diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 7503437c..394e05ae 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -502,7 +502,7 @@ module ApplicationHelper
 
     @parsed_headings = []
     text = parse_non_pre_blocks(text) do |text|
-      [:parse_inline_attachments, :parse_wiki_links, :parse_redmine_links, :parse_headings].each do |method_name|
+      [:parse_inline_attachments, :parse_wiki_links, :parse_redmine_links, :parse_headings, :parse_relative_urls].each do |method_name|
         send method_name, text, project, obj, attr, only_path, options
       end
     end
@@ -543,6 +543,41 @@ module ApplicationHelper
     parsed
   end
 
+  RELATIVE_LINK_RE = %r{
+    <a
+    (?:
+      (\shref=
+        (?:                         # the href and link
+          (?:'(\/[^>]+?)')|
+          (?:"(\/[^>]+?)")
+        )
+      )|
+      [^>]
+    )*
+    >
+    [^<]*?<\/a>                     # content and closing link tag.
+  }x unless const_defined?(:RELATIVE_LINK_RE)
+
+  def parse_relative_urls(text, project, obj, attr, only_path, options)
+    return if only_path
+    text.gsub!(RELATIVE_LINK_RE) do |m|
+      href, relative_url = $1, $2 || $3
+      next m unless href.present?
+      if defined?(request) && request.present?
+        # we have a request!
+        protocol, host_with_port = request.protocol, request.host_with_port
+      elsif @controller
+        # use the same methods as url_for in the Mailer
+        url_opts = @controller.class.default_url_options
+        next m unless url_opts && url_opts[:protocol] && url_opts[:host]
+        protocol, host_with_port = "#{url_opts[:protocol]}://", url_opts[:host]
+      else
+        next m
+      end
+      m.sub href, " href=\"#{protocol}#{host_with_port}#{relative_url}\""
+    end
+  end
+
   def parse_inline_attachments(text, project, obj, attr, only_path, options)
     # when using an image link, try to use an attachment, if possible
     if options[:attachments] || (obj && obj.respond_to?(:attachments))
diff --git a/test/unit/helpers/application_helper_test.rb b/test/unit/helpers/application_helper_test.rb
index 48c99c05..8c9af006 100644
--- a/test/unit/helpers/application_helper_test.rb
+++ b/test/unit/helpers/application_helper_test.rb
@@ -27,6 +27,10 @@ class ApplicationHelperTest < ActionView::TestCase
     super
   end
 
+  def request
+    @request ||= ActionController::TestRequest.new
+  end
+
   context "#link_to_if_authorized" do
     context "authorized user" do
       should "be tested"
@@ -144,6 +148,34 @@ RAW
     to_test.each { |text, result| assert_equal "<p>#{result}</p>", textilizable(text) }
   end
 
+  def test_textile_relative_to_full_links_in_a_controller
+    # we have a request here
+    {
+      # shouldn't change non-relative links
+      'This is a "link":http://foo.bar' => 'This is a <a href="http://foo.bar" class="external">link</a>',
+      'This is an intern "link":/foo/bar' => 'This is an intern <a href="http://test.host/foo/bar">link</a>',
+      'This is an intern "link":/foo/bar and an extern "link":http://foo.bar' => 'This is an intern <a href="http://test.host/foo/bar">link</a> and an extern <a href="http://foo.bar" class="external">link</a>',
+    }.each { |text, result| assert_equal "<p>#{result}</p>", textilizable(text, :only_path => false) }
+  end
+
+  def test_textile_relative_to_full_links_in_the_mailer
+    # we don't a request here
+    undef request
+    # mimic the mailer default_url_options
+    @controller.class.class_eval {
+      def self.default_url_options
+        ::Mailer.default_url_options
+      end
+    }
+
+    {
+      # shouldn't change non-relative links
+      'This is a "link":http://foo.bar' => 'This is a <a href="http://foo.bar" class="external">link</a>',
+      'This is an intern "link":/foo/bar' => 'This is an intern <a href="http://localhost:3000/foo/bar">link</a>',
+      'This is an intern "link":/foo/bar and an extern "link":http://foo.bar' => 'This is an intern <a href="http://localhost:3000/foo/bar">link</a> and an extern <a href="http://foo.bar" class="external">link</a>',
+    }.each { |text, result| assert_equal "<p>#{result}</p>", textilizable(text, :only_path => false) }
+  end
+
   def test_redmine_links
     issue_link = link_to('#3', {:controller => 'issues', :action => 'show', :id => 3},
                                :class => 'issue status-1 priority-1 overdue', :title => 'Error 281 when updating a recipe (New)')