Move project header title definition to view in question.

app/helpers/groups_helper.rb

@@ -31,12 +31,12 @@ module GroupsHelper
     end
   end
-  def group_title(group, name, url)
+  def group_title(group, name = nil, url = nil)
+    full_title = link_to(simple_sanitize(group.name), group_path(group))
+    full_title += ' · '.html_safe + link_to(simple_sanitize(name), url) if name
+
     content_tag :span do
-      link_to(
-        simple_sanitize(group.name), group_path(group)
-      ) + ' · '.html_safe +
-        link_to(simple_sanitize(name), url)
+      full_title
     end
   end
 end

app/helpers/projects_helper.rb

@@ -317,41 +317,6 @@ module ProjectsHelper
     @ref || @repository.try(:root_ref)
   end
-  def detect_project_title(project)
-    name, url =
-      if current_controller? 'wikis'
-        ['Wiki', get_project_wiki_path(project)]
-      elsif current_controller? 'project_members'
-        ['Members', namespace_project_project_members_path(project.namespace, project)]
-      elsif current_controller? 'labels'
-        ['Labels', namespace_project_labels_path(project.namespace, project)]
-      elsif current_controller? 'members'
-        ['Members', project_files_path(project)]
-      elsif current_controller? 'commits'
-        ['Commits', project_commits_path(project)]
-      elsif current_controller? 'graphs'
-        ['Graphs', namespace_project_graph_path(project.namespace, project, current_ref)]
-      elsif current_controller? 'network'
-        ['Network', namespace_project_network_path(project.namespace, project, current_ref)]
-      elsif current_controller? 'milestones'
-        ['Milestones', namespace_project_milestones_path(project.namespace, project)]
-      elsif current_controller? 'snippets'
-        ['Snippets', namespace_project_snippets_path(project.namespace, project)]
-      elsif current_controller? 'issues'
-        ['Issues', namespace_project_issues_path(project.namespace, project)]
-      elsif current_controller? 'merge_requests'
-        ['Merge Requests', namespace_project_merge_requests_path(project.namespace, project)]
-      elsif current_controller? 'tree', 'blob'
-        ['Files', project_files_path(project)]
-      elsif current_path? 'projects#activity'
-        ['Activity', activity_project_path(project)]
-      else
-        [nil, nil]
-      end
-
-    project_title(project, name, url)
-  end
-
   private
   def filename_path(project, filename)

app/views/groups/milestones/_header_title.html.haml

+- header_title group_title(@group, "Milestones", group_milestones_path(@group))

app/views/groups/milestones/show.html.haml

 - page_title @group_milestone.title, "Milestones"
+= render "header_title"
+
 %h4.page-title
   .issue-box{ class: "issue-box-#{@group_milestone.closed? ? 'closed' : 'open'}" }
     - if @group_milestone.closed?

app/views/layouts/dashboard.html.haml

 - page_title    "Dashboard"
-- unless @header_title
-  - header_title  "Dashboard", root_path
+- header_title  "Dashboard", root_path unless header_title
 - sidebar       "dashboard"
 = render template: "layouts/application"

app/views/layouts/group.html.haml

 - page_title    @group.name
-- unless @header_title
-  - header_title  @group.name, group_path(@group)
-- sidebar       "group" unless sidebar
+- header_title  group_title(@group) unless header_title
+- sidebar       "group"             unless sidebar
 = render template: "layouts/application"

app/views/layouts/group_settings.html.haml

 - page_title    "Settings"
+- header_title group_title(@group, "Settings", edit_group_path(@group))
 - sidebar       "group_settings"
 = render template: "layouts/group"

app/views/layouts/profile.html.haml

 - page_title    "Profile Settings"
-- unless @header_title
-  - header_title  "Profile Settings", profile_path
+- header_title  "Profile Settings", profile_path unless header_title
 - sidebar       "profile"
 = render template: "layouts/application"

app/views/layouts/project.html.haml

 - page_title    @project.name_with_namespace
-- header_title  detect_project_title(@project)
-- sidebar       "project" unless sidebar
+- header_title  project_title(@project) unless header_title
+- sidebar       "project"               unless sidebar
 - content_for :scripts_body_top do
   - if current_user

app/views/layouts/project_settings.html.haml

 - page_title  "Settings"
+- header_title project_title(@project, "Settings", edit_project_path(@project))
 - sidebar     "project_settings"
 = render template: "layouts/project"

app/views/projects/activity.html.haml

 - page_title "Activity"
+- header_title project_title(@project, "Activity", activity_project_path(@project))
+
 = render 'projects/activity'

app/views/projects/blame/show.html.haml

 - page_title "Blame", @blob.path, @ref
+- header_title project_title(@project, "Files", project_files_path(@project))
+
 %h3.page-title Blame view
 #tree-holder.tree-holder

app/views/projects/blob/_header_title.html.haml

+- header_title project_title(@project, "Files", project_files_path(@project))

app/views/projects/blob/edit.html.haml

 - page_title "Edit", @blob.path, @ref
+= render "header_title"
+
 .file-editor
   %ul.center-top-menu.no-bottom.js-edit-mode
     %li.active

app/views/projects/blob/new.html.haml

+- page_title "New File", @path.presence, @ref
+= render "header_title"
+
 .gray-content-block.top-block
   Create a new file or
   = link_to 'upload', '#modal-upload-blob',

app/views/projects/blob/show.html.haml

 - page_title @blob.path, @ref
+= render "header_title"
 = render 'projects/last_push'

app/views/projects/branches/index.html.haml

 - page_title "Branches"
+= render "projects/commits/header_title"
 = render "projects/commits/head"
 .gray-content-block
   .pull-right

app/views/projects/branches/new.html.haml

 - page_title "New Branch"
+= render "projects/commits/header_title"
+
 - if @error
   .alert.alert-danger
     %button{ type: "button", class: "close", "data-dismiss" => "alert"} ×

app/views/projects/commit/show.html.haml

 - page_title "#{@commit.title} (#{@commit.short_id})", "Commits"
+= render "projects/commits/header_title"
 = render "commit_box"
 = render "projects/diffs/diffs", diffs: @diffs, project: @project
 = render "projects/notes/notes_with_form", view: params[:view]

app/views/projects/commits/_header_title.html.haml

+- header_title project_title(@project, "Commits", project_commits_path(@project))