1 files changed, 33 insertions, 21 deletions
diff --git a/app/helpers/submodule_helper.rb b/app/helpers/submodule_helper.rb
index 06ea3dd8a81..959178c47d7 100644
--- a/app/helpers/submodule_helper.rb
+++ b/app/helpers/submodule_helper.rb
@@ -6,19 +6,19 @@ module SubmoduleHelper
   VALID_SUBMODULE_PROTOCOLS = %w[http https git ssh].freeze
 
   # links to files listing for submodule if submodule is a project on this server
-  def submodule_links(submodule_item, ref = nil, repository = @repository)
-    repository.submodule_links.for(submodule_item, ref)
+  def submodule_links(submodule_item, ref = nil, repository = @repository, diff_file = nil)
+    repository.submodule_links.for(submodule_item, ref, diff_file)
   end
 
-  def submodule_links_for_url(submodule_item_id, url, repository)
-    return [nil, nil] unless url
+  def submodule_links_for_url(submodule_item_id, url, repository, old_submodule_item_id = nil)
+    return [nil, nil, nil] unless url
 
     if url == '.' || url == './'
       url = File.join(Gitlab.config.gitlab.url, repository.project.full_path)
     end
 
     if url =~ %r{([^/:]+)/([^/]+(?:\.git)?)\Z}
-      namespace, project = $1, $2
+      namespace, project = Regexp.last_match(1), Regexp.last_match(2)
       gitlab_hosts = [Gitlab.config.gitlab.url,
                       Gitlab.config.gitlab_shell.ssh_path_prefix]
 
@@ -34,21 +34,24 @@ module SubmoduleHelper
       project.sub!(/\.git\z/, '')
 
       if self_url?(url, namespace, project)
-        [url_helpers.namespace_project_path(namespace, project),
-         url_helpers.namespace_project_tree_path(namespace, project, submodule_item_id)]
+        [
+          url_helpers.namespace_project_path(namespace, project),
+          url_helpers.namespace_project_tree_path(namespace, project, submodule_item_id),
+          (url_helpers.namespace_project_compare_path(namespace, project, to: submodule_item_id, from: old_submodule_item_id) if old_submodule_item_id)
+        ]
       elsif relative_self_url?(url)
-        relative_self_links(url, submodule_item_id, repository.project)
+        relative_self_links(url, submodule_item_id, old_submodule_item_id, repository.project)
       elsif gist_github_dot_com_url?(url)
         gist_github_com_tree_links(namespace, project, submodule_item_id)
       elsif github_dot_com_url?(url)
-        github_com_tree_links(namespace, project, submodule_item_id)
+        github_com_tree_links(namespace, project, submodule_item_id, old_submodule_item_id)
       elsif gitlab_dot_com_url?(url)
-        gitlab_com_tree_links(namespace, project, submodule_item_id)
+        gitlab_com_tree_links(namespace, project, submodule_item_id, old_submodule_item_id)
       else
-        [sanitize_submodule_url(url), nil]
+        [sanitize_submodule_url(url), nil, nil]
       end
     else
-      [sanitize_submodule_url(url), nil]
+      [sanitize_submodule_url(url), nil, nil]
     end
   end
 
@@ -79,22 +82,30 @@ module SubmoduleHelper
     url.start_with?('../', './')
   end
 
-  def gitlab_com_tree_links(namespace, project, commit)
+  def gitlab_com_tree_links(namespace, project, commit, old_commit)
     base = ['https://gitlab.com/', namespace, '/', project].join('')
-    [base, [base, '/-/tree/', commit].join('')]
+    [
+      base,
+      [base, '/-/tree/', commit].join(''),
+      ([base, '/-/compare/', old_commit, '...', commit].join('') if old_commit)
+    ]
   end
 
   def gist_github_com_tree_links(namespace, project, commit)
     base = ['https://gist.github.com/', namespace, '/', project].join('')
-    [base, [base, commit].join('/')]
+    [base, [base, commit].join('/'), nil]
   end
 
-  def github_com_tree_links(namespace, project, commit)
+  def github_com_tree_links(namespace, project, commit, old_commit)
     base = ['https://github.com/', namespace, '/', project].join('')
-    [base, [base, '/tree/', commit].join('')]
+    [
+      base,
+      [base, '/tree/', commit].join(''),
+      ([base, '/compare/', old_commit, '...', commit].join('') if old_commit)
+    ]
   end
 
-  def relative_self_links(relative_path, commit, project)
+  def relative_self_links(relative_path, commit, old_commit, project)
     relative_path = relative_path.rstrip
     absolute_project_path = "/" + project.full_path
 
@@ -107,7 +118,7 @@ module SubmoduleHelper
     target_namespace_path = File.dirname(submodule_project_path)
 
     if target_namespace_path == '/' || target_namespace_path.start_with?(absolute_project_path)
-      return [nil, nil]
+      return [nil, nil, nil]
     end
 
     target_namespace_path.sub!(%r{^/}, '')
@@ -116,10 +127,11 @@ module SubmoduleHelper
     begin
       [
         url_helpers.namespace_project_path(target_namespace_path, submodule_base),
-        url_helpers.namespace_project_tree_path(target_namespace_path, submodule_base, commit)
+        url_helpers.namespace_project_tree_path(target_namespace_path, submodule_base, commit),
+        (url_helpers.namespace_project_compare_path(target_namespace_path, submodule_base, to: commit, from: old_commit) if old_commit)
       ]
     rescue ActionController::UrlGenerationError
-      [nil, nil]
+      [nil, nil, nil]
     end
   end