Calculate AbcSize. MIT LICENSE

calc_abcsize.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

# AbcSize を範囲ごとにカウントして CSV に出力する
#
# 実行方法
#   $ ruby calc_abcsize.rb
#
# tmp/abcsize.csv の例)
#   20..29,30..39,40..49,50..59,60..69,70..79,80..89,90..99,100..
#   48,22,7,4,0,4,1,1,3

require 'csv'
require 'json'
require 'rubocop'
require 'tempfile'

ABC_SIZE_MAX = 20
CONFIG = <<~EOF
AllCops:
  TargetRubyVersion: 2.3
  DisabledByDefault: true
  Exclude:
    - 'tmp/**/*'
    - 'db/schema.rb'
    - 'node_modules/**/*'

Metrics/AbcSize:
  Max: #{ABC_SIZE_MAX}
EOF
MESSAGE_REGEXP = %r{\[(.+)/#{ABC_SIZE_MAX}\]$}
CSV_PATH = 'tmp/abcsize.csv'

def config
  @config ||= Tempfile.new.tap do |f|
    f.write(CONFIG)
    f.close
  end
end

def out
  @out ||= Tempfile.new.tap { |f| f.close }
end

def run_rubocop
  args = ['--parallel', '--config', config.path, '--format', 'json', '--out', out.path]
  RuboCop::CLI.new.run(args)
  JSON.parse(File.read(out.path))
end

def calc_result(json)
  result = Hash.new(0)
  json['files'].each do |file|
    file['offenses'].each do |offense|
      message = offense['message']
      m = message.match(MESSAGE_REGEXP)
      abcsize = m[1].to_i
      key = abcsize > 100 ? 10 : abcsize / 10
      result[key] += 1
    end
  end
  result
end

def write_csv(result)
  range = (ABC_SIZE_MAX / 10).upto(10)
  head = range.map do |n|
    base = n * 10
    n < 10 ? "#{base}..#{base + 9}" : "#{base}.."
  end

  CSV.open(CSV_PATH, 'w') do |csv|
    csv << head
    csv << range.map { |n| result[n] }
  end
end

json = run_rubocop
result = calc_result(json)
write_csv(result)

trace_abcsize.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

# 2014/1 から月初のコミットを checkout し、 AbcSize を計測します。
# このスクリプトの実行後は `detached HEAD` をチェックアウトした状態になるので注意してください。
# 不安なら、 `git worktree` コマンドで別の作業ディレクトリを用意するのがオススメです。
#
# 実行方法
#   $ ruby trace_abcsize.rb
#   $ echo 'date,20..29,30..39,40..49,50..59,60..69,70..79,80..89,90..99,100..' >> result.csv
#   $ for f in $(ls 20*.csv); do echo ${f%.csv},$(tail -1 ${f}) >> result.csv; done
#
# result.csv の例)
#   date,20..29,30..39,40..49,50..59,60..69,70..79,80..89,90..99,100..
#   20140203_1152,48,22,7,4,0,4,1,1,3
#   20140303_1506,47,20,7,4,0,5,1,1,3

RUBOCOP_CONFIG = '.rubocop.yml'
RBENV_FILE = '.ruby-version'
CSV_PATH = 'tmp/abcsize.csv'

def git_log(since:, format:)
  `git log --all --merges --since='#{since}' --format='#{format}' | tail -1`.chomp
end

def each_month(&block)
  (2014..2017).each do |year|
    (1..12).each do |month|
      yield(year, month)
    end
  end
end

def run_abcsize(year, month)
  since = "#{year}-#{month}-1"
  puts "## start #{since}"

  hash = git_log(since: since, format: '%H')
  return if hash.empty?

  `git checkout #{hash}`

  File.delete(RBENV_FILE) if File.exist?(RBENV_FILE)
  File.delete(RUBOCOP_CONFIG) if File.exist?(RUBOCOP_CONFIG)
  `./calc_abcsize`

  at = git_log(since: since, format: '%at')
  to = Time.at(at.to_i).strftime('%Y%m%d_%H%M')
  File.rename(CSV_PATH, "#{to}.csv")

  `git checkout #{hash} .`

  puts "## finish #{since}"
end

each_month { |y, m| run_abcsize(y, m) }