class RuboCop::Cop::Style::SingleLineDoEndBlock


->(arg) { bar(arg) }
# good
->(arg) do bar(arg) end
# bad
end
bar(arg)
foo do |arg|
# good
foo do |arg| bar(arg) end
# bad
@example
preserve semantics and does not change it to ‘{`…`}` block.
in `Style/BlockDelimiters`. The autocorrection maintains the `do` … `end` syntax to
In practice a single line `do`…`end` is autocorrected when `EnforcedStyle: semantic`
Checks for single-line `do`…`end` block.

def do_line(node) 

def do_line(node)
  if node.numblock_type? || node.arguments.children.empty? || node.send_node.lambda_literal?
    node.loc.begin
  else
    node.arguments
  end
end

def on_block(node)

rubocop:disable Metrics/AbcSize 
def on_block(node)
  return if !node.single_line? || node.braces?
  add_offense(node) do |corrector|
    corrector.insert_after(do_line(node), "\n")
    node_body = node.body
    if node_body.respond_to?(:heredoc?) && node_body.heredoc?
      corrector.remove(node.loc.end)
      corrector.insert_after(node_body.loc.heredoc_end, "\nend")
    else
      corrector.insert_before(node.loc.end, "\n")
    end
  end
end

def x(corrector, node); end 

def x(corrector, node); end