src/commands/helpers/github.js

import 'source-map-support/register';

import request from 'request';
import tar from 'tar';
import zlib from 'zlib';
import temp from 'temp';

// Automatically track and cleanup files at exit
temp.track();

/**
 * Fetches an array of all the tags for a Github repo, used as possible versions for a template.
 *
 * @param {string} packageName - A package name, expected to match "username/repo"
 *
 * @returns {object[]} - Array of tags/versions for the package
 */
export function getVersions(packageName) {
    if (!packageName) {
        throw new Error('No packageName was given.');
    }

    return new Promise((resolve, reject) => {
        request.get({
            url: `https://api.github.com/repos/${packageName}/tags`,
            headers: {
                'User-Agent': 'request'
            }
        }, (error, resp, body) => {
            if (error) {
                return reject(error);
            }

            if (resp.statusCode !== 200) {
                return reject(new Error(packageName + ': returned ' + resp.statusCode + '\n\nbody:\n' + body));
            }

            return resolve(JSON.parse(body));
        });
    });
}

/**
 * Fetches the tarball for a repository on Github.
 *
 * @param {string} packageName - A package name, expected to match "username/repo".
 * @param {string} [version="master"] The tag/version to fetch.
 *
 * @returns {string} The path to the temporary directory where the unarchived tarball is located.
 */
export function get(packageName, version = 'master') {
    if (!packageName) {
        throw new Error('No packageName was given.');
    }

    return new Promise((resolve, reject) => {
        temp.mkdir('roc', (err, dirPath) => {
            if (err) {
                return reject(err);
            }

            /* eslint-disable new-cap */
            const writeTar = tar.Extract({strip: 1, path: dirPath});
            /* eslint-enable */

            writeTar.on('finish', () => resolve(dirPath));

            request
                .get(`http://github.com/${packageName}/tarball/${version}`)
                .on('error', reject)
                .pipe(zlib.createGunzip())
                .on('error', reject)
                .pipe(writeTar)
                .on('error', reject);
        });
    });
}