deno/cli/rt/01_colors.js

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.

((window) => {
  function code(open, close) {
    return {
      open: `\x1b[${open}m`,
      close: `\x1b[${close}m`,
      regexp: new RegExp(`\\x1b\\[${close}m`, "g"),
    };
  }

  function run(str, code) {
    return !globalThis || !globalThis.Deno || globalThis.Deno.noColor
      ? str
      : `${code.open}${str.replace(code.regexp, code.open)}${code.close}`;
  }

  function bold(str) {
    return run(str, code(1, 22));
  }

  function italic(str) {
    return run(str, code(3, 23));
  }

  function yellow(str) {
    return run(str, code(33, 39));
  }

  function cyan(str) {
    return run(str, code(36, 39));
  }

  function red(str) {
    return run(str, code(31, 39));
  }

  function green(str) {
    return run(str, code(32, 39));
  }

  function bgRed(str) {
    return run(str, code(41, 49));
  }

  function white(str) {
    return run(str, code(37, 39));
  }

  function gray(str) {
    return run(str, code(90, 39));
  }

  function magenta(str) {
    return run(str, code(35, 39));
  }

  function dim(str) {
    return run(str, code(2, 22));
  }

  // https://github.com/chalk/ansi-regex/blob/2b56fb0c7a07108e5b54241e8faec160d393aedb/index.js
  const ANSI_PATTERN = new RegExp(
    [
      "[\\u001B\\u009B][[\\]()#;?]*(?:(?:(?:[a-zA-Z\\d]*(?:;[-a-zA-Z\\d\\/#&.:=?%@~_]*)*)?\\u0007)",
      "(?:(?:\\d{1,4}(?:;\\d{0,4})*)?[\\dA-PR-TZcf-ntqry=><~]))",
    ].join("|"),
    "g",
  );

  function stripColor(string) {
    return string.replace(ANSI_PATTERN, "");
  }

  window.__bootstrap.colors = {
    bold,
    italic,
    yellow,
    cyan,
    red,
    green,
    bgRed,
    white,
    gray,
    magenta,
    dim,
    stripColor,
  };
})(this);