add users search results to global search

app/services/search/global_service.rb

@@ -23,7 +23,7 @@ module Search
 
     def allowed_scopes
       strong_memoize(:allowed_scopes) do
-        %w[issues merge_requests milestones]
+        %w[issues merge_requests milestones users]
       end
     end
 

app/views/search/_category.html.haml

@@ -78,3 +78,8 @@
           = _("Milestones")
           %span.badge.badge-pill
             = limited_count(@search_results.limited_milestones_count)
+      %li{ class: active_when(@scope == 'users') }
+        = link_to search_filter_path(scope: 'users') do
+          Users
+          %span.badge.badge-pill
+            = limited_count(@search_results.limited_users_count)

app/views/search/results/_user.html.haml

+%ul.content-list
+  %li
+    .avatar-cell.d-none.d-sm-block
+      = user_avatar(user: user, user_name: user.name, css_class: 'd-none d-sm-inline avatar s40')
+    .user-info
+      = link_to user_path(user), class: 'd-none d-sm-inline' do
+        .item-title= user.name
+        .cgray= user.to_reference

lib/gitlab/search_results.rb

@@ -32,6 +32,8 @@ module Gitlab
                      merge_requests.page(page).per(per_page)
                    when 'milestones'
                      milestones.page(page).per(per_page)
+                   when 'users'
+                     users.page(page).per(per_page)
                    else
                      Kaminari.paginate_array([]).page(page).per(per_page)
                    end
@@ -71,6 +73,12 @@ module Gitlab
     end
     # rubocop: enable CodeReuse/ActiveRecord
 
+    # rubocop:disable CodeReuse/ActiveRecord
+    def limited_users_count
+      @limited_users_count ||= users.limit(count_limit).count
+    end
+    # rubocop:enable CodeReuse/ActiveRecord
+
     def single_commit_result?
       false
     end
@@ -129,6 +137,12 @@ module Gitlab
     end
     # rubocop: enable CodeReuse/ActiveRecord
 
+    def users
+      return [] unless Ability.allowed?(current_user, :read_users_list)
+
+      UsersFinder.new(current_user, search: query).execute
+    end
+
     def default_scope
       'projects'
     end

spec/features/global_search_spec.rb

@@ -25,4 +25,22 @@ describe 'Global search' do
       expect(page).to have_selector('.gl-pagination .next')
     end
   end
+
+  describe 'users search' do
+    it 'shows the found user under the Users tab' do
+      create(:user, username: 'gob_bluth', name: 'Gob Bluth')
+
+      visit dashboard_projects_path
+
+      fill_in 'search', with: 'gob'
+      click_button 'Go'
+
+      expect(page).to have_content('Users 1')
+
+      click_on('Users 1')
+
+      expect(page).to have_content('Gob Bluth')
+      expect(page).to have_content('@gob_bluth')
+    end
+  end
 end

spec/lib/gitlab/search_results_spec.rb

@@ -121,6 +121,18 @@ describe Gitlab::SearchResults do
         results.objects('issues')
       end
     end
+
+    describe '#users' do
+      it 'returns an empty array when the current_user is not allowed to read users list' do
+        expect(results.objects('users')).to be_empty
+      end
+
+      it 'calls the UsersFinder' do
+        expect(UsersFinder).to receive(:new).with(user, search: 'foo').and_call_original
+
+        results.objects('users')
+      end
+    end
   end
 
   it 'does not list issues on private projects' do