Multi Counter JSON

---

examples/files/multi_counter_json.cr

require "json"

filename = "counter.json"

# if file exists read the content
counters = {} of String => Int32
if File.exists?(filename)
  content = File.new(filename)
  counters = Hash(String, Int32).from_json(content)
end

if ARGV.size == 1
  name = ARGV[0]
  if !counters.has_key?(name)
    counters[name] = 0
  end
  counters[name] += 1
  puts counters[name]
  File.write(filename, counters.to_json)
else
  counters.each { |arg, i|
    puts "#{i}: #{arg}"
  }
end