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'use strict';
const os = require('os');
const hasFlag = require('has-flag');
const env = process.env;
let forceColor;
if (hasFlag('no-color') ||
hasFlag('no-colors') ||
hasFlag('color=false')) {
forceColor = false;
} else if (hasFlag('color') ||
hasFlag('colors') ||
hasFlag('color=true') ||
hasFlag('color=always')) {
forceColor = true;
}
if ('FORCE_COLOR' in env) {
forceColor = env.FORCE_COLOR.length === 0 || parseInt(env.FORCE_COLOR, 10) !== 0;
}
function translateLevel(level) {
if (level === 0) {
return false;
}
return {
level,
hasBasic: true,
has256: level >= 2,
has16m: level >= 3
};
}
function supportsColor(stream) {
if (forceColor === false) {
return 0;
}
if (hasFlag('color=16m') ||
hasFlag('color=full') ||
hasFlag('color=truecolor')) {
return 3;
}
if (hasFlag('color=256')) {
return 2;
}
if (stream && !stream.isTTY && forceColor !== true) {
return 0;
}
const min = forceColor ? 1 : 0;
if (process.platform === 'win32') {
// Node.js 7.5.0 is the first version of Node.js to include a patch to
// libuv that enables 256 color output on Windows. Anything earlier and it
// won't work. However, here we target Node.js 8 at minimum as it is an LTS
// release, and Node.js 7 is not. 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(process.versions.node.split('.')[0]) >= 8 &&
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'].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 = 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;
}
if (env.TERM === 'dumb') {
return min;
}
return min;
}
function getSupportLevel(stream) {
const level = supportsColor(stream);
return translateLevel(level);
}
module.exports = {
supportsColor: getSupportLevel,
stdout: getSupportLevel(process.stdout),
stderr: getSupportLevel(process.stderr)
};
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