Term::Progress

Terminal progress bars and indicators for Crystal.

Term::Progress provides single progress bars, coordinated multi-bar displays, transfer meters, formatter tokens, and spinner integration for terminal tasks.

Installation

1. Add the dependency to your shard.yml:

   dependencies:
     term-progress:
       github: crystal-term/progress
       version: ~> 1.0.0

2. Run shards install

Usage

First require the library:

require "term-progress"

bar = Term::Progress::Bar.new(total: 100_i64)

100.times do
  bar.advance
end

bar.finish("Complete!")

Use format to choose what the bar renders. Built-in tokens include :bar, :blocks, :dots, :percent, :current, :total, :fraction, :elapsed, :eta, :rate, :mean_rate, :byte_rate, and :mean_byte_rate.

require "term-progress"

bar = Term::Progress::Bar.new(
  total: 1024_i64,
  format: "Downloading [:bar] :percent :byte_rate ETA: :eta"
)

bar.update(256_i64)
bar.finish("Downloaded!")

Custom tokens can be added with update_tokens and referenced from the format string.

require "term-progress"

bar = Term::Progress::Bar.new(
  total: 50_i64,
  format: ":title [:bar] :current/:total (:percent)"
)

bar.update_tokens(title: "Processing files")
bar.advance(25_i64)
bar.finish("Done!")

Multiple Bars

Term::Progress::Multi manages several bars as one display.

require "term-progress"

multi = Term::Progress::Multi.new("Overall Progress [:bar] :percent")

download_bar = multi.register("Download [:bar] :byte_rate", total: 500_i64)
install_bar = multi.register("Install  [:bar] :percent", total: 100_i64)

download_bar.advance(250_i64)
install_bar.advance(50_i64)

multi.finish_all("All tasks completed!")

Meter

Term::Progress::Meter tracks rates, mean rates, elapsed time, and ETA values. Bars expose their meter through #meter.

require "term-progress"

meter = Term::Progress::Meter.new

meter.update(1024_i64)
sleep(10.milliseconds)
meter.update(4096_i64)

puts meter.format_rate(meter.mean_rate)
puts meter.format_time(meter.elapsed_time.total_seconds)

Spinner Integration

Include the :spinner token in a bar format to animate it with term-spinner frames.

require "term-progress"

bar = Term::Progress::Bar.new(
  total: 100_i64,
  format: ":spinner [:bar] :percent :current/:total",
  spinner_format: :dots
)

bar.advance(10_i64)
bar.finish("done")

Configuration

These options can be supplied to Term::Progress::Bar.new:

• total: total units of work, default 100
• format: display template, default "[:bar] :percent :current/:total"
• width: rendered bar width, default based on terminal width
• complete_char, incomplete_char, head_char: progress bar characters
• output: destination IO, default STDERR
• spinner_format, spinner_frames, spinner_interval: spinner token options

Built-in format templates are available in Term::Progress::Formatters::FORMATS: default, minimal, download, tasks, classic, and detailed.

Examples

Runnable examples live in examples/:

• basic.cr for single progress bars
• custom_tokens.cr for dynamic token updates
• formatters.cr for built-in formats and character sets
• multi_bars.cr and multi_tree.cr for coordinated bars
• rates_and_timing.cr for meter output
• spinner_integration.cr and single_with_spinner.cr for spinner tokens