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notes/_includes/fix_linenos.html

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{% comment -%}
Fixes the HTML for highlighted code with linenos.
Derived from the workaround provided by Dmitry Hrabrov (DeXP) at
https://github.com/penibelst/jekyll-compress-html/issues/71#issuecomment-188144901
Explanation:
The HTML produced by Rouge with the linenos option matches CSS `code table`.
Jekyll (<= 4.1.1) always wraps the highlighted HTML with `pre`, which is
unnecessary and non-conforming, and leads to validation error reports.
The fix removes the `pre` tags around `_code` whenever it contains the pattern
`<table class="rouge-table">`. This change avoids validation errors, and
allows the use of [Jekyll layout for compressing HTML](http://jch.penibelst.de),
which relies on `pre` tags not being nested.
Usage:
{% capture fix_linenos_code %}{% highlight AnyLanguage linenos %}
Some code
{% endhighlight %}{% endcapture %}{% include fix_linenos.html %}{{ fix_linenos_code }}
Caveats:
The above does not work when `Some code` happens to contain the matched string
`<table class="rouge-table">`.
{%- endcomment %}
{% if fix_linenos_code contains '<table class="rouge-table">' %}
{% assign fix_linenos_code = fix_linenos_code | replace: "<pre><code", "<code" %}
{% assign fix_linenos_code = fix_linenos_code | replace: "</code></pre>", "</code>" %}
{% endif %}