Allow specify baseurl in asets configuration

lib/jekyll/assets_plugin/configuration.rb

@@ -60,6 +60,9 @@ def initialize config = {}
         self.bundles  = [ self.bundles ] if self.bundles.is_a? String
         self.compress = OpenStruct.new(self.compress)
         self.dirname  = self.dirname.gsub(/^\/+|\/+$/, '')
+
+        # if baseurl not given - autoguess base on dirname
+        self.baseurl ||= "/#{self.dirname}/".squeeze '/'
       end
 
       # Returns bundles array with pattern strings converted to RegExps

spec/lib/jekyll/assets_plugin/configuration_spec.rb

@@ -6,6 +6,7 @@ module Jekyll::AssetsPlugin
     let(:defaults) do
       {
         :dirname  => 'assets',
+        :baseurl  => '/assets/',
         :sources  => %w{_assets/javascripts _assets/stylesheets _assets/images},
         :bundles  => %w{app.css app.js **.jpg **.png **.gif}
       }
@@ -19,6 +20,11 @@ module Jekyll::AssetsPlugin
         it { should == defaults[:dirname] }
       end
 
+      context 'assets baseurl' do
+        subject { config.baseurl }
+        it { should == defaults[:baseurl] }
+      end
+
       context 'sources list' do
         subject { config.sources }
         it { should =~ defaults[:sources] }
@@ -53,6 +59,25 @@ module Jekyll::AssetsPlugin
       config.compress.css.should == 'sass'
     end
 
+    context '#baseurl' do
+      it 'should respect explicit overrides' do
+        config = Configuration.new({
+          :dirname => 'foo',
+          :baseurl => '/bar/'
+        })
+
+        config.baseurl.should == '/bar/'
+      end
+
+      it 'should be auto-guessed from dirname' do
+        config = Configuration.new({
+          :dirname => 'foo'
+        })
+
+        config.baseurl.should == '/foo/'
+      end
+    end
+
     context '#js_compressor' do
       context 'when js compressor is given as "uglify"' do
         let(:config){ Configuration.new(:compress => {:js => 'uglify'}) }