Add head option to specify head character

lib/node-progress.js

@@ -19,6 +19,7 @@ exports = module.exports = ProgressBar;
  *   - `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
@@ -59,7 +60,8 @@ function ProgressBar(fmt, options) {
   this.clear = options.clear
   this.chars = {
     complete   : options.complete || '=',
-    incomplete : options.incomplete || '-'
+    incomplete : options.incomplete || '-',
+    head       : options.head || (options.complete || '=')
   };
   this.renderThrottle = options.renderThrottle !== 0 ? (options.renderThrottle || 16) : 0;
   this.callback = options.callback || function () {};
@@ -145,6 +147,10 @@ ProgressBar.prototype.render = function (tokens) {
   complete = Array(completeLength + 1).join(this.chars.complete);
   incomplete = Array(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);