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Contents
require 'ostruct'
module ZTK
# Spinner Error Class
#
# @author Zachary Patten <zachary AT jovelabs DOT com>
class SpinnerError < Error; end
# Spinner Class
#
# This class can be used to display an "activity indicator" to a user while
# a task is executed in the supplied block. This indicator takes the form
# of a spinner.
#
# @author Zachary Patten <zachary AT jovelabs DOT com>
class Spinner
class << self
# Spinner Character Set
CHARSET = %w( | / - \\ )
# UI Spinner
#
# Displays a "spinner" while executing the supplied block. It is
# advisable that no output is sent to the console during this time.
#
# @param [Hash] options Configuration options hash.
# @option options [Float,Integer] :step (0.1) How long to sleep for in
# between cycles, while cycling through the *CHARSET*.
#
# @yield Block should execute the tasks for which they wish the user to
# have a false sense of security in the fact that something is actually
# taking place "behind the scenes".
# @return [Object] The return value of the block.
#
# @author Zachary Patten <zachary AT jovelabs DOT com>
# @author Stephen Nelson-Smith <stephen@atalanta-systems.com>
def spin(options={}, &block)
options = Base.build_config({
:step => 0.1
}.merge(options))
options.ui.logger.debug { "options(#{options.send(:table).inspect})" }
!block_given? and Base.log_and_raise(options.ui.logger, SpinnerError, "You must supply a block!")
count = 0
spinner = Thread.new do
while count do
options.ui.stdout.print(CHARSET[(count += 1) % CHARSET.length])
options.ui.stdout.print("\b")
options.ui.stdout.respond_to?(:flush) and options.ui.stdout.flush
sleep(options.step)
end
end
yield.tap do
count = false
spinner.join
end
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems