Function maybeDownload

sentiment/data.js:146–162

* Get a file by downloading it if necessary. * * @param {string} sourceURL URL to download the file from. * @param {string} destPath Destination file path on local filesystem.

(sourceURL, destPath)

 * @param {string} destPath Destination file path on local filesystem.
 */
async function maybeDownload(sourceURL, destPath) {
  return new Promise(async (resolve, reject) => {
    if (!fs.existsSync(destPath) || fs.lstatSync(destPath).size === 0) {
      const localZipFile = fs.createWriteStream(destPath);
      console.log(`Downloading file from ${sourceURL} ...`);
      https.get(sourceURL, response => {
        response.pipe(localZipFile);
        localZipFile.on('finish', () => {
          localZipFile.close(() => resolve());
        });
        localZipFile.on('error', err => reject(err));
      });
    } else {
      return resolve();
    }
  });
}

/**
 * Get extracted files.