initial import

LICENSE

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+# MIT license.  See http://www.opensource.org/licenses/mit-license.php
+
+Copyright (c) 2012 Jay Adkisson.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

index.js

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+module.exports = require('./lib/express-handlebars');
+exports.version = JSON.parse(require('fs').readFileSync(__dirname + '/package.json')).version;

lib/express-handlebars.js

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+var Handlebars = require('handlebars');
+
+module.exports = function(app) {
+  // *.hbs templates are rendered with Handlebars
+  app.register('hbs', Handlebars);
+
+  // hook into express's native helpers function to register helpers
+  // with Handlebars
+  var oldHelpers = app.helpers.bind(app)
+  app.helpers = function(h) {
+    Object.keys(h).forEach(function(k) {
+      Handlebars.registerHelper(k, h[k]);
+    });
+
+    return oldHelpers(h);
+  }
+
+  // Handlebars doesn't really do dynamic helpers,
+  // so we kind of hack them on here.
+  var oldDynamicHelpers = app.dynamicHelpers.bind(app);
+
+  // first, use the native dynamicHelpers to add the request and response
+  // objects to the rendering context
+  oldDynamicHelpers({
+    __req: function(req, res) { return req; },
+    __res: function(req, res) { return res; }
+  });
+
+  // then, when you register a dynamic helper, replace it with a function
+  // that uses the context's cache of (req, res) to create your helpers.
+  // the contract is that the dynamicHelper definition function is only
+  // called once per request.
+  app.dynamicHelpers = function(dh) {
+    const CACHE_KEY = '[[ dynamic helpers ]]';
+    Object.keys(dh).forEach(function(k) {
+      Handlebars.registerHelper(k, function() {
+        var self = this;
+
+        function getHelper(k) {
+          var cache = self.__res[CACHE_KEY] = self.__res[CACHE_KEY] || {}
+          return (cache[k] = cache[k] || dh[k](self.__req, self.__res));
+        }
+
+        return getHelper(k).apply(self, arguments);
+      });
+    });
+
+    return oldDynamicHelpers(dh);
+  };
+};

package.json

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+{
+  "name": "express-handlebars",
+  "version": "0.0.1",
+  "description": "handlebars.js integration with express",
+  "keywords": ["handlebars", "express", "helpers", "dynamicHelpers", "templates"],
+  "author": "Jay Adkisson <jjmadkisson at gmail dot com>",
+  "repository": "git://github.com/jayferd/express-handlebars",
+
+  "files": ["index.js", "lib", "package.json", "LICENSE"],
+  "main": "index.js",
+
+  "dependencies": {
+    "handlebars": "*"
+  }
+}