app.path()

lib/application.js

@@ -171,6 +171,7 @@ app.match = function(url){
 app.use = function(route, fn){
   var app, home, handle;
 
+  // default route to '/'
   if ('string' != typeof route) fn = route, route = '/';
 
   // express app
@@ -344,6 +345,21 @@ app.set = function(setting, val){
   }
 };
 
+/**
+ * Return the app's absolute pathname
+ * based on the parent(s) that have
+ * mounted it.
+ *
+ * @return {String}
+ * @api private
+ */
+
+app.path = function(){
+  return this.parent
+    ? this.parent.path() + this.route
+    : '';
+};
+
 /**
  * Check if `setting` is enabled.
  *

test/app.js

@@ -1,5 +1,6 @@
 
-var express = require('../');
+var express = require('../')
+  , assert = require('assert');
 
 describe('app', function(){
   it('should inherit from event emitter', function(done){
@@ -8,3 +9,48 @@ describe('app', function(){
     app.emit('foo');
   })
 })
+
+describe('app.parent', function(){
+  it('should return the parent when mounted', function(){
+    var app = express()
+      , blog = express()
+      , blogAdmin = express();
+
+    app.use('/blog', blog);
+    blog.use('/admin', blogAdmin);
+
+    assert(!app.parent, 'app.parent');
+    blog.parent.should.equal(app);
+    blogAdmin.parent.should.equal(blog);
+  })
+})
+
+describe('app.route', function(){
+  it('should return the mounted path', function(){
+    var app = express()
+      , blog = express()
+      , blogAdmin = express();
+
+    app.use('/blog', blog);
+    blog.use('/admin', blogAdmin);
+
+    app.route.should.equal('/');
+    blog.route.should.equal('/blog');
+    blogAdmin.route.should.equal('/admin');
+  })
+})
+
+describe('app.path()', function(){
+  it('should return the canonical', function(){
+    var app = express()
+      , blog = express()
+      , blogAdmin = express();
+
+    app.use('/blog', blog);
+    blog.use('/admin', blogAdmin);
+
+    app.path().should.equal('');
+    blog.path().should.equal('/blog');
+    blogAdmin.path().should.equal('/blog/admin');
+  })
+})