TTY::Spinner

A terminal spinner for tasks that have non-deterministic time frame.

TTY::Spinner provides independent spinner component for TTY toolkit.

Add this line to your application's Gemfile:

gem 'tty-spinner'

And then execute:

$ bundle

Or install it yourself as:

$ gem install tty-spinner

• 1. Usage
• 2. TTY::Spinner API
  • 2.1 spin
  • 2.2 auto_spin
  • 2.3 run
  • 2.4 start
  • 2.5 stop
    • 2.5.1 success
    • 2.5.2 error
  • 2.6 update
  • 2.7 reset
  • 2.8 join
• 3. Configuration
  • 3.1 :format
  • 3.2 :frames
  • 3.3 :interval
  • 3.4 :hide_cursor
  • 3.5 :clear
  • 3.6 :success_mark
  • 3.7 :error_mark
  • 3.8 :output
• 4. Events
  • 4.1 done
  • 4.2 success
  • 4.3 error
• 5. TTY::Spinner::Multi API
  • 5.1 reigster
  • 5.2 auto_spin
    • 5.2.1 async tasks
  • 5.3 stop
    • 5.3.1 success
    • 5.3.2 error
  • 5.4 :style

TTY::Spinner by default uses :classic type of formatter and requires no paramters:

spinner = TTY::Spinner.new

In addition you can provide a message with :spinner token and format type you would like for the spinning display:

spinner = TTY::Spinner.new("[:spinner] Loading ...", format: :pulse_2)

spinner.auto_spin # Automatic animation with default interval

sleep(2) # Perform task

spinner.stop('Done!') # Stop animation

This would produce animation in your terminal:

⎺ Loading ...

and when finished output:

_ Loading ... Done!

Use TTY::Spinner::Multi to synchornize multiple spinners:

spinners = TTY::Spinner::Multi.new("[:spinner] top")

sp1 = spinners.register "[:spinner] one"
sp2 = spinners.register "[:spinner] two"

sp1.auto_spin
sp2.auto_spin

sleep(2) # Perform work

sp1.success
sp2.success

which when done will display:

┌[✔]] top
├──[✔] one
└──[✔] two

For more usage examples please see examples directory

The main workhorse of the spinner is the spin method.

Looping over spin method will animate a given spinner.

loop do
  spinner.spin
end

To perform automatic spinning animation use auto_spin method like so:

spinner.auto_spin

The speed with which the spinning happens is determined by the :interval parameter. All the spinner formats have their default intervals specified (see).

Use run with a code block that will automatically display spinning animation while the block executes and finish animation when the block terminates. Optionally you can provide a stop message to display when animation is finished.

spinner.run('Done!') { ... }

In order to set start time or reuse the same spinner after it has stopped, call start method:

spinner.start

In order to stop the spinner call stop. This will finish drawing the spinning animation and return to new line.

spinner.stop

You can further pass a message to print when animation is finished.

spinner.stop('Done!')

Use success call to stop the spinning animation and replace the spinning symbol with checkmark character to indicate successful completion.

spinner = TTY::Spinner.new("[:spinner] Task name")
spinner.success('(successful)')

This will produce:

[✔] Task name (successful)

Use error call to stop the spining animation and replace the spinning symbol with cross character to indicate error completion.

spinner = TTY::Spinner.new("[:spinner] Task name")
spinner.error('(error)')

This will produce:

[✖] Task name (error)

Use update call to dynamically change label name(s).

Provide an arbitrary token name(s) in the message string, such as :title

spinner = TTY::Spinner.new("[:spinner] :title")

and then pass token name and value:

spinner.update(title: 'Downloading file1')

next start animation:

spinner.run { ... }
# => | Downloading file1

Once animation finishes you can kick start another one with a different name:

spinner.update(title: 'Downloading file2')
spinner.run { ... }

In order to reset the spinner to its initial frame do:

spinner.reset

One way to wait while the spinning animates is to join the thread started with start method:

spinner.join

Optionally you can provide timeout:

spinner.join(0.5)

There are number of configuration options that can be provided to customise the behaviour of a spinner.

