feat($route): when matching consider trailing slash as optional

This makes for a much more flexible route matching:

- route /foo matches /foo and redirects /foo/ to /foo
- route /bar/ matches /bar/ and redirects /bar to /bar/

Closes angular#784

src/service/route.js

@@ -18,7 +18,10 @@ function $RouteProvider(){
    * @name angular.module.ng.$routeProvider#when
    * @methodOf angular.module.ng.$routeProvider
    *
-   * @param {string} path Route path (matched against `$location.hash`)
+   * @param {string} path Route path (matched against `$location.path`). If `$location.path`
+   *    contains redudant trailing slash or is missing one, the route will still match and the
+   *    `$location.path` will be updated to add or drop the trailing slash to exacly match the
+   *    route definition.
    * @param {Object} route Mapping information to be assigned to `$route.current` on route
    *    match.
    *
@@ -57,6 +60,16 @@ function $RouteProvider(){
     var routeDef = routes[path];
     if (!routeDef) routeDef = routes[path] = {reloadOnSearch: true};
     if (route) extend(routeDef, route); // TODO(im): what the heck? merge two route definitions?
+
+    // create redirection for trailing slashes
+    if (path) {
+      var redirectPath = (path[path.length-1] == '/')
+          ? path.substr(0, path.length-1)
+          : path +'/';
+
+      routes[redirectPath] = {redirectTo: path};
+    }
+
     return routeDef;
   };
 

test/service/routeSpec.js

@@ -168,6 +168,36 @@ describe('$route', function() {
   });
 
 
+  it('should match route with and without trailing slash', function() {
+    module(function($routeProvider){
+      $routeProvider.when('/foo', {template: 'foo.html'});
+      $routeProvider.when('/bar/', {template: 'bar.html'});
+    });
+
+    inject(function($route, $location, $rootScope) {
+      $location.path('/foo');
+      $rootScope.$digest();
+      expect($location.path()).toBe('/foo');
+      expect($route.current.template).toBe('foo.html');
+
+      $location.path('/foo/');
+      $rootScope.$digest();
+      expect($location.path()).toBe('/foo');
+      expect($route.current.template).toBe('foo.html');
+
+      $location.path('/bar');
+      $rootScope.$digest();
+      expect($location.path()).toBe('/bar/');
+      expect($route.current.template).toBe('bar.html');
+
+      $location.path('/bar/');
+      $rootScope.$digest();
+      expect($location.path()).toBe('/bar/');
+      expect($route.current.template).toBe('bar.html');
+    });
+  });
+
+
   describe('redirection', function() {
     it('should support redirection via redirectTo property by updating $location', function() {
       module(function($routeProvider) {