gitCalcMaster.js

getNumOfCommitsOnMasterBeforeDiverged() {
  let mergeBase;
  try {
    exec.execSyncSilent(`git fetch -q | true`);
    mergeBase = exec.execRead(`git merge-base HEAD origin/master`);
  } catch (ex) {
    mergeBase = exec.execRead(`git merge-base HEAD master`);
  }
  const numOfCommits = exec.execRead(`git log --oneline ${mergeBase} | wc -l`);

  return numOfCommits;
}