Ytrbium is a simple YAML+ERB templating library in Ruby. With Ytrbium:

• Generate large, verbose YAML files from reusable templates.
• Collect and organize reusable template methods in multiple files and import them into each template.
• Indent template items correctly and intuitively.

Add this line to your application's Gemfile:

gem 'ytrbium'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install ytrbium

Basic usage is demonstrated by a simple example:

require "ytrbium"
template = <<~TEMPL
  <%! def hello(times) -%>
    <% times.times do |n| -%>
    - Hi <%= n + 1 %>!
    <% end -%>
  <%! end -%>
  msg:
  <%= hello(options[:count] || 4) -%>
TEMPL

Ytrbium.expand(template)
# =>
#  msg:
#  - Hi 1
#  - Hi 2
#  - Hi 3
#  - Hi 4

options = { count: 2 }
puts Ytrbium.expand(template, binding: binding)
# =>
#  msg:
#  - Hi 1
#  - Hi 2

A Ytrbium template is an ERB template over a YAML document with some additional YAML-specific functionality:

1. You can declare re-usable functions in the template
2. You can split templates across files and import them into a main template
3. Every line of each dynamic ERB tag's content is indented correctly in its surroundings, which enables you to apply 1. and 2. with impunity and not worry that your resulting document is structured incorrectly.

Expanding the previous example:

examples/hello.template.yaml:

<%! def hello(times) -%>
  <% times.times do |n| -%>
  - Hi <%= n + 1 %>!
  <% end -%>
<%! end -%>

examples/main.template.yaml:

<% import 'hello.template.yaml' -%>
one_message:
  <%= hello(1) -%>
  - final_messages:
    <%= hello(2) -%>

Run the ytrbium command on the main template:

ytrbium examples/main.template.yaml
---
one_message:
  - Hi 1!
  - final_messages:
    - Hi 1!
    - Hi 2!

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/nicksieger/ytrbium. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the Ytrbium project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.