First attempt to implement the block system from django templates on top of the npm module ejs.

src/node/eejs/eejs.js

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+/*
+ * Copyright (c) 2011 RedHog (Egil Möller) <egil.moller@freecode.no>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Basic usage:
+ *
+ * require("./eejs").require("./examples/foo.ejs")
+ */
+
+var ejs = require("ejs");
+var fs = require("fs");
+
+exports.init = function (b, recursive) {
+  if (!exports.info) {
+    exports.info = {
+      buf_stack: [],
+      block_stack: [],
+      blocks: {},
+      level: 1
+    }
+  }
+  exports.info.buf = b;
+}
+
+exports.begin_capture = function() {
+  exports.info.buf_stack.push(exports.info.buf.concat());
+  exports.info.buf.splice(0, exports.info.buf.length);
+}
+
+exports.end_capture = function () {
+  var res = exports.info.buf.join("");
+  exports.info.buf.splice.apply(
+    exports.info.buf,
+    [0, exports.info.buf.length].concat(exports.info.buf_stack.pop()));
+  return res;
+}
+
+exports.begin_define_block = function (name) {
+  if (typeof exports.info.blocks[name] == "undefined")
+    exports.info.blocks[name] = {};
+  exports.info.block_stack.push(name);
+  exports.begin_capture();
+}
+
+exports.end_define_block = function () {
+  content = exports.end_capture();
+  var name = exports.info.block_stack.pop();
+  if (typeof exports.info.blocks[name].content == "undefined")
+    exports.info.blocks[name].content = content;
+  return exports.info.blocks[name].content;
+}
+
+exports.end_block = function () {
+  var res = exports.end_define_block();
+  exports.info.buf.push(res);
+}
+
+exports.begin_block = exports.begin_define_block;
+
+exports.require = function (name, args) {
+  if (args == undefined) args = {};
+  if (exports.info)
+    exports.info.buf_stack.push(exports.info.buf);
+  var res = ejs.render(
+    fs.readFileSync(require.resolve(name)).toString(),
+    args);
+  if (exports.info)
+    exports.info.buf = exports.info.buf_stack.pop();
+  if (exports.info.buf)
+    exports.info.buf.push(res);
+  return res;
+}

src/node/eejs/examples/bar.ejs

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+<%  var e = require("./eejs.js"); e.init(buf); %>
+
+a
+<% e.begin_block("bar"); %>
+  A
+  <% e.begin_block("foo"); %>
+  XX
+  <% e.end_block(); %>
+  B
+<% e.end_block(); %>
+b

src/node/eejs/examples/foo.ejs

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+<% var e = require("./eejs.js"); e.init(buf); %>
+
+<% e.begin_define_block("foo"); %>
+YY
+<% e.end_define_block(); %>
+
+<% e.require("./bar.ejs"); %>