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+---
+type: article
+title: Using SASS files from Ruby gems with Jekyll
+tags: ["Jekyll"]
+article_header:
+  type: overlay
+  theme: dark
+  background_color: "#363649"
+  background_image:
+    src: assets/img/posts/2024-02/pexels-jessica-lewis-thepaintedsquare-583847.jpg
+    alignment: 61%
+---
+
+This blog, as well as my other static websites, are all built using [Jekyll][jekyll].
+It's a great tool, and really easy to work with, because it takes care of related build steps
+like compiling your SCSS sources to CSS.
+While doing some refactoring, I wanted to switch from using a pre-built version of the
+[Bootstrap CSS framework][bootstrap] to building it from its SCSS source.
+
+This involves three things (as outlined in the [Bootstrap documentation][bootstrap-build-docs]):
+
+1. Getting the Bootstrap SCSS files
+2. Turning the SCSS files into pure CSS
+3. Transforming the resulting CSS files using Autoprefixer to add vendor prefixes
+
+### How to: Build Bootstrap from source using Jekyll
+
+As described by [this blog post][blog-bootstrap-jekyll], that is quite easy:
+
+1. Copy all SCSS files from Bootstrap into your source repository.
+2. Use the [jekyll-sass-converter] plugin. As its already bundled with Jekyll by default, we don't have to do anything special.
+3. Use the [jekyll-autoprefixer] plugin.
+
+Well... that's good, except for the part number 1 _"Copy all SCSS files from Bootstrap"_.
+Isn't that what we have package managers for?
+There already is an official [bootstrap rubygem][bootstrap-gem], so preferably I would like to use that.
+Just add it to your `Gemfile`, and reference it in your `_config.yml`:
+
+```ruby
+# Gemfile
+gem "bootstrap", "~> 5.3.2"
+```
+
+```yaml
+# _config.yml
+sass:
+  load_paths:
+    - ???
+```
+
+...but how to actually reference the `bootstrap` gem in your `_config.yml`?
+
+Turns out that Jekyll does not have a built-in facility for referencing files from Gems directly,
+so I just wrote a [small Jekyll plugin][jekyll-gem-resolver] that allows me to do just that:
+
+```yaml
+# _config.yml
+sass:
+  load_paths:
+    - 'gem:bootstrap/assets/stylesheets'
+
+gem_resolver:
+  transform: # Specify where gem references might be found 
+    - sass.load_paths
+```
+
+Instead of just transforming every string starting with `gem:` in the configuration (which could have unintended side-effects)
+or hard-coding the paths where to look for gem references (which would not work well with additional plugins),
+I made the parts of the configuration where gem references are replaced [fully configurable](https://github.com/cr7pt0gr4ph7/jekyll-gem-resolver?tab=readme-ov-file#path-syntax).
+
+#### Caveat: Pinning execjs to `2.7.0`
+
+Although not related to my plugin but to `jekyll-autoprefixer`, I hope that this PSA saves some people the headache I had:
+
+Due to [a bug with ExecJS][execjs-bug] (which is used by jekyll-autoprefixer/[`autoprefixer-rails`][autoprefixer-rails] internally to actually run
+[autoprefixer]),
+one has to explicitly force the ExecJS gem to a last version not affected by the bug, which is version 2.7.0
+to avoid some confusing runtime errors:
+
+```ruby
+# Gemfile
+# Required to avoid runtime errors in jekyll-autoprefixer caused by ExecJS 2.8.0 and later
+gem "execjs", "= 2.7.0"
+```
+
+
+### The full picture
+
+My whole setup (excluding totally unrelated parts) for building Bootstrap from the [bootstrap rubygem][bootstrap-gem],
+including Autoprefixer, now looks like this:
+
+```yaml
+# _config.yml
+
+plugins:
+  - jekyll-gem-resolver
+  - jekyll-autoprefixer
+
+sass:
+  load_paths:
+    - 'gem:bootstrap/assets/stylesheets'
+
+gem_resolver:
+  transform:
+    - sass.load_paths
+```
+
+Besides the `bootstrap` gem, you also have to reference the `jekyll-gem-resolver` and `jekyll-autoprefixer` gems in your `Gemfile`:
+
+```ruby
+# Gemfile
+source "https://rubygems.org"
+
+gem "jekyll", "~> 4.3.3"
+
+# Acquire bootstrap to use its SASS sources
+gem "bootstrap", "~> 5.3.2"
+
+# If you have any plugins, put them here!
+group :jekyll_plugins do
+  gem "jekyll-gem-resolver", "~> 0.0.3"
+  gem "jekyll-autoprefixer", "~> 1.0"
+end
+
+# Required to avoid runtime errors in jekyll-autoprefixer caused by ExecJS 2.8.0 and later
+gem "execjs", "= 2.7.0"
+
+# The remainder of this file is just taken from the default Jekyll template:
+# Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
+# and associated library.
+platforms :mingw, :x64_mingw, :mswin, :jruby do
+  gem "tzinfo", ">= 1", "< 3"
+  gem "tzinfo-data"
+end
+# Performance-booster for watching directories on Windows
+gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
+# Lock `http_parser.rb` gem to `v0.6.x` on JRuby builds since newer versions of the gem
+# do not have a Java counterpart.
+gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
+```
+
+Importing files from the Bootstrap gem looks just like any other SCSS code:
+
+```scss
+// assets/css/default.scss
+
+// ...
+@import "bootstrap";
+// ...
+```
+
+Neat!
+
+### Conclusion
+
+I've published the plugin on GitHub and RubyGems.
+You can find the documentation and source code for the plugin [**here**][jekyll-gem-resolver].
+
+[jekyll]: https://jekyllrb.com/
+[bootstrap]: https://github.com/twbs/bootstrap
+[bootstrap-build-docs]: https://getbootstrap.com/docs/5.3/getting-started/download/#source-files
+[bootstrap-gem]: https://github.com/twbs/bootstrap-rubygem
+[blog-bootstrap-jekyll]: https://medium.com/codex/how-to-add-bootstrap-5-sass-to-jekyll-e3b189f71552
+
+[jekyll-sass-converter]: https://github.com/jekyll/jekyll-sass-converter
+[jekyll-autoprefixer]: https://github.com/vwochnik/jekyll-autoprefixer
+[jekyll-autoprefixer-sourcemaps]: https://github.com/vwochnik/jekyll-autoprefixer/pull/16
+[jekyll-gem-resolver]: https://github.com/cr7pt0gr4ph7/jekyll-gem-resolver
+[jekyll-gem-resolver-gem]: https://rubygems.org/gems/jekyll-gem-resolver
+[autoprefixer]: https://github.com/postcss/autoprefixer
+[autoprefixer-rails]: https://github.com/ai/autoprefixer-rails
+[execjs-bug]: https://github.com/rails/execjs/issues/99