空配列と空ハッシュで改行しないJSON.pretty_generate モンキーパッチ版

normalize.rake

require 'json'
require 'json/pure/generator'

module JSON::Pure::Generator::GeneratorMethods
  %i(Fixnum Bignum).each do |constant|
    const_set constant, Integer
  end
  
  module Array
    alias_method :pure_to_json, :to_json

    def to_json(state = nil, *)
      empty? ? '[]' : pure_to_json(state)
    end
  end
  
  module Hash
    alias_method :pure_to_json, :to_json

    def to_json(state = nil, *)
      empty? ? '{}' : sort.to_h.pure_to_json(state)
    end
  end
  
  remove_const :Integer
end

desc 'normalize a.json'
task :normalize do
  filename = 'a.json'

  JSON.generator = JSON::Pure::Generator
  src = File.open(filename) { |io| JSON.load(io) }
  File.open(filename, 'w') { |io| io.write(JSON.pretty_generate(src)) }
end

forked from https://gist.github.com/tarot/01789a80de9cfaa117f2