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Showing content from https://github.com/django-wiki/django-wiki/issues/1246 below:

Edit section fails when fenced code block contains comments · Issue #1246 · django-wiki/django-wiki · GitHub

^{Originally posted by chrisv2 January 8, 2023}
The following markup will break section editing (due to the # in the fenced code block):

# Section 1
Section 1 Lorem ipsum dolor sit amet

```python
# hello world
print("hello world")
```

# Section 2
Section 2 Lorem ipsum dolor sit amet

When clicking the "edit" link next to "Section 2", the editor should show the following markup:

# Section 2
Section 2 Lorem ipsum dolor sit amet

The editor shows parts of the fenced code block:

# hello world
print("hello world")
```

# Section 2
Section 2 Lorem ipsum dolor sit amet

Actually it is surprisingly hard to create a proper fix for that, as it is not possible to get source line numbers from the markdown parser. Currently, the editsection plugin parses the source itself by using regexes, but that doesn't account for fenced code blocks, and it's probably quite difficult to do this with regex alone. IMHO we could do one of the following:

1. loop over markdown source line by line, detecting headers and start/end of fenced code blocks (and possibly other blocks like HTML)
2. create a block level extension and annotate each h[1-6] with the source line, then find them in the markup

I'm interested in hacking at this, but I'm not sure which is the best approach. Any thoughts?

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