Added rake task translate:changed that can show you from one YAML fil…

…e to another which keys have had their texts changed

README

@@ -22,13 +22,16 @@ In addition to the web UI this plugin adds the following rake tasks:
 translate:lost_in_translation
 translate:merge_keys
 translate:google
+translate:changed
 
 The lost_in_translation task shows you any I18n keys in your code that are do not have translations in the YAML file for your default locale, i.e. config/locales/sv.yml.
 
 The merge_keys task is supposed to be used in conjunction with Sven Fuch's Rails I18n TextMate bundle (http://github.com/svenfuchs/rails-i18n/tree/master). Texts and keys extracted with the TextMate bundle end up in the temporary file log/translations.yml. When you run the merge_keys rake task the keys are moved over to the corresponding I18n locale file, i.e. config/locales/sv.yml. The merge_keys task also checks for overwrites of existing keys by warning you that one of your extracted keys already exists with a different translation.
 
 The google task is used for auto translating from one locale to another using Google Translate.
 
+The changed rake task can show you between one YAML file to another which keys have had their texts changed.
+
 Installation
 =========
 Obtain the source with:

lib/translate/keys.rb

@@ -26,6 +26,33 @@ def i18n_keys(locale)
     extract_i18n_keys(I18n.backend.send(:translations)[locale.to_sym]).sort
   end
 
+  # Convert something like:
+  # 
+  # {
+  #  :pressrelease => {
+  #    :label => {
+  #      :one => "Pressmeddelande"
+  #    }
+  #   }
+  # }
+  # 
+  # to:
+  # 
+  #  {'pressrelease.label.one' => "Pressmeddelande"}
+  #
+  def self.to_shallow_hash(hash)
+    hash.inject({}) do |shallow_hash, (key, value)|
+      if value.is_a?(Hash)
+        to_shallow_hash(value).each do |sub_key, sub_value|
+          shallow_hash[[key, sub_key].join(".")] = sub_value
+        end
+      else
+        shallow_hash[key.to_s] = value
+      end
+      shallow_hash
+    end
+  end
+
   # Convert something like:
   # 
   #  {'pressrelease.label.one' => "Pressmeddelande"}
@@ -41,7 +68,7 @@ def i18n_keys(locale)
   # }
   def self.to_deep_hash(hash)    
     hash.inject({}) do |deep_hash, (key, value)|
-      keys = key.split('.').reverse
+      keys = key.to_s.split('.').reverse
       leaf_key = keys.shift
       key_hash = keys.inject({leaf_key.to_sym => value}) { |hash, key| {key.to_sym => hash} }
       deep_merge!(deep_hash, key_hash)

spec/keys_spec.rb

@@ -53,21 +53,13 @@ def translations
 
   describe "to_deep_hash" do
     it "convert shallow hash with dot separated keys to deep hash" do
-      Translate::Keys.to_deep_hash({
-        'pressrelease.label.one' => "Pressmeddelande",
-        'pressrelease.label.other' => "Pressmeddelanden",
-        'article' => "Artikel",
-        'category' => ''
-      }).should == {
-        :pressrelease => {
-          :label => {
-            :one => "Pressmeddelande",
-            :other => "Pressmeddelanden"
-          }
-        },
-        :article => "Artikel",
-        :category => ''
-      }
+      Translate::Keys.to_deep_hash(shallow_hash).should == deep_hash
+    end
+  end
+
+  describe "to_shallow_hash" do
+    it "converts a deep hash to a shallow one" do
+      Translate::Keys.to_shallow_hash(deep_hash).should == shallow_hash
     end
   end
 
@@ -77,6 +69,28 @@ def translations
   #
   ##########################################################################
 
+  def shallow_hash
+    {
+      'pressrelease.label.one' => "Pressmeddelande",
+      'pressrelease.label.other' => "Pressmeddelanden",
+      'article' => "Artikel",
+      'category' => ''
+    }    
+  end
+
+  def deep_hash
+    {
+      :pressrelease => {
+        :label => {
+          :one => "Pressmeddelande",
+          :other => "Pressmeddelanden"
+        }
+      },
+      :article => "Artikel",
+      :category => ''
+    }    
+  end
+
   def i18n_files_dir
     File.join(File.dirname(__FILE__), "files", "translate")
   end

tasks/translate.rake

@@ -139,4 +139,22 @@ namespace :translate do
     puts "\nTime elapsed: #{(((Time.now - start_at) / 60) * 10).to_i / 10.to_f} minutes"    
     Translate::Storage.new(ENV['TO'].to_sym).write_to_file
   end
+
+  desc "List keys that have changed I18n texts between YAML file ENV['FROM_FILE'] and YAML file ENV['TO_FILE']. Set ENV['VERBOSE'] to see changes"
+  task :changed => :environment do
+    from_hash = Translate::Keys.to_shallow_hash(Translate::File.new(ENV['FROM_FILE']).read)
+    to_hash = Translate::Keys.to_shallow_hash(Translate::File.new(ENV['TO_FILE']).read)
+    from_hash.each do |key, from_value|
+      if (to_value = to_hash[key]) && to_value != from_value
+        key_without_locale = key[/^[^.]+\.(.+)$/, 1]
+        if ENV['VERBOSE']
+          puts "KEY: #{key_without_locale}"
+          puts "FROM VALUE: '#{from_value}'"
+          puts "TO VALUE: '#{to_value}'"
+        else
+          puts key_without_locale
+        end
+      end      
+    end
+  end
 end