@tangelo/tangelo-configuration-toolkit/src/lib/get-tdi-branch.js

Tangelo Configuration Toolkit is a command-line toolkit which offers support for developing a Tangelo configuration.

const execGitCommand = require('./exec-git-command');
const path           = require('path');

module.exports = function getTdiBranch(toBranchName) {
  const tdiPath = path.join(_paths.repo, _paths.tdi);
  const tdiBranch = {};

  // Fetch all
  _info(`Fetch TDI submodule`);
  const cmdFetch = execGitCommand('fetch -pf --all', tdiPath);
  if (cmdFetch.error) _warn(`Fetch failed\n${cmdFetch.error}`);

  let toBranch;
  if (toBranchName) {
    // Check if specified branch exists; we will update to this branch
    toBranch = String(toBranchName).replace(/(?:release\/)?(\d+(?:\.[\dxt]+)*)/, `release/$1`);
    const branchExists = execGitCommand(`branch --remote`, tdiPath).match(`origin/${toBranch}`);
    if (!branchExists) _error(`TDI branch "${toBranch}" does not exist. Note that TCT can only update to a release branch.`);
  }

  // Get remote release branches containing TDI HEAD commit
  const releaseBranches = execGitCommand(`branch --all --contains ${_git.commitTdi.local().hash}`, tdiPath).match(/remotes\/origin\/release\/[^\s]+/gsm);
  if (!releaseBranches || releaseBranches.error) _error(`Could not retrieve TDI release branches`);

  // Get the first possible branch; prefer release/5.1 over release/5.2:
  releaseBranches.sort((a, b) => a > b ? 1 : -1);

  // Set branch name of firstBranch without 'remotes/origin/'
  tdiBranch.name = releaseBranches[0].replace(/remotes\/origin\//g, '');

  // In case of branch switch set from.name to the old branch and name to the new branch
  if (toBranch) {
    if (tdiBranch.name > toBranch) _error(`You cannot downgrade to a lower release branch with TCT.`);
    tdiBranch.from = {name: tdiBranch.name};
    tdiBranch.name = toBranch;

    const branchHash = execGitCommand(`rev-parse origin/${toBranch}`, tdiPath);
    const commonAncestorHash = execGitCommand(`merge-base ${_git.commitTdi.local().hash} ${branchHash}`, tdiPath);
    const commonAncestorDate = execGitCommand(`show ${commonAncestorHash} --no-patch --format=%cd --date=iso-strict `, tdiPath, ['date']).date;
    tdiBranch.commonAncestor = {date: new Date(commonAncestorDate)};
  }

  // Get number of commits behind
  tdiBranch.commitsBehind = execGitCommand(`rev-list HEAD...origin/${tdiBranch.name} --count`, tdiPath);
  return tdiBranch;
};