Deprecate tidy

[Christopher Brown]

Try to find an alternative to tidy.

It's only used in one place, in the extract_metadata function, to sanitize the metadata XML.

macOS comes with an old version (2006-10-31) of tidy:

/usr/bin/tidy -v

HTML Tidy for Mac OS X released on 31 October 2006 - Apple Inc. build 16.4

so for the most part it does work, but tidy is finicky and opinionated and not exactly stable.

[9mido]

Not sure but here are some ideas:

https://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags

https://stackoverflow.com/questions/4680143/how-to-parse-xml-using-shellscript

https://docs.raku.org/language/grammars