diff --git a/build/build.js b/build/build.js
index 401714b9..7306415e 100644
--- a/build/build.js
+++ b/build/build.js
@@ -1,7 +1,7 @@
 const fs = require('fs');
 const path = require('path');
-const child = require('child_process');
 const { argv } = require('yargs');
+const { sync } = require('cross-spawn');
 
 const compilerOptionsBase = {
     target: 'es2019',
@@ -52,7 +52,7 @@ for (const package of packages) {
     if (package === 'ui-default') continue;
     const basedir = path.resolve(process.cwd(), 'packages', package);
     const files = fs.readdirSync(basedir);
-    if (!files.includes('src') && !files.map(n => n.split('.')[1]).includes('ts') && package !== 'utils') continue;
+    if (!files.includes('src') && !files.map((n) => n.split('.')[1]).includes('ts') && package !== 'utils') continue;
     if (package !== 'hydrooj') config.references.push({ path: `packages/${package}` });
     fs.writeFileSync(
         path.resolve(basedir, 'tsconfig.json'),
@@ -64,17 +64,17 @@ for (const package of packages) {
             if (!fs.statSync(path.resolve(basedir, 'src', file)).isFile()) continue;
             const name = file.split('.')[0];
             if (['handler', 'service', 'lib', 'model', 'script'].includes(name)) {
-                fs.writeFileSync(path.resolve(basedir, name + '.js'), `module.exports = require('./dist/${name}');\n`);
+                fs.writeFileSync(path.resolve(basedir, `${name}.js`), `module.exports = require('./dist/${name}');\n`);
             }
         }
     }
 }
 fs.writeFileSync(path.resolve(process.cwd(), 'tsconfig.json'), JSON.stringify(config));
 
-child.execSync('./node_modules/.bin/tsc -b packages/hydrooj', { stdio: 'inherit' });
+sync('./node_modules/.bin/tsc -b packages/hydrooj', { stdio: 'inherit' });
 
 if (argv.watch) {
-    child.execSync('./node_modules/.bin/tsc -b --watch', { stdio: 'inherit' });
+    sync('./node_modules/.bin/tsc -b --watch', { stdio: 'inherit' });
 } else {
-    child.execSync('./node_modules/.bin/tsc -b', { stdio: 'inherit' });
-}
\ No newline at end of file
+    sync('./node_modules/.bin/tsc -b', { stdio: 'inherit' });
+}
diff --git a/packages/ui-default/build/config/webpack.js b/packages/ui-default/build/config/webpack.js
index f25ba723..54792c17 100644
--- a/packages/ui-default/build/config/webpack.js
+++ b/packages/ui-default/build/config/webpack.js
@@ -103,6 +103,11 @@ export default function (env = {}) {
           test: /\.css$/,
           use: [extractCssLoader(), cssLoader(), postcssLoader()],
         },
+        {
+          test: /\.wasm$/,
+          use: [fileLoader()],
+          type: 'javascript/auto',
+        },
       ],
     },
     optimization: {
diff --git a/packages/ui-default/components/highlighter/highlighter.page.js b/packages/ui-default/components/highlighter/highlighter.page.js
index 1e9bfcc0..60b4f416 100644
--- a/packages/ui-default/components/highlighter/highlighter.page.js
+++ b/packages/ui-default/components/highlighter/highlighter.page.js
@@ -1,14 +1,18 @@
 import { AutoloadPage } from 'vj/misc/Page';
+import load from 'vj/components/wastyle/index';
+import Notification from 'vj/components/notification/index';
 
-const highlighterPage = new AutoloadPage('highlighterPage', () => {
-  import('./prismjs').then((module) => {
-    const prismjs = module.default;
-    function runHighlight($container) {
-      prismjs.highlightBlocks($container);
-    }
-    runHighlight($('body'));
-    $(document).on('vjContentNew', (e) => runHighlight($(e.target)));
-  });
+const highlighterPage = new AutoloadPage('highlighterPage', async () => {
+  const [{ default: prismjs }, [success, format]] = await Promise.all([
+    import('./prismjs'),
+    load(),
+  ]);
+  if (!success) Notification.error(`Astyle load fail: ${format}`);
+  function runHighlight($container) {
+    prismjs.highlightBlocks($container, success ? format : null);
+  }
+  runHighlight($('body'));
+  $(document).on('vjContentNew', (e) => runHighlight($(e.target)));
 });
 
