Open Source Encore: Jekyll documentation improvements for Include/Exclude

While working on this very website, I have come to learn more about Jekyll and Liquid as a result of setting up GitHub Pages (the mechanism through which the site is hosted) and using Liquid to generate the landing page with the list of contents that are available on the site.

I haven't quite learn enough, though, in a sense, because while I did learn that GitHub Pages ships with an outdated version of Jekyll and Liquid (see the page https://pages.github.com/versions for information - both are one major version behind), I wasn't sure whether the exclude option I had added to _config.yml to tell Jekyll to include index.html (and thus "nested" GitHub Pages) in the submodules that make up the contents of the site would replace or augment the default exclusion list in Jekyll.

I turned to the Jekyll documentation site for answers and when I couldn't get any, to the Jekyll repository where I posted this issue: https://github.com/jekyll/jekyll/issues/9372

A helpful maintainer came back and explained that in Jekyll 3, the exclusion list is replaced whereas in Jekyll 4, it is appended to via this configuration option.

This way a slightly unfortunate information for me to learn as I was hoping for the Jekyll 4 behavior (which makes sense to me) to be what is going to happen on GitHub Pages, but that uses Jekyll 3 so I will need to add the default exclusion list to my _config.yml to make sure I don't inadvertedly include something in my build I didn't mean to when I added that custom exclude line.

In any case, this answer I felt was worth capturing in the Jekyll documentation so I set out to do just that.

I cloned the Jekyll repository and followed the steps outlined by the maintainer in his comment on my issue. Later on I've learnt they were helping me out by quoting bits of the macOS set up guide at https://jekyllrb.com/docs/installation/macos as I was coming across issues this guide explains how to fix:

• bundle install would fail with this error message:

  Your user account isn't allowed to install to the system RubyGems

  I knew something was going to go wrong since I was using the macOS built in Ruby install and seeing how well things go with the built in Git or outdated shell utilities on macOS, I was sure this wouldn't be much better.

  I found a suggestion on how to work around this on Stack Overflow: https://stackoverflow.com/a/49719722/2715716

• bundle install --path vendor/bundle worked and let me continue to the next step as outlined by the maintainer

• bundle exec jekyll serve -s docs -d docs/_site --livereload would fail with this error message:

  bundler: failed to load command: jekyll (/Users/tom/Desktop/jekyll/vendor/bundle/ruby/2.6.0/bin/jekyll)

  I did more online research and came across another Stack Overflow post at https://stackoverflow.com/a/70916831/2715716 but this did not make any difference.

• I found a Jekyll repository issue about the problems I was having: https://github.com/jekyll/jekyll/issues/8784

  In this issue, a Jekyll user figured the issues out and captured his solution. The same maintainer that was helping him asked him to contribute this to the Jekyll docs which he did and that's how the guide I mentioned before was born. Also the contributor's blog post on the same topic which predated it can be found here: https://www.moncefbelyamani.com/how-to-install-jekyll-on-a-mac-the-easy-way/ From this point on I followed https://jekyllrb.com/docs/installation/macos/

• brew install chruby ruby-install xz

  chruby is a Ruby version manager similar in what it does to something like NVM.

• ruby-install ruby 3.1.3

  I installed a more recent Ruby version (with a major version bump compared to the one that ships with macOS).

• source $(brew --prefix)/opt/chruby/share/chruby/chruby.sh

  This brings the chruby command to the context of the shell so it can be used and called to switch Ruby versions as ruby-install installed the more recent version of Ruby but it still wasn't the default one.

• chruby ruby-3.1.3

  And now it was!

• ruby -v

  As scientifically confirmed.

• bundle install

  We're back at the beginning now but with proper setup so this command passes even without the hacky vendor switch!

• bundle exec jekyll serve -s docs -d docs/_site --livereload

  And off we go serving the site. It runs on - http://127.0.0.1:4000/ and the Configuration Options page I was interested in editing was at http://127.0.0.1:4000/docs/configuration/options/ and is live on https://jekyllrb.com/docs/configuration/options.

The backing file for this page is docs/_docs/configuration/options.md but it uses data from docs/_data/config_options/global.yml so I opened that file and pretty much just adjusted the HTML there with my prose.

Saving the files automatically reloads the page in the browser as expected so testing everything was fine was super easy.

After I was satistied with my changes, I opened a PR to the Jekyll project to solve the issue I've originally raised:

https://github.com/jekyll/jekyll/pull/9376