[英]How do I implement tab completion in node.js shell?
I was looking for this feature in node.js and I haven't found it.我在 node.js 中寻找这个功能,但我没有找到它。
Can I implement it myself?我可以自己实现吗? As far as I know, node.js doesn't load any file at it's startup (like Bash does with
.bashrc
) and I haven't noticed any way to somehow override shell prompt.据我所知, node.js 在启动时不会加载任何文件(就像 Bash 对
.bashrc
所做的那样),我没有注意到任何方法可以以某种方式覆盖 Z2591C98B70119FE624898B1E424 提示。
Is there a way to implement it without writing custom shell?有没有办法在不编写自定义 shell 的情况下实现它?
You could monkey-patch the REPL.您可以对 REPL 进行猴子补丁。 Note that you must use the callback version of the
completer
, otherwise it won't work correctly:请注意,您必须使用
completer
的回调版本,否则将无法正常工作:
var repl = require('repl').start()
var _completer = repl.completer.bind(repl)
repl.completer = function(line, cb) {
// ...
_completer(line, cb)
}
Just as a reference.只是作为参考。
readline
module has readline.createInterface(options)
method that accepts an optional completer
function that makes a tab completion. readline
模块具有readline.createInterface(options)
方法,该方法接受一个可选的completer
器 function 来完成制表符。
function completer(line) {
var completions = '.help .error .exit .quit .q'.split(' ')
var hits = completions.filter(function(c) { return c.indexOf(line) == 0 })
// show all completions if none found
return [hits.length ? hits : completions, line]
}
and和
function completer(linePartial, callback) {
callback(null, [['123'], linePartial]);
}
link to the api docs: http://nodejs.org/api/readline.html#readline_readline_createinterface_options链接到 api 文档: http://nodejs.org/api/readline.html#readline_readline_createinterface_options
You can implement tab functionality using completer function like below.您可以使用完成器 function 来实现选项卡功能,如下所示。
const readline = require('readline');
/*
* This function returns an array of matched strings that starts with given
* line, if there is not matched string then it return all the options
*/
var autoComplete = function completer(line) {
const completions = 'var const readline console globalObject'.split(' ');
const hits = completions.filter((c) => c.startsWith(line));
// show all completions if none found
return [hits.length ? hits : completions, line];
}
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
completer: autoComplete
});
rl.setPrompt("Type some character and press Tab key for auto completion....\n");
rl.prompt();
rl.on('line', (data) => {
console.log(`Received: ${data}`);
});
Reference : https://self-learning-java-tutorial.blogspot.com/2018/10/nodejs-readlinecreateinterfaceoptions_2.html参考: https://self-learning-java-tutorial.blogspot.com/2018/10/nodejs-readlinecreateinterfaceoptions_2.html
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