为什么空行缩进不好？ [英] Why is indentation in empty lines bad?

问题描述

我知道的每个FOSS项目都有在代码中的尾部空格的规则。但我认为继续当前缩进在下一行是非常自然的：

  int main（）
 {
 ... int a = 42; 
 .... 
 .... return a; 
} 
  

但是git实例会抛出警告。所以我的问题是：为什么这些标签 在当前缩进不好？

我不是在寻找答案办法。

解决方案

这可能是因为合并具有无用空格的补丁比它应该更难。

diff（1）和 patch（1）将空格和制表符视为重要内容。 （询问任何 Makefile 或 .py 源文件 - 它们是重要的！如果空白行上有四个空格，并且我的空白行有八个空格，任何尝试在我们之间共享补丁将失败，原因。

授予，如果你批量改变一段代码的缩进，你必须去一些工作，使补丁应用 em>。但试图在看起来空白处追踪合并失败是痛苦。 （我已经浪费了太多的我的生活做到这一点。是的， vim listchars 可以帮助，

无尾随空白。从存储的角度来看，这里或那里的十几个丢失的字节可能没有什么意义，但它确实使得合并补丁变得更容易。我们可能还要标准化添加结尾的空白，正如你建议的，并且同样快乐，但我们可以尽可能简洁地标准化方法。

Every FOSS project I know has rules against trailing whitespace in code. But I think it's very natural to continue the current indentation on the next line:

int main()
{
....int a = 42;
....
....return a;
}

But git for instance throws warnings anyway. So my question is: Why are those tabs inside the current indentation bad?

I'm not looking for answers like "It's always done this way". Let's assume indentation is done consistently in the whole project in question.

解决方案

It is probably because merging patches with useless whitespace is harder than it should be.

diff(1) and patch(1) treat spaces and tabs as important content. (Ask any Makefile or .py source file -- they are important!) And if your "blank line" has four spaces on it, and my "blank line" has eight spaces on it, any attempt to share patches between us will fail for very trivial reasons.

Granted, if you wholesale change the indentation of a block of code, you'll have to go to some work to make patches apply anyway. But trying to track down merge failures on lines that look blank is painful. (I've wasted too much of my life doing just that. Yes, vim listchars can help, but reading code with listchars on all the time is also annoying.)

So people standardize on no trailing whitespace. It might not really make sense to worry about a dozen lost bytes here or there from a storage standpoint, but it really makes merging patches easier. We could probably just as well standardize on adding trailing whitespace, exactly as you have suggested, and be just as happy, but we might as well standardize on the approach that is as parsimonious as possible.

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