1 files changed, 70 insertions, 0 deletions
diff --git a/ruby_1_9_3/lib/rubygems/deprecate.rb b/ruby_1_9_3/lib/rubygems/deprecate.rb
new file mode 100644
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+++ b/ruby_1_9_3/lib/rubygems/deprecate.rb
@@ -0,0 +1,70 @@
+##
+# Provides a single method +deprecate+ to be used to declare when
+# something is going away.
+#
+#     class Legacy
+#       def self.klass_method
+#         # ...
+#       end
+#
+#       def instance_method
+#         # ...
+#       end
+#
+#       extend Gem::Deprecate
+#       deprecate :instance_method, "X.z", 2011, 4
+#
+#       class << self
+#         extend Gem::Deprecate
+#         deprecate :klass_method, :none, 2011, 4
+#       end
+#     end
+
+module Gem
+  module Deprecate
+
+    def self.skip # :nodoc:
+      @skip ||= false
+    end
+
+    def self.skip= v # :nodoc:
+      @skip = v
+    end
+
+    ##
+    # Temporarily turn off warnings. Intended for tests only.
+
+    def skip_during
+      Gem::Deprecate.skip, original = true, Gem::Deprecate.skip
+      yield
+    ensure
+      Gem::Deprecate.skip = original
+    end
+
+    ##
+    # Simple deprecation method that deprecates +name+ by wrapping it up
+    # in a dummy method. It warns on each call to the dummy method
+    # telling the user of +repl+ (unless +repl+ is :none) and the
+    # year/month that it is planned to go away.
+
+    def deprecate name, repl, year, month
+      class_eval {
+        old = "_deprecated_#{name}"
+        alias_method old, name
+        define_method name do |*args, &block| # TODO: really works on 1.8.7?
+          klass = self.kind_of? Module
+          target = klass ? "#{self}." : "#{self.class}#"
+          msg = [ "NOTE: #{target}#{name} is deprecated",
+            repl == :none ? " with no replacement" : ", use #{repl}",
+            ". It will be removed on or after %4d-%02d-01." % [year, month],
+            "\n#{target}#{name} called from #{Gem.location_of_caller.join(":")}",
+          ]
+          warn "#{msg.join}." unless Gem::Deprecate.skip
+          send old, *args, &block
+        end
+      }
+    end
+
+    module_function :deprecate, :skip_during
+  end
+end