uncovered-diff.rb

RSpec.configure do |config|
config.before(:suite) { Coverage.start(oneshot_lines: true) }
  config.after :suite do
    coverage_data = Coverage.result(stop: true, clear: true)
    uncovered_lines(coverage_data)
  end
end

def parse_git_diff(base_branch)
  diff_output, _stderr, _status = Open3.capture3("git diff #{base_branch} --unified=0")
  modified_lines = Hash.new { |hash, key| hash[key] = [] }
  file_name = nil

  diff_output.each_line do |line|
    if line =~ %r{^\+\+\+ b/(.+)$}
      file_name = Regexp.last_match(1) # ファイル名を取得
    elsif line =~ /^@@ .* \+(\d+)(?:,(\d+))? @@/ && file_name
      start_line = Regexp.last_match(1).to_i
      line_count = (Regexp.last_match(2) || 1).to_i
      modified_lines[file_name].concat((start_line...(start_line + line_count)).to_a)
    end
  end
  modified_lines
end

def uncovered_lines(coverage_data_)
  coverage_data = coverage_data_.filter{|k,_| k.starts_with? Dir.pwd }

  # 変更された行を取得する
  base_branch = "master" # 必要に応じて変更
  modified_lines = parse_git_diff(base_branch)

  # 未実行の変更行を特定
  uncovered_lines = {}
  modified_lines.each do |file, lines|
    coverage_entry = coverage_data.find { |f, _l| file.ends_with?(f) }
    if coverage_entry.nil?
      uncovered_lines[file] = lines
      next
    end
    uncovered = lines.reject { _1.in? coverage_entry[1][:oneshot_lines] }
    uncovered_lines[file] = uncovered unless uncovered.empty?
  end

  # 結果出力
  puts "未実行の変更行:"
  uncovered_lines.each do |file, lines|
    puts "#{file}: #{lines.join(', ')}"
  end
end