An improved version of `p` method for Rails.

config__initializers__kernel.rb

module Kernel
  def log2(*args)
    $log_counter ||= 1
    options = args.size > 1 && Hash === args.last ? args.pop : {}
    stack_lines = options[:stack_lines] || 1

    call_lines = caller(1, stack_lines)
    stack_line_stripper = lambda do |line|
      stack_line = line[/^.+\/gems\/(.+)$/, 1]
      stack_line || line.delete_prefix("#{Rails.root}/")
    end
    call_line = stack_line_stripper[call_lines.first]

    args.each do |arg|
      output = "\e[1m\e[37m#{$log_counter.to_s.rjust(5, '0')}\e[0m "\
               "\e[31m#{call_line}\e[0m "\
               "\e[1m\e[37m->\e[0m "\
               "\e[33m#{arg.inspect}\e[0m"

      Rails.logger.info(output)
    end

    call_lines[1..].each do |line|
      Rails.logger.info("\e[1m\e[37m\t-> #{stack_line_stripper[line]}\e[0m")
    end

    $log_counter += 1
    args.size == 1 ? args.first : args
  end
end