modify json interactively on Ruby data structure.

modify_json.rb

#!/usr/bin/env ruby

def modify_json(file_path)
  require 'json'
  require 'colorize'
  require 'pry'
  raise "The file is not exist!".red if not File.exists? file_path
  json = JSON.parse(File.read(file_path))
  puts "json.keys: " + json.keys.join(",")
  binding.pry
  File.write file_path, json.to_json
  puts "The file has updated!".green
end

modify_json(ARGV.first)