The four extensions in one package "extras"

[bowman2001]

Closes #12

[jmooring]

The example from the README contains this:

Hydrogen (H) is the 1^st^ element in the periodic table.

Water (H~2~O) is a liquid.

Water (H~2~O) is a ++transparent++ liquid.

The subscripts are failing.

This works:

x H~2~O

This does not:

x H~2~O x

The Hugo integration bit is here:
gohugoio/hugo#12294

You'll need to change the replacement path in go.mod. That will, of course, go away once this is merged.

[bowman2001]

Yes, @bep, the only difference between Superscript and Subscript are the markers (a single '^' or '~'). All the other variables, functions, or methods only have different names. This redundancy could surly be removed.

The insert doesn’t need to watch out for whitespace and has the same logic as strong emphasis.

But first I need to address the problem @jmooring mentioned. My unit tests did not cover the cases x H~2~O x or x foo^3^bar x until now. They both fail, and I obviously missed something I need to figure out.

[bowman2001]

Sorry for the delay, I had to attend to a lot of changes in my life in the last weeks. Coming month my new full-time Job is going to start.

I want to finish the extras package with the requested changes in the next days.

[bowman2001]

There are new unit tests for the problem @jmooring found, and it's gone. The redundancy in the extensions is also gone. Only the necessary general structures for an inline tag remain which can be used for different tags. I have added a new mark tag because it was so easy: ==marked== -> <mark>marked</mark>.

The configuration follows now the same concept as passthrough without any additional configuration data, as @bep requested.

I also changed config.go and convert.go in my Hugo fork and wrote some integration tests in goldmark_integration_test.go. Everything looks good.

I noticed that I am not as proficient with the Go workflow as I would like. I had to change the module path to my personal repo to integrate.

[jmooring]

To simplify integration testing I am merging this without tagging a release. The repository is still described as "Work in progress".