Use one of the predefined spinner styles by passing the formatting token :format

spinner = TTY::Spinner.new(format: :pulse_2)

All spinner formats that TTY::Spinner accepts are defined in /lib/tty/spinner/formats.rb

If you wish to see all available formats in action run the formats.rb file in examples folder like so:

bundle exec ruby examples/formats.rb

If you wish to use custom formatting use the :frames option with either array or string of characters.

spinner = TTY::Spinner.new(frames: [".", "o", "0", "@", "*"])

The :interval option accepts integer representing number of Hz units, for instance, frequency of 10 will mean that the spinning animation will be displayed 10 times per second.

spinner = TTY::Spinner.new(interval: 20) # 20 Hz (20 times per second)

Hides cursor when spinning animation performs. Defaults to false.

spinner = TTY::Spinner.new(hide_cursor: true)

After spinner is finished clears its output. Defaults to false.

spinner = TTY::Spinner.new(clear: true)

To change marker indicating successful completion use the :success_mark option:

spinner = TTY::Spinner.new(success_mark: '+')

To change marker indicating error completion use the :error_mark option:

spinner = TTY::Spinner.new(error_mark: 'x')

To change where data is streamed use :output option like so:

spinner = TTY::Spinner.new(output: $stdout)

The output stream defaults to stderr.

TTY::Spinner emits :done, :success and :error event types when spinner is stopped.

This event is emitted irrespective of the completion method. In order to listen for this event you need to register callback:

spinner.on(:done) { ... }

This event is fired when success call is made. In order to respond to the event, you need to register callback:

spinner.on(:success) { ... }

This event is fired when error completion is called. In order to respond to the event, you need to register callback:

spinner.on(:error) { ... }

Create and register a TTY::Spinner under the multispinner

new_spinner = multi_spinner.register("[:spinner] Task 1 name", options)

If no options are given it will use the options given to the multi_spinner when it was initialized to create the new spinner. If options are passed, they will override any options given to the multi spinner.

The multispinner has to have been given a message on initialization. To perform automatic spinning animation use auto_spin method like so:

multi_spinner = TTY::Spinner::Multi.new("[:spinner] Top level spinner")
multi_spinner.auto_spin

If you register spinners without any tasks then you will have to manually control when the multi_spinner finishes by calling stop, success or error. Alternatively you can register spinners with tasks (see async tasks)

The speed with which the spinning happens is determined by the :interval parameter. All the spinner formats have their default intervals specified (see).

In case when you wish to execute async tasks and update individual spinners automatically, in any order, about their task status use #register and pass additional block parameter with the job to be executed.

For example, create a multi spinner that will track status of all registered spinners:

spinners = TTY::Spinner::Multi.new("[:spinner] top")

and then register spinners with their respective tasks:

spinners.register("[:spinner] one") { |sp| sleep(2); sp.success('yes 2') }
spinners.register("[:spinner] two") { |sp| sleep(3); sp.error('no 2') }

Finally, call #auto_spin to kick things off:

spinners.auto_spin

In order to stop the multi spinner call stop. This will stop the top level spinner, if it exists, and any sub-spinners still spinning.

multi_spinner.stop

Use success call to stop the spinning animation and replace the spinning symbol with checkmark character to indicate successful completion. This will also call #success on any sub-spinners that are still spinning.

multi_spinner.success

Use error call to stop the spining animation and replace the spinning symbol with cross character to indicate error completion. This will also call #error on any sub-spinners that are still spinning.

multi_spinner.error

In addition to all configuration options you can style multi spinner like so:

multi_spinner = TTY::Spinner::Multi.new("[:spinner] parent", style: {
  top: '. '
  middle: '|-> '
  bottom: '|__ '
})

1. Fork it ( https://github.com/piotrmurach/tty-spinner/fork )
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 a new Pull Request

Copyright (c) 2014-2017 Piotr Murach. See LICENSE for further details.