Looking at ways to provide auto-reloading to an application outside of the Rails space.

a_test.rb

class A
  def hello ; puts "hello" ; end
  def goodbye ; puts "goodbye" ; end
end

b_test.rb

class A
  def silence ; puts "silence" ; end
end

reload.rb

require 'active_support'
require 'active_support/dependencies'
require 'open3'

include ActiveSupport::Dependencies
hook!

watcher = WatchStack.new
watcher.watch_namespaces([ Object ])

require './a_test'

watcher.new_constants.each do |constant|
  puts "Marking clas: #{constant} unloadable"
  unloadable constant
end

output, status = Open3.capture2e("ruby b_test.rb")

valid_code = (status == 0)

puts "Success? #{status}"

# We only wnat to clear and load the code if the code is valid ruby code

if valid_code
  clear
  require_or_load('./b_test')
else
  puts "*" * 80
  puts "There was an error in your code:"
  puts output
  puts "*" * 80
end

[ :hello, :goodbye, :silence ].each do |method|
  puts "A##{method} #{A.instance_methods.include?(method)}"
end