sublime_debug_require.rb

class RubyVersion
  attr_accessor :version, :gem_name, :init_block, :debug_block, :gem_version

  def initialize(version, gem_name, debug_block, init_block, gem_version = nil)
    self.version =version
    self.gem_name = gem_name
    self.init_block = init_block
    self.debug_block = debug_block
    self.gem_version = gem_version
  end
end

require 'byebug/core'

r193 = RubyVersion.new("1.9.3", "debugger", lambda { debugger  }, lambda {  Debugger.wait_connection = true; Debugger.start_remote "127.0.0.1" })
r200 = RubyVersion.new("2.0.0", "byebug", lambda { byebug  }, lambda {  Byebug.wait_connection = true; Byebug.start_server "127.0.0.1" }, ">=2.5.0")

if current_version = RUBY_VERSION > "1.9.3" ? r200 : r193
  begin
    require current_version.gem_name

    if current_version.gem_version and not Gem::Specification.find_all_by_name(current_version.gem_name, Gem::Requirement.create(current_version.gem_version)).any?
      puts "#{current_version.gem_name} version is not supported,"
      puts "please run: gem install byebug --version'#{current_version.gem_version}'"
      exit
    end

    current_version.init_block.call

    pid = Process.pid
    at_exit {
      if $! and pid == Process.pid
        puts "Last exception: #{$!.inspect}"
        puts "Backtrace: "
        puts "#{$@}"
      end
    }

    current_version.debug_block.call

  rescue LoadError
    puts "#{current_version.gem_name.capitalize} gem is not installed for ruby version: #{RUBY_VERSION}"
    puts "please look for installation instructions here:"
    puts "https://github.com/shuky19/sublime_debugger"
    puts "Last exception: #{$!.inspect}"
    puts "Backtrace: "
    puts "#{$@}"
    exit
  rescue Errno::EADDRINUSE
    puts "Another process is using the debugging ports (8989,8990)"
    puts "please make sure this ports are free and than run the debugger"
    exit
  end
end