Rake task which detects missing translations for a given locale

lib/missing_translation_detector.rb

@@ -0,0 +1,50 @@
+# Compares two locale files and detects missing translations.
+class MissingTranslationDetector
+  attr_reader :missing_translations
+
+  # @params [String] base_file_name File name of the base locale is i.e. en-US
+  # @params [String] target_file_name File name of a locale with missing translations is i.e. de
+  def initialize(base_file_name, target_file_name)
+    @base = yml_load base_file_name 
+    @target = yml_load target_file_name 
+    @missing_translations = []
+  end
+
+  # Detects missing translations within the target locale file
+  # and stores it in "missing_translations".
+  def detect(h=@base, keys=[])
+    h.each_key do |key|
+      key_path = keys.clone.push key
+
+      if h[key].is_a?(Hash)
+        detect h[key], key_path 
+      elsif blank?(key_path)
+        missing_translations << OpenStruct.new(:key_path => key_path,
+                                               :value => h[key]) 
+      end 
+    end
+  end
+
+  # @returns [Boolean] true if missing translations are detected, otherwise false is returned.
+  def missing_translations?
+    !@missing_translations.empty?
+  end
+
+  private
+
+  def blank?(keys)
+    h = @target
+
+    keys.each do |key|
+      return true if !h.is_a?(Hash) || !h.has_key?(key)
+      h = h[key]
+    end
+
+    h.nil?
+  end
+
+  def yml_load(file_name)
+    h = YAML.load_file "#{Rails.root}/config/locales/#{file_name}.yml"
+    h[h.keys.first]
+  end
+end

lib/tasks/ffcrm/missing_translations.rake

@@ -0,0 +1,33 @@
+# Copyright (c) 2008-2013 Michael Dvorkin and contributors.
+#
+# Fat Free CRM is freely distributable under the terms of MIT license.
+# See MIT-LICENSE file or http://www.opensource.org/licenses/mit-license.php
+#------------------------------------------------------------------------------
+
+require './lib/missing_translation_detector.rb'
+
+namespace :ffcrm do
+  namespace :missing_translations do
+    desc 'Detects missing translations for a locale - Takes source language and compares with "en-US".'
+    task :detect, [:locale] => [:environment] do |t, args|
+      base_locale = 'en-US'
+
+      [[base_locale, args[:locale]],
+       ["#{base_locale}_fat_free_crm", "#{args[:locale]}_fat_free_crm"]].each do |locale_file_names|
+        detector = MissingTranslationDetector.new locale_file_names.first,
+                                                  locale_file_names.last 
+        detector.detect
+
+        if detector.missing_translations?
+          puts
+          puts "Detected missing translations within \"config/locales/#{locale_file_names.last}.yml\":"
+          puts
+
+          detector.missing_translations.each do |missing|
+            puts "#{missing.key_path.join(' => ')}: #{missing.value}"
+          end
+        end
+      end
+    end
+  end
+end