tripwire.rb

# A simple tripwire utility to trigger breakpoints selectively.
#
# Requires `pry` and provides a pry console at the breakpoints.
#
# Place `binding.trip` anywhere you might want a breakpoint in your code
#
#     def some_method(args)
#       do_something
#       binding.trip # <= breakpoint here
#       do_something_else
#     end
#
# When you want that binding.trip to act like binding.pry, wrap it like so
#
#     Tripwire.set { some_method(:foo) }
#
# You can also turn it on, do stuff, then turn it off elsewhere.
#
#     Tripwire.set
#     some_method(:foo)
#     Tripwire.unset
#
class Tripwire
  class << self
    def on?
      @@on ||= false
    end

    def set
      @@on = true
      if block_given?
        yield
        @@on = false
      end
    end

    def unset
      @@on = false
    end
  end
end

class Object
  def trip(*a)
    pry(*a) if Tripwire.on?
  end
end