Rendering my first template with actually following paths.

Before I was hard-coding the path to the reference. Now I am following the full path programmatically using the new ContextElement and Walkable traits.

src/renderer/renderer.rs

@@ -48,8 +48,7 @@ impl<'a> DustRenderer<'a> {
 
     pub fn render<C>(&self, name: &str, context: &C) -> Result<String, RenderError>
     where
-        C: Index<&'a str>,
-        <C as std::ops::Index<&'a str>>::Output: Renderable,
+        C: ContextElement,
     {
         let main_template = match self.templates.get(name) {
             Some(tmpl) => tmpl,
@@ -64,8 +63,7 @@ impl<'a> DustRenderer<'a> {
 
     fn render_template<C>(&self, template: &Template, context: &C) -> Result<String, RenderError>
     where
-        C: Index<&'a str>,
-        <C as std::ops::Index<&'a str>>::Output: Renderable,
+        C: ContextElement,
     {
         let mut output = String::new();
         for elem in &template.contents.elements {
@@ -81,13 +79,12 @@ impl<'a> DustRenderer<'a> {
 
     fn render_tag<C>(&self, tag: &DustTag, context: &C) -> Result<String, RenderError>
     where
-        C: Index<&'a str>,
-        <C as std::ops::Index<&'a str>>::Output: Renderable,
+        C: ContextElement,
     {
         match tag {
             DustTag::DTComment(comment) => (),
             DustTag::DTReference(reference) => {
-                let val = context.index("name");
+                let val = walk_path(context, &reference.path.keys);
                 return Ok(val.render());
             }
             _ => (), // TODO: Implement the rest