Merge branch 'request/relative_submodules' into 'master'

 Add support for relative submodules

Currently there is no support for submodules where the url starts with ./ or ../, it will fail with an Routing Error.
This is required is you don't want to force a submodule to ssh or http usage.

For a given Repository __http://server/group/root.git__

---

[submodule "sub1"]
	path = sub1
	url = ../submodule.git

Wrong: http://server/group/ __root__ /submodule.git
Correct: http://server/group/submodule.git

---

[submodule "sub2"]
	path = sub2
	url = ../../any/submodule.git

Wrong: http://server/ __group/any__ /submodule.git
Corrent: http://server/any/submodule.git

app/helpers/submodule_helper.rb

@@ -12,6 +12,8 @@ module SubmoduleHelper
 
     if self_url?(url, project)
       return project_path(project), project_tree_path(project, submodule_item.id)
+    elsif relative_self_url?(url)
+      relative_self_links(url, submodule_item.id)
     elsif github_dot_com_url?(url)
       standard_links('github.com', project, submodule_item.id)
     elsif gitlab_dot_com_url?(url)
@@ -36,8 +38,22 @@ module SubmoduleHelper
     url == gitlab_shell.url_to_repo(project)
   end
 
+  def relative_self_url?(url)
+    # (./)?(../repo.git) || (./)?(../../project/repo.git) )
+    url =~ /^((\.\/)?(\.\.\/))(?!(\.\.)|(.*\/)).*\.git\Z/ || url =~ /^((\.\/)?(\.\.\/){2})(?!(\.\.))([^\/]*)\/(?!(\.\.)|(.*\/)).*\.git\Z/
+  end
+
   def standard_links(host, project, commit)
     base = [ 'https://', host, '/', project ].join('')
     return base, [ base, '/tree/', commit ].join('')
   end
+
+  def relative_self_links(url, commit)
+    if url.scan(/(\.\.\/)/).size == 2
+      base = url[/([^\/]*\/[^\/]*)\.git/, 1]
+    else
+      base = [ @project.group.path, '/', url[/([^\/]*)\.git/, 1] ].join('')
+    end
+    return project_path(base), project_tree_path(base, commit)
+  end
 end