Jonathan Almeida: Gmail filters based on X-Phabricator-Stamps header

var REVIEWER = "jonalmeida";

var LABEL_NAME = "Phabricator/Comments";

var BODY_MATCH = "commented on this revision.";

var SENDER = "[email protected]";



/**

 * Run once manually to install the per-minute trigger.

 */

function install() {

  uninstall();

  ScriptApp.newTrigger('processInbox')

  .timeBased()

  .everyMinutes(1)

  .create();

}



/**

 * Run once manually to remove the trigger.

 */

function uninstall() {

  ScriptApp.getProjectTriggers().forEach(function(t) {

    ScriptApp.deleteTrigger(t);

  });

  PropertiesService.getScriptProperties().deleteProperty('lastRun');

}



/**

 * Every run, we try to avoid processing the same email twice because

 * there is no API trigger to run a script on every new email received.

 */

function processInbox() {

  var props = PropertiesService.getScriptProperties();

  var lastRun = parseInt(props.getProperty('lastRun') || '0');

  var now = Math.floor(Date.now() / 1000);



  // On first run, look back 2 minutes

  if (lastRun === 0) {

    lastRun = now - 120;

  }



  var label = GmailApp.getUserLabelByName(LABEL_NAME);

  if (!label) {

    label = GmailApp.createLabel(LABEL_NAME);

  }



  console.log("last run: " + lastRun);

  var threads = GmailApp.search("from:" + SENDER + " after:" + lastRun);

  console.log("threads to process: " + threads.length);

  for (var i = 0; i < threads.length; i++) {

    var thread = threads[i];

    var messages = thread.getMessages();

    console.log("messages to process: " + messages.length);

    for (var j = 0; j < messages.length; j++) {

      if (hasReviewerStamp(messages[j])) {

        thread.addLabel(label);

        console.log(thread.getFirstMessageSubject());

        break;

      }

    }

  }



  props.setProperty('lastRun', String(now));

}



function hasReviewerStamp(message) {

  var raw = message.getRawContent();

  var match = raw.match(/^X-Phabricator-Stamps:\s*(.+)$/m);

  if (!match) {

    return false;

  }



  var stamps = match[1].trim().split(/\s+/);

  return (stamps.indexOf("reviewer(@" + REVIEWER + ")") > -1) && raw.indexOf(BODY_MATCH) > -1;

}



/**

 * For debugging - see the list of labels you can search which

 * differs from what is used in the Gmail UI filter.

 */

function listAllLabels() {

  console.log("All labels");

  var labels = GmailApp.getUserLabels();

  for (var i = 0; i < labels.length; i++) {

    console.log(labels[i].getName());

  }

}