向终端提示添加颜色会导致较大的空白空间 [英] Adding colors to terminal prompt results in large white space

问题描述

我正在处理一个简单的cli脚本，并想在以下代码中添加一些颜色:

I'm working on a simple cli script and wanted to add some color to the following code:

rl.question('Enter destination path: ', function(answer) {
     // ...                                                                                                                                
});                                                                                                                                  
rl.write('/home/' + user + '/bin');

哪个显示在终端上:

Enter destination path: /home/jmcateer/bin_

但是我想在提示中添加一些颜色:

But I wanted to add some color to the prompt I did the following:

rl.question('\u001b[1;36mEnter destination path:\u001b[0m ', function(answer) {

});                                                                                                                                  
rl.write('/home/' + user + '/bin');

并且命令行提示符最终显示:

And the command line prompt ended up displaying:

Enter destination path:                 /home/jmcateer/bin_

它可以工作，但是我不希望有很多空白.有人对如何处理有任何想法吗?

It works but there's a huge amount of white space I'd prefer weren't there. Does anyone have any ideas on how to deal with this?

我无法通过退格来删除空白...当我尝试使用退格键时，空白会像这样跳到另一端

I can't delete the white space by backspacing through it... when I try to use the backspace key the white space jumps to the other end like so

Enter destination path:                 /home/jmcateer/bin_
Enter destination path: /home/jmcateer/bi                _
Enter destination path: /home/jmcateer/b                _
...
Enter destination path:                 _

那时候，退格键无效.

推荐答案

在不带第二个参数的情况下调用rl.setPrompt(prompt, length)时，

When you call rl.setPrompt(prompt, length) without its second argument, the internal _promptLength variable is set to the length of the prompt string; ANSI X3.64 escape sequences are not interpreted. The internal _getCursorPos method computes the cursor position from _promptLength][3]; as such, the inclusion of the escape sequences in the length results in the cursor being positioned further away than it should be.

要完全解决此问题，设置_promptLength时，Node的readline库应解析ANSI转义序列.要变通解决此问题，您可以手动计算提示字符串的长度，而不使用转义序列，并将其作为第二个参数传递给rl.setPrompt(prompt, length).

To resolve this problem fully, Node's readline library should parse the ANSI escape sequences when setting _promptLength. To work around this problem, you can manually calculate the length of the prompt string without the escape sequences and pass that as the second argument to rl.setPrompt(prompt, length).

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