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Leading whitespace removed in code blocks with syntax highlighting #1021

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rikedyp opened this issue Oct 4, 2022 · 2 comments · May be fixed by jupyter/nbconvert#2203
Open

Leading whitespace removed in code blocks with syntax highlighting #1021

rikedyp opened this issue Oct 4, 2022 · 2 comments · May be fixed by jupyter/nbconvert#2203

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@rikedyp
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rikedyp commented Oct 4, 2022

Leading whitespaces in codeblocks are removed if syntax highlighting is done. Seemingly regardless of the language used. It is common to want 6 spaces denoting input lines in APL. However, if I use APL syntax highlighting, these spaces are removed. Non-breaking spaces or additional newlines do not help.

Here is a test notebook rendered with nbviewer: https://nbviewer.org/gist/rikedyp/59230d88565c3459d88230b8f2e3c256

And source as a GitHub gist: https://gist.github.com/rikedyp/59230d88565c3459d88230b8f2e3c256
@peytondmurray
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peytondmurray commented Jan 1, 2025 •
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I'm taking a look at this now. It seems like this is likely an issue with the html output of nbconvert. Here's the same notebook converted to PDF, with the spaces preserved as expected:

Image

Confirmed this is not a problem with mistune itself (both code blocks correctly preserve whitespace whether they use apl syntax highlighting or not):

Image

@peytondmurray peytondmurray linked a pull request Jan 6, 2025 that will close this issue
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@peytondmurray
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I tracked this down to an option to strip the input when the lexer is initialized in nbconvert. It's been this way for at least the last 10 years, potentially since the beginning, but I'm not sure if it's needed. Anyway, there's a PR up for this here: jupyter/nbconvert#2203.

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Prevent leading whitespace in markdown code blocks from being stripped peytondmurray/nbconvert
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@rikedyp @peytondmurray