Add PurgeCSS

Fixes #46

webpack.config.js

@@ -1,20 +1,48 @@
 var Encore = require('@symfony/webpack-encore');
+var tailwindcss = require('tailwindcss');
+var glob = require('glob-all');
+var path = require('path');
+var PurgecssPlugin = require('purgecss-webpack-plugin');
+
+/**
+ * Custom PurgeCSS Extractor
+ * https://github.com/FullHuman/purgecss
+ * https://github.com/FullHuman/purgecss-webpack-plugin
+ */
+class TailwindExtractor {
+  static extract(content) {
+    return content.match(/[A-z0-9-:\/]+/g);
+  }
+}
 
 Encore
+    .cleanupOutputBeforeBuild()
     .setOutputPath('source/build/')
     .setPublicPath('/build')
-    .cleanupOutputBeforeBuild()
     .enableLessLoader()
     .addEntry('js/site', './assets/js/main.js')
     .addStyleEntry('css/site', './assets/less/main.less')
     .enablePostCssLoader(function(options) {
         options.config = {
-            path: 'config/postcss.config.js'
+            path: 'postcss.config.js'
         };
     })
     .enableSourceMaps(!Encore.isProduction())
-    .enableVersioning(false)
-    .enableBuildNotifications()
 ;
 
+// PurgeCSS
+Encore.addPlugin(
+    new PurgecssPlugin({
+        paths: glob.sync([
+            path.join(__dirname, "source/**/*.{twig,html,md}")
+        ]),
+        extractors: [
+            {
+                extractor: TailwindExtractor,
+                extensions: ['twig', 'html', 'md']
+            }
+        ]
+    })
+);
+
 module.exports = Encore.getWebpackConfig();