gulpfile.js

var plugin = 'backstage',

  gulp = require('gulp'),
  plugins = require('gulp-load-plugins')(),
  fs = require('fs'),
  cp = require('child_process'),
  del = require('del'),
  commandExistsSync = require('command-exists').sync;

require('es6-promise').polyfill();

var u = plugins.util,
  c = plugins.util.colors,
  log = plugins.util.log

var options = {
	silent: true,
	continueOnError: true // default: false
};

/**
 * Copy plugin folder outside in a build folder, recreate styles before that
 */
gulp.task( 'copy-folder', function() {
	var dir = process.cwd();
	return gulp.src( './*' )
		.pipe( plugins.exec( 'rm -Rf ./../build; mkdir -p ./../build/' + plugin + ';', {
			silent: true,
			continueOnError: true // default: false
		} ) )
		.pipe(plugins.rsync({
			root: dir,
			destination: '../build/' + plugin + '/',
			// archive: true,
			progress: false,
			silent: false,
			compress: false,
			recursive: true,
			emptyDirectories: true,
			clean: true,
			exclude: ['node_modules']
		}));
} );

/**
 * Clean the folder of unneeded files and folders
 */
gulp.task( 'remove-files', function() {

	// files that should not be present in build zip
	var files_to_remove = [
		'node_modules',
		'bin',
		'tests',
		'.travis.yml',
		'.babelrc',
		'.gitignore',
		'.codeclimate.yml',
		'.csslintrc',
		'.eslintignore',
		'.eslintrc',
		'circle.yml',
		'phpunit.xml.dist',
		'.sass-cache',
		'config.rb',
		'gulpfile.js',
		'webpack.config.js',
		'package.json',
		'package-lock.json',
		'pxg.json',
		'build',
		'.idea',
		'**/*.css.map',
		'**/.git*',
		'*.sublime-project',
		'.DS_Store',
		'**/.DS_Store',
		'__MACOSX',
		'**/__MACOSX',
		'.csscomb',
		'.csscomb.json',
		'.codeclimate.yml',
		'tests',
		'circle.yml',
		'.circleci',
		'.labels',
		'.jscsrc',
		'.jshintignore',
		'browserslist',
		'socket/node_modules',
		'socket/src',
		'socket/scss',
		'socket/.babelrc',
		'socket/gulpfile.js',
		'socket/package.json',
		'socket/semantic.json',
        'README.md',
	];

	files_to_remove.forEach( function( e, k ) {
		files_to_remove[k] = '../build/' + plugin + '/' + e;
	} );

  return del(files_to_remove, {force: true});
} );

function maybeFixBuildDirPermissions(done) {

  cp.execSync('find ./../build -type d -exec chmod 755 {} \\;');

  return done();
}
maybeFixBuildDirPermissions.description = 'Make sure that all directories in the build directory have 755 permissions.';
gulp.task( 'fix-build-dir-permissions', maybeFixBuildDirPermissions );

function maybeFixBuildFilePermissions(done) {

  cp.execSync('find ./../build -type f -exec chmod 644 {} \\;');

  return done();
}
maybeFixBuildFilePermissions.description = 'Make sure that all files in the build directory have 644 permissions.';
gulp.task( 'fix-build-file-permissions', maybeFixBuildFilePermissions );

function maybeFixIncorrectLineEndings(done) {
  if (!commandExistsSync('dos2unix')) {
    log( c.red( 'Could not ensure that line endings are correct on the build files since you are missing the "dos2unix" utility! You should install it.' ) );
    log( c.red( 'However, this is not a very big deal. The build task will continue.' ) );
  } else {
    cp.execSync('find ./../build -type f -print0 | xargs -0 -n 1 -P 4 dos2unix');
  }

  return done();
}
maybeFixIncorrectLineEndings.description = 'Make sure that all line endings in the files in the build directory are UNIX line endings.';
gulp.task( 'fix-line-endings', maybeFixIncorrectLineEndings );

/**
 * Create a zip archive out of the cleaned folder and delete the folder
 */
gulp.task( 'make-zip', function() {
	var versionString = '';
	// get plugin version from the main plugin file
	var contents = fs.readFileSync("./" + plugin + ".php", "utf8");

	// split it by lines
	var lines = contents.split(/[\r\n]/);

	function checkIfVersionLine(value, index, ar) {
		var myRegEx = /^[\s\*]*[Vv]ersion:/;
		if (myRegEx.test(value)) {
			return true;
		}
		return false;
	}

	// apply the filter
	var versionLine = lines.filter(checkIfVersionLine);

	versionString = versionLine[0].replace(/^[\s\*]*[Vv]ersion:/, '').trim();
	versionString = '-' + versionString.replace(/\./g, '-');

	return gulp.src('./')
		.pipe(plugins.exec('cd ./../; rm -rf ' + plugin[0].toUpperCase() + plugin.slice(1) + '*.zip; cd ./build/; zip -r -X ./../' + plugin[0].toUpperCase() + plugin.slice(1) + versionString + '.zip ./; cd ./../; rm -rf build'));

} );

function buildSequence(cb) {
  return gulp.series( 'copy-folder', 'remove-files', 'fix-build-dir-permissions', 'fix-build-file-permissions', 'fix-line-endings' )(cb);
}
buildSequence.description = 'Sets up the build folder';
gulp.task( 'build', buildSequence );

function zipSequence(cb) {
  return gulp.series( 'build', 'make-zip' )(cb);
}
zipSequence.description = 'Creates the zip file';
gulp.task( 'zip', zipSequence  );