Running local ruby scripts on remote Heroku app instance

irbify.rb

#!/usr/bin/env ruby

# 
# Usage:
# irbify.rb script.rb | heroku run rails console --app=my-app
# 
# Why eval and not piping directly? Piping directly would run all lines even if previous line was an invalid statement.
#

script_name = ARGV[0]
script = File.open(script_name, 'r').read

if File.readable? script_name
  puts 'eval ' + script.dump + '; exit'
  exit 0
else
  puts "Cannot read/open '#{ARGV[0]}'"
  exit 1
end