Support template chaining for partials

middleman-core/features/chained_templates.feature

@@ -16,4 +16,91 @@ Feature: Templates should be chainable
 
     And the file "index.html" should contain "Title</h1>"
     And the file "index.html" should contain "Subtitle</h2>"
-    And the file "index.html" should contain "Sup</h3>"
+    And the file "index.html" should contain "Sup</h3>"
+
+  Scenario: Partials are parsed by multiple template engines: Outer template has .erb and inner .md.erb
+    Given a fixture app "partial-chained_templates-app"
+    And a template named "my_template.html.erb" with:
+    """
+    <h1>My Template</h1>
+
+    <%= partial 'my_partial' %>
+    """
+    And a template named "my_partial.html.md.erb" with:
+    """
+    ## My Partial
+    
+    <%= 'hello world' %>
+    """
+    And the Server is running
+    When I go to "/my_template.html"
+    Then I should see:
+    """
+    <h1>My Template</h1>
+    """
+    Then I should see:
+    """
+    <h2 id="my-partial">My Partial</h2>
+    """
+    Then I should see:
+    """
+    <p>hello world</p>
+    """
+
+  Scenario: Partials are parsed by multiple template engines: Outer template has .md.erb and inner .md.erb
+    Given a fixture app "partial-chained_templates-app"
+    And a template named "my_template.html.md.erb" with:
+    """
+    # My Template
+
+    <%= partial 'my_partial' %>
+    """
+    And a template named "my_partial.html.md.erb" with:
+    """
+    ## My Partial
+    
+    <%= 'hello world' %>
+    """
+    And the Server is running
+    When I go to "/my_template.html"
+    Then I should see:
+    """
+    <h1 id="my-template">My Template</h1>
+    """
+    Then I should see:
+    """
+    <h2 id="my-partial">My Partial</h2>
+    """
+    Then I should see:
+    """
+    <p>hello world</p>
+    """
+
+  Scenario: Partials are parsed by multiple template engines: Outer template has .md.erb, and inner .erb
+    Given a fixture app "partial-chained_templates-app"
+    And a template named "my_template.html.md.erb" with:
+    """
+    # My Template
+
+    <%= partial 'my_partial' %>
+    """
+    And a template named "my_partial.html.erb" with:
+    """
+    <h2>My Partial</h2>
+    
+    <%= 'hello world' %>
+    """
+    And the Server is running
+    When I go to "/my_template.html"
+    Then I should see:
+    """
+    <h1 id="my-template">My Template</h1>
+    """
+    Then I should see:
+    """
+    <h2>My Partial</h2>
+    """
+    Then I should see:
+    """
+    <p>hello world</p>
+    """

middleman-core/lib/middleman-core/core_extensions/rendering.rb

@@ -146,18 +146,7 @@ module Middleman
           @current_locs = locs
           @current_opts = opts
 
-          # Keep rendering template until we've used up all extensions. This
-          # handles cases like `style.css.sass.erb`
-          content = nil
-          while ::Tilt[path]
-            begin
-              opts[:template_body] = content if content
-              content = render_individual_file(path, locs, opts, context)
-              path = File.basename(path, File.extname(path))
-            rescue LocalJumpError
-              raise "Tried to render a layout (calls yield) at #{path} like it was a template. Non-default layouts need to be in #{source}/#{config[:layouts_dir]}."
-            end
-          end
+          content = _render_with_all_renderers(path, locs, context, opts)
 
           # If we need a layout and have a layout, use it
           if layout_path = fetch_layout(engine, opts)
@@ -175,6 +164,34 @@ module Middleman
           @current_opts = nil
         end
 
+        private
+
+        def _render_with_all_renderers(path, locs, context, opts, &block)
+          # Keep rendering template until we've used up all extensions. This
+          # handles cases like `style.css.sass.erb`
+          content = nil
+
+          while ::Tilt[path]
+            begin
+              opts[:template_body] = content if content
+
+              content = if block_given?
+                          render_individual_file(path, locs, opts, context, &block)
+                        else
+                          render_individual_file(path, locs, opts, context)
+                        end
+
+              path = File.basename(path, File.extname(path))
+            rescue LocalJumpError
+              raise "Tried to render a layout (calls yield) at #{path} like it was a template. Non-default layouts need to be in #{source}/#{config[:layouts_dir]}."
+            end
+          end
+
+          content
+        end
+
+        public
+
         # Sinatra/Padrino compatible render method signature referenced by some view
         # helpers. Especially partials.
         #
@@ -215,7 +232,7 @@ module Middleman
             File.read(r.source_file)
           else
             # Render the partial if found, otherwide throw exception
-            render_individual_file(found_partial, locals, options, self, &block)
+            _render_with_all_renderers(found_partial, locals, self, options, &block)
           end
         end