module Thor::Util

def ruby_command
  @ruby_command ||= begin
    ruby_name = RbConfig::CONFIG["ruby_install_name"]
    ruby = File.join(RbConfig::CONFIG["bindir"], ruby_name)
    ruby << RbConfig::CONFIG["EXEEXT"]
    # avoid using different name than ruby (on platforms supporting links)
    if ruby_name != "ruby" && File.respond_to?(:readlink)
      begin
        alternate_ruby = File.join(RbConfig::CONFIG["bindir"], "ruby")
        alternate_ruby << RbConfig::CONFIG["EXEEXT"]
        # ruby is a symlink
        if File.symlink? alternate_ruby
          linked_ruby = File.readlink alternate_ruby
          # symlink points to 'ruby_install_name'
          ruby = alternate_ruby if linked_ruby == ruby_name || linked_ruby == ruby
        end
      rescue NotImplementedError # rubocop:disable Lint/HandleExceptions
        # just ignore on windows
      end
    end
    # escape string in case path to ruby executable contain spaces.
    ruby.sub!(/.*\s.*/m, '"\&"')
    ruby
  end
end