Top 10 Issues in Rubocop

rubocop_analyzer.rb

require 'json'

Kernel.system('rubocop app lib spec -f json -P > rubocop.json')

data = JSON.parse(File.read('rubocop.json'))

offenses = data['files'].flat_map { |f| f['offenses'] }

top_10 = offenses.group_by { |f| f['cop_name'] }
                 .map { |key, values| [key, values.count] }
                 .sort_by { |_, count| count }
                 .reverse
                 .first(20)

top_10.each do |cop_name, count|
  puts "#{cop_name} - #{count}"
end