[6a3a178] | 1 | 'use strict';
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| 2 | const os = require('os');
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| 3 | const hasFlag = require('has-flag');
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| 4 |
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| 5 | const env = process.env;
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| 6 |
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| 7 | let forceColor;
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| 8 | if (hasFlag('no-color') ||
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| 9 | hasFlag('no-colors') ||
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| 10 | hasFlag('color=false')) {
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| 11 | forceColor = false;
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| 12 | } else if (hasFlag('color') ||
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| 13 | hasFlag('colors') ||
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| 14 | hasFlag('color=true') ||
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| 15 | hasFlag('color=always')) {
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| 16 | forceColor = true;
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| 17 | }
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| 18 | if ('FORCE_COLOR' in env) {
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| 19 | forceColor = env.FORCE_COLOR.length === 0 || parseInt(env.FORCE_COLOR, 10) !== 0;
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| 20 | }
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| 21 |
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| 22 | function translateLevel(level) {
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| 23 | if (level === 0) {
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| 24 | return false;
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| 25 | }
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| 26 |
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| 27 | return {
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| 28 | level,
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| 29 | hasBasic: true,
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| 30 | has256: level >= 2,
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| 31 | has16m: level >= 3
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| 32 | };
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| 33 | }
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| 34 |
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| 35 | function supportsColor(stream) {
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| 36 | if (forceColor === false) {
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| 37 | return 0;
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| 38 | }
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| 39 |
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| 40 | if (hasFlag('color=16m') ||
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| 41 | hasFlag('color=full') ||
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| 42 | hasFlag('color=truecolor')) {
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| 43 | return 3;
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| 44 | }
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| 45 |
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| 46 | if (hasFlag('color=256')) {
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| 47 | return 2;
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| 48 | }
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| 49 |
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| 50 | if (stream && !stream.isTTY && forceColor !== true) {
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| 51 | return 0;
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| 52 | }
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| 53 |
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| 54 | const min = forceColor ? 1 : 0;
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| 55 |
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| 56 | if (process.platform === 'win32') {
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| 57 | // Node.js 7.5.0 is the first version of Node.js to include a patch to
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| 58 | // libuv that enables 256 color output on Windows. Anything earlier and it
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| 59 | // won't work. However, here we target Node.js 8 at minimum as it is an LTS
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| 60 | // release, and Node.js 7 is not. Windows 10 build 10586 is the first Windows
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| 61 | // release that supports 256 colors. Windows 10 build 14931 is the first release
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| 62 | // that supports 16m/TrueColor.
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| 63 | const osRelease = os.release().split('.');
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| 64 | if (
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| 65 | Number(process.versions.node.split('.')[0]) >= 8 &&
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| 66 | Number(osRelease[0]) >= 10 &&
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| 67 | Number(osRelease[2]) >= 10586
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| 68 | ) {
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| 69 | return Number(osRelease[2]) >= 14931 ? 3 : 2;
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| 70 | }
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| 71 |
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| 72 | return 1;
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| 73 | }
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| 74 |
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| 75 | if ('CI' in env) {
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| 76 | if (['TRAVIS', 'CIRCLECI', 'APPVEYOR', 'GITLAB_CI'].some(sign => sign in env) || env.CI_NAME === 'codeship') {
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| 77 | return 1;
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| 78 | }
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| 79 |
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| 80 | return min;
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| 81 | }
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| 82 |
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| 83 | if ('TEAMCITY_VERSION' in env) {
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| 84 | return /^(9\.(0*[1-9]\d*)\.|\d{2,}\.)/.test(env.TEAMCITY_VERSION) ? 1 : 0;
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| 85 | }
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| 86 |
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| 87 | if (env.COLORTERM === 'truecolor') {
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| 88 | return 3;
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| 89 | }
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| 90 |
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| 91 | if ('TERM_PROGRAM' in env) {
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| 92 | const version = parseInt((env.TERM_PROGRAM_VERSION || '').split('.')[0], 10);
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| 93 |
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| 94 | switch (env.TERM_PROGRAM) {
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| 95 | case 'iTerm.app':
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| 96 | return version >= 3 ? 3 : 2;
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| 97 | case 'Apple_Terminal':
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| 98 | return 2;
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| 99 | // No default
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| 100 | }
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| 101 | }
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| 102 |
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| 103 | if (/-256(color)?$/i.test(env.TERM)) {
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| 104 | return 2;
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| 105 | }
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| 106 |
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| 107 | if (/^screen|^xterm|^vt100|^vt220|^rxvt|color|ansi|cygwin|linux/i.test(env.TERM)) {
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| 108 | return 1;
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| 109 | }
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| 110 |
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| 111 | if ('COLORTERM' in env) {
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| 112 | return 1;
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| 113 | }
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| 114 |
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| 115 | if (env.TERM === 'dumb') {
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| 116 | return min;
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| 117 | }
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| 118 |
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| 119 | return min;
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| 120 | }
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| 121 |
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| 122 | function getSupportLevel(stream) {
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| 123 | const level = supportsColor(stream);
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| 124 | return translateLevel(level);
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| 125 | }
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| 126 |
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| 127 | module.exports = {
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| 128 | supportsColor: getSupportLevel,
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| 129 | stdout: getSupportLevel(process.stdout),
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| 130 | stderr: getSupportLevel(process.stderr)
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| 131 | };
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