feat: support template in all code blocks

src/execution/handlers/handlers.code.ts

@@ -0,0 +1,34 @@
+import Handlebars from "handlebars";
+import { ExecutionHandler } from "../execution.js";
+
+const codeHandler: ExecutionHandler = ({
+  node,
+  addStep,
+}) => {
+  if (node.type !== 'code' || node.lang === 'http') {
+    return;
+  }
+  const optionParts = node.meta?.split(',') || [];
+  const options = Object.fromEntries(
+    optionParts.filter(Boolean).map((option) => {
+      const [key, value] = option.split('=');
+      return [key.trim(), value?.trim() || true];
+    })
+  );
+
+  addStep({
+    type: 'code',
+    node,
+    action: async ({ context }) => {
+      node.meta = undefined;
+      if (options['no-tmpl'] === true) {
+        return;
+      }
+      const template = Handlebars.compile(node.value);
+      const content = template(context);
+      node.value = content;
+    },
+  });
+};
+
+export { codeHandler };