

source/supports-color/index.js

@@ -0,0 +1,154 @@
+import hasFlag from '../has-flag/index.js';
+
+import { isatty } from "https://deno.land/std@0.94.0/node/tty.ts";
+
+const env = Deno.env.toObject();
+
+let flagForceColor;
+if (hasFlag('no-color') ||
+	hasFlag('no-colors') ||
+	hasFlag('color=false') ||
+	hasFlag('color=never')) {
+	flagForceColor = 0;
+} else if (hasFlag('color') ||
+	hasFlag('colors') ||
+	hasFlag('color=true') ||
+	hasFlag('color=always')) {
+	flagForceColor = 1;
+}
+
+function envForceColor() {
+	if ('FORCE_COLOR' in env) {
+		if (env.FORCE_COLOR === 'true') {
+			return 1;
+		}
+
+		if (env.FORCE_COLOR === 'false') {
+			return 0;
+		}
+
+		return env.FORCE_COLOR.length === 0 ? 1 : Math.min(Number.parseInt(env.FORCE_COLOR, 10), 3);
+	}
+}
+
+function translateLevel(level) {
+	if (level === 0) {
+		return false;
+	}
+
+	return {
+		level,
+		hasBasic: true,
+		has256: level >= 2,
+		has16m: level >= 3
+	};
+}
+
+function _supportsColor(haveStream, {streamIsTTY, sniffFlags = true} = {}) {
+	const noFlagForceColor = envForceColor();
+	if (noFlagForceColor !== undefined) {
+		flagForceColor = noFlagForceColor;
+	}
+
+	const forceColor = sniffFlags ? flagForceColor : noFlagForceColor;
+
+	if (forceColor === 0) {
+		return 0;
+	}
+
+	if (sniffFlags) {
+		if (hasFlag('color=16m') ||
+			hasFlag('color=full') ||
+			hasFlag('color=truecolor')) {
+			return 3;
+		}
+
+		if (hasFlag('color=256')) {
+			return 2;
+		}
+	}
+
+	if (haveStream && !streamIsTTY && forceColor === undefined) {
+		return 0;
+	}
+
+	const min = forceColor || 0;
+
+	if (env.TERM === 'dumb') {
+		return min;
+	}
+
+	if (Deno.build.os === 'win32') {
+		// TODO could not find how to get the OS release in Deno, the `Deno.osRelease()` (found in std/node/os) does not seem to work
+
+		// // Windows 10 build 10586 is the first Windows release that supports 256 colors.
+		// // Windows 10 build 14931 is the first release that supports 16m/TrueColor.
+		// const osRelease = os.release().split('.');
+		// if (
+		// 	Number(osRelease[0]) >= 10 &&
+		// 	Number(osRelease[2]) >= 10586
+		// ) {
+		// 	return Number(osRelease[2]) >= 14931 ? 3 : 2;
+		// }
+
+		return 1;
+	}
+
+	if ('CI' in env) {
+		if (['TRAVIS', 'CIRCLECI', 'APPVEYOR', 'GITLAB_CI', 'GITHUB_ACTIONS', 'BUILDKITE', 'DRONE'].some(sign => sign in env) || env.CI_NAME === 'codeship') {
+			return 1;
+		}
+
+		return min;
+	}
+
+	if ('TEAMCITY_VERSION' in env) {
+		return /^(9\.(0*[1-9]\d*)\.|\d{2,}\.)/.test(env.TEAMCITY_VERSION) ? 1 : 0;
+	}
+
+	if (env.COLORTERM === 'truecolor') {
+		return 3;
+	}
+
+	if ('TERM_PROGRAM' in env) {
+		const version = Number.parseInt((env.TERM_PROGRAM_VERSION || '').split('.')[0], 10);
+
+		switch (env.TERM_PROGRAM) {
+			case 'iTerm.app':
+				return version >= 3 ? 3 : 2;
+			case 'Apple_Terminal':
+				return 2;
+			// No default
+		}
+	}
+
+	if (/-256(color)?$/i.test(env.TERM)) {
+		return 2;
+	}
+
+	if (/^screen|^xterm|^vt100|^vt220|^rxvt|color|ansi|cygwin|linux/i.test(env.TERM)) {
+		return 1;
+	}
+
+	if ('COLORTERM' in env) {
+		return 1;
+	}
+
+	return min;
+}
+
+export function createSupportsColor(stream, options = {}) {
+	const level = _supportsColor(stream, {
+		streamIsTTY: stream && stream.isTTY,
+		...options
+	});
+
+	return translateLevel(level);
+}
+
+const supportsColor = {
+	stdout: createSupportsColor({isTTY: isatty(1)}),
+	stderr: createSupportsColor({isTTY: isatty(2)})
+};
+
+export default supportsColor;