Add new :wheel token

Readme.md

@@ -44,6 +44,7 @@ These are keys in the options object you can pass to the progress bar along with
 These are tokens you can use in the format of your progress bar.
 
 - `:bar` the progress bar itself
+- `:wheel` rotating progress indicator
 - `:current` current tick number
 - `:total` total ticks
 - `:elapsed` time elapsed in seconds

examples/indeterminable.js

@@ -7,7 +7,7 @@ var ProgressBar = require('../');
 
 // simulated download, passing the chunk lengths to tick()
 
-var bar = new ProgressBar(' [:bar] :current/:total :elapseds :percent :etas', {
+var bar = new ProgressBar(' [:wheel][:bar] :current/:total :elapseds :percent :etas', {
     complete: '='
   , incomplete: ' '
   , width: 50

lib/node-progress.js

@@ -28,6 +28,7 @@ exports = module.exports = ProgressBar;
  * Tokens:
  *
  *   - `:bar` the progress bar itself
+ *   - `:wheel` rotating progress indicator
  *   - `:current` current tick number
  *   - `:total` total ticks
  *   - `:elapsed` time elapsed in seconds
@@ -150,6 +151,7 @@ ProgressBar.prototype.render = function (tokens) {
 
   /* populate the bar template with percentages and timestamps */
   var str = this.fmt
+    .replace(':wheel', this.complete ? '+' : ['/', '-', '\\', '|'][this.updates % 4])
     .replace(':current', this.curr)
     .replace(':total', this.total > 0 ? this.total : '?')
     .replace(':elapsed', isNaN(elapsed) ? '0.0' : (elapsed / 1000).toFixed(1))