Option to skip adding <pre><code> to highlighted code

[andersk]

Context

When using the highlight option to provide a custom syntax highlighter, markdown-it-py wraps the HTML output of the highlighter in <pre><code> unless it already starts with <pre:

markdown-it-py/markdown_it/renderer.py

Line 270 in 73a0147

if highlighted.startswith("<pre"):

But that heuristic fails for pygments.highlight, whose output does not begin with <pre:

>>> pygments.highlight('print("hello")', pygments.lexers.get_lexer_by_name("python"), pygments.formatters.HtmlFormatter())
'<div class="highlight"><pre><span></span><span class="nb">print</span><span class="p">(</span><span class="s2">&quot;hello&quot;</span><span class="p">)</span>\n</pre></div>\n'

So markdown-it-py turns this into <pre><code><div class="highlight"><pre>…</pre></div></code></pre>, and existing CSS themes for Pygments need to be rewritten to account for the unnecessarily duplicated <pre>.

Proposal

Can we have an option to skip adding <pre><code> that’s not subject to the heuristic?

Tasks and updates

No response

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[pydsigner]

An alternative could be to subclass RendererHTML and override fence():

class CustomRendererHTML(RendererHTML):
    def fence(self, tokens: Sequence[Token], idx: int, options: OptionsDict, env: EnvType) -> str:
        token = tokens[idx]
        info = unescapeAll(token.info).strip() if token.info else ''
        langName = info.split(maxsplit=1)[0] if info else ''

        if options.highlight:
            return options.highlight(
                token.content, langName, ''
            ) or escapeHtml(token.content)

        return escapeHtml(token.content)

Then this class can be selected to get the desired behavior: markdown_it.MarkdownIt(renderer_cls=CustomRendererHTML)

[ZeroAurora]

Upvoting this for my meeting this problem. Also, "highlight" is something that is almost undocumented. Maybe it needs more attention.