Split out common functions into discourse-common module

app/assets/javascripts/discourse-common/lib/helpers.js.es6

@@ -0,0 +1,52 @@
+import { get } from 'discourse-common/lib/raw-handlebars';
+
+// `Ember.Helper` is only available in versions after 1.12
+export function htmlHelper(fn) {
+  if (Ember.Helper) {
+    return Ember.Helper.helper(function() {
+      return new Handlebars.SafeString(fn.apply(this, Array.prototype.slice.call(arguments)) || '');
+    });
+  } else {
+    return Ember.Handlebars.makeBoundHelper(function() {
+      return new Handlebars.SafeString(fn.apply(this, Array.prototype.slice.call(arguments)) || '');
+    });
+  }
+}
+
+export function registerHelper(name, fn) {
+  Ember.HTMLBars._registerHelper(name, fn);
+}
+
+function resolveParams(ctx, options) {
+  let params = {};
+  const hash = options.hash;
+
+  if (hash) {
+    if (options.hashTypes) {
+      Object.keys(hash).forEach(function(k) {
+        const type = options.hashTypes[k];
+        if (type === "STRING" || type === "StringLiteral") {
+          params[k] = hash[k];
+        } else if (type === "ID" || type === "PathExpression") {
+          params[k] = get(ctx, hash[k], options);
+        }
+      });
+    } else {
+      params = hash;
+    }
+  }
+  return params;
+}
+
+export function registerUnbound(name, fn) {
+  const func = function(property, options) {
+    if (options.types && (options.types[0] === "ID" || options.types[0] === "PathExpression")) {
+      property = get(this, property, options);
+    }
+
+    return fn.call(this, property, resolveParams(this, options));
+  };
+
+  Handlebars.registerHelper(name, func);
+  Ember.Handlebars.registerHelper(name, func);
+}