Fix Markdown relative links to files with anchors.

app/helpers/gitlab_markdown_helper.rb

@@ -110,7 +110,7 @@ module GitlabMarkdownHelper
   end
 
   def link_to_ignore?(link)
-    if link =~ /\#\w+/
+    if link =~ /\A\#\w+/
       # ignore anchors like <a href="#my-header">
       true
     else
@@ -122,10 +122,11 @@ module GitlabMarkdownHelper
     ["http://","https://", "ftp://", "mailto:"]
   end
 
-  def rebuild_path(path)
-    path.gsub!(/(#.*)/, "")
+  def rebuild_path(file_path)
+    file_path = file_path.dup
+    file_path.gsub!(/(#.*)/, "")
     id = $1 || ""
-    file_path = relative_file_path(path)
+    file_path = relative_file_path(file_path)
     file_path = sanitize_slashes(file_path)
 
     [

spec/helpers/gitlab_markdown_helper_spec.rb

@@ -584,7 +584,7 @@ describe GitlabMarkdownHelper do
     it "should leave code blocks untouched" do
       allow(helper).to receive(:user_color_scheme_class).and_return(:white)
 
-      target_html = "<pre class=\"code highlight white plaintext\"><code>some code from $40\nhere too\n</code></pre>\n"
+      target_html = "<pre class=\"code highlight white plaintext\"><code>some code from $#{snippet.id}\nhere too\n</code></pre>\n"
 
       expect(helper.markdown("\n    some code from $#{snippet.id}\n    here too\n")).
         to eq(target_html)
@@ -638,6 +638,18 @@ describe GitlabMarkdownHelper do
       expect(markdown(actual)).to match(expected)
     end
 
+    it "should handle relative urls for a file in master with an anchor" do
+      actual = "[GitLab API doc](doc/api/README.md#section)\n"
+      expected = "<p><a href=\"/#{project.path_with_namespace}/blob/#{@ref}/doc/api/README.md#section\">GitLab API doc</a></p>\n"
+      expect(markdown(actual)).to match(expected)
+    end
+
+    it "should not handle relative urls for the current file with an anchor" do
+      actual = "[GitLab API doc](#section)\n"
+      expected = "<p><a href=\"#section\">GitLab API doc</a></p>\n"
+      expect(markdown(actual)).to match(expected)
+    end
+
     it "should handle relative urls for a directory in master" do
       actual = "[GitLab API doc](doc/api)\n"
       expected = "<p><a href=\"/#{project.path_with_namespace}/tree/#{@ref}/doc/api\">GitLab API doc</a></p>\n"