remove whitespace and backport Tarmo's fix for making simple backend …

…able to store false values (and not confuse them with nil) http://github.com/rails/rails/commit/d69b4b7bea28fcab04f61afe381e06fa8e37b429

lib/i18n.rb

@@ -2,39 +2,39 @@
 #             Sven Fuchs (http://www.artweb-design.de),
 #             Joshua Harvey (http://www.workingwithrails.com/person/759-joshua-harvey),
 #             Saimon Moore (http://saimonmoore.net),
-#             Stephan Soller (http://www.arkanis-development.de/) 
+#             Stephan Soller (http://www.arkanis-development.de/)
 # Copyright:: Copyright (c) 2008 The Ruby i18n Team
 # License::   MIT
 require 'i18n/backend/simple'
 require 'i18n/exceptions'
 
-module I18n  
+module I18n
   @@backend = nil
-  @@load_path = []
+  @@load_path = nil
   @@default_locale = :'en-US'
   @@exception_handler = :default_exception_handler
-    
+
   class << self
     # Returns the current backend. Defaults to +Backend::Simple+.
     def backend
       @@backend ||= Backend::Simple.new
     end
-    
+
     # Sets the current backend. Used to set a custom backend.
-    def backend=(backend) 
+    def backend=(backend)
       @@backend = backend
     end
-  
+
     # Returns the current default locale. Defaults to 'en-US'
     def default_locale
-      @@default_locale 
+      @@default_locale
     end
-    
+
     # Sets the current default locale. Used to set a custom default locale.
-    def default_locale=(locale) 
-      @@default_locale = locale 
+    def default_locale=(locale)
+      @@default_locale = locale
     end
-    
+
     # Returns the current locale. Defaults to I18n.default_locale.
     def locale
       Thread.current[:locale] ||= default_locale
@@ -44,46 +44,48 @@ def locale
     def locale=(locale)
       Thread.current[:locale] = locale
     end
-    
+
     # Sets the exception handler.
     def exception_handler=(exception_handler)
       @@exception_handler = exception_handler
     end
-    
-    # Allow clients to register paths providing translation data sources. The 
+
+    # Allow clients to register paths providing translation data sources. The
     # backend defines acceptable sources.
     #
     # E.g. the provided SimpleBackend accepts a list of paths to translation
     # files which are either named *.rb and contain plain Ruby Hashes or are
-    # named *.yml and contain YAML data. So for the SimpleBackend clients may 
+    # named *.yml and contain YAML data. So for the SimpleBackend clients may
     # register translation files like this:
     #   I18n.load_path << 'path/to/locale/en-US.yml'
     def load_path
-      @@load_path
+      @@load_path ||= []
     end
 
