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
TTY::Spinner by default uses :classic
type of formatter and requires no parameters:
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 synchronize multiple spinners:
spinners = TTY::Spinner::Multi.new("[:spinner] top")
sp1 = spinners.register "[:spinner] one"
# or sp1 = ::TTY::Spinner.new("[:spinner] one")
# spinners.register sp1
sp2 = spinners.register "[:spinner] two"
sp1.auto_spin
sp2.auto_spin
sleep(2) # Perform work
sp1.success
sp2.success
The spinners 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).
After calling auto_spin
you can pause spinner execution:
spinner.pause
You can continue any paused spinner:
spinner.resume
Use run
passing a block with a job that will automatically display spinning animation while the block executes and finish animation when the block terminates. The block yields a spinner instance.
spinner.run do |spinner|
...
end
Optionally you can provide a stop message to display when animation is finished.
spinner.run("Done!") do |spinner|
...
end
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 check mark 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 spinning 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)
The spinner will not write any output if the output stream is not a TTY. You can check this with:
spinner.tty?
To output log messages to the console above a spinner use the log
method:
spinner.log("Print this log message to the console")
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")
The spinner only outputs to a console and when output is redirected to a file or a pipe it does nothing. This is so, for example, your error logs do not overflow with spinner output.
You can change where console output is streamed with :output
option:
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)
# or
# spinner = ::TTY::Spinner.new("[:spinner] one")
# sp1 = multi_spinner.register(spinner)
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.
To create a top level spinner that tracks activity of all the registered spinners, the multispinner has to have been given a message on initialization:
multi_spinner = TTY::Spinner::Multi.new("[:spinner] Top level spinner")
The top level multi spinner will perform spinning animation automatically when at least one of the registered spinners starts spinning.
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
(see manual).
Alternatively, you can register spinners with tasks that will automatically animate and finish spinners when respective tasks are done (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 have full control over multiple spinners, you will need to perform all actions manually.
For example, create a multi spinner that will track status of all registered spinners:
multi_spinner = TTY::Spinner::Multi.new("[:spinner] top")
and then register spinners with their formats:
spinner_1 = spinners.register "[:spinner] one"
spinner_2 = spinners.register "[:spinner] two"
Once registered, you can set spinners running in separate threads:
spinner_1.auto_spin
spinner_2.auto_spin
Finally, you need to stop each spinner manually, in our case we mark the second spinner as failure which in turn will stop the top level multi spinner automatically and mark it as failure:
spinner_1.success
spinner_2.error
The result may look like this:
┌ [✖] top
├── [✔] one
└── [✖] two
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:
multi_spinner = TTY::Spinner::Multi.new("[:spinner] top")
and then register spinners with their respective tasks:
multi_spinner.register("[:spinner] one") { |sp| sleep(2); sp.success("yes 2") }
multi_spinner.register("[:spinner] two") { |sp| sleep(3); sp.error("no 2") }
Finally, call #auto_spin
to kick things off:
multi_spinner.auto_spin
If any of the child spinner stops with error then the top level spinner will be marked as failure.
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 a check mark 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 spinning 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: "|__ "
})
Bug reports and pull requests are welcome on GitHub at https://github.com/piotrmurach/tty-spinner. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.
git checkout -b my-new-feature
)git commit -am 'Add some feature'
)git push origin my-new-feature
)Everyone interacting in the TTY::Spinner project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.
Copyright (c) 2014 Piotr Murach. See LICENSE for further details.