railties/lib/rails/tasks/log.rake


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namespace :log do
  
  ## 
  # Truncates all/specified log files
  # ENV['LOGS'] 
  #   - defaults to standard environment log files i.e. 'development,test,production'
  #   - ENV['LOGS']=all truncates all files i.e. log/*.log
  #   - ENV['LOGS']='test,development' truncates only specified files
  desc "Truncates all/specified *.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'] == 'all'
      FileList["log/*.log"]
    elsif ENV['LOGS']
      log_files_to_truncate(ENV['LOGS'])
    else
      log_files_to_truncate("development,test,production")
    end
  end

  def log_files_to_truncate(envs)
    envs.split(',')
        .map    { |file| "log/#{file.strip}.log" }
        .select { |file| File.exist?(file) }
  end
  
  def clear_log_file(file)
    f = File.open(file, "w")
    f.close
  end
end