Google Apps Script to bulk-import Gmail messages into Evernote.

evernote-gmail-bulk-import.js

/**
 * For every thread with the `Evernote` label:
 * - Forward each message in the thread to your Evernote email address
 * - Remove the Evernote label
 * 
 * TODO: Figure out a way to trigger this script when a new thread is tagged, right now I run it manually.
 */

/**
 * Your evernote Gmail label. Where the emails will be pulled from.
 */
EVERNOTE_LABEL = 'Evernote';

/**
 * Your evernote email address. Where the emails be forwarded to.
 */
EVERNOTE_IMPORT_EMAIL = 'something@m.evernote.com';

/**
 *
 * Return an Evernote formated subject.
 *
 * Appends the the thread's labels to the messages's
 * subject. Each thread is appended as a hash tag.
 *
 */
function getSubject(thread, message) {
  var labels = thread.getLabels()

  labels = labels.map(function(label) {
    return '#' + label.getName().toLowerCase();
  }).join(' ');

  return message.getSubject() + ' ' + labels;
};

/**
 *
 * Forward each method in the thread to the Evernote
 * email address.
 *
 */
function handleThread(thread) {
  Logger.log('Forwarding: %s', thread.getFirstMessageSubject());

  var messages = thread.getMessages();
  for (var j = 0; j < messages.length; j++) {
    var message = messages[j];
    var emailOptions = {
      subject: getSubject(thread, message)
    };

    message.forward(EVERNOTE_IMPORT_EMAIL, emailOptions)
  }
};

/**
 *
 * Ideally this script would trigger when the Evernote label
 * was applied to a thread.
 * 
 * Currently, it removes the Evernote label when done.
 *
 */
function processLabel(labelName) {
  // get the label for given name
  var label = GmailApp.getUserLabelByName(labelName);
  var threads = label.getThreads();

  Logger.log('Processing label "%s", found %s unread', label.getName(), threads.length);

  for (var i = 0; i < threads.length; i++) {
    handleThread(threads[i]);
    threads[i].removeLabel(label);
  }
};

function main() {
  processLabel(EVERNOTE_LABEL);
}