module DEBUGGER__

def self.setup_initial_suspend
  if !CONFIG[:nonstop]
    case
    when CONFIG[:stop_at_load]
      add_line_breakpoint __FILE__, __LINE__ + 1, oneshot: true, hook_call: false
      nil # stop here
    when path = ENV['RUBY_DEBUG_INITIAL_SUSPEND_PATH']
      add_line_breakpoint path, 0, oneshot: true, hook_call: false
    when loc = ::DEBUGGER__.require_location
      # require 'debug/start' or 'debug'
      add_line_breakpoint loc.absolute_path, loc.lineno + 1, oneshot: true, hook_call: false
    else
      # -r
      add_line_breakpoint $0, 0, oneshot: true, hook_call: false
    end
  end
end