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Right now it is very difficult to determine if a terminal supports colors or not. This function adds this functionality by detecting environment variables and checking process. PR-URL: nodejs#17615 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
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Original file line number | Diff line number | Diff line change |
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'use strict'; | ||
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const common = require('../common'); | ||
const assert = require('assert').strict; | ||
/* eslint-disable no-restricted-properties */ | ||
const { openSync } = require('fs'); | ||
const tty = require('tty'); | ||
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const { WriteStream } = require('tty'); | ||
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// Do our best to grab a tty fd. | ||
function getTTYfd() { | ||
const ttyFd = [0, 1, 2, 4, 5].find(tty.isatty); | ||
if (ttyFd === undefined) { | ||
try { | ||
return openSync('/dev/tty'); | ||
} catch (e) { | ||
// There aren't any tty fd's available to use. | ||
return -1; | ||
} | ||
} | ||
return ttyFd; | ||
} | ||
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const fd = getTTYfd(); | ||
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// Give up if we did not find a tty | ||
if (fd === -1) | ||
common.skip(); | ||
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const writeStream = new WriteStream(fd); | ||
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let depth = writeStream.getColorDepth(); | ||
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assert.equal(typeof depth, 'number'); | ||
assert(depth >= 1 && depth <= 24); | ||
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// If the terminal does not support colors, skip the rest | ||
if (depth === 1) | ||
common.skip(); | ||
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assert.notEqual(writeStream.getColorDepth({ TERM: 'dumb' }), depth); | ||
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// Deactivate colors | ||
const tmp = process.env.NODE_DISABLE_COLORS; | ||
process.env.NODE_DISABLE_COLORS = 1; | ||
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depth = writeStream.getColorDepth(); | ||
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assert.equal(depth, 1); | ||
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process.env.NODE_DISABLE_COLORS = tmp; |