get git changed files between current branch and master

const git = require('nodegit-kit');
const { exec } = require('child_process');

async function getCurrentBranchName() {
  return new Promise(resolve => {
    exec('git branch | grep \\*', function(err, stdout, stderr) {
      resolve(stdout.replace('* ', ''));
    });
  });
}

async function getChangeFiles() {
  const repo = await git.open(__dirname + '/../../../');
  const masterHistory = await git.log(repo, { branch: 'master', 'max-count': 1 });
  const currentBranchName = await getCurrentBranchName();
  const currentBranchHistory = await git.log(repo, { branch: currentBranchName.trim(), 'max-count': 1 });
  const diff = await git.diff(repo, masterHistory[0], currentBranchHistory[0]);
  const changedFiles = diff.map(file => file.path);
  console.info('ChangedFiles:');
  console.info(changedFiles.join('\n'));
  return changedFiles;
}

module.exports = getChangeFiles;