YAML の差分を JSON Patch (https://jsonpatch.com/) として生成してくれるスクリプト

README.md

Usage

ruby ./yaml_to_json_patch.rb OLD_YAML_FILE_PATH NEW_YAML_FILE_PATH

yaml_to_json_patch.rb

require 'yaml'
require 'json'
require 'set'

OLD_FILE = ARGV[0]
NEW_FILE = ARGV[1]

old_yaml = YAML.load_file(OLD_FILE)
new_yaml = YAML.load_file(NEW_FILE)

def flatten(hash_or_array)
  new_hash = Hash.new
  dict = hash_or_array.is_a?(Array) ? hash_or_array.map.with_index { |v, k| [k.to_s, v] }.to_h : hash_or_array
  dict.each do |(key, value)|
    if value.is_a?(Hash) || value.is_a?(Array)
      flatten(value).each do |(k, v)|
        new_hash["/#{key}#{k}"] = v
      end
    else
      new_hash["/#{key}"] = value
    end
  end

  new_hash
end

old_flatten_yaml = flatten(old_yaml)
new_flatten_yaml = flatten(new_yaml)

keys = Set.new(old_flatten_yaml.keys + new_flatten_yaml.keys)

patch = []
keys.each do |key|
  if old_flatten_yaml[key].nil? && !new_flatten_yaml[key].nil?
    patch << { 'op' => 'add', 'path' => key, 'value' => new_flatten_yaml[key] }
  end

  if !old_flatten_yaml[key].nil? && new_flatten_yaml[key].nil?
    patch << { 'op' => 'remove', 'path' => key }
  end
  
  if old_flatten_yaml[key] != new_flatten_yaml[key]
    patch << { 'op' => 'replace', 'path' => key, 'value' => new_flatten_yaml[key] }
  end
end

puts patch.to_json