如何从Nim的主块返回退出代码? [英] How to return an exit code from the main block in Nim?

问题描述

在Nim中，要编写作为某种主要功能执行的代码，您可以这样做(类似于Python中的main检查):

In Nim, to write code that executes as a sort of main function, you do (similar to the is main checks in Python):

when isMainModule:
    echo ("Hello, Nim!")

但是，对于我自己的一生，我不知道如何返回错误代码.传统上，总是有一个使主函数返回int的选项，但是由于它实际上不在proc中，因此似乎您不能return；因此，您可以将其返回.我唯一想出的方法是raise一个异常.当然有一种方法可以控制您的退出代码是否为零?

However, for the life of me, I can't figure out how to return an error code. Traditionally there has always been an option to make main functions return int, but since this is not actually in a proc, it doesn't seem like you can return; the only thing I've figured out how to do is to raise an exception. Surely there is a way to just control whether your exit code is zero or not?

推荐答案

我认为system.quit可能就是您想要的.根据 Nim文档:

I think system.quit may be what you're looking for. According to the Nim docs:

proc quit(errorcode: int = QuitSuccess) {..}

使用退出代码立即停止程序.

Stops the program immediately with an exit code.

在您的nim程序完成而不会发生意外的平台时，隐式调用proc quit(QuitSuccess)，这是预期的行为.引发的未处理异常等同于调用quit(QuitFailure).

The proc quit(QuitSuccess) is called implicitly when your nim program finishes without incident for platforms where this is the expected behavior. A raised unhandled exception is equivalent to calling quit(QuitFailure).

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