Sort your rails locale yamls alphabetically and adds an empty line when indent lowers 2 or more levelsPrints everything to stdout. Watch your yaml anchors and aliases (fix manually, if needed).usage: chmod +x ./locale_yaml_formatter.rb ./locale_yaml_formatter.rb <path/to/locale.yml>In a rails project, runfind . -type f -name *.yml | grep -v spec…

locale_yaml_formatter.rb

#!/usr/bin/env ruby

# Sort your rails locale yamls alphabetically and adds an empty line when indent lowers 2 or more levels
# Prints everything to stdout. Watch your yaml anchors and aliases (fix manually, if needed).
# usage:
#   chmod +x ./locale_yaml_formatter.rb
#   ./locale_yaml_formatter.rb <path/to/locale.yml>
# 
# In a rails project, run
# find . -type f -name *.yml | grep -v spec | grep locales | _
# awk '{system("cp "$0" "$0".tmp && locale_yaml_formatter.rb "$0".tmp > "$0" && rm "$0".tmp")}'

require 'yaml'

class Hash
  def to_hash_recursive
    result = self.to_hash

    result.each do |key, value|
      case value
      when Hash
        result[key] = value.to_hash_recursive
      when Array
        result[key] = value.to_hash_recursive
      end
    end

    result
  end

  def sort_by_key(recursive=false, &block)
    self.keys.sort(&block).reduce({}) do |seed, key|
      seed[key] = self[key]
      if recursive && seed[key].is_a?(Hash)
        seed[key] = seed[key].sort_by_key(true, &block)
      end 
      seed
    end
  end
end
 
class Array
  def to_hash_recursive
    result = self

    result.each_with_index do |value,i|
      case value
      when Hash
        result[i] = value.to_hash_recursive
      when Array
        result[i] = value.to_hash_recursive
      end
    end

    result
  end
end

def current_i18n_yaml(file = nil)
  i18n_yaml = if file && File.exists?(file)
      YAML::parse(File.read(file)).to_ruby.sort_by_key(true).to_yaml
    else
      {I18n.default_locale.to_s => I18n.backend.send(:translations)[I18n.default_locale].with_indifferent_access.to_hash_recursive}.sort_by_key(true).to_yaml
    end
  process = i18n_yaml.split(/\n/).reject{|e| e == ''}[1..-1]  # remove "---" from first line in yaml

  # add an empty line if yaml tree level changes by 2 or more
  # exmple:
  #   1   this:
  #   2     is:
  #   3       a:
  #   4         deep: branch in the tree
  #   5
  #   6   that:
  #   7     one: not
  #   8     two: ...
  # Line 5 will be inserted for better readability
  tmp_ary = []
  process.each_with_index do |line, idx|
    tmp_ary << line
    unless process[idx+1].nil?
      this_line_spcs = line.match(/\A\s*/)[0].length
      next_line_spcs = process[idx+1].match(/\A\s*/)[0].length
      tmp_ary << '' if next_line_spcs - this_line_spcs < -2
    end
  end

  tmp_ary * "\n"
end

# File.open(I18n.default_locale.to_s + '.yml', 'w') { |file| file.puts current_i18n_yaml}
puts current_i18n_yaml