Function ProgressBar

lib/node-progress.js:45–72

* Initialize a `ProgressBar` with the given `fmt` string and `options` or * `total`. * * Options: * * - `curr` current completed index * - `total` total number of ticks to complete * - `width` the displayed width of the progress bar defaulting to total * - `stream` the output stream

(fmt, options)

 */

function ProgressBar(fmt, options) {
  this.stream = options.stream || process.stderr;

  if (typeof(options) == 'number') {
    var total = options;
    options = {};
    options.total = total;
  } else {
    options = options || {};
    if ('string' != typeof fmt) throw new Error('format required');
    if ('number' != typeof options.total) throw new Error('total required');
  }

  this.fmt = fmt;
  this.curr = options.curr || 0;
  this.total = options.total;
  this.width = options.width || this.total;
  this.clear = options.clear
  this.chars = {
    complete   : options.complete || '=',
    incomplete : options.incomplete || '-',
    head       : options.head || (options.complete || '=')
  };
  this.renderThrottle = options.renderThrottle !== 0 ? (options.renderThrottle || 16) : 0;
  this.callback = options.callback || function () {};
  this.tokens = {};
  this.lastDraw = '';
}

/**
 * "tick" the progress bar with optional `len` and optional `tokens`.