Gibbler - v0.10.0

Git-like hashes and history for Ruby objects for Ruby 1.9+, 2.7+ and JRuby.

Check out this post on RubyInside.

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Installation

Install the gem and add to the application's Gemfile by executing:

$ bundle add gibbler

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install gibbler

Usage

Example 1 -- Standalone Usage

    require 'gibbler'

    g = Gibbler.new 'id', 1001   # => f4fb3796ababa3788d1bded8fdc589ab1ccb1c3d
    g.base(36)                   # => sm71s7eam4hm5jlsuzlqkbuktwpe5h9

    g == 'f4fb3796ababa3788d1bded8fdc589ab1ccb1c3d'   # => true
    g === 'f4fb379'              # => true

Example 2 -- Mixins Usage

    require 'gibbler/mixins'

    "kimmy".gibbler              # => c8027100ecc54945ab15ddac529230e38b1ba6a1
    :kimmy.gibbler               # => 52be7494a602d85ff5d8a8ab4ffe7f1b171587df

    config = {}
    config.gibbler               # => 4fdcadc66a38feb9c57faf3c5a18d5e76a6d29bf
    config.gibbled?              # => false

    config[:server] = {
      :users => [:dave, :ali],
      :ports => [22, 80, 443]
    }
    config.gibbled?              # => true
    config.gibbler               # => ef23d605f8c4fc80a8e580f9a0e8dab8426454a8

    config[:server][:users] << :yanni

    config.gibbler               # => 4c558a56bc2abf5f8a845a69e47ceb5e0003683f

    config.gibbler.short         # => 4c558a56

    config.gibbler.base36        # => 8x00l83jov4j80i9vfzpaxr9jag23wf

    config.gibbler.base36.short  # => 8x00l83j

Example 3 -- Object History

Gibbler can also keep track of the history of changes to an object. By default Gibbler supports history for Hash, Array, and String objects. The gibbler_commit method creates a clone of the current object and stores in an instance variable using the current hash digest as the key.

    require 'gibbler/mixins'
    require 'gibbler/history'

    a = { :magic => :original }
    a.gibbler_commit             # => d7049916ddb25e6cc438b1028fb957e5139f9910

    a[:magic] = :updated
    a.gibbler_commit             # => b668098e16d08898532bf3aa33ce2253a3a4150e

    a[:magic] = :changed
    a.gibbler_commit             # => 0b11c377fccd44554a601e5d2b135c46dc1c4cb1

    a.gibbler_history            # => d7049916, b668098e, 0b11c377

    a.gibbler_revert! 'd7049916' # Return to a specific commit
    a.gibbler                    # => d7049916ddb25e6cc438b1028fb957e5139f9910
    a                            # => { :magic => :original }

    a.delete :magic

    a.gibbler_revert!            # Return to the previous commit
    a.gibbler                    # => 0b11c377fccd44554a601e5d2b135c46dc1c4cb1
    a                            # => { :magic => :changed }


    a.gibbler_object 'b668098e'  # => { :magic => :updated }
    a.gibbler_stamp              # => 2009-07-01 18:56:52 -0400

Example 4 -- Method Aliases

If you have control over the namespaces of your objects, you can use the method aliases to tighten up your code a bit. The "gibbler" and "gibbled?" methods can be accessed via "digest" and "changed?", respectively. (The reason they're not enabled by default is to avoid conflicts.)

    require 'gibbler/aliases'

    "kimmy".digest               # => c8027100ecc54945ab15ddac529230e38b1ba6a1
    :kimmy.digest                # => 52be7494a602d85ff5d8a8ab4ffe7f1b171587df

    a = [:a, :b, :c]
    a.digest                     # => e554061823b8f06367555d1ee4c25b4ffee61944
    a << :d
    a.changed?                   # => true

The history methods also have aliases which remove the "gibbler_" prefix.

    require 'gibbler/aliases'
    require 'gibbler/history'

    a = { :magic => :original }
    a.commit
    a.history
    a.revert!
    # etc...

