Mark views as frozen

lib/nanoc/base/views/item_without_reps_view.rb

@@ -33,7 +33,7 @@ def parent
 
       parent = @context.items[parent_identifier]
 
-      parent && self.class.new(parent, @context).freeze
+      parent && self.class.new(parent, @context)
     end
 
     # @return [Boolean] True if the item is binary, false otherwise

lib/nanoc/base/views/view.rb

@@ -8,5 +8,19 @@ def initialize(context)
     def _context
       @context
     end
+
+    # @api private
+    def unwrap
+      raise NotImplementedError
+    end
+
+    # True if the wrapped object is frozen; false otherwise.
+    #
+    # @return [Boolean]
+    #
+    # @see Object#frozen?
+    def frozen?
+      unwrap.frozen?
+    end
   end
 end

spec/nanoc/base/views/item_view_spec.rb

@@ -58,7 +58,17 @@
           expect(subject._context).to equal(view_context)
         end
 
-        it { is_expected.to be_frozen }
+        context 'frozen parent' do
+          before do
+            parent_item.freeze
+          end
+
+          it { is_expected.to be_frozen }
+        end
+
+        context 'non-frozen parent' do
+          it { is_expected.not_to be_frozen }
+        end
 
         context 'with root parent' do
           let(:parent_item) { Nanoc::Int::Item.new('parent', {}, '/') }

spec/nanoc/regressions/gh_795_spec.rb

@@ -0,0 +1,19 @@
+describe 'GH-795', site: true, stdio: true do
+  before do
+    File.write('content/items.md', 'Frozen? <%= @items.unwrap.frozen? %>!')
+    File.write('content/items-view.md', 'Frozen? <%= @items.frozen? %>!')
+    File.write('Rules', <<EOS)
+  compile '/**/*' do
+    filter :erb
+    write item.identifier.without_ext + '.html'
+  end
+EOS
+  end
+
+  it 'freezes @items' do
+    Nanoc::CLI.run(['compile'])
+
+    expect(File.read('output/items.html')).to eql('Frozen? true!')
+    expect(File.read('output/items-view.html')).to eql('Frozen? true!')
+  end
+end