app-sync/src/app-package.js

import Promise from "bluebird";
import { loadJson } from "./util";


/**
 * Retrieves the local [package.json] file.
 * @param id:         The ID of the remote package.
 * @param localFolder: The path to where the app it stored on the local disk.
 * @return {Promise}
 */
export const getLocalPackage = (id, localFolder) => {
    return new Promise((resolve, reject) => {
      loadJson(`${ localFolder }/package.json`)
        .then(file => resolve({ id, exists: file.exists, json: file.json }))
        .catch(err => reject(err));
    });
};



/**
 * Retrieves the remote [package.json] file.
 * @param id:         The ID of the remote package.
 * @param repo:       The repository to pull from.
 * @param subFolder:  The sub-folder into the repo (if there is one).
 * @param branch:     The branch to query.
 * @return {Promise}
 */
export const getRemotePackage = (id, repo, subFolder, branch) => {
    return new Promise((resolve, reject) => {
      repo.get(`${ subFolder }/package.json`, { branch })
        .then(result => {
            const file = result.files[0];
            if (file) {
              try {
                const json = JSON.parse(file.toString());
                resolve({ id, exists: true, json });
              } catch (err) { reject(err); }

            } else {
              resolve({ id, exists: false });
            }
        })
        .catch(err => reject(err));
    });
};