Remove deprecation from AS::Deprecation behavior, some minor cleanups

* Refactor log subscriber, use select! to avoid a new object
* Remove deprecation messages related to AS::Deprecation behavior
  This was added about 2 years ago for Rails 3:
  https://github.com/rails/rails/commit/d4c7d3fd94e5a885a6366eaeb3b908bb58ffd4db
* Remove some not used requires
* Refactor delegate to avoid string conversions and if statements inside each block

activesupport/lib/active_support/basic_object.rb

@@ -10,5 +10,4 @@ def raise(*args)
       ::Object.send(:raise, *args)
     end
   end
-
 end

activesupport/lib/active_support/core_ext/module/delegation.rb

@@ -106,9 +106,11 @@ def delegate(*methods)
     unless options.is_a?(Hash) && to = options[:to]
       raise ArgumentError, "Delegation needs a target. Supply an options hash with a :to key as the last argument (e.g. delegate :hello, :to => :greeter)."
     end
-    prefix, to, allow_nil = options[:prefix], options[:to], options[:allow_nil]
 
-    if prefix == true && to.to_s =~ /^[^a-z_]/
+    to = to.to_s
+    prefix, allow_nil = options.values_at(:prefix, :allow_nil)
+
+    if prefix == true && to =~ /^[^a-z_]/
       raise ArgumentError, "Can only automatically set the delegation prefix when delegating to a method."
     end
 
@@ -122,10 +124,8 @@ def delegate(*methods)
     file, line = caller.first.split(':', 2)
     line = line.to_i
 
-    methods.each do |method|
-      method = method.to_s
-
-      if allow_nil
+    if allow_nil
+      methods.each do |method|
         module_eval(<<-EOS, file, line - 2)
           def #{method_prefix}#{method}(*args, &block)        # def customer_name(*args, &block)
             if #{to} || #{to}.respond_to?(:#{method})         #   if client || client.respond_to?(:name)
@@ -133,7 +133,9 @@ def #{method_prefix}#{method}(*args, &block)        # def customer_name(*args, &
             end                                               #   end
           end                                                 # end
         EOS
-      else
+      end
+    else
+      methods.each do |method|
         exception = %(raise "#{self}##{method_prefix}#{method} delegated to #{to}.#{method}, but #{to} is nil: \#{self.inspect}")
 
         module_eval(<<-EOS, file, line - 1)

activesupport/lib/active_support/dependencies.rb

@@ -129,16 +129,14 @@ def new_constants
 
       # Add a set of modules to the watch stack, remembering the initial constants
       def watch_namespaces(namespaces)
-        watching = []
-        namespaces.map do |namespace|
+        @watching << namespaces.map do |namespace|
           module_name = Dependencies.to_constant_name(namespace)
           original_constants = Dependencies.qualified_const_defined?(module_name) ?
             Inflector.constantize(module_name).local_constants : []
 
-          watching << module_name
           @stack[module_name] << original_constants
+          module_name
         end
-        @watching << watching
       end
 
       private
@@ -365,7 +363,7 @@ def require_or_load(file_name, const_path = nil)
 
       # Record history *after* loading so first load gets warnings.
       history << expanded
-      return result
+      result
     end
 
     # Is the provided constant path defined?
@@ -434,7 +432,7 @@ def autoload_module!(into, const_name, qualified_name, path_suffix)
       mod = Module.new
       into.const_set const_name, mod
       autoloaded_constants << qualified_name unless autoload_once_paths.include?(base_path)
-      return mod
+      mod
     end
 
     # Load the file at the provided path. +const_paths+ is a set of qualified
@@ -458,7 +456,7 @@ def load_file(path, const_paths = loadable_constants_for_path(path))
       autoloaded_constants.concat newly_defined_paths unless load_once_path?(path)
       autoloaded_constants.uniq!
       log "loading #{path} defined #{newly_defined_paths * ', '}" unless newly_defined_paths.empty?
-      return result
+      result
     end
 
     # Return the constant path for the provided parent and constant name.
@@ -505,7 +503,7 @@ def load_missing_constant(from_mod, const_name)
 
       raise NameError,
             "uninitialized constant #{qualified_name}",
-            caller.reject {|l| l.starts_with? __FILE__ }
+            caller.reject { |l| l.starts_with? __FILE__ }
     end
 
     # Remove the constants that have been autoloaded, and those that have been
@@ -543,10 +541,7 @@ def get(key)
 
       def safe_get(key)
         key = key.name if key.respond_to?(:name)
-        @store[key] || begin
-          klass = Inflector.safe_constantize(key)
-          @store[key] = klass
-        end
+        @store[key] ||= Inflector.safe_constantize(key)
       end
 
       def store(klass)
@@ -600,10 +595,10 @@ def will_unload?(const_desc)
     def mark_for_unload(const_desc)
       name = to_constant_name const_desc
       if explicitly_unloadable_constants.include? name
-        return false
+        false
       else
         explicitly_unloadable_constants << name
-        return true
+        true
       end
     end
 
@@ -631,10 +626,10 @@ def new_constants_in(*descs)
         return new_constants unless aborting
 
         log "Error during loading, removing partially loaded constants "
-        new_constants.each {|c| remove_constant(c) }.clear
+        new_constants.each { |c| remove_constant(c) }.clear
       end
 
-      return []
+      []
     end
 
     # Convert the provided const desc to a qualified constant name (as a string).
@@ -663,7 +658,7 @@ def remove_constant(const) #:nodoc:
       constantized.before_remove_const if constantized.respond_to?(:before_remove_const)
       parent.instance_eval { remove_const to_remove }
 
