Add the possibility to configure options that are passed to Haml::Engine when evalutating HAML template.

Options can be configured in two different ways:

* Application-wide, using set_option :haml
  e.g.: set_option :haml, :format      => :haml4,
                          :escape_html => true

* By passing options directly to the `haml` helper
  e.g.: haml '%strong Hello World', :options => {:format => :html4}

Note that if you use both way, options will be merged.

lib/sinatra.rb

@@ -604,7 +604,8 @@ module Sinatra
     private
     
       def render_haml(content, options = {}, &b)
-        ::Haml::Engine.new(content).render(options[:scope] || self, options[:locals] || {}, &b)
+        haml_options = (options[:options] || {}).merge(Sinatra.options.haml)
+        ::Haml::Engine.new(content, haml_options).render(options[:scope] || self, options[:locals] || {}, &b)
       end
         
   end
@@ -837,6 +838,7 @@ module Sinatra
         :public => Dir.pwd + '/public',
         :sessions => false,
         :logging => true,
+        :haml => {}
       }
     end
     

test/haml_test.rb

@@ -178,4 +178,56 @@ context "Haml" do
     
   end
 
+  describe 'Options passed to the HAML interpreter' do
+    setup do
+      Sinatra.application = nil
+    end
+
+    specify 'are empty be default' do
+
+      get '/' do
+        haml 'foo'
+      end
+
+      Haml::Engine.expects(:new).with('foo', {}).returns(stub(:render => 'foo'))
+
+      get_it '/'
+      should.be.ok
+
+    end
+
+    specify 'can be configured by passing :options to haml' do
+
+      get '/' do
+        haml 'foo', :options => {:format => :html4}
+      end
+
+      Haml::Engine.expects(:new).with('foo', {:format => :html4}).returns(stub(:render => 'foo'))
+
+      get_it '/'
+      should.be.ok
+
+    end
+
+    specify 'can be configured using set_option :haml' do
+
+      configure do
+        set_option :haml, :format       => :html4,
+                          :escape_html  => true
+      end
+
+      get '/' do
+        haml 'foo'
+      end
+
+      Haml::Engine.expects(:new).with('foo', {:format => :html4,
+        :escape_html => true}).returns(stub(:render => 'foo'))
+
+      get_it '/'
+      should.be.ok
+
+    end
+
+  end
+
 end