A wrapper for IO objects that allows a callback to be set which is called when an object is read from
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Wraps any IO
require "progressive_io" io = ProgressiveIO.new(File.open("/bigfile.dat")) do | pos, total_size | puts "Read %d bytes of %d" % [ pos, total_size ] end # Then, elsewhere deep in the calling code... io.each do | line | # Each yielded line will call the callback block # Do stuff end
For example, you can make any IO a provider for a [progressbar](rubygems.org/gem/progressbar)
require "progressive_io" require "progressbar" pbar = Progressbar.new("Pumping data", io.size) io_with_progress = ProgressiveIO.new(io) { |pos, total_size| pbar.set(pos) } # Then, elsewhere deep in the calling code... io_with_progress.each do | line | # Each yielded line will call the callback block # Each read operation will properly advance the progressbar end
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Ruby 1.8.6+
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gem install progressive_io
(The MIT License)
Copyright © 2011 Julik Tarkhanov <me@julik.nl>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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