* lib/rdoc.rb, lib/rdoc, test/rdoc: Update to RDoc 4.2.0.alpha(313287)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47391 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rdoc/generator/pot.rb

@@ -0,0 +1,97 @@
+##
+# Generates a POT file.
+#
+# Here is a translator work flow with the generator.
+#
+# == Create .pot
+#
+# You create .pot file by pot formatter:
+#
+#   % rdoc --format pot
+#
+# It generates doc/rdoc.pot.
+#
+# == Create .po
+#
+# You create .po file from doc/rdoc.pot. This operation is needed only
+# the first time. This work flow assumes that you are a translator
+# for Japanese.
+#
+# You create locale/ja/rdoc.po from doc/rdoc.pot. You can use msginit
+# provided by GNU gettext or rmsginit provided by gettext gem. This
+# work flow uses gettext gem because it is more portable than GNU
+# gettext for Rubyists. Gettext gem is implemented by pure Ruby.
+#
+#   % gem install gettext
+#   % mkdir -p locale/ja
+#   % rmsginit --input doc/rdoc.pot --output locale/ja/rdoc.po --locale ja
+#
+# Translate messages in .po
+#
+# You translate messages in .po by a PO file editor. po-mode.el exists
+# for Emacs users. There are some GUI tools such as GTranslator.
+# There are some Web services such as POEditor and Tansifex. You can
+# edit by your favorite text editor because .po is a text file.
+# Generate localized documentation
+#
+# You can generate localized documentation with locale/ja/rdoc.po:
+#
+#   % rdoc --locale ja
+#
+# You can find documentation in Japanese in doc/. Yay!
+#
+# == Update translation
+#
+# You need to update translation when your application is added or
+# modified messages.
+#
+# You can update .po by the following command lines:
+#
+#   % rdoc --format pot
+#   % rmsgmerge --update locale/ja/rdoc.po doc/rdoc.pot
+#
+# You edit locale/ja/rdoc.po to translate new messages.
+
+class RDoc::Generator::POT
+
+  RDoc::RDoc.add_generator self
+
+  ##
+  # Description of this generator
+
+  DESCRIPTION = 'creates .pot file'
+
+  ##
+  # Set up a new .pot generator
+
+  def initialize store, options #:not-new:
+    @options    = options
+    @store      = store
+  end
+
+  ##
+  # Writes .pot to disk.
+
+  def generate
+    po = extract_messages
+    pot_path = 'rdoc.pot'
+    File.open(pot_path, "w") do |pot|
+      pot.print(po.to_s)
+    end
+  end
+
+  def class_dir
+    nil
+  end
+
+  private
+  def extract_messages
+    extractor = MessageExtractor.new(@store)
+    extractor.extract
+  end
+
+  autoload :MessageExtractor, 'rdoc/generator/pot/message_extractor'
+  autoload :PO,               'rdoc/generator/pot/po'
+  autoload :POEntry,          'rdoc/generator/pot/po_entry'
+
+end