https://git.ruby-lang.org/ruby.git/commit/?id=3dacc14fd3

From 3dacc14fd3dded7feda31c195f6bf6c096c91e21 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 1 Jul 2021 05:39:13 +0900
Subject: [ruby/rdoc] Fix links without paths

https://github.com/ruby/rdoc/commit/424bd5db4d
---
 lib/rdoc/markup/to_html.rb            | 2 +-
 test/rdoc/test_rdoc_markup_to_html.rb | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/rdoc/markup/to_html.rb b/lib/rdoc/markup/to_html.rb
index f3dd96e..d3bb8af 100644
--- a/lib/rdoc/markup/to_html.rb
+++ b/lib/rdoc/markup/to_html.rb
@@ -357,7 +357,7 @@ class RDoc::Markup::ToHtml < RDoc::Markup::Formatter https://github.com/ruby/ruby/blob/trunk/lib/rdoc/markup/to_html.rb#L357
        url =~ /\.(gif|png|jpg|jpeg|bmp)$/ then
       "<img src=\"#{url}\" />"
     else
-      if scheme != 'link' and %r%\A((?!https?:).*/)([^/]+)\.(rb|rdoc|md)(?=\z|#)%i =~ url
+      if scheme != 'link' and %r%\A((?!https?:)(?:[^/#]*/)*+)([^/#]+)\.(rb|rdoc|md)(?=\z|#)%i =~ url
         url = "#$1#{$2.tr('.', '_')}_#$3.html#$'"
       end
 
diff --git a/test/rdoc/test_rdoc_markup_to_html.rb b/test/rdoc/test_rdoc_markup_to_html.rb
index aa36fb7..342cf71 100644
--- a/test/rdoc/test_rdoc_markup_to_html.rb
+++ b/test/rdoc/test_rdoc_markup_to_html.rb
@@ -739,6 +739,8 @@ EXPECTED https://github.com/ruby/ruby/blob/trunk/test/rdoc/test_rdoc_markup_to_html.rb#L739
   end
 
   def test_gen_url_rdoc_file
+    assert_equal '<a href="example_rdoc.html">example</a>',
+                 @to.gen_url('example.rdoc', 'example')
     assert_equal '<a href="doc/example_rdoc.html">example</a>',
                  @to.gen_url('doc/example.rdoc', 'example')
     assert_equal '<a href="../ex.doc/example_rdoc.html">example</a>',
@@ -750,6 +752,8 @@ EXPECTED https://github.com/ruby/ruby/blob/trunk/test/rdoc/test_rdoc_markup_to_html.rb#L752
   end
 
   def test_gen_url_md_file
+    assert_equal '<a href="example_md.html">example</a>',
+                 @to.gen_url('example.md', 'example')
     assert_equal '<a href="doc/example_md.html">example</a>',
                  @to.gen_url('doc/example.md', 'example')
     assert_equal '<a href="../ex.doc/example_md.html">example</a>',
@@ -761,6 +765,8 @@ EXPECTED https://github.com/ruby/ruby/blob/trunk/test/rdoc/test_rdoc_markup_to_html.rb#L765
   end
 
   def test_gen_url_rb_file
+    assert_equal '<a href="example_rb.html">example</a>',
+                 @to.gen_url('example.rb', 'example')
     assert_equal '<a href="doc/example_rb.html">example</a>',
                  @to.gen_url('doc/example.rb', 'example')
     assert_equal '<a href="../ex.doc/example_rb.html">example</a>',
-- 
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