better backtrace cmd for pry-byebug

anonymous-gist.

class Byebug::PryProcessor
  CMDS = %i[
            backtrace
            down
            finish
            frame
            next
            step
            up
           ]

  def perform(action, options = {})
    return unless CMDS.include?(action)

    send("perform_#{action}", options)
  end
end

class BetterBT < Pry::ClassCommand
  include PryByebug::Helpers::Navigation

  match "bt"
  group "Byebug"

  description "Display the current (filtered) stack."

  banner <<-BANNER
      Usage: bt

      Display the current stack, filtered of extra crap.
    BANNER

  def process
    PryByebug.check_file_context(target)

    breakout_navigation :bt
  end

  class Cmd < Byebug::WhereCommand
    def print_backtrace
      relevant_context = context.stack_size.times.reject { |index|
        context.frame_file(index) =~ %r%/(gems|ruby)/%
      }

      bt = prc('frame.line', relevant_context) do |index, _|
        Byebug::Frame.new(context, index).to_hash
      end

      print(bt)
    end
  end

  module PerformBT
    Byebug::PryProcessor::CMDS.unshift :bt
    Byebug::PryProcessor.include self

    def perform_bt(_options)
      BetterBT::Cmd.new(self, "bt").execute

      resume_pry
    end
  end
end

Pry::Commands.add_command(BetterBT)