 export default highlighterPage;
diff --git a/packages/ui-default/components/highlighter/prismjs.js b/packages/ui-default/components/highlighter/prismjs.js
index 26a086ea..4947c9d9 100644
--- a/packages/ui-default/components/highlighter/prismjs.js
+++ b/packages/ui-default/components/highlighter/prismjs.js
@@ -11,7 +11,7 @@ To add a new language to highlight:
 import Prism from 'prismjs';
 
 import Clipboard from 'clipboard';
-import Notification from 'vj/components/notification';
+import Notification from 'vj/components/notification/index';
 import i18n from 'vj/utils/i18n';
 
 import languageMeta from './meta';
@@ -95,16 +95,24 @@ Prism.hooks.add('before-highlight', (env) => {
 });
 
 const prismjsApiWrap = {
-  highlightBlocks: ($dom) => {
+  highlightBlocks: ($dom, format) => {
     $dom.find('pre code').get().forEach((code) => {
-      const $pre = $(code).parent();
+      const $code = $(code);
+      const $pre = $code.parent();
       $pre.addClass('syntax-hl');
       if ($pre.closest('[data-syntax-hl-show-line-number]')) {
         $pre.addClass('line-numbers');
       }
+      const language = ($(code).attr('class') || '').trim();
+      const astyle = language.match(/astyle-([a-z]+)/);
+      if (format && astyle && astyle[1]) {
+        const [success, result] = format($code.text(), `${UserContext.astyleOptions.trim()} mode=${astyle[1]}`);
+        console.log(success.result);
+        if (!success) Notification.error('Code format fail');
+        else $code.text(result.replace(/^#(include|import)[\t ]*(<|")/gm, (match, p1, p2) => `#${p1} ${p2}`));
+      }
       // try to map the language name
-      const language = $(code).attr('class');
-      const m = (language || '').trim().match(/^language-(.+)$/);
+      const m = language.match(/language-([a-z]+)/);
       if (m && m[1]) {
         const languageName = m[1].toLowerCase();
         if (languageExtMap[languageName]) {
diff --git a/packages/ui-default/components/wastyle/index.js b/packages/ui-default/components/wastyle/index.js
new file mode 100644
index 00000000..98a87907
--- /dev/null
+++ b/packages/ui-default/components/wastyle/index.js
@@ -0,0 +1,12 @@
+import astyleBinaryUrl from 'wastyle/dist/astyle-optimize-size.wasm';
+
+export default async function load() {
+    const { init, format } = await import('wastyle');
+    try {
+        await init(astyleBinaryUrl);
+        console.log('WAstyle is ready!');
+        return [true, format];
+    } catch (e) {
+        return [false, e.message];
+    }
+}
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 8aec11bf..d5bff3a9 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -97,6 +97,7 @@
     "uuid": "^8.3.2",
     "vinyl-buffer": "^1.0.1",
     "vj-simplemde": "0.0.8",
+    "wastyle": "^0.0.5",
     "webpack": "^4.44.2",
     "webpack-bundle-analyzer": "^4.4.0",
     "webpack-dev-server": "^3.11.2"
diff --git a/packages/ui-default/setting.yaml b/packages/ui-default/setting.yaml
index 2b5da1f2..e8db7baf 100644
--- a/packages/ui-default/setting.yaml
+++ b/packages/ui-default/setting.yaml
@@ -48,11 +48,11 @@ lang_highlight_id:
   name: lang_highlight_id
   desc: Language Highlight ID
   default:
-    c: c
-    cc: cpp
-    cs: csharp
+    c: c astyle-c
+    cc: cpp astyle-c
+    cs: csharp astyle-cs
     pas: pascal
-    java: java
+    java: java astyle-java
     py: python
     py3: python
     php: php
@@ -85,3 +85,12 @@ showInvisibleChar:
   type: boolean
   desc: show invisible characters when formatting code
   category: preference
+astyleOptions:
+  type: text
+  desc: astyle formatting options
+  category: preference
+  value: >
+    style=java attach-namespaces attach-classes attach-inlines attach-extern-c attach-closing-while 
+    indent-col1-comments break-blocks pad-oper pad-comma pad-header unpad-paren align-pointer=name 
+    break-one-line-headers attach-return-type attach-return-type-decl convert-tabs close-templates 
+    max-code-length=110 break-after-logical