index.js

'use strict';

var colors = require('ansi-colors');
var flatOpts = require('flat-options');
var log = require('fancy-log');
var nodemailer = require('nodemailer');
var path = require('path');
var through2 = require('through2');

module.exports = function (options) {
  options = flatOpts(options, {
    to: null,
    from: null,
    subject: null,
    html: null,
    text: null,
    smtp: null,
  });

  return through2.obj(function (file, enc, callback) {
    var transporter = nodemailer.createTransport('SMTP', options.smtp);

    if (file.isNull()) {
      this.push(file);
      return callback();
    }

    var to = options.to.constructor === Array ? options.to.join(',') : options.to;
    var subject = options.subject || path.basename(file.path);
    var html = options.html || file.contents.toString();
    var text = options.text || null;

    return transporter.sendMail(
      {
        from: options.from,
        to: to,
        subject: subject,
        generateTextFromHTML: true,
        html: html,
        text: text,
      },
      function (error, info) {
        if (error) {
          log.error(error);
        } else {
          log.info('Sent email', colors.cyan(subject), 'to', colors.red(to));
        }

        transporter.close();
        callback();
      }
    );
  });
};