Changelog Commit

changelog-commit.js

(function() {
  'use strict';

  var nodegit = require('nodegit'),
      path = require('path');

  var ChangelogCommit = function() {
    var _config = {
          branch: 'master'
        },
        _repo = null,
        _author = null,
        _index = null,
        _oid = null;

    function _checkConfigElement(key) {
      if (!(key in _config)) {
        throw new Error('Config ' + key + ' is missing. USage: node changelog-commit.js --' + key + '=<value>');
      }
    }

    process.argv.forEach(function(arg) {
      var type = arg.split('=')[0],
          value = arg.split('=')[1];

      if (type.substring(0, 2) == '--') {
        _config[type.substring(2)] = value;
      }
    });

    _checkConfigElement('file');
    _checkConfigElement('branch');

    this.commit = function() {
      nodegit.Repository
        .open(path.resolve(__dirname, './.git'))
        .then(function(repo) {
          _repo = repo;
          return repo.getBranchCommit(_config.branch);
        })
        .then(function(firstCommit) {
          _author = firstCommit.author();
          return _author;
        })
        .then(function() {
          return _repo.openIndex();
        })
        .then(function(index) {
          _index = index;
          return index.read(1);
        })
        .then(function() {
          return _index.addByPath(_config.file);
        })
        .then(function() {
          return _index.write();
        })
        .then(function() {
          return _index.writeTree();
        })
        .then(function(oid) {
          _oid = oid;
          return nodegit.Reference.nameToId(_repo, 'HEAD');
        })
        .then(function(head) {
          return _repo.getCommit(head);
        })
        .then(function(parent) {
          return _repo.createCommit('HEAD', _author, _author, 'chore(changelog): update changelog', _oid, [parent]);
        })
        .done(function(commitId) {
          console.log('Commit for changelog: ' + commitId);
        });
    };

  };

  new ChangelogCommit().commit();

})();