add applyRouterMiddleware (#21)

modules/applyRouterMiddleware.js

@@ -0,0 +1,36 @@
+/**
+ * This file is subject to the terms and conditions defined in the LICENSE file
+ * which is found in the in the root directory of React Router source tree.
+ *
+ * https://github.com/reactjs/react-router/blob/master/LICENSE.md
+ */
+
+import React, { createElement } from 'react';
+import RouterContext from './RouterContext';
+
+export default (...middlewares) => {
+  const withContext = middlewares.map(m => m.renderRouterContext).filter(f => f);
+  const withComponent = middlewares.map(m => m.renderRouteComponent).filter(f => f);
+  const makeCreateElement = (baseCreateElement = createElement) => (
+    (Component, props) => (
+      withComponent.reduceRight(
+        (previous, renderRouteComponent) => (
+          renderRouteComponent(previous, props)
+        ), baseCreateElement(Component, props)
+      )
+    )
+  );
+
+  return (renderProps) => (
+    withContext.reduceRight(
+      (previous, renderRouterContext) => (
+        renderRouterContext(previous, renderProps)
+      ), (
+      <RouterContext
+        {...renderProps}
+        createElement={makeCreateElement(renderProps.createElement)}
+      />
+      )
+    )
+  );
+};