Add first draft of pattern engines

Author: geoffp

builder/pattern_engines/engine_mustache.js

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+/* 
+ * mustache pattern engine for patternlab-node - v0.10.1 - 2015 
+ * 
+ * Brian Muenzenmeyer, and the web community.
+ * Licensed under the MIT license. 
+ * 
+ * Many thanks to Brad Frost and Dave Olsen for inspiration, encouragement, and advice. 
+ *
+ */
+
+(function () {
+  "use strict";
+
+  var Mustache = require('mustache');
+
+  var engine_mustache = {
+    engine: Mustache,
+    fileExtension: '.mustache',
+
+    // render it
+    renderPattern: function renderPattern(template, data, partials) {
+      if (partials) {
+        return Mustache.render(template, data, partials);
+      }
+      return Mustache.render(template, data);
+    },
+
+    // find and return any {{> template-name }} within pattern
+    findPartials: function findPartials(pattern) {
+      var matches = pattern.template.match(/{{>([ ])?([A-Za-z0-9-]+)(?:\:[A-Za-z0-9-]+)?(?:(| )\(.*)?([ ])?}}/g);
+      return matches;
+    }
+  };
+  
+  module.exports = engine_mustache;
+})();

builder/pattern_engines/pattern_engines.js

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+/*
+ * patternlab-node - v0.10.1 - 2015
+ *
+ * Brian Muenzenmeyer, and the web community.
+ * Licensed under the MIT license.
+ *
+ * Many thanks to Brad Frost and Dave Olsen for inspiration, encouragement, and advice.
+ *
+ */
+
+(function () {
+  'use strict';
+
+  // list of supported pattern engines
+  var supportedPatternEngineNames = [
+    'mustache',
+    'handlebars'
+  ];
+
+  // hash of all loaded pattern engines, empty at first
+  var patternEngines = {};
+
+  // try to load all supported engines
+  supportedPatternEngineNames.forEach(function (engineName) {
+    try {
+      patternEngines[engineName] = require('./engine_' + engineName);
+    } catch (err) {
+      console.log(err, 'pattern engine "' + engineName + '" not loaded. Did you install its dependency with npm?');
+    }
+  });
+
+  patternEngines.getEngineForPattern = function (pattern) {
+
+  };
+
+  module.exports = patternEngines;
+
+})();