railties/lib/rails/tasks/log.rake


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namespace :log do
  desc "Truncates all *.log files in log/ to zero bytes (specify which logs with LOGS=test,development)"
  task :clear do
    log_files.each do |file|
      clear_log_file(file)
    end
  end

  def log_files
    if ENV['LOGS']
      ENV['LOGS'].split(',')
                  .map    { |file| "log/#{file.strip}.log" }
                  .select { |file| File.exist?(file) }
    else
      FileList["log/*.log"]
    end
  end

  def clear_log_file(file)
    f = File.open(file, "w")
    f.close
  end
end