snippet_prefix.rb

require 'set'
require 'active_support'
require 'active_support/all'
require 'markaby'

popup_enabled = ENV["POPUPS"]
use_fake_root = ENV["FAKE_ROOT"]
if use_fake_root
  def load_fake_root_to_hash(directory, h, i)
    Dir["#{directory}/*"].each do |f|
      components = f.split('/')

      if File.directory? f
        dirname = components[i]
        h[dirname] = {}
        load_fake_root_to_hash f, h[dirname], (i+1)
      else
        h[components.last] = File.read f
      end
    end
  end

  def load_to_fakefs_from_hash(h, directory)
    FileUtils.mkdir(directory) unless File.exist? directory

    h.each_pair do |name, content|
      is_directory = content.is_a? Hash
      if is_directory
        load_to_fakefs_from_hash(content, directory + name + "/")
      else
        File.open(directory + name, 'w') do |f|
          f.write content
        end
      end
    end
  end

  directory_map = {}
  load_fake_root_to_hash "fake-root", directory_map, 1
  require 'fakefs'
  load_to_fakefs_from_hash directory_map, "/"
else
  require 'fakefs'
end

class File
  def self.foreach(path)
    self.read(path).each_line { |line| yield(line) }
  end
end

class << IO
  [:sysopen, :for_fd, :popen, :readlines, :read, :binread, :binwrite, :select, :pipe, :try_convert, :copy_stream, :remove_class_variable, :class_variable_get, :class_variable_set, :public_constant, :private_constant, :public_instance_method, :!~, :singleton_class, :untrust, :untrusted?, :trust, :remove_instance_variable, :tap, :public_send, :extend, :display, :method, :public_method, :define_singleton_method, :object_id, :to_enum, :enum_for, :__id__].each { |m| define_method( m) { |*args| undef_method m }}
end

class Object
  remove_const :ENV
end

module Kernel
  [:warn, :trace_var, :untrace_var, :at_exit, :syscall, :open, :gets, :readline, :select, :readlines, :`, :test, :srand, :rand, :trap, :exec, :fork, :exit!, :system, :spawn, :sleep, :exit, :abort, :load, :require, :require_relative, :caller, :caller_locations, :set_trace_func, :untrust, :untrusted?, :trust, :tap, :display].each { |m| undef_method m }
end

class << Kernel
  [:warn, :trace_var, :untrace_var, :at_exit, :syscall, :open, :gets, :readline, :select, :readlines, :`, :test, :srand, :rand, :trap, :exec, :fork, :exit!, :system, :spawn, :sleep, :exit, :abort, :load, :require, :require_relative, :caller, :caller_locations, :set_trace_func].each { |m| undef_method m }
end

if popup_enabled
  def require(name)
    if name != "popup" || defined?(Popup)
      false
    else
      eval File.read("/Libraries/#{name}.rb")
      true
    end
  end
end