module EacRubyUtils::Ruby

def bundler_with_unbundled_env(&block)
  if ::Bundler.respond_to?(:with_unbundled_env)
    ::Bundler.with_unbundled_env(&block)
  else
    ::Bundler.with_clean_env(&block)
  end
end

def envvars_starting_with(start_with_vars)
  ENV.select { |k, _v| start_with_vars.any? { |var| k.start_with?(var) } }
end

def on_clean_environment
  bundler_with_unbundled_env do
    on_clean_envvars('BUNDLE', 'RUBY') { yield }
  end
end

def on_clean_envvars(*start_with_vars)
  old_values = envvars_starting_with(start_with_vars)
  old_values.each_key { |k| ENV.delete(k) }
  yield
ensure
  old_values&.each { |k, v| ENV[k] = v }
end