log-all-required-path.rb

# Stick this at the bottom of environment.rb
# Run through your app, and "require.log.rb" will capture the libs that are loaded after-the-fact
# Then you can decide if you wish to load all these libs upfront.
# Possibly avoids the infamous "Expected x.rb to define x" errors

if ENV['LOAD_REQUIRE_LOG'] && File.exists?("require.log.rb")
  require "require.log.rb"
  $stderr.puts "Loaded require.log.rb"
end
Kernel.class_eval do
  alias :_original_require :require
  def require(*args)
    logged_string = args.collect {|path| "require '#{path}'\n  # #{caller.join("\n  # ")}" }.join("\n") + "\n"
    if ENV['LOAD_REQUIRE_LOG'] && File.exists?("require.log.rb")
      $stderr.puts logged_string
    else
      open("require.log.rb", "a") {|f| f.write(logged_string) }
    end
    _original_require(*args)
  end
end