--- /dev/null
+#!/usr/bin/env node
+
+var assert = require('assert')
+ , ansi = require('../../')
+
+function Progress (stream, width) {
+ this.cursor = ansi(stream)
+ this.delta = this.cursor.newlines
+ this.width = width | 0 || 10
+ this.open = '['
+ this.close = ']'
+ this.complete = '█'
+ this.incomplete = '_'
+
+ // initial render
+ this.progress = 0
+}
+
+Object.defineProperty(Progress.prototype, 'progress', {
+ get: get
+ , set: set
+ , configurable: true
+ , enumerable: true
+})
+
+function get () {
+ return this._progress
+}
+
+function set (v) {
+ this._progress = Math.max(0, Math.min(v, 100))
+
+ var w = this.width - this.complete.length - this.incomplete.length
+ , n = w * (this._progress / 100) | 0
+ , i = w - n
+ , com = c(this.complete, n)
+ , inc = c(this.incomplete, i)
+ , delta = this.cursor.newlines - this.delta
+
+ assert.equal(com.length + inc.length, w)
+
+ if (delta > 0) {
+ this.cursor.up(delta)
+ this.delta = this.cursor.newlines
+ }
+
+ this.cursor
+ .horizontalAbsolute(0)
+ .eraseLine(2)
+ .fg.white()
+ .write(this.open)
+ .fg.grey()
+ .bold()
+ .write(com)
+ .resetBold()
+ .write(inc)
+ .fg.white()
+ .write(this.close)
+ .fg.reset()
+ .write('\n')
+}
+
+function c (char, length) {
+ return Array.apply(null, Array(length)).map(function () {
+ return char
+ }).join('')
+}
+
+
+
+
+// Usage
+var width = parseInt(process.argv[2], 10) || process.stdout.getWindowSize()[0] / 2
+ , p = new Progress(process.stdout, width)
+
+;(function tick () {
+ p.progress += Math.random() * 5
+ p.cursor
+ .eraseLine(2)
+ .write('Progress: ')
+ .bold().write(p.progress.toFixed(2))
+ .write('%')
+ .resetBold()
+ .write('\n')
+ if (p.progress < 100)
+ setTimeout(tick, 100)
+})()