How do I implement tab completion in node.js shell?
You could monkey-patch the REPL. Note that you must use the callback version of the completer, otherwise it won't work correctly:
var repl = require('repl').start()var _completer = repl.completer.bind(repl)repl.completer = function(line, cb) { // ... _completer(line, cb)}
Just as a reference.
readline module has readline.createInterface(options) method that accepts an optional completer function that makes a tab completion.
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
function completer(linePartial, callback) { callback(null, [['123'], linePartial]);}link to the api docs: http://nodejs.org/api/readline.html#readline_readline_createinterface_options
You can implement tab functionality using completer function like below.
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}`);});