How to use colors - 10 common examples

function runTest(test) {
  var batchFile = path.join(test.path, 'run.batch');

  if (!fs.existsSync(batchFile)) {
    runNextTest();
    return; // this folder is not a test folder;
  }

  var txt = (fs.readFileSync(batchFile) + '');
  txt = applyChanges(txt);

  console.log(colors.bold('running'), txt);
  rimraf.sync(test.path);

  try {
    execSync(`git checkout ${test.path} && cd ${test.path} && ${txt}`, {stdio:[0,1,2]});
    totals.success++;
    console.log(' -', colors.bold('pass'), currentTest.name);
  } catch(err) {
    totals.fail++;
    console.log(' -', colors.bold('failed'), currentTest.name);
    console.error(err.message);
    process.exit(1);
  }
  runNextTest();
}

const fetcher = new SubmoduleFetcher(repo, head);

    const subName = paths[0];
    const opener = new Open.Opener(repo, null);
    const subRepo = yield opener.getSubrepo(subName, 
                                            Open.SUB_OPEN_OPTION.FORCE_OPEN);
    const metaCommit = yield repo.getCommit(metaAnnotated.id());

    // Now that we have an open submodule, we can attempt to resolve
    // `subCommittish`.

    const subAnnotated = yield GitUtil.resolveCommitish(subRepo,
                                                        subCommittish);
    if (null === subAnnotated) {
        throw new UserError(`\
Could not find ${colors.red(subCommittish)} in ${colors.blue(subName)}.\
`);
    }

    // This command could take a while; let the user know exactly what we're
    // doing.

    console.log(`\
Searching for ${colors.green(GitUtil.shortSha(subAnnotated.id().tostrS()))} \
from submodule ${colors.blue(subName)}, starting at \
${colors.green(GitUtil.shortSha(metaAnnotated.id().tostrS()))} in the \
meta-repo.`);

    const subCommit = yield subRepo.getCommit(subAnnotated.id());

    // Finally, we do the search.

const verifyExtensiveTools = () => {
  // verify rnpm exists
  if (!Shell.which('rnpm')) {
    console.log(colors.red('This script requires rnpm to be installed.'))
    console.log(colors.green('Installing rnpm...'))
    Shell.exec('npm i -g rnpm')
  // Enforce latest rnpm -> line count of npm outdated should be zero
  } else if (!Shell.exec('npm outdated -g rnpm | wc -l | grep 0')) {
    console.log(colors.red('We depend on an updated rnpm.'))
    console.log(colors.yellow('Please update with ') + colors.green('npm i -g rnpm'))
    console.log(colors.red('Exiting!'))
    Shell.exit(1)
  }
}

main().catch(e => {
  // tslint:disable-next-line:no-console
  console.error(colors.red(e));
  process.exit(1);
});

function describeGate(gate, formatRadix, formatStringLengh, columns) {
  const {run} = options;

  const GateClass = loadGate(gate);
  const isBuiltIn = Object.getPrototypeOf(GateClass) === BuiltInGate;
  const isKeyboard = isBuiltIn && GateClass.name === 'Keyboard';
  const spec = GateClass.Spec;

  console.info('');
  console.info(
    (isBuiltIn ? 'BuiltIn ' : 'Custom ') +
      colors.bold(`"${GateClass.name}"`) +
      ' gate:'
  );

  const toFullName = name => {
    const isSimple = typeof name === 'string' || name.size === 1;
    return (name = isSimple
      ? `  - ${name.name || name}`
      : `  - ${name.name}[${name.size}]`);
  };

  // Description:

  const description = spec.description
    .split('\n')
    .map(line => '  ' + line)
    .join('\n');

return callback(true);
        }
    }else{
        //if(!/^.*(\.({|{[a-zA-Z,]*,)|\.)(svg)(,[,a-zA-Z]*}|}|)$/gi.test(input)){
        //  console.log(colors.red(" You didn't turn on [enginesvg], but your input path includes the 'svg' extension;  either delete the extension 'svg' from path, or turn on [enginesvg: ['svgo'] or other]. Alternatively, your input path may be malformed!: Examples: src/img/**/*.{jpg,JPG,jpeg,JPEG,svg} or src/img/**/*.svg or src/img/*.svg ..."));
        //  console.log(colors.red(' Input path: ')+colors.magenta(input));
        //  return callback(true);
        //}      
    }
    

