Resort help output by utility

lib/pry/default_commands/help.rb

@@ -42,7 +42,7 @@ def process
         def display_index(groups)
           help_text = []
 
-          groups.keys.sort.each do |key|
+          groups.keys.sort_by(&method(:group_sort_key)).each do |key|
             commands = groups[key].sort_by{ |command| command.options[:listing].to_s }
 
             unless commands.empty?
@@ -117,6 +117,10 @@ def search_hash(search, hash)
         def normalize(key)
           key.downcase.gsub(/pry\W+/, '')
         end
+
+        def group_sort_key(group_name)
+          [%w(Help Context Editing Introspection Input_and_output Navigating_pry Gems Basic Commands).index(group_name.gsub(' ', '_')) || 99, group_name]
+        end
       end
     end
   end