-      return true
+      true
     end
 
     protected

activesupport/lib/active_support/file_update_checker.rb

-require "active_support/core_ext/array/extract_options"
-
 module ActiveSupport
   # \FileUpdateChecker specifies the API used by Rails to watch files
   # and control reloading. The API depends on four methods:
@@ -93,10 +91,10 @@ def execute_if_updated
 
     def updated_at #:nodoc:
       @updated_at || begin
-        all = []
-        all.concat @files.select { |f| File.exists?(f) }
+        all = @files.select { |f| File.exists?(f) }
         all.concat Dir[@glob] if @glob
-        all.map { |path| File.mtime(path) }.max || Time.at(0)
+        all.map! { |path| File.mtime(path) }
+        all.max || Time.at(0)
       end
     end
 
@@ -104,9 +102,8 @@ def compile_glob(hash) #:nodoc:
       hash.freeze # Freeze so changes aren't accidently pushed
       return if hash.empty?
 
-      globs = []
-      hash.each do |key, value|
-        globs << "#{escape(key)}/**/*#{compile_ext(value)}"
+      globs = hash.map do |key, value|
+        "#{escape(key)}/**/*#{compile_ext(value)}"
       end
       "{#{globs.join(",")}}"
     end

activesupport/lib/active_support/log_subscriber.rb

@@ -3,7 +3,7 @@
 
 module ActiveSupport
   # ActiveSupport::LogSubscriber is an object set to consume ActiveSupport::Notifications
-  # with the sole purpose of logging them. The log subscriber dispatches notifications to 
+  # with the sole purpose of logging them. The log subscriber dispatches notifications to
   # a registered object based on its given namespace.
   #
   # An example would be Active Record log subscriber responsible for logging queries:
@@ -75,7 +75,8 @@ def flushable_loggers
         @@flushable_loggers ||= begin
           loggers = log_subscribers.map(&:logger)
           loggers.uniq!
-          loggers.select { |l| l.respond_to?(:flush) }
+          loggers.select! { |l| l.respond_to?(:flush) }
+          loggers
         end
       end
 
@@ -101,8 +102,7 @@ def call(message, *args)
     %w(info debug warn error fatal unknown).each do |level|
       class_eval <<-METHOD, __FILE__, __LINE__ + 1
         def #{level}(progname = nil, &block)
-          return unless logger
-          logger.#{level}(progname, &block)
+          logger.#{level}(progname, &block) if logger
         end
       METHOD
     end

activesupport/lib/active_support/notifications/fanout.rb

@@ -9,15 +9,14 @@ def initialize
       end
 
       def subscribe(pattern = nil, block = Proc.new)
-        subscriber = Subscriber.new(pattern, block).tap do |s|
-          @subscribers << s
-        end
+        subscriber = Subscriber.new(pattern, block)
+        @subscribers << subscriber
         @listeners_for.clear
         subscriber
       end
 
       def unsubscribe(subscriber)
-        @subscribers.reject! {|s| s.matches?(subscriber)}
+        @subscribers.reject! { |s| s.matches?(subscriber) }
         @listeners_for.clear
       end
 

activesupport/lib/active_support/notifications/instrumenter.rb

-require 'active_support/core_ext/module/delegation'
-
 module ActiveSupport
   module Notifications
     class Instrumenter

activesupport/lib/active_support/railtie.rb

@@ -8,30 +8,6 @@ class Railtie < Rails::Railtie
     initializer "active_support.deprecation_behavior" do |app|
       if deprecation = app.config.active_support.deprecation
         ActiveSupport::Deprecation.behavior = deprecation
-      else
-        defaults = {"development" => :log,
-                    "production"  => :notify,
-                    "test"        => :stderr}
-
-        env = Rails.env
-
-        if defaults.key?(env)
-          msg = "You did not specify how you would like Rails to report " \
-                "deprecation notices for your #{env} environment, please " \
-                "set config.active_support.deprecation to :#{defaults[env]} " \
-                "at config/environments/#{env}.rb"
-
-          warn msg
-          ActiveSupport::Deprecation.behavior = defaults[env]
-        else
-          msg = "You did not specify how you would like Rails to report " \
-                "deprecation notices for your #{env} environment, please " \
-                "set config.active_support.deprecation to :log, :notify or " \
-                ":stderr at config/environments/#{env}.rb"
-
-          warn msg
-          ActiveSupport::Deprecation.behavior = :stderr
-        end
       end
     end
 
@@ -42,8 +18,7 @@ class Railtie < Rails::Railtie
       zone_default = Time.find_zone!(app.config.time_zone)
 
       unless zone_default
-        raise \
-          'Value assigned to config.time_zone not recognized.' +
+        raise 'Value assigned to config.time_zone not recognized. ' \
           'Run "rake -D time" for a list of tasks for finding appropriate time zone names.'
       end
 

activesupport/test/file_update_checker_test.rb

@@ -83,10 +83,10 @@ def test_should_not_invoke_the_block_if_a_watched_dir_changed_its_glob
 
   def test_should_not_block_if_a_strange_filename_used
     FileUtils.mkdir_p("tmp_watcher/valid,yetstrange,path,")
-    FileUtils.touch(FILES.map { |file_name| "tmp_watcher/valid,yetstrange,path,/#{file_name}" } )
+    FileUtils.touch(FILES.map { |file_name| "tmp_watcher/valid,yetstrange,path,/#{file_name}" })
 
     test = Thread.new do
-      ActiveSupport::FileUpdateChecker.new([],"tmp_watcher/valid,yetstrange,path," => :txt){ i += 1 }
+      ActiveSupport::FileUpdateChecker.new([],"tmp_watcher/valid,yetstrange,path," => :txt) { i += 1 }
       Thread.exit
     end
     test.priority = -1