local gem file for ruby development

Gemfile.local.rb

# name the file Gemfile.local
gem 'fuubar'

gem 'pry'
gem 'pry-stack_explorer'

if RUBY_VERSION =~ /^2/
  gem 'pry-byebug'
else
  gem 'pry-debugger'
end

Gemfile.rb

### you need this in your Gemfile for it to access the local Gemfile

if File.exists? "#{__FILE__}.local"
  eval(File.read("#{__FILE__}.local"), binding)
end

Bundler provides a way to evaluate a Gemfile:

Bundler.read_file("{__FILE__}.local")