Diff two JSON files after normalizing them with jq

jsondiff.rb

#!/usr/bin/env ruby
require 'open3'
require 'tempfile'
require 'shellwords'

if ARGV.size != 2
  warn "** usage: jsondiff.rb j1 j2"
  exit 63
end
files = ARGV.dup.map do |arg|
  ARGV.replace([arg])
  f = ARGF.read
  result, err, _s = Open3.capture3("jq", stdin_data: f)
  warn err
  file = Tempfile.new("jsondiff-")
  file.write(result)
  file.close
  file.path
end
exec("diff -u #{files.shelljoin}")