Ruby/ProgressBar: A Text Progress Bar Library for Ruby

Ruby/ProgressBar is a text progress bar library for Ruby. It can indicate progress with percentage, a progress bar, and estimated remaining time.

Ruby/DbProgressBar is an extensions of the above ProgressBar to write output to the database instead of to the console. Implemented for Sequel ORM, but can be easily extended to other ORMs such as ActiveRecord or DataMapper

Examples

% irb --simple-prompt -r progressbar
>> pbar = ProgressBar.new("test", 100)
=> (ProgressBar: 0/100)
>> 100.times {sleep(0.1); pbar.inc}; pbar.finish
test:          100% |oooooooooooooooooooooooooooooooooooooooo| Time: 00:00:10
=> nil

>> pbar = ProgressBar.new("test", 100)
=> (ProgressBar: 0/100)
>> (1..100).each{|x| sleep(0.1); pbar.set(x)}; pbar.finish
test:           67% |oooooooooooooooooooooooooo              | ETA:  00:00:03


>> DB = Sequel.sqlite(File.join(ROOT_DIR, 'demo.db'))
>> SequelOutput.prepare_database(DB)
>> total = 15
>> pbar = DbProgressBar.new("job #1", total, SequelOutput.new(1, DB))
>> total.times do
>>   pbar.inc
>>   sleep(1)
>> end
>> pbar.finish

>> puts DB[:progress_bars].filter(:unique_id => 1).first[:progress_text]
job #1:       100% |oooooooooooooooooooooooooooooooooooooooo| Time: 00:00:15

API

• ProgressBar#new(title, total, out = STDERR)

  Display the initial progress bar and return a ProgressBar object. title specifies the title, and total specifies the total cost of processing. Optional parameter out specifies the output IO.

  The display of the progress bar is updated when one or more percent is proceeded or one or more seconds are elapsed from the previous display.

• ProgressBar#inc(step = 1)

  Increase the internal counter by step and update the display of the progress bar. Display the estimated remaining time on the right side of the bar. The counter does not go beyond the total.

• ProgressBar#set(count)

  Set the internal counter to count and update the display of the progress bar. Display the estimated remaining time on the right side of the bar. Raise if count is a negative number or a number more than the total.

• ProgressBar#finish

  Stop the progress bar and update the display of progress bar. Display the elapsed time on the right side of the bar. The progress bar always stops at 100% by the method.

• ProgressBar#halt

  Stop the progress bar and update the display of progress bar. Display the elapsed time on the right side of the bar. The progress bar stops at the current percentage by the method.

• ProgressBar#format=

  Set the format for displaying a progress bar. Default: "%-14s %3d%% %s %s".

• ProgressBar#format_arguments=

  Set the methods for displaying a progress bar. Default: [:title, :percentage, :bar, :stat].

• ProgressBar#file_transfer_mode

  Use :stat_for_file_transfer instead of :stat to display transfered bytes and transfer rate.

ReverseProgressBar class is also available. The functionality is identical to ProgressBar but the direction of the progress bar is just opposite.

Limitations

Since the progress is calculated by the proportion to the total cost of processing, Ruby/ProgressBar cannot be used if the total cost of processing is unknown in advance. Moreover, the estimation of remaining time cannot be accurately performed if the progress does not flow uniformly.

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Satoru Takabayashi