Ruby 異常格式化輸出：PrettyBacktrace

PrettyBacktrace 項目用于對 Ruby 的異常堆棧進行格式化顯示，示例代碼：

require 'pretty_backtrace'
PrettyBacktrace.enable

def recursive n
  str = "Hi #{n}!!  " * 128
  if n > 0
    recursive n - 1
  else
    raise "bottom of recursive"
  end
end

recursive 3

格式化效果：

test.rb:10:in `recursive' (n = 0, str = "Hi 0!!  Hi 0!!  Hi 0...): bottom of recursive (RuntimeError)
        from test.rb:9:in `recursive' (n = 1, str = "Hi 1!!  Hi 1!!  Hi 1...)
        from test.rb:9:in `recursive' (n = 2, str = "Hi 2!!  Hi 2!!  Hi 2...)
        from test.rb:9:in `recursive' (n = 3, str = "Hi 3!!  Hi 3!!  Hi 3...)
        from test.rb:15:in `<main>'

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