This is PowerBar - The last progressbar-library you’ll ever need.

• Detects when stdout is not a terminal and automatically falls back to logging

  • Does not clutter your log-files with ansi-codes!

  • If your CLI-app can run interactively and non-interactively (e.g. cronjob) you will automatically get reasonable progress-output in both modes.

  • By default prints to stderr but can call any output-method of your choice (e.g. your favorite Logger).

• Fully customizable; all output is template-driven.

• All output is optional. You may set PowerBar to silently collect progress information (percentage-done, throughput, ETA, etc.) and then use the computed values elsewhere in your app.

• All state can be updated at any time. For example: If you’re monitoring a multi-part operation then you can change the status-message of a running PowerBar to reflect the current state.

gem install powerbar

Watch the demo that was installed along with the gem:

powerbar-demo

Then look at the source-code of the demo. Pretty much all use-cases are covered in there, including templates and how to hook in your own logger.

#!/usr/bin/env ruby

require 'powerbar'

total = 100000
step = 1000

p = PowerBar.new

# Override some defaults to demonstrate how the settings work
p.settings.tty.finite.template.barchar = '*'
p.settings.tty.finite.template.padchar = '.'

# Dummy loop to simulate some progress
(0..total).step(step).each do |i|
  p.show(:msg => 'DEMO 1 - Ten seconds of progress', :done => i, :total => total)
  sleep 0.1
end
p.close

Use the source, Luke!

Copyright © 2011 by [email protected]

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