119 lines
3.1 KiB
JavaScript
119 lines
3.1 KiB
JavaScript
// Simplified version of:
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// https://github.com/0x00A/prompt-sync/blob/master/index.js
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'use strict';
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var fs = require('fs');
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var term = 13; // carriage return
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function create() {
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return prompt;
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function prompt(ask, value, opts) {
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var insert = 0, savedinsert = 0, res, i, savedstr;
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opts = opts || {};
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if (Object(ask) === ask) {
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opts = ask;
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ask = opts.ask;
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} else if (Object(value) === value) {
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opts = value;
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value = opts.value;
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}
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ask = ask || '';
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var echo = opts.echo;
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var masked = 'echo' in opts;
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var fd = (process.platform === 'win32') ?
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process.stdin.fd :
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fs.openSync('/dev/tty', 'rs');
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var wasRaw = process.stdin.isRaw;
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if (!wasRaw) { process.stdin.setRawMode(true); }
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var buf = new Buffer(3);
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var str = '', character, read;
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savedstr = '';
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if (ask) {
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process.stdout.write(ask);
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}
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var cycle = 0;
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var prevComplete;
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while (true) {
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read = fs.readSync(fd, buf, 0, 3);
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if (read > 1) { // received a control sequence
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if (buf.toString()) {
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str = str + buf.toString();
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str = str.replace(/\0/g, '');
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insert = str.length;
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process.stdout.write('\u001b[2K\u001b[0G' + ask + str);
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process.stdout.write('\u001b[' + (insert + ask.length + 1) + 'G');
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buf = new Buffer(3);
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}
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continue; // any other 3 character sequence is ignored
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}
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// if it is not a control character seq, assume only one character is read
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character = buf[read - 1];
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// catch a ^C and return null
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if (character == 3){
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process.stdout.write('^C\n');
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fs.closeSync(fd);
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process.exit(130);
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process.stdin.setRawMode(wasRaw);
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return null;
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}
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// catch the terminating character
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if (character == term) {
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fs.closeSync(fd);
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break;
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}
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if (character == 127 || (process.platform == 'win32' && character == 8)) { //backspace
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if (!insert) {continue;}
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str = str.slice(0, insert - 1) + str.slice(insert);
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insert--;
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process.stdout.write('\u001b[2D');
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} else {
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if ((character < 32 ) || (character > 126))
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{continue;}
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str = str.slice(0, insert) + String.fromCharCode(character) + str.slice(insert);
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insert++;
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}
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if (masked) {
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process.stdout.write('\u001b[2K\u001b[0G' + ask + Array(str.length + 1).join(echo));
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} else {
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process.stdout.write('\u001b[s');
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if (insert == str.length) {
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process.stdout.write('\u001b[2K\u001b[0G' + ask + str);
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} else {
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if (ask) {
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process.stdout.write('\u001b[2K\u001b[0G' + ask + str);
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} else {
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process.stdout.write('\u001b[2K\u001b[0G' + str + '\u001b[' + (str.length - insert) + 'D');
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}
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}
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process.stdout.write('\u001b[u');
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process.stdout.write('\u001b[1C');
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}
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}
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process.stdout.write('\n');
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process.stdin.setRawMode(wasRaw);
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return str || value || '';
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}
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}
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module.exports = create;
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