Port Annotations rake task to use Rails::NotesCommand

* Invokes the notes Rails::Command and passes the rake task ENV variables as annotations options to it
* Adds a deprecation warning for unsupported commands
* Gets rid of reference to ENV["SOURCE_ANNOTATION_DIRECTORIES"] in SourceAnnotationExtractor since its now dealt with in the NotesCommand
* Gets rid of rake desc for each rake notes task so they are not documented while using `rails -T` or `rails --help`

railties/lib/rails/source_annotation_extractor.rb

@@ -20,7 +20,7 @@ module Rails
   class SourceAnnotationExtractor
     class Annotation < Struct.new(:line, :tag, :text)
       def self.directories
-        @@directories ||= %w(app config db lib test) + (ENV["SOURCE_ANNOTATION_DIRECTORIES"] || "").split(",")
+        @@directories ||= %w(app config db lib test)
       end
 
       # Registers additional directories to be included
@@ -54,6 +54,13 @@ module Rails
         s << "[#{tag}] " if options[:tag]
         s << text
       end
+
+      # Used in annotations.rake
+      #:nodoc:
+      def self.notes_task_deprecation_warning
+        ActiveSupport::Deprecation.warn("This rake task is deprecated and will be removed in Rails 6.1. \nRefer to `rails notes --help` for more information.\n")
+        puts "\n"
+      end
     end
 
     # Prints all annotations with tag +tag+ under the root directories +app+,

railties/lib/rails/tasks/annotations.rake

@@ -2,21 +2,21 @@
 
 require "rails/source_annotation_extractor"
 
-desc "Enumerate all annotations (use notes:optimize, :fixme, :todo for focus)"
 task :notes do
-  Rails::SourceAnnotationExtractor.enumerate "OPTIMIZE|FIXME|TODO", tag: true
+  Rails::SourceAnnotationExtractor::Annotation.notes_task_deprecation_warning
+  Rails::Command.invoke :notes
 end
 
 namespace :notes do
   ["OPTIMIZE", "FIXME", "TODO"].each do |annotation|
-    # desc "Enumerate all #{annotation} annotations"
     task annotation.downcase.intern do
-      Rails::SourceAnnotationExtractor.enumerate annotation
+      Rails::SourceAnnotationExtractor::Annotation.notes_task_deprecation_warning
+      Rails::Command.invoke :notes, ["--annotations", annotation]
     end
   end
 
-  desc "Enumerate a custom annotation, specify with ANNOTATION=CUSTOM"
   task :custom do
-    Rails::SourceAnnotationExtractor.enumerate ENV["ANNOTATION"]
+    Rails::SourceAnnotationExtractor::Annotation.notes_task_deprecation_warning
+    Rails::Command.invoke :notes, ["--annotations", ENV["ANNOTATION"]]
   end
 end