Listen and Pry debugging testcase

testlistener.rb

require 'listen'
require 'rb-readline'  # <-- adding this fixes issues
require 'pry'

class MyGuard

  attr_reader :thread
  def initialize(dir)
    callback = ->(*args){puts; puts "Got change: #{args.inspect}"}
    @listener = Listen.to(dir).change(&callback)
  end

  def start
    if !@thread || !@thread.alive?
      @thread = Thread.new do
        @listener.start
      end
    end
  end
end

class MyInteractor
  attr_reader :thread

  def start
    if !@thread || !@thread.alive?
      @thread = Thread.new do
        i = 0
        while true
          print "[#{i}] prompt> "
          resp = gets.chomp
          puts "DEBUG: received: #{resp}"
          i += 1
        end
      end
    end
  end
end

class MyPry
  attr_reader :thread

  def start
    if !@thread || !@thread.alive?
      @thread = Thread.new do
        Pry.start
        exit
      end
    end
  end
end

dir = Dir.pwd
puts "Listening to changes in '#{dir}'"

g = MyGuard.new dir
g.start

# Using MyInteractor works
#
# i = MyInteractor.new
# i.start
# i.thread.join

# Using MyPry blocks Listener
p = MyPry.new
p.start
p.thread.join


# This must be last thread, else the prompt won't be visible
g.thread.join