在Node.js的readline shell中清除终端窗口 [英] Clear terminal window in Node.js readline shell
问题描述
我有一个简单的readline shell写在Coffeescript:
rl = require'readline'
cli = rl.createInterface process.stdin,process.stdout,null
cli.setPrompthello>
cli.on'line',(line) - >
console.log line
cli.prompt()
cli.prompt()
运行此操作会显示提示符:
$ coffee cli.coffee
hello>
我想能够点击 Ctrl-L
清除屏幕。这是可能的吗?
我也注意到,我不能在节点中找到 Ctrl-L
我在Ubuntu 11.04上运行。
过程中,您可以自行观看按键,并清除屏幕。 .stdin.on'keypress',(s,key) - >
if key.ctrl&&& key.name =='l'
process.stdout.write'\\\ [2J\\\ [0; 0f'
清除是使用ASCII控制序列完成的,如下所示:
http://ascii-table.com/ansi-escape-sequences-vt-100.php
第一个代码 \\\ [2J
指示终端自行清除,第二个 \\\ [0; 0f
到位置0,0。
注
keypress
event不再是Node > = 0.10.x
中标准Node API的一部分,但您可以使用 keypress 模块。
I have a simple readline shell written in Coffeescript:
rl = require 'readline'
cli = rl.createInterface process.stdin, process.stdout, null
cli.setPrompt "hello> "
cli.on 'line', (line) ->
console.log line
cli.prompt()
cli.prompt()
Running this displays a prompt:
$ coffee cli.coffee
hello>
I would like to be able to hit Ctrl-L
to clear the screen. Is this possible?
I have also noticed that I cannot hit Ctrl-L
in either the node or coffee REPLs either.
I am running on Ubuntu 11.04.
You can watch for the keypress yourself and clear the screen.
process.stdin.on 'keypress', (s, key) ->
if key.ctrl && key.name == 'l'
process.stdout.write '\u001B[2J\u001B[0;0f'
Clearing is done with ASCII control sequences like those written here: http://ascii-table.com/ansi-escape-sequences-vt-100.php
The first code \u001B[2J
instructs the terminal to clear itself, and the second one \u001B[0;0f
forces the cursor back to position 0,0.
Note
The keypress
event is no longer part of the standard Node API in Node >= 0.10.x
but you can use the keypress module instead.
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