tqdm-ruby

tqdm-ruby is a small utility to show a progress indicator while iterating through an Enumerable object.

It is a port of the excellent tdqm library for python.

Call #tqdm on any Enumerable, which enhances the object so that iterating over it will produce an animated progress bar on $stderr.

require 'tqdm'
(0...1000).tqdm.each { |x| sleep 0.01 }

The default output looks like this:

It works equally well from within irb, pry, and Jupyter notebooks.

Why not progressbar, ruby-progressbar, etc.? These have a bazillion formatting options and you typically have to update the progressbar object throughout other code. tqdm pleasantly encourages the laziest imaginable usage, in that you "set it and forget it".

Install

Install it globally from Rubygems:

$ gem install tqdm    # (might need sudo on OS X)

or add this line to your application's Gemfile:

gem 'tqdm'

And then execute:

$ bundle

Usage

All Enumerable objects gain access to the #tqdm method, which returns an enhanced object wherein any iteration (by calling #each or any of its relatives, e.g., #each_with_index, #each_with_object, etc.) produces an animated progress bar on $stderr.

Options can be provided for #tqdm:

require 'tqdm'
Hash[*(1..1000)].tqdm(desc: "working on it", leave: true).each { |x| sleep 0.01 }

The following options are available:

• desc: Short string, describing the progress, added to the beginning of the line
• total: Expected number of iterations, if not given, self.size is used
• file: A file-like object to output the progress message to, by default, $stderr
• leave: A boolean (default false). Should the progress bar should stay on screen after it's done?
• min_interval: Default is 0.5. If less than min_interval seconds or min_iters iterations have passed since the last progress meter update, it is not re-printed (decreases IO thrashing).
• min_iters: Default is 1. See previous.

Sequel is an amazing database library for Ruby. tqdm can enhance its Dataset objects to show progress while iterating (same options as above):

require 'tqdm/sequel'   # Automatically requires tqdm and sequel

# In-memory database for demonstration purposes
DB = Sequel.sqlite
DB.create_table :items do
  primary_key :id
  Float :price
end

# Show progress during big inserts (this isn't new)
(0..100000).tqdm.each { DB[:items].insert(price: rand * 100) }

# Show progress during long SELECT queries
DB[:items].where{ price > 10 }.tqdm.each { |row| "do some processing here" }

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request