Allow Project#skip_refs to accept & match regex

* Added rspec tests for #skip_ref?
* Allow regex matching
* Added hints on Project form

app/models/project.rb

@@ -155,7 +155,11 @@ ls -la
   def skip_ref?(ref_name)
     if skip_refs.present?
-      skip_refs.delete(" ").split(",").include?(ref_name)
+      skip_refs.delete(" ").split(",").each do |ref|
+        return true unless ref_name !~ Regexp.new(ref)
+      end
+
+      false
     else
       false
     end

app/views/projects/_form.html.haml

@@ -124,7 +124,9 @@
     .form-group
       = f.label :skip_refs, "Skip refs", class: 'control-label'
       .col-sm-10
-        = f.text_field :skip_refs, class: 'form-control', placeholder: 'branch1, branch2'
+        = f.text_field :skip_refs, class: 'form-control', placeholder: 'branch1, branch2, feature/*'
+        .light
+          You can specify git references to skip CI builds. Accepts strings and regex values
   .form-actions
     = f.submit 'Save changes', class: 'btn btn-save'

spec/models/project_spec.rb

@@ -132,4 +132,21 @@ describe Project do
     it { should include('gitlab-ci-token') }
     it { should include(project.gitlab_url[7..-1]) }
   end
+
+  describe "#skip_ref?" do
+    let(:project) { FactoryGirl.create(:project, skip_refs: "master, develop, feature/.*, hotfix/*") }
+
+    it 'returns true when item is not in list' do
+      expect(project.skip_ref?('someotherstring')).to eq false
+    end
+
+    it 'accepts string values' do
+      expect(project.skip_ref?('master')).to eq true
+    end
+
+    it 'accepts regex values' do
+      expect(project.skip_ref?('feature/some_feature')).to eq true
+      expect(project.skip_ref?('feature/ssh_fix')).to eq true
+    end
+  end
 end