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+jekyll-docker
+=============
+
+| Feature | Command
+| ---------------------- | ----------------------------------------------
+| Install [ruby-install] | `make ruby-install && make ruby-install/clean`
+| Install Ruby | `make ruby`
+| Install [chruby] | `make chruby && make chruby/clean`
+| Install [Bundler] | `make bundler`
+| Install dependencies | `make dependencies`
+| Run [Jekyll] | `make jekyll/serve`
+| Run Jekyll in Docker | `make docker/up`
+
+[ruby-install]: https://github.com/postmodern/ruby-install
+[chruby]: https://github.com/postmodern/chruby
+[Bundler]: https://bundler.io/
+[Jekyll]: https://jekyllrb.com/
+
+| Parameter | Default | Description
+| -------------------- | --------- | --------------------------------------------------
+| PROJECT_DIR | .. | Jekyll project directory
+| RUBY_INSTALL_VERSION | 0.7.0 | ruby-install version
+| RUBY_VERSION | 2.6.5 | Ruby version
+| CHRUBY_VERSION | 0.3.9 | chruby version
+| PREFIX | ~/.local/ | Installation directory for ruby-install and chruby
+
+Set parameter values by passing them to make, i.e.
+
+ make ruby RUBY_VERSION=2.7.0
+
+Examples
+--------
+
+1. Set up an environment and run Jekyll locally:
+
+ make ruby-install
+ make ruby-install/clean
+ make ruby
+ make chruby
+ make chruby/clean
+ make bundler
+ make dependencies PROJECT_DIR=../jekyll-project/
+ make jekyll/serve PROJECT_DIR=../jekyll-project/
+
+ Some of these might not work on the first try (you'd need to install some
+ native dependencies for your gems, use `sudo`, etc.).
+
+2. Run Jekyll in Docker:
+
+ make docker/up PROJECT_DIR=../jekyll-project/
+
+ This builds two images: `jekyll_base` and `jekyll_project`, and runs a
+ container, which binds PROJECT_DIR, and runs Jekyll there.
+
+ To rebuild the images (i.e. when you bump dependencies), run
+
+ make docker/build PROJECT_DIR=../jekyll-project/
+
+ To bring everything down,
+
+ make docker/down
+
+Notes
+-----
+
+This project was supposed to be included as a submodule in my Jekyll projects'
+repositories.
+I would then `cd` to Jekyll project's directory and run something like
+
+ make -f jekyll-docker/Makefile docker/up
+
+and I'd get a Docker container running Jekyll, without actually bothering to
+install everything locally.
+This goal was achieved, but I also noticed that "out-of-tree" builds were
+actually possible, hence the introduction of the PROJECT_DIR parameter, and the
+slight crazyness with the two separate images.