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66 lines
2.2 KiB
HTML
66 lines
2.2 KiB
HTML
{%- comment -%}
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This file can be used to fix the HTML produced by Jekyll for highlighted
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code with line numbers.
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It works with `{% highlight some_language linenos %}...{% endhighlight %}`
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and with the Kramdown option to add line numbers to fenced code.
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The implementation was derived from the workaround provided by
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Dmitry Hrabrov (DeXP) at
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https://github.com/penibelst/jekyll-compress-html/issues/71#issuecomment-188144901
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EXPLANATION
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The HTML produced by Rouge highlighting with lie numbers is of the form
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`code table`. Jekyll (<= 4.1.1) always wraps the highlighted HTML
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with `pre`. This wrapping is not only unnecessary, but also transforms
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the conforming HTML produced by Rouge to non-conforming HTML, which
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results in HTML validation error reports.
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The fix removes the outer `pre` tags whenever they contain the pattern
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`<table class="rouge-table">`.
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Apart from avoiding HTML validation errors, the fix allows the use of
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the [Jekyll layout for compressing HTML](http://jch.penibelst.de),
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which relies on `pre` tags not being nested, according to
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https://github.com/penibelst/jekyll-compress-html/issues/71#issuecomment-172069842
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USAGE
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(Any names can be used for `some_var` and `some_language`.)
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{% capture some_var %}
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{% highlight some_language linenos %}
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Some code
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{% endhighlight %}
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{% endcapture %}
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{% include fix_linenos.html code=some_var %}
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For code fences:
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{% capture some_var %}
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```some_language
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Some code
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```
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{% endcapture %}
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{% assign some_var = some_var | markdownify %}
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{% include fix_linenos.html code=some_var %}
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CAVEATS
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The above does not work when `Some code` happens to contain the matched string
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`<table class="rouge-table">`.
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The use of this file overwrites the variable `fix_linenos_code` with `nil`.
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{%- endcomment -%}
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{% assign fix_linenos_code = include.code %}
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{% if fix_linenos_code contains '<table class="rouge-table">' %}
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{% assign fix_linenos_code = fix_linenos_code | replace: '<pre class="highlight">', '<pre>' %}
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{% assign fix_linenos_code = fix_linenos_code | replace: "<pre><code", "<code" %}
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{% assign fix_linenos_code = fix_linenos_code | replace: "</code></pre>", "</code>" %}
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{% endif %}
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{{ fix_linenos_code }}
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{% assign fix_linenos_code = nil %}
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