Links get incorrectly linkified twice

[frerich]

What version of Hugo are you using (hugo version)?

$ hugo version
Hugo Static Site Generator v0.60.0-F2DEA9B0/extended darwin/amd64 BuildDate: 2019-11-27T10:16:12Z

Does this issue reproduce with the latest release?

Yes.

How to reproduce

1. Create a new site

   $ ./hugo-0.60.0 new site mysite
   Congratulations! Your new Hugo site is created in /tmp/mysite.
   ...
   $ cd mysite
   

2. Create a content file with two links; one in plain text and one using the []() markup:

   $ echo 'Go to [http://www.example.com](www.example.com) or http://www.example.com.' > content/_index.md
   

3. Create a trivial layout for the home page:

   $ echo '{{ .Content }}' > layouts/index.html
   

4. Build the web page

   $ hugo
   

Expected result

The same HTML code was was produced with Hugo v0.59.1 should be generated, i.e. I expect:

$  cat public/index.html
<p>Go to <a href="www.example.com">http://www.example.com</a> or <a href="http://www.example.com">http://www.example.com</a>.</p>

Note that both links yield the same HTML.

Observed result

With Hugo 0.60.0, the first link is marked up twice, i.e. I get an extra <a> element:

$ cat public/index.html
<p>Go to <a href="www.example.com"><a href="http://www.example.com">http://www.example.com</a></a> or <a href="http://www.example.com">http://www.example.com</a>.</p>

Additional notes

The issue can be mitigated somewhat by disabling the markup.goldmark.extensions.linkify option. However, this also disabled linkification of normal links, i..e you get

$ cat public/index.html
<p>Go to <a href="www.example.com">http://www.example.com</a> or http://www.example.com.</p>

[bep]

yuin/goldmark#41

[github-actions]

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