如何编辑终端中的现有文本（并移动光标）？

I saw this demo once that printed out a paragraph of text (like you'd get when typing some-command --help), and it then jumped back up to a couple keywords in the text and changed the text color, after it was already printed out in the terminal.

我看过这个演示，打印出一段文字（就像你在输入some-command --help时得到的那样），然后它跳回到文本中的几个关键字并改变文本颜色，之后已经在终端打印出来了。

That seems crazy to me. How did they do that?

这对我来说似乎很疯狂。他们是怎么做到的？

Starting to think about it, I guess stdout and stdin are technically an "IO stream", so maybe that's a persistent variable that keeps track of the position of a cursor? I remember doing something like that when building a language parser.

开始考虑它，我猜stdout和stdin在技术上是一个“IO流”，所以也许这是一个跟踪光标位置的持久变量？我记得在构建语言解析器时做了类似的事情。

The goal would be this: say you type the following into the console, and it outputs a blank array because in Node.js, it's all async and we don't want to write the async function everytime in the console:

目标是这样的：假设您在控制台中键入以下内容，并输出一个空白数组，因为在Node.js中，它都是异步的，我们不想每次在控制台中编写异步函数：

$ node app.js
> App.User.all()
=> []

Then when the async callback executes, you go back and edit the => [] to include the result:

然后当执行异步回调时，您返回并编辑=> []以包含结果：

$ node app.js
> App.User.all()
=> [#<User id:1>, #<User id:2>...]

That would be awesome to at least know how to implement, even if there are a lot of other issues to work through (unrelated to this question. And I know you can define a global callback and do something like App.User.all(_c)).

即使有很多其他问题需要解决，这至少知道如何实现也是很棒的（与这个问题无关。我知道你可以定义一个全局回调并执行类似App.User.all（_c）的操作））。

How do you edit the terminal output after it's already been printed?

如何在打印后编辑终端输出？

2 个解决方案

#1

Finally found that "demo":

终于找到了“demo”：

https://github.com/asyncly/cdir/blob/223fe0039fade4fad2bb08c2f7affac3bdcf2f89/cdir.js#L24
https://github.com/asyncly/cdir/blob/223fe0039fade4fad2bb08c2f7affac3bdcf2f89/cdir.js#L24
http://tldp.org/HOWTO/Bash-Prompt-HOWTO/x361.html
http://tldp.org/HOWTO/Bash-Prompt-HOWTO/x361.html
http://ascii-table.com/ansi-escape-sequences-vt-100.php

http://ascii-table.com/ansi-escape-sequences-vt-100.php
Position the Cursor: \033[<L>;<C>H or \033[<L>;<C>f (puts the cursor at line L and column C)

定位光标：\ 033 [ ; H或\ 033 [ ; f（将光标置于L行和C列）
Move the cursor up N lines: \033[<N>A
将光标向上移动N行：\ 033 [ A
Move the cursor down N lines: \033[<N>B
将光标向下移动N行：\ 033 [ B
Move the cursor forward N columns: \033[<N>C
将光标向前移动N列：\ 033 [ C
Move the cursor backward N columns: \033[<N>D
向后移动光标N列：\ 033 [ D.
Clear the screen, move to (0,0): \033[2J
清除屏幕，移至（0,0）：\ 033 [2J
Erase to end of line: \033[K
擦除到行尾：\ 033 [K.
Save cursor position: \033[s
保存光标位置：\ 033 [s
Restore cursor position: \033[u
恢复光标位置：\ 033 [u

#2

If you are working in Mac OX X, I believe the program Eddie does something like "edit terminal output after it's already been printed". (see "Eddie (text editor) at Wikipedia" ).

如果您使用的是Mac OX X，我相信Eddie程序会执行“在已经打印后编辑终端输出”之类的操作。（参见“*的Eddie（文本编辑器）”）。

Under the file menu, choose "New" and then under "Settings/Document Settings..." choose "Shell Window". After that try a couple of unix commands: date, ls, cal, etc. Then put your cursor and edit these.

在文件菜单下，选择“新建”，然后在“设置/文档设置...”下选择“外壳窗口”。之后尝试几个unix命令：date，ls，cal等。然后放上光标并编辑它们。

I would have tried with Node but I could not install it (Node) under Mac OS X 10.5.8.

我会尝试使用Node但我无法在Mac OS X 10.5.8下安装它（Node）。

#1