#!/usr/bin/env ruby

require 'open3'
require 'tempfile'

def with_tempfile(name)
  file = Tempfile.new(name)
  yield file
ensure
  file.close
end

plist = ARGF.read
puts plist or exit unless File.exist?("/usr/libexec/PlistBuddy")

with_tempfile('info.plist') do |f|
  f << plist
  f.flush

  stdout, _, status = Open3.capture3("/usr/libexec/PlistBuddy -c 'Print :variablesdontexport' #{f.path}")
  puts plist or exit unless status.success?

  vars = stdout.split("\n")[1..-2].map(&:strip)

  vars.each do |var|
    `/usr/libexec/PlistBuddy -c "Set :variables:#{var} ''" #{f.path}`
  end

  f.rewind
  puts f.read
end