+    # Sets the load path instance. Custom implementations are expected to
+    # behave like a Ruby Array.
     def load_path=(load_path)
       @@load_path = load_path
     end
-    
-    # Translates, pluralizes and interpolates a given key using a given locale, 
+
+    # Translates, pluralizes and interpolates a given key using a given locale,
     # scope, and default, as well as interpolation values.
     #
     # *LOOKUP*
     #
-    # Translation data is organized as a nested hash using the upper-level keys 
-    # as namespaces. <em>E.g.</em>, ActionView ships with the translation: 
+    # Translation data is organized as a nested hash using the upper-level keys
+    # as namespaces. <em>E.g.</em>, ActionView ships with the translation:
     # <tt>:date => {:formats => {:short => "%b %d"}}</tt>.
-    # 
-    # Translations can be looked up at any level of this hash using the key argument 
-    # and the scope option. <em>E.g.</em>, in this example <tt>I18n.t :date</tt> 
+    #
+    # Translations can be looked up at any level of this hash using the key argument
+    # and the scope option. <em>E.g.</em>, in this example <tt>I18n.t :date</tt>
     # returns the whole translations hash <tt>{:formats => {:short => "%b %d"}}</tt>.
-    # 
-    # Key can be either a single key or a dot-separated key (both Strings and Symbols 
+    #
+    # Key can be either a single key or a dot-separated key (both Strings and Symbols
     # work). <em>E.g.</em>, the short format can be looked up using both:
     #   I18n.t 'date.formats.short'
     #   I18n.t :'date.formats.short'
-    # 
+    #
     # Scope can be either a single key, a dot-separated key or an array of keys
     # or dot-separated keys. Keys and scopes can be combined freely. So these
     # examples will all look up the same short date format:
@@ -96,9 +98,9 @@ def load_path=(load_path)
     #
     # Translations can contain interpolation variables which will be replaced by
     # values passed to #translate as part of the options hash, with the keys matching
-    # the interpolation variable names. 
+    # the interpolation variable names.
     #
-    # <em>E.g.</em>, with a translation <tt>:foo => "foo {{bar}}"</tt> the option 
+    # <em>E.g.</em>, with a translation <tt>:foo => "foo {{bar}}"</tt> the option
     # value for the key +bar+ will be interpolated into the translation:
     #   I18n.t :foo, :bar => 'baz' # => 'foo baz'
     #
@@ -107,7 +109,7 @@ def load_path=(load_path)
     # Translation data can contain pluralized translations. Pluralized translations
     # are arrays of singluar/plural versions of translations like <tt>['Foo', 'Foos']</tt>.
     #
-    # Note that <tt>I18n::Backend::Simple</tt> only supports an algorithm for English 
+    # Note that <tt>I18n::Backend::Simple</tt> only supports an algorithm for English
     # pluralization rules. Other algorithms can be supported by custom backends.
     #
     # This returns the singular version of a pluralized translation:
@@ -116,9 +118,9 @@ def load_path=(load_path)
     # These both return the plural version of a pluralized translation:
     #   I18n.t :foo, :count => 0 # => 'Foos'
     #   I18n.t :foo, :count => 2 # => 'Foos'
-    # 
-    # The <tt>:count</tt> option can be used both for pluralization and interpolation. 
-    # <em>E.g.</em>, with the translation 
+    #
+    # The <tt>:count</tt> option can be used both for pluralization and interpolation.
+    # <em>E.g.</em>, with the translation
     # <tt>:foo => ['{{count}} foo', '{{count}} foos']</tt>, count will
     # be interpolated to the pluralized translation:
     #   I18n.t :foo, :count => 1 # => '1 foo'
@@ -128,11 +130,11 @@ def load_path=(load_path)
     # This returns the translation for <tt>:foo</tt> or <tt>default</tt> if no translation was found:
     #   I18n.t :foo, :default => 'default'
     #
-    # This returns the translation for <tt>:foo</tt> or the translation for <tt>:bar</tt> if no 
+    # This returns the translation for <tt>:foo</tt> or the translation for <tt>:bar</tt> if no
     # translation for <tt>:foo</tt> was found:
     #   I18n.t :foo, :default => :bar
     #
-    # Returns the translation for <tt>:foo</tt> or the translation for <tt>:bar</tt> 
+    # Returns the translation for <tt>:foo</tt> or the translation for <tt>:bar</tt>
     # or <tt>default</tt> if no translations for <tt>:foo</tt> and <tt>:bar</tt> were found.
     #   I18n.t :foo, :default => [:bar, 'default']
     #
@@ -152,17 +154,17 @@ def translate(key, options = {})
     rescue I18n::ArgumentError => e
       raise e if options[:raise]
       send @@exception_handler, e, locale, key, options
-    end        
+    end
     alias :t :translate
-    
+
     # Localizes certain objects, such as dates and numbers to local formatting.
     def localize(object, options = {})
       locale = options[:locale] || I18n.locale
       format = options[:format] || :default
       backend.localize(locale, object, format)
     end
     alias :l :localize
-    
+
   protected
     # Handles exceptions raised in the backend. All exceptions except for
     # MissingTranslationData exceptions are re-raised. When a MissingTranslationData
@@ -172,7 +174,7 @@ def default_exception_handler(exception, locale, key, options)
       return exception.message if MissingTranslationData === exception
       raise exception
     end
-          
+
     # Merges the given locale, key and scope into a single array of keys.
     # Splits keys that contain dots into multiple keys. Makes sure all
     # keys are Symbols.