Example 5 -- Different Digest types

By default Gibbler creates SHA1 hashes. You can change this globally or per instance.

    require 'gibbler/mixins'

    Gibbler.digest_type = Digest::MD5

    :kimmy.gibbler               # => 0c61ff17f46223f355759934154d5dcb

    :kimmy.gibbler(Digest::SHA1) # => 52be7494a602d85ff5d8a8ab4ffe7f1b171587df

In Jruby, you can grab the digest types from the openssl library.

    require 'openssl'

    Gibbler.digest_type = OpenSSL::Digest::SHA256

    :kimmy.gibbler               # => 1069428e6273cf329436c3dce9b680d4d4e229d7b7...

Example 6 -- All your base

    require 'gibbler/mixins'

    :kimmy.gibbler               # => 52be7494a602d85ff5d8a8ab4ffe7f1b171587df
    :kimmy.gibbler.base(16)      # => 52be7494a602d85ff5d8a8ab4ffe7f1b171587df
    :kimmy.gibbler.base(36)      # => 9nydr6mpv6w4k8ngo3jtx0jz1n97h7j

    :kimmy.gibbler.base(10)      # => 472384540402900668368761869477227308873774630879
    :kimmy.gibbler.to_i          # => 472384540402900668368761869477227308873774630879

Example 7 -- Global secret

Gibbler can prepend all digest inputs with a global secret. You can set this once per project to ensure your project's digests are unique.

    require 'gibbler/mixins'

    :kimmy.gibbler               # => 52be7494a602d85ff5d8a8ab4ffe7f1b171587df

    Gibbler.secret = "sUp0r5ekRu7"

    :kimmy.gibbler               # => 6c5f5aff4d809cec7e7da091214a35a2698489f8

Supported Classes

Gibbler methods are available only to the classes which explicitly include them [see docs'(https://delanotes.com/gibbler) for details on which classes are supported by default). You can also extend custom objects:

    class FullHouse
      include Gibbler::Complex
      attr_accessor :roles
    end

    a = FullHouse.new
    a.gibbler                    # => 4192d4cb59975813f117a51dcd4454ac16df6703

    a.roles = [:jesse, :joey, :danny, :kimmy, :michelle, :dj, :stephanie]
    a.gibbler                    # => 6ea546919dc4caa2bab69799b71d48810a1b48fa

Gibbler::Complex creates a digest based on the name of the class and the names and values of the instance variables. See the RDocs[http://delano.github.com/gibbler] for other Gibbler::* types.

If you want to support all Ruby objects, add the following to your application:

    class Object
      include Gibbler::String
    end

Gibbler::String creates a digest based on the name of the class and the output of the to_s method. This is a reasonable default for most objects however any object that includes the object address in to_s (e.g. "Object:0x0x4ac9f0...") will produce unreliable digests (because the address can change).

As of 0.7 all Proc objects have the same digest: 12075835e94be34438376cd7a54c8db7e746f15d.

Some things to keep in mind

• Digest calculation may change between minor releases (as it did between 0.6 and 0.7)
• Gibbler history is not suitable for very large objects since it keeps complete copies of the object in memory. This is a very early implementation of this feature so don't rely on it for production code.
• Don't forget to enjoy your life!

What People Are Saying

• "nice approach - everything is an object, every object is 'gittish'" -- @olgen_morten
• "gibbler is just awesome" -- @TomK32
• "wie cool ist Gibbler eigentlich?" -- @we5
• "it's nice idea and implementation!" --HristoHristov

Development

After checking out the repo, run bin/setup to install dependencies. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome GitHub Issues. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

Thanks

• Kalin Harvey (krrh) for the early feedback and artistic direction.
• Alex Peuchert (aaalex) for creating the screencast.

Code of Conduct

Everyone interacting in the Gibbler project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.

Credits

Gibbler was created by Delano Mandelbaum.

License

The gem is available as open source under the terms of the MIT License.