42 lines
1.9 KiB
Markdown
42 lines
1.9 KiB
Markdown
# What I did
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Upgraded from 3.20180105 to 3.20180228 (from pkgsrc).
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No change to installed Text::Markdown::Discount (0.11nb4 from pkgsrc, using upstream's bundled Discount library).
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# What I expected to happen
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Markdown-style links to continue being rendered as before.
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# What actually happened
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Markdown-style links stopped being links.
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Instead, they render the part in square brackets as ordinary text.
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# Proximate cause
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In [f46e429](http://source.ikiwiki.branchable.com/?p=source.git;a=commitdiff;h=f46e429d96ead32943cb2670d7686df8c77de361), if I comment out the `MKD_GITHUBTAGS` if block, the problem goes away.
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# Further causes and possible solutions
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Some guesses:
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- Sufficiently old versions of the Discount library may break when passed unrecognized flags, in which case ikiwiki might want to version-check before passing flags
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- The version of the Discount library bundled with upstream Text::Markdown::Discount may be extremely old, in which case pkgsrc might want to make it depend instead on an external Discount package
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> This appears to be because `MKD_GITHUBTAGS` and `MKD_LATEX` both have numeric values that
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> were previously used for the internal flag `IS_LABEL`, which strips HTML (its value has
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> changed a couple of times).
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>
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> Having thought about this a bit, I realise I can probe for the values of these flags by
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> processing HTML that should have different results with the flag set or unset, which
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> would be safer than just blindly using them.
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>
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> Orthogonally, pkgsrc should probably use an up-to-date version of Discount, and
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> [we already know that Text::Markdown::Discount needs updating](https://rt.cpan.org/Public/Bug/Display.html?id=124188).
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> --[[smcv]]
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>> This should be [[fixed|done]] in current git. The mdwn module now
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>> detects what your version of Discount supports by trying several
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>> short HTML fragments that render differently under the different
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>> flags. --[[smcv]]
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