rubocop-stats.rb

require "json"
require "tempfile"
require "open3"

CUTOFF_COMMIT = "00d783fd87b21f17245a39980a9933bf128ff845"
config = Tempfile.new
config << File.read(".rubocop.yml").sub("inherit_from: .rubocop_todo.yml", "")
config.close


loop do
  current_commit = `git rev-parse HEAD`.strip
  raise StandardError, "rev-parse failed" if current_commit == ""
  current_commit_timestamp = `git show -s --format=%ct`.strip
  filename = "stats/#{current_commit_timestamp}-#{current_commit}.json"

  if File.exist?(filename)
    puts "Skipping #{current_commit}"
  else
    puts "Analyzing commit #{current_commit}"
    json_tmp = Tempfile.new
    system("rubocop --format autogenconf --format json --out #{json_tmp.path} --config #{config.path}")
    json = JSON.parse(File.read(json_tmp.path))
    json["summary"]["commit"] = current_commit
    json["summary"]["commit_timestamp"] = current_commit_timestamp

    File.write(filename, JSON.pretty_generate(json["summary"]))
  end

  previous_commit = `git log --pretty=format:"%H" -2`.split("\n").last

  system("git checkout #{previous_commit}", exception: true)

  break if current_commit == CUTOFF_COMMIT
end

puts "DONE!"