Allow RoutedResult to be asked about the path that matched

Author: robacarp

spec/amber_router/routed_result/routed_result_spec.cr

@@ -44,4 +44,16 @@ describe Amber::Router::RoutedResult do
       result["name"].should eq "john"
     end
   end
+
+  context "path" do
+    it "allows retrieving the matched path" do
+      router = build do
+        add "/get/users/:id", :user
+      end
+
+      result = router.find("/get/users/3")
+      result.found?.should be_true
+      result.path.should eq "/get/users/:id"
+    end
+  end
 end

src/amber/router/routed_result.cr

@@ -11,6 +11,14 @@ module Amber::Router
       @terminal_segment.not_nil!
     end
 
+    def path
+      if @terminal_segment
+        terminal_segment.full_path
+      else
+        raise "Cannot provide route path when no route was found. Ask first with #found?"
+      end
+    end
+
     def found?
       ! @terminal_segment.nil?
     end