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notes/_includes/fix_linenos.html

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{%- comment -%}
This file can be used to fix the HTML produced by Jekyll for highlighted
code with line numbers.
It works with `{% highlight some_language linenos %}...{% endhighlight %}`
and with the Kramdown option to add line numbers to fenced code.
The implementation was 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 highlighting with lie numbers is of the form
`code table`. Jekyll (<= 4.1.1) always wraps the highlighted HTML
with `pre`. This wrapping is not only unnecessary, but also transforms
the conforming HTML produced by Rouge to non-conforming HTML, which
results in HTML validation error reports.
The fix removes the outer `pre` tags whenever they contain the pattern
`<table class="rouge-table">`.
Apart from avoiding HTML validation errors, the fix allows the use of
the [Jekyll layout for compressing HTML](http://jch.penibelst.de),
which relies on `pre` tags not being nested, according to
https://github.com/penibelst/jekyll-compress-html/issues/71#issuecomment-172069842
USAGE
(Any names can be used for `some_var` and `some_language`.)
{% capture some_var %}
{% highlight some_language linenos %}
Some code
{% endhighlight %}
{% endcapture %}
{% include fix_linenos.html code=some_var %}
For code fences:
{% capture some_var %}
```some_language
Some code
```
{% endcapture %}
{% assign some_var = some_var | markdownify %}
{% include fix_linenos.html code=some_var %}
CAVEATS
The above does not work when `Some code` happens to contain the matched string
`<table class="rouge-table">`.
The use of this file overwrites the variable `fix_linenos_code` with `nil`.
{%- endcomment -%}
{% assign fix_linenos_code = include.code %}
{% if fix_linenos_code contains '<table class="rouge-table">' %}
{% assign fix_linenos_code = fix_linenos_code | replace: '<pre class="highlight">', '<pre>' %}
{% assign fix_linenos_code = fix_linenos_code | replace: "<pre><code", "<code" %}
{% assign fix_linenos_code = fix_linenos_code | replace: "</code></pre>", "</code>" %}
{% endif %}
{{ fix_linenos_code }}
{% assign fix_linenos_code = nil %}