create_local_gemfile.rb

desc "Support bundling from a typical datamapper dev checkout (allows BUNDLE_GEMFILE=Gemfile.local bundle exec foo)"
task :create_local_gemfile do |t|

  datamapper        = ENV['DATAMAPPER'] || File.expand_path('../..', __FILE__)
  excluded_adapters = (ENV['EXCLUDED_ADAPTERS'] || '').split(',')

  regex = /:git => \"#\{datamapper\}\/(.*?)(\.git|\")/

  File.open(File.expand_path('../Gemfile.local', __FILE__), 'w') do |f|
    File.open(File.expand_path('../Gemfile', __FILE__), 'r').each do |line|
      new_line = (line =~ regex) ? line.gsub(regex, ":path => \"#{datamapper}/#{$1}") : line
      new_line = "##{new_line}" if excluded_adapters.any? { |name| line =~ /#{name}/ }
      f.puts new_line
    end
  end

end