Gruntfile.js

/* eslint-disable more/no-then, no-console  */

module.exports = grunt => {
  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    gitinfo: {}, // to be populated by grunt gitinfo
  });

  Object.keys(grunt.config.get('pkg').devDependencies).forEach(key => {
    if (/^grunt(?!(-cli)?$)/.test(key)) {
      // ignore grunt and grunt-cli
      grunt.loadNpmTasks(key);
    }
  });

  function updateLocalConfig(update) {
    const environment = process.env.SIGNAL_ENV || 'production';
    const configPath = `config/local-${environment}.json`;
    let localConfig;
    try {
      localConfig = grunt.file.readJSON(configPath);
    } catch (e) {
      //
    }
    localConfig = {
      ...localConfig,
      ...update,
    };
    grunt.file.write(configPath, `${JSON.stringify(localConfig)}\n`);
  }

  grunt.registerTask('getCommitHash', () => {
    grunt.task.requires('gitinfo');
    const gitinfo = grunt.config.get('gitinfo');
    const hash = gitinfo.local.branch.current.SHA;
    updateLocalConfig({ commitHash: hash });
  });

  grunt.registerTask('date', ['gitinfo']);
  grunt.registerTask('default', ['date', 'getCommitHash']);
};