choosealicense.com/script/generate-docs

#!/usr/bin/env ruby
# Usage: script/generate-docs
# Reads in the fields, meta, and rules YAML files and produces markdown output
# suitable for documenting in the project's README

require 'yaml'

fields = YAML.load_file('_data/fields.yml')
meta   = YAML.load_file('_data/meta.yml')
rules  = YAML.load_file('_data/rules.yml')

puts "\n### Fields\n\n"
fields.each do |field|
  puts "* `#{field['name']}` - #{field['description']}"
end

puts "\n### YAML front matter\n"
meta = meta.group_by { |m| m['required'] }

puts "\n#### Required fields\n\n"
meta[true].each do |field|
  puts "* `#{field['name']}` - #{field['description']}"
end

puts "\n#### Optional fields\n\n"
meta[false].each do |field|
  puts "* `#{field['name']}` - #{field['description']}"
end

puts "\n### Rules\n"
rules.each do |group, group_rules|
  puts "\n#### #{group.capitalize}\n\n"
  group_rules.each do |rule|
    puts "* `#{rule['tag']}` - #{rule['description']}"
  end
end