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+/*!
+ * node-progress
+ * Copyright(c) 2011 TJ Holowaychuk <tj@vision-media.ca>
+ * MIT Licensed
+ */
+
+/**
+ * Expose `ProgressBar`.
+ */
+
+exports = module.exports = ProgressBar;
+
+/**
+ * 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 defaulting to stderr
+ *   - `head` head character defaulting to complete character
+ *   - `complete` completion character defaulting to "="
+ *   - `incomplete` incomplete character defaulting to "-"
+ *   - `renderThrottle` minimum time between updates in milliseconds defaulting to 16
+ *   - `callback` optional function to call when the progress bar completes
+ *   - `clear` will clear the progress bar upon termination
+ *
+ * Tokens:
+ *
+ *   - `:bar` the progress bar itself
+ *   - `:current` current tick number
+ *   - `:total` total ticks
+ *   - `:elapsed` time elapsed in seconds
+ *   - `:percent` completion percentage
+ *   - `:eta` eta in seconds
+ *   - `:rate` rate of ticks per second
+ *
+ * @param {string} fmt
+ * @param {object|number} options or total
+ * @api public
+ */
+
+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.lastRender = -Infinity;
+  this.callback = options.callback || function () {};
+  this.tokens = {};
+  this.lastDraw = '';
+}
+
+/**
+ * "tick" the progress bar with optional `len` and optional `tokens`.
+ *
+ * @param {number|object} len or tokens
+ * @param {object} tokens
+ * @api public
+ */
+
+ProgressBar.prototype.tick = function(len, tokens){
+  if (len !== 0)
+    len = len || 1;
+
+  // swap tokens
+  if ('object' == typeof len) tokens = len, len = 1;
+  if (tokens) this.tokens = tokens;
+
+  // start time for eta
+  if (0 == this.curr) this.start = new Date;
+
+  this.curr += len
+
+  // try to render
+  this.render();
+
+  // progress complete
+  if (this.curr >= this.total) {
+    this.render(undefined, true);
+    this.complete = true;
+    this.terminate();
+    this.callback(this);
+    return;
+  }
+};
+
+/**
+ * Method to render the progress bar with optional `tokens` to place in the
+ * progress bar's `fmt` field.
+ *
+ * @param {object} tokens
+ * @api public
+ */
+
+ProgressBar.prototype.render = function (tokens, force) {
+  force = force !== undefined ? force : false;
+  if (tokens) this.tokens = tokens;
+
+  if (!this.stream.isTTY) return;
+
+  var now = Date.now();
+  var delta = now - this.lastRender;
+  if (!force && (delta < this.renderThrottle)) {
+    return;
+  } else {
+    this.lastRender = now;
+  }
+
+  var ratio = this.curr / this.total;
+  ratio = Math.min(Math.max(ratio, 0), 1);
+
+  var percent = Math.floor(ratio * 100);
+  var incomplete, complete, completeLength;
+  var elapsed = new Date - this.start;
+  var eta = (percent == 100) ? 0 : elapsed * (this.total / this.curr - 1);
+  var rate = this.curr / (elapsed / 1000);
+
+  /* populate the bar template with percentages and timestamps */
+  var str = this.fmt
+    .replace(':current', this.curr)
+    .replace(':total', this.total)
+    .replace(':elapsed', isNaN(elapsed) ? '0.0' : (elapsed / 1000).toFixed(1))
+    .replace(':eta', (isNaN(eta) || !isFinite(eta)) ? '0.0' : (eta / 1000)
+      .toFixed(1))
+    .replace(':percent', percent.toFixed(0) + '%')
+    .replace(':rate', Math.round(rate));
+
+  /* compute the available space (non-zero) for the bar */
+  var availableSpace = Math.max(0, this.stream.columns - str.replace(':bar', '').length);
+  if(availableSpace && process.platform === 'win32'){
+    availableSpace = availableSpace - 1;
+  }
+
+  var width = Math.min(this.width, availableSpace);
+
+  /* TODO: the following assumes the user has one ':bar' token */
+  completeLength = Math.round(width * ratio);
+  complete = Array(Math.max(0, completeLength + 1)).join(this.chars.complete);
+  incomplete = Array(Math.max(0, width - completeLength + 1)).join(this.chars.incomplete);
+
+  /* add head to the complete string */
+  if(completeLength > 0)
+    complete = complete.slice(0, -1) + this.chars.head;
+
+  /* fill in the actual progress bar */
+  str = str.replace(':bar', complete + incomplete);
+
+  /* replace the extra tokens */
+  if (this.tokens) for (var key in this.tokens) str = str.replace(':' + key, this.tokens[key]);
+
+  if (this.lastDraw !== str) {
+    this.stream.cursorTo(0);
+    this.stream.write(str);
+    this.stream.clearLine(1);
+    this.lastDraw = str;
+  }
+};
+
+/**
+ * "update" the progress bar to represent an exact percentage.
+ * The ratio (between 0 and 1) specified will be multiplied by `total` and
+ * floored, representing the closest available "tick." For example, if a
+ * progress bar has a length of 3 and `update(0.5)` is called, the progress
+ * will be set to 1.
+ *
+ * A ratio of 0.5 will attempt to set the progress to halfway.
+ *
+ * @param {number} ratio The ratio (between 0 and 1 inclusive) to set the
+ *   overall completion to.
+ * @api public
+ */
+
+ProgressBar.prototype.update = function (ratio, tokens) {
+  var goal = Math.floor(ratio * this.total);
+  var delta = goal - this.curr;
+
+  this.tick(delta, tokens);
+};
+
+/**
+ * "interrupt" the progress bar and write a message above it.
+ * @param {string} message The message to write.
+ * @api public
+ */
+
+ProgressBar.prototype.interrupt = function (message) {
+  // clear the current line
+  this.stream.clearLine();
+  // move the cursor to the start of the line
+  this.stream.cursorTo(0);
+  // write the message text
+  this.stream.write(message);
+  // terminate the line after writing the message
+  this.stream.write('\n');
+  // re-display the progress bar with its lastDraw
+  this.stream.write(this.lastDraw);
+};
+
+/**
+ * Terminates a progress bar.
+ *
+ * @api public
+ */
+
+ProgressBar.prototype.terminate = function () {
+  if (this.clear) {
+    if (this.stream.clearLine) {
+      this.stream.clearLine();
+      this.stream.cursorTo(0);
+    }
+  } else {
+    this.stream.write('\n');
+  }
+};