react-native/local-cli/generator/promptSync.js

118 lines
3.1 KiB
JavaScript

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