eejs

bar.ejs

<%  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

eejs.js

/* Basic usage:
 *
 * require("./eejs").require("./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;
}

foo.ejs

<% var e = require("./eejs.js"); e.init(buf); %>

<% e.begin_define_block("foo"); %>
YY
<% e.end_define_block(); %>

<% e.require("./bar.ejs"); %>