Script for finding missing translations in rails projects.

missing_translations.rb

#!/usr/bin/ruby

require 'yaml'

files = Dir["**/*.rb"] + Dir["**/*.haml"]

patterns = [
  / t\('([^']+)'\)/, # t('')
  / t\("([^"]+)"\)/, # t("")
  /I18n.translate\("([^"]+)"\)/, # I18n.translate("")
  /I18n.translate\('([^']+)'\)/] # I18n.translate('')

locale = YAML.load($stdin.read)["en"]

def key_present?(locale_branch, key)
  current = key.first

  return true if current.nil? # We found the key

  return false unless locale_branch.is_a?(Hash) && locale_branch.has_key?(current) # key does not exist

  key_present? locale_branch[current], key[1..-1]
end

files.each do |file_path|
  if File.stat(file_path).file?
    namespace = file_path.split('/')[2..-1]
    if namespace && !namespace.empty?
      namespace.map! { |e| e.start_with?("_") ? e[1..-1] : e } # remove _ from partial names '_form' => 'form'
      namespace.map! { |e| e.gsub("_helper", "") } # Helpers do not use helper prefix
      namespace[-1].gsub!(/\..+/, "") # remove file extensions
    else
      namespace = []
    end

    content = File.read(file_path)

    patterns.each do |pattern|
      content.scan(pattern) do |match|
        match = match.first
        key   = if match.start_with?(".")
                  namespace + match.split(".")[1..-1] # add namespace and remove dot in front of the key
                else
                  match.split(".")
                end

        puts "#{file_path}: #{key.join('.')}" unless key_present?(locale, key)
      end
    end
  end
end