初学者脚本:^@ 出现在文本末尾 [英] Beginner scripting: ^@ appearing at the end of text

问题描述

我正在尝试创建一个有助于创建 shebangs 的脚本(好吧，它可能没有那么有用，但在您不知道程序在哪里时具有优势，例如)，这是我目前所拥有的:

I'm trying to create a script that helps creating shebangs (Ok, it may not be that useful but has advantages when you don't know where the program is, for example), here's what I have so far:

function! CreateShebang()
    call inputsave()
    let program = input('Enter the program name: ')
    call inputrestore()
    let path = system('which ' . program)
    call append(0, '#!' . path)
endfunction

顺便说一句，我刚开始使用vim脚本，所以如果您发现任何错误的功能和概念或知道实现结果的更好方法，请告诉我.任何帮助都非常感谢.

By the way, I'm just starting with vim scrips, so if you notice any wrong function and concepts or know a better way to achieve the result, please tell me. Any help is really appreciated.

最大的问题是，脚本运行后提示输入程序名正确，然后在文件中添加如下内容:

The big problem is that after running, the scripts prompts for the program name correctly and then add something like this to the file:

#!/usr/bin/perl^@

^@ 在那里做什么?

另外，如果我可以在这里问另一个问题，如何在 input() 之后清除命令行?用户输入的文本会一直显示，直到输入另一个命令.

Also, If I may ask another question here, how can I clear the command line after input()? The text entered by the user keeps showing until another command is entered.

推荐答案

^@ 在命令的末尾是一个由 append() 函数转换为 NULL 的换行符，见 :h NL-used-for-Nul (这就是为什么你的 substitute(...\%d000...) 在你没有 NULL 的情况下工作的原因在你的字符串中).由于 which 命令总是在字符串的末尾输出换行符，我建议您通过将 [:-2] 添加到 系统的末尾来稍微修改您的代码() 调用.这种结构将只去除函数输出的最后一个字节:

^@ at the end of command is a newline translated to NULL by append() function, see :h NL-used-for-Nul (it the reason why your substitute(...\%d000...) worked while you don't have NULL in your string). As which command always outputs newline at the end of string, I suggest you to slightly modify your code by adding [:-2] to the end of the system() call. This construction will strip just the last byte of function output:

let path = system('which ' . program)[:-2]

如果您使用替代品，请使用

If you use substitute, use

let path=substitute(path, '\n', '', 'g')

，不要将自己与语义错误的 \%d000 混淆.

, don't confuse yourself with \%d000 which is semantically wrong.

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