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function oneCall(fn) {
var done = false;
return function () {
if (done) return;
done = true;
return fn.apply(this, arguments);
};
}
module.exports = findCommon;
function findCommon(repo, a, b, callback) {
callback = oneCall(callback);
var ahead = 0, behind = 0;
var aStream, bStream;
var aCommit, bCommit;
if (a === b) return callback(null, ahead, behind);
repo.logWalk(a, onAStream);
repo.logWalk(b, onBStream);
function onAStream(err, stream) {
if (err) return callback(err);
aStream = stream;
aStream.read(onA);
}
function onBStream(err, stream) {
if (err) return callback(err);
bStream = stream;
bStream.read(onB);
}
function onA(err, commit) {
if (!commit) return callback(err || new Error("No common commit"));
aCommit = commit;
if (bCommit) compare();
}
function onB(err, commit) {
if (!commit) return callback(err || new Error("No common commit"));
bCommit = commit;
if (aCommit) compare();
}
function compare() {
if (aCommit.hash === bCommit.hash) return callback(null, ahead, behind);
if (aCommit.author.date.seconds > bCommit.author.date.seconds) {
ahead++;
aStream.read(onA);
}
else {
behind++;
bStream.read(onB);
}
}
}