Update yield_content to append default to ERB template buffer

sinatra-contrib/lib/sinatra/capture.rb

@@ -97,8 +97,9 @@ def capture(*args, &block)
         result = block[*args]
       elsif current_engine == :erb || current_engine == :slim
         @_out_buf, _buf_was = '', @_out_buf
-        block[*args]
-        result = eval('@_out_buf', block.binding)
+        raw = block.call(*args)
+        captured = block.binding.eval('@_out_buf')
+        result = captured.empty? ? raw : captured
         @_out_buf = _buf_was
       else
         buffer     = eval '_buf if defined?(_buf)', block.binding
@@ -109,7 +110,7 @@ def capture(*args, &block)
         buffer.clear unless buffer.nil?
         result = render(current_engine, dummy, options, &block)
       end
-      result.strip.empty? && @capture ? @capture : result
+      result && result.strip.empty? && @capture ? @capture : result
     ensure
       buffer.replace(old_buffer) unless buffer.nil?
     end

sinatra-contrib/lib/sinatra/content_for.rb

@@ -32,7 +32,7 @@ module Sinatra
   # to yield_content.
   #
   #     # layout.erb
-  #     <%= yield_content :some_key_with_no_content do %>
+  #     <% yield_content :some_key_with_no_content do %>
   #       <chunk of="default html">...</chunk>
   #     <% end %>
   #
@@ -171,9 +171,17 @@ def clear_content_for(key)
     #
     # Would pass <tt>1</tt> and <tt>2</tt> to all the blocks registered
     # for <tt>:head</tt>.
-    def yield_content(key, *args)
-      return yield(*args) if block_given? && content_blocks[key.to_sym].empty?
-      content_blocks[key.to_sym].map { |b| capture(*args, &b) }.join
+    def yield_content(key, *args, &block)
+      if block_given? && !content_for?(key)
+        haml? ? capture_haml(*args, &block) : yield(*args)
+      else
+        content = content_blocks[key.to_sym].map { |b| capture(*args, &b) }
+        content.join.tap do |c|
+          if block_given? && (erb? || erubi? || erubis?)
+            @_out_buf << c
+          end
+        end
+      end
     end
 
     private

sinatra-contrib/spec/capture_spec.rb

@@ -50,6 +50,12 @@ def render(engine, template)
       expect(render(:erb, "iso_8859_1")).to eq("ISO-8859-1 -")
     end
   end
+
+  describe 'without templates' do
+    it 'captures empty blocks' do
+      expect(capture {}).to be_nil
+    end
+  end
 end
 
 __END__

sinatra-contrib/spec/content_for/layout.erb

@@ -1 +1 @@
-<%= yield_content :foo %>
+<%= yield_content :foo %>

sinatra-contrib/spec/content_for/layout.erubis

@@ -1 +1 @@
-<%= yield_content :foo %>
+<%= yield_content :foo %>

sinatra-contrib/spec/content_for/parameter_value.erb

@@ -0,0 +1 @@
+<% content_for :foo, 'foo' %>

sinatra-contrib/spec/content_for/parameter_value.erubis

@@ -0,0 +1 @@
+<% content_for :foo, 'foo' %>

sinatra-contrib/spec/content_for/parameter_value.haml

@@ -0,0 +1 @@
+- content_for :foo, 'foo'

sinatra-contrib/spec/content_for/parameter_value.slim

@@ -0,0 +1 @@
+- content_for :foo, 'foo'

sinatra-contrib/spec/content_for/yield_block.erb

@@ -0,0 +1 @@
+<% yield_content :foo do %>baz<% end %>

sinatra-contrib/spec/content_for/yield_block.erubis

@@ -0,0 +1 @@
+<% yield_content :foo do %>baz<% end %>

sinatra-contrib/spec/content_for/yield_block.haml

@@ -0,0 +1,2 @@
+= yield_content :foo  do
+  baz

sinatra-contrib/spec/content_for/yield_block.slim

@@ -0,0 +1,2 @@
+= yield_content :foo  do
+  | baz

sinatra-contrib/spec/content_for_spec.rb

@@ -33,7 +33,7 @@ def render(engine, template)
     end
 
     it 'renders default content if no block matches the key and a default block is specified' do
-      content_for(:bar) { "bar" }
+      expect(yield_content(:foo) {}).to be_nil
       expect(yield_content(:foo) { "foo" }).to eq("foo")
     end
 
@@ -205,6 +205,27 @@ def body
             end
           end
 
+          describe 'with a default content block' do
+            describe 'when content_for key exists' do
+              it 'ignores default content and renders content' do
+                expect(get('/yield_block/same_key')).to be_ok
+                expect(body).to eq("foo")
+              end
+            end
+
+            describe 'when content_for key is missing' do
+              it 'renders default content block' do
+                expect(get('/yield_block/different_key')).to be_ok
+                expect(body).to eq("baz")
+              end
+            end
+          end
+
+          it 'renders content set as parameter' do
+            expect(get('/parameter_value')).to be_ok
+            expect(body).to eq("foo")
+          end
+
           it 'renders blocks declared with the same key you use when rendering' do
             expect(get('/same_key')).to be_ok
             expect(body).to eq("foo")