www.aleph1.co.uk Git - yaffs-website/blob - node_modules/beeper/index.js

   1 'use strict';
   2
   3 var BEEP_DELAY = 500;
   4
   5 function beep() {
   6         process.stdout.write('\u0007');
   7 }
   8
   9 function melodicalBeep(val, cb) {
  10         if (val.length === 0) {
  11                 cb();
  12                 return;
  13         }
  14
  15         setTimeout(function () {
  16                 if (val.shift() === '*') {
  17                         beep();
  18                 }
  19
  20                 melodicalBeep(val, cb);
  21         }, BEEP_DELAY);
  22 }
  23
  24 module.exports = function (val, cb) {
  25         if (!process.stdout.isTTY ||
  26                 process.argv.indexOf('--no-beep') !== -1 ||
  27                 process.argv.indexOf('--beep=false') !== -1) {
  28                 return;
  29         }
  30
  31         cb = cb || function () {};
  32
  33         if (val === parseInt(val)) {
  34                 if (val < 0) {
  35                         throw new TypeError('Negative numbers are not accepted');
  36                 }
  37
  38                 if (val === 0) {
  39                         cb();
  40                         return;
  41                 }
  42
  43                 for (var i = 0; i < val; i++) {
  44                         setTimeout(function (i) {
  45                                 beep();
  46
  47                                 if (i === val - 1) {
  48                                         cb();
  49                                 }
  50                         }, BEEP_DELAY * i, i);
  51                 }
  52         } else if (!val) {
  53                 beep();
  54                 cb();
  55         } else if (typeof val === 'string') {
  56                 melodicalBeep(val.split(''), cb);
  57         } else {
  58                 throw new TypeError('Not an accepted type');
  59         }
  60 };