class Pry class Command::Wtf < Pry::ClassCommand match /wtf([?!]*)/ group 'Context' description 'Show the backtrace of the most recent exception' options :listing => 'wtf?' banner <<-BANNER Show's a few lines of the backtrace of the most recent exception (also available as _ex_.backtrace). If you want to see more lines, add more question marks or exclamation marks: e.g. pry(main)> wtf? pry(main)> wtf?!???!?!? To see the entire backtrace, pass the -v/--verbose flag: e.g. pry(main)> wtf -v BANNER def options(opt) opt.on(:v, :verbose, "Show the full backtrace.") end def process raise Pry::CommandError, "No most-recent exception" unless exception output.puts "#{text.bold('Exception:')} #{exception.class}: #{exception}\n--" if opts.verbose? output.puts with_line_numbers(backtrace) else output.puts with_line_numbers(backtrace.first(size_of_backtrace)) end end private def exception _pry_.last_exception end def with_line_numbers(bt) Pry::Code.new(bt, 0, :text).with_line_numbers.to_s end def backtrace exception.backtrace end def size_of_backtrace [captures[0].size, 0.5].max * 10 end end Pry::Commands.add_command(Pry::Command::Wtf) end