Use gulp to check the textdomain in a WordPress theme

gulp-util-get-theme.js

/**
 * Get theme folder from theme parameter or use granule
 *
 * @returns {String|util.env.theme}
 */
function utilGetTheme() {

	var theme = 'granule';

	if ( util.env.theme ) {

		// check for a command line variable
		// use it if it exists
		theme = util.env.theme;

	}

	console.log( 'Theme Name: ' + UtilUpperCaseFirstWord( theme ) );

	return theme;

}

gulp-wordpress-checktextdomain.js

gulp.task(
	'checktextdomain',
	function() {

		var theme_slug = utilGetTheme();

	    return gulp
	    .src( './' + theme_slug + '/**/*.php')
	    .pipe(
			checktextdomain(
				{
			        text_domain: theme_slug, //Specify allowed domain(s)
			        keywords: [ //List keyword specifications
			            '__:1,2d',
			            '_e:1,2d',
			            '_x:1,2c,3d',
			            'esc_html__:1,2d',
			            'esc_html_e:1,2d',
			            'esc_html_x:1,2c,3d',
			            'esc_attr__:1,2d',
			            'esc_attr_e:1,2d',
			            'esc_attr_x:1,2c,3d',
			            '_ex:1,2c,3d',
			            '_n:1,2,4d',
			            '_nx:1,2,4c,5d',
			            '_n_noop:1,2,3d',
			            '_nx_noop:1,2,3c,4d'
			        ],
			    }
			)
		);
	}
);

gulpfile-header.js

var gulp = require( 'gulp' );
var util = require( 'gulp-util' );
var checktextdomain = require( 'gulp-checktextdomain' );