class RuboCop::Cop::Style::WhileUntilModifier

The maximum line length is configurable.
if written as a modifier while/until.
Checks for while and until statements that would fit on one line

def autocorrect(node) 

def autocorrect(node)
  oneline = "#{node.body.source} #{node.keyword} " \
            "#{node.condition.source}"
  lambda do |corrector|
    corrector.replace(node.source_range, oneline)
  end
end

def check(node) 

def check(node)
  return unless node.multiline? && single_line_as_modifier?(node)
  add_offense(node, :keyword, format(MSG, node.keyword))
end

def on_until(node) 

def on_until(node)
  check(node)
end

def on_while(node) 

def on_while(node)
  check(node)
end