+2, +1 style reviews for Reviewable.io

gerrit-reviewable.js

// Approval by username. 
// +2, lgtm_strong or +1 +1 -> Reviewed and tested
// +1 or lgtm -> Reviewed
// -2 or -1 -> Remove previous review approval
// Review only valid if for the current version
// +1 and thumbsup are equal
var approvals = {};
var tested = {};

// Timestamp of the currently latest revision.
var lastRevisionTimestamp;

_.each(review.revisions, function(revision) {
	if(revision.snapshotTimestamp) {
       lastRevisionTimestamp = revision.snapshotTimestamp;
    }
});

function hasTestedEmoji(emojis) {
  return emojis['+2'] || emojis['+1'] >= 2 || emojis['lgtm_strong'] || emojis['thumbsup'] >= 2;
}

function hasNegativeEmoji(emojis) {
  return emojis['-1'] || emojis['-2'] || emojis['thumbdown'];
}

function hasApprovedEmoji(emojis) {
  return emojis['+1'] || emojis['lgtm'] || emojis['thumbsup'];
}

_.each(review.sentiments, function(sentiment) {
  var emojis = _.countBy(sentiment.emojis);
  if (hasNegativeEmoji(emojis)) {
    delete approvals[sentiment.username];
    delete tested[sentiment.username];
  } else if (hasTestedEmoji(emojis))  {
    approvals[sentiment.username] =       
      sentiment.timestamp >= lastRevisionTimestamp;
    tested[sentiment.username] = 
      sentiment.timestamp >= lastRevisionTimestamp;
  } else if (hasApprovedEmoji(emojis) && !approvals[sentiment.username]) {
    approvals[sentiment.username] =
      sentiment.timestamp >= lastRevisionTimestamp;
  }
});

var numApprovals = _.countBy(approvals);
var numTesters = _.countBy(tested);

var description =
  (numApprovals.true || 0) + ' of ' + 2 +
  ' approvals.';

var currentTesters = _.pick(tested, function(value, key, object) {
  return value;
});

description += numTesters.true ? ' Tested by ' + Object.keys(currentTesters) : ' Not tested';

return {
  completed: numApprovals.true >= 2 && numTesters.true >= 1,
  description: description,
  debug: {"approvals": approvals, "tested":tested, 'timestamp':lastRevisionTimestamp }
};