module Bundler::RubyDsl

# File bundler/ruby_dsl.rb, line 5
def ruby(*ruby_version)
  options = ruby_version.last.is_a?(Hash) ? ruby_version.pop : {}
  ruby_version.flatten!

  raise GemfileError, "Please define :engine_version" if options[:engine] && options[:engine_version].nil?
  raise GemfileError, "Please define :engine" if options[:engine_version] && options[:engine].nil?

  if options[:file]
    raise GemfileError, "Cannot specify version when using the file option" if ruby_version.any?
    file_content = Bundler.read_file(Bundler.root.join(options[:file]))
    if /^ruby\s+(.*)$/.match(file_content) # match .tool-versions files
      ruby_version << $1.split("#", 2).first.strip # remove trailing comment
    else
      ruby_version << file_content.strip
    end
  end

  if options[:engine] == "ruby" && options[:engine_version] &&
     ruby_version != Array(options[:engine_version])
    raise GemfileEvalError, "ruby_version must match the :engine_version for MRI"
  end
  @ruby_version = RubyVersion.new(ruby_version, options[:patchlevel], options[:engine], options[:engine_version])
end