    //GIF
    if(false == enginegif.gif.engine){
        if(/^.*(\.({|{[a-zA-Z,]*,)|\.)(gif)(,[,a-zA-Z]*}|}|)$/gi.test(input)){
          console.log(colors.red(" You didn't turn on [enginegif], but your input path includes the 'gif' extension; either delete the extension 'gif' from the input path, or turn on [enginegif: ['gifsicle'] or other]. Alternatively, your input path may be malformed!: Examples: src/img/**/*.{jpg,JPG,jpeg,JPEG,gif} or src/img/**/*.gif or src/img/*.gif ..."));
          console.log(colors.red(' Input path: ')+colors.magenta(input));
          return callback(true);
        }
    }else{
        //if(!/^.*(\.({|{[a-zA-Z,]*,)|\.)(gif)(,[,a-zA-Z]*}|}|)$/gi.test(input)){
        //  console.log(colors.red(" You didn't turn on [enginegif], but your input path includes the 'gif' extension;  either delete the extension 'gif' from path, or turn on [enginegif: ['gifsicle'] or other]. Alternatively, your input path may be malformed!: Examples: src/img/**/*.{jpg,JPG,jpeg,JPEG,gif} or src/img/**/*.gif or src/img/*.gif ..."));
        //  console.log(colors.red(' Input path: ')+colors.magenta(input));
        //  return callback(true);
        //}      
    }

if(returnMain === 'finished2') {
    console.clear();
    console.log();
    console.log(colors.blue.bold('mStream Configuration Wizard'));
    console.log(colors.magenta('Config Not Saved!'));
    console.log();
    process.exit();
  }

  // Save
  fs.writeFileSync( filepath, JSON.stringify(loadJson,  null, 2), 'utf8');
  console.clear();
  console.log();
  console.log(colors.blue.bold('mStream Configuration Wizard'));
  console.log(colors.magenta('Config Saved!'));
  console.log();
  console.log(colors.bold('You can start mStream by running the command:'));
  console.log(`mstream -j ${filepath}`);
  console.log();
}

let color;
            results.push(validatorTask.result);
            result = this.mergeValidationResults(results);
            color =
                result.type === 0 /* missing */
                    ? colors.red
                    : result.type === 2 /* installed */
                        ? colors.green
                        : colors.yellow;
            // console.log(this.androidSdk.latestVersion.AndroidSdkVersion.sdkLevel)
            messageResult += `${color(`\n${result.leadingBox} ${validator.title}\n`)}`;
            // console.log(`${result.leadingBox} ${validator.title} is`)
            for (let message of result.messages) {
                const text = message.message.replace('\n', '\n      ');
                if (message.isError) {
                    messageResult += `${colors.red(`    ✗  ${text}`)}\n`;
                    // console.log(`    ✗  ${text}`);
                }
                else if (message.isWaring) {
                    messageResult += `${colors.yellow(`    !  ${text}`)}\n`;
                    // console.log(`    !  ${text}`);
                }
                else {
                    messageResult += `    •  ${text}\n`;
                    // console.log(`    •  ${text}`);
                }
            }
        }
        return messageResult;
    }
    mergeValidationResults(results) {

function execScript(script, {verbose = false} = {}) {
  try {
    new ScriptInterpreter({
      file: script,
      workingDirectory: path.dirname(script),
    }).exec();

    if (verbose) {
      console.info(colors.green('\n\u2713 Script executed successfully!\n'));
    } else {
      console.info(colors.green('[PASS]'), path.basename(script));
    }
  } catch (e) {
    if (!verbose) {
      console.info(colors.red('[FAIL]'), path.basename(script));
      return;
    }

    if (!e.errorData) {
      console.info(`Script error:`, e);
      return;
    }

    const {header, errorList, compareTo} = e.errorData;

    console.info(colors.red('\nError executing the script:\n'));

    const pad2 = '  ';
    const pad4 = '    ';

    // Find Max line number

const headers = {
      'content-type': 'application/octet-stream',
      'x-fc-request-id': requestId,
      'x-fc-invocation-duration': billedTime,
      'x-fc-invocation-service-version': 'LATEST',
      'x-fc-max-memory-usage': memoryUsage,
      'access-control-expose-headers': 'Date,x-fc-request-id,x-fc-error-type,x-fc-code-checksum,x-fc-invocation-duration,x-fc-max-memory-usage,x-fc-log-result,x-fc-invocation-code-version'
    };

    res.status(statusCode);

    // todo: fix body 后面多个换行的 bug
    if (errorResponse) { // process HandledInvocationError and UnhandledInvocationError
      headers['content-type'] = 'application/json';

      console.error(red(errorResponse));

      if (body.toString()) {
        headers['x-fc-error-type'] = 'HandledInvocationError';
      } else {
        headers['x-fc-error-type'] = 'UnhandledInvocationError';
        body = {
          'errorMessage': `Process exited unexpectedly before completing request (duration: ${billedTime}ms, maxMemoryUsage: ${memoryUsage}MB)`
        };
      }
    }

    res.set(headers);
    res.send(body);
  }
}