locale-expand.rb

#!/usr/bin/env ruby
require 'pathname'
require 'yaml'

def expand(new_yaml, yaml)
  yaml.keys.each do |k|
    append(new_yaml, k, yaml[k])
  end
end

def append(new_yaml, key, val)
  tree = key.split(/\./)
  current = tree.shift
  if tree.size == 0
    new_yaml[current] = val.to_s unless val.to_s == ''
  else
    new_yaml[current] = {} unless new_yaml.key?(current)
    append(new_yaml[current], tree.join('.'), val)
  end
end

file = Pathname.new(ARGV[0])
locale = file.to_s.match(/\/([a-z]{2}(?:\-[A-Z]{2})?)\//)[1] || raise(ArgumentError.new('Could not decipher locale from filename.'))
yaml = YAML.load_file(ARGV[0])
new_yaml = {}
expand(new_yaml, yaml)

if matches = file.to_s.match(/common\.yaml$/)
  new_file = Pathname.new("./config/locales/#{locale}.yml")
else
  new_file = Pathname.new("./config/locales/#{locale}/#{file.basename.to_s.gsub(/\.yaml$/, '.yml')}")
end

new_file.open('w') do |f|
  f.write({ locale => new_yaml }.to_yaml)
end

locale-flatten.rb

#!/usr/bin/env ruby
require 'yaml'
require 'json'
require 'pathname'
require 'fileutils'

def flatten(new_yaml, yaml, tree = nil)
  yaml.each do |k, v|
    full_key = tree.nil? ? k : [tree, k].join('.')
    if v.is_a? String
      new_yaml[full_key] = v.gsub(/"/, '"')
    elsif v.nil?
      $stderr.puts "#{full_key}: nil value"
    else
      flatten(new_yaml, v, full_key)
    end
  end
end

file = Pathname.new(ARGV[0])
yaml = YAML.load(file.read)
locale = yaml.keys.first
yaml = yaml[locale]

FileUtils.mkdir_p "./tmp/mygengo/#{locale}"

if matches = file.to_s.match(/locales\/([^\/]+)$/)
  # Mygengo uses the filename as the "section" name, so need to rename the "generic" yaml to something more useful.
  new_file = Pathname.new("./tmp/mygengo/#{locale}/common.yml")
else
  new_file = Pathname.new("./tmp/mygengo/#{locale}/#{file.basename}")
end

new_yaml = {}
flatten(new_yaml, yaml)
new_file.open('w') do |f|
  f.write new_yaml.to_json
end

mygengo.rake

namespace 'mygengo' do
  desc 'Exports the rails i18n locale files from config/locales into tmp/mygengo as flat json.'
  task :export => [:clear_tmp_dir] do
    %w(en es <your locales here>).each do |locale|
      sh "#{RAILS_ROOT}/bin/locales-flatten.rb #{RAILS_ROOT}/config/locales/#{locale}.yml"
      sh "for file in `find #{RAILS_ROOT}/config/locales/#{locale} -type f`; do #{RAILS_ROOT}/bin/locales-flatten.rb $file; done"
    end
  end

  desc 'Imports yaml files from mygengo into config/locales ready for commiting.'
  task :import => [:clear_tmp_dir] do
    sh "wget -q -O #{RAILS_ROOT}/tmp/mygengo/all.zip http://mygengo.com/string/p/<project name>/export/all/<project token>"
    sh "cd #{RAILS_ROOT}/tmp/mygengo && unzip all.zip"
    %w(en es <your locales here>).each do |locale|
      sh "for file in `ls #{RAILS_ROOT}/tmp/mygengo/#{locale}/*`; do #{RAILS_ROOT}/bin/locales-expand.rb $file; done"
    end
  end

  task :clear_tmp_dir do
    sh "rm -rf #{RAILS_ROOT}/tmp/mygengo"
    sh "mkdir -p #{RAILS_ROOT}/tmp/mygengo"
  end
end

.rb files go in RAILS_ROOT/bin, rake file goes in RAILS_ROOT/lib/tasks