136 lines
2.7 KiB
Plaintext
136 lines
2.7 KiB
Plaintext
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'use strict';
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const os = require('os');
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const tty = require('tty');
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const hasFlag = require('has-flag');
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const {env} = process;
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let forceColor;
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if (hasFlag('no-color') ||
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hasFlag('no-colors') ||
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hasFlag('color=false') ||
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hasFlag('color=never')) {
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forceColor = 0;
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} else if (hasFlag('color') ||
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hasFlag('colors') ||
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hasFlag('color=true') ||
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hasFlag('color=always')) {
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forceColor = 1;
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}
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if ('FORCE_COLOR' in env) {
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if (env.FORCE_COLOR === 'true') {
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forceColor = 1;
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} else if (env.FORCE_COLOR === 'false') {
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forceColor = 0;
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} else {
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forceColor = env.FORCE_COLOR.length === 0 ? 1 : Math.min(parseInt(env.FORCE_COLOR, 10), 3);
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}
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}
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function translateLevel(level) {
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if (level === 0) {
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return false;
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}
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return {
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level,
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hasBasic: true,
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has256: level >= 2,
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has16m: level >= 3
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};
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}
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function supportsColor(haveStream, streamIsTTY) {
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if (forceColor === 0) {
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return 0;
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}
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if (hasFlag('color=16m') ||
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hasFlag('color=full') ||
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hasFlag('color=truecolor')) {
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return 3;
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}
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if (hasFlag('color=256')) {
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return 2;
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}
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if (haveStream && !streamIsTTY && forceColor === undefined) {
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return 0;
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}
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const min = forceColor || 0;
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if (env.TERM === 'dumb') {
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return min;
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}
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if (process.platform === 'win32') {
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// Windows 10 build 10586 is the first Windows release that supports 256 colors.
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// Windows 10 build 14931 is the first release that supports 16m/TrueColor.
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const osRelease = os.release().split('.');
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if (
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Number(osRelease[0]) >= 10 &&
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Number(osRelease[2]) >= 10586
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) {
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return Number(osRelease[2]) >= 14931 ? 3 : 2;
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}
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return 1;
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}
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if ('CI' in env) {
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if (['TRAVIS', 'CIRCLECI', 'APPVEYOR', 'GITLAB_CI', 'GITHUB_ACTIONS', 'BUILDKITE'].some(sign => sign in env) || env.CI_NAME === 'codeship') {
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return 1;
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}
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return min;
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}
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if ('TEAMCITY_VERSION' in env) {
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return /^(9\.(0*[1-9]\d*)\.|\d{2,}\.)/.test(env.TEAMCITY_VERSION) ? 1 : 0;
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}
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if (env.COLORTERM === 'truecolor') {
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return 3;
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}
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if ('TERM_PROGRAM' in env) {
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const version = parseInt((env.TERM_PROGRAM_VERSION || '').split('.')[0], 10);
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switch (env.TERM_PROGRAM) {
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case 'iTerm.app':
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return version >= 3 ? 3 : 2;
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case 'Apple_Terminal':
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return 2;
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// No default
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}
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}
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if (/-256(color)?$/i.test(env.TERM)) {
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return 2;
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}
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if (/^screen|^xterm|^vt100|^vt220|^rxvt|color|ansi|cygwin|linux/i.test(env.TERM)) {
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return 1;
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}
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if ('COLORTERM' in env) {
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return 1;
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}
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return min;
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}
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function getSupportLevel(stream) {
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const level = supportsColor(stream, stream && stream.isTTY);
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return translateLevel(level);
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}
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module.exports = {
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supportsColor: getSupportLevel,
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stdout: translateLevel(supportsColor(true, tty.isatty(1))),
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stderr: translateLevel(supportsColor(true, tty.isatty(2)))
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};
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