Resolve "Add Xcode Button in UI"

app/helpers/projects_helper.rb

@@ -238,6 +238,14 @@ module ProjectsHelper
     "git push --set-upstream #{repository_url}/$(git rev-parse --show-toplevel | xargs basename).git $(git rev-parse --abbrev-ref HEAD)"
   end
 
+  def show_xcode_link?(project = @project)
+    browser.platform.mac? && project.repository.xcode_project?
+  end
+
+  def xcode_uri_to_repo(project = @project)
+    "xcode://clone?repo=#{CGI.escape(default_url_to_repo(project))}"
+  end
+
   private
 
   def get_project_nav_tabs(project, current_user)

app/views/projects/_home_panel.html.haml

@@ -42,6 +42,10 @@
           .project-clone-holder
             = render "shared/clone_panel"
 
+          - if show_xcode_link?(@project)
+            .project-action-button.project-xcode.inline
+              = render "projects/buttons/xcode_link"
+
         - if current_user
           - if can?(current_user, :download_code, @project)
             = render 'projects/buttons/download', project: @project, ref: @ref

app/views/projects/buttons/_xcode_link.html.haml

+%a.btn.btn-default{ href: xcode_uri_to_repo(@project) }
+  = _("Open in Xcode")

changelogs/unreleased/45820-add-xcode-link.yml

+---
+title: Add Open in Xcode link for xcode repositories
+merge_request:
+author:
+type: added

spec/helpers/projects_helper_spec.rb

@@ -435,4 +435,46 @@ describe ProjectsHelper do
       expect(helper.send(:git_user_name)).to eq('John \"A\" Doe53')
     end
   end
+
+  describe 'show_xcode_link' do
+    let!(:project) { create(:project) }
+    let(:mac_ua) { 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36' }
+    let(:ios_ua) { 'Mozilla/5.0 (iPad; CPU OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3' }
+
+    context 'when the repository is xcode compatible' do
+      before do
+        allow(project.repository).to receive(:xcode_project?).and_return(true)
+      end
+
+      it 'returns false if the visitor is not using macos' do
+        allow(helper).to receive(:browser).and_return(Browser.new(ios_ua))
+
+        expect(helper.show_xcode_link?(project)).to eq(false)
+      end
+
+      it 'returns true if the visitor is using macos' do
+        allow(helper).to receive(:browser).and_return(Browser.new(mac_ua))
+
+        expect(helper.show_xcode_link?(project)).to eq(true)
+      end
+    end
+
+    context 'when the repository is not xcode compatible' do
+      before do
+        allow(project.repository).to receive(:xcode_project?).and_return(false)
+      end
+
+      it 'returns false if the visitor is not using macos' do
+        allow(helper).to receive(:browser).and_return(Browser.new(ios_ua))
+
+        expect(helper.show_xcode_link?(project)).to eq(false)
+      end
+
+      it 'returns false if the visitor is using macos' do
+        allow(helper).to receive(:browser).and_return(Browser.new(mac_ua))
+
+        expect(helper.show_xcode_link?(project)).to eq(false)
+      end
+    end
+  end
 end