angle brackets in nested lists issue

[harmstyler]

Hi,
I have a markdown file with rather strange formatting. The gfm formatter seems to error on it. I reduced it to the broken element in hopes it becomes easier to see. Then angle brackets with a period inside appears to be the cause.

1. foo
   1. foo  <user.name> bar
2. bash

[hukkin]

Thanks for the issue! I can confirm this happens.

Proper fix would be replacing linkify dependency with a markdown-it-py plugin that correctly parses GFM autolink extension (can be created in this repository). Linkify matches way more than what's required by the GFM spec, and does it in a peculiar way too, e.g.

<!-- This is text only, no link -->

\<user.name>

<!-- This is a link surrounded by angle brackets (brackets are text, not part of the link) -->

<user.name>

<!-- This is a link surrounded by angle brackets (brackets are text, not part of the link) -->

\<https://python.org>

<!-- This is a link only, no surrounding text brackets -->

<https://python.org>

It's not normal that escaping a preceding character that's not part of the (link) syntax itself will invalidate the syntax. There's a chance that markdown-it (javascript) may want to change this behavior but not sure.

Anyway, currently links that are matched by linkify, but are not CommonMark autolinks, will cause issues to mdformat-gfm if they are surrounded by angle brackets.

[hukkin]

This is fixed in mdformat-gfm >=0.4.0. Instead of linkify-it-py we now use a GFM compatible linkifier.

[hukkin]

I've yanked the release, as the new autolink parser was finding GFM autolinks inside image and link labels, which must not be allowed.

[hukkin]

Version 0.4.1 fixes the issue with link and image labels.