#! /usr/bin/env ruby
require 'json'

if ARGV.size < 1
  STDERR.puts "No input argument given."
  exit 1
end

if !File.readable?(ARGV[0])
  STDERR.puts "\"#{ARGV[0]}\" is not readable."
  exit 1
end

hash = JSON.parse(File.read(ARGV[0]))

if ARGV[1].nil?
  STDOUT.puts JSON.pretty_generate(hash)
elsif !File.exist?(ARGV[1])
  File.open(ARGV[1], "w") { |f| f.write(JSON.pretty_generate(hash)) }
else
  STDERR.puts "\"#{ARGV[1]}\" already exists."
  exit 1
end