lib.js

var GitHubApi = require('@octokit/rest');
var fs = require('fs');

var github = (exports.github = new GitHubApi({
  debug: false,
  headers: { 'Accept-Charset': 'ISO-8859-1,utf-8' }
}));

/*
  Write out content of README.md file for latest release of org/module to path.
*/
exports.processReadme = function(targetRepo, path) {
  var options = {};
  var fileName = path + '/' + targetRepo.repoName + '.md';
  options.owner = targetRepo.org;
  options.repo = targetRepo.repoName;

  if (targetRepo.branch) {
    // get readme for branch, if specified
    options.ref = targetRepo.branch;
    path = path + '/' + targetRepo.repoName + '-' + targetRepo.branch + '.md';
    writeOutReadme(options, path);
  } else {
    github.repos.getLatestRelease(
      { owner: targetRepo.org, repo: targetRepo.repoName },
      function(err, res) {
        if (err) {
          // Use master release
          //console.log('For ' + targetRepo.org + '/' + targetRepo.repoName +
          // ' -- No latest release ');
        } else {
          // Use latest tagged release if it exists
          // console.log('For ' + targetRepo.org + '/' + targetRepo.repoName  +
          // ' latest release is ' + res.data.tag_name );
          options.ref = res.data.tag_name;
        }
        writeOutReadme(options, fileName);
      }
    );
  }
}; //processReadme

/**
 *  Saves the README file to the specified directory path.
 *  @param {Object} options options passed to
 *   [getReadme](http://mikedeboer.github.io/node-github/#api-repos-getReadme):
 * options.owner, options.repo, and options.ref are used.
 * @param {String} readmeFile Full directory path and file name where the
 * README will be written.
 */
function writeOutReadme(options, readmeFile) {
  github.repos.getReadme(options, function(err, res) {
    if (err) {
      console.error('Fail to fetch README from github', err);
    } else {
      console.log('Writing ' + readmeFile);
      //var file = path + '/' + options.repo + '.md'
      var s = new Buffer(res.content, 'base64').toString();
      //var fs = require('fs');
      fs.writeFile(readmeFile, s, function(err) {
        if (err) {
          return console.error(err);
        }
      });
    }
  });
}

/**
 *  Check whether a file or directory exists.
 * @param {String} path Path to the file or directory.
 * @param {Boolean} isDir True if testing existence of a directory.
 * False or don't supply otherwise.
 */
exports.fileOrDirExists = function(path, isDir) {
  try {
    if (isDir) {
      return fs.statSync(path).isDirectory();
    } else {
      return fs.statSync(path).isFile();
    }
  } catch (e) {
    if (e.code === 'ENOENT') {
      console.error(path + ': Does not exist.');
      return false;
    } else {
      throw e;
    }
  }
};