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106 lines
3 KiB
Markdown
106 lines
3 KiB
Markdown
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Pry
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=============
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(C) John Mair (banisterfiend) 2010
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_attach an irb-like session to any object_
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Pry is a simple Ruby REPL that specializes in interactively manipulates objects during the running of the program.
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Based on some ideas found in this [Ruby-Forum thread](http://www.ruby-forum.com/topic/179060)
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`Tweak` provides the `using` method.
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* Install the [gem](https://rubygems.org/gems/tweak): `gem install tweak`
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* Read the [documentation](http://rdoc.info/github/banister/tweak/master/file/README.markdown)
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* See the [source code](http://github.com/banister/tweak)
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example: using
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-------------------------
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With the `using` method we can enhance a core class for the duration
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of a block:
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module Tweaks
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class String
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def hello
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:hello
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end
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end
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class Fixnum
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Hello = :hello
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def bye
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:bye
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end
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end
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end
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using Tweaks do
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"john".hello #=> :hello
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5.bye #=> :bye
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Fixnum::Hello #=> :hello
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end
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"john".hello #=> NameError
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How it works
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--------------
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Makes use of the `Remix` and `Object2module` libraries. Note that `Tweak`
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modifies core classes by what is effectively a module inclusion, this
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means you cannot use `Tweak` to override existing functionality but
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more to augment and supplement that functionality.
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`Tweak` works by doing the following:
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* Looks for top-level classes and modules with the same name as those
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defined under the using-module.
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* Uses `Object2module` to include the corresponding class/module
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defined under the using-module into the top-level class/module of the
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same name.
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* Uses `Remix` to uninclude that functionality at the end of the
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`using` block.
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Also look at the [Remix](http://github.com/banister/remix) library's
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`temp_include` and `temp_extend` methods for a more general solution than `Tweak`.
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Thread Safety
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--------------
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`Tweak` is not threadsafe.
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Limitations
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-----------
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Does not work with nested modules, e.g `class String::SomethingElse`
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This is not intended to be a robust or serious solution, it's just a
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little experiment. :)
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Companion Libraries
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--------------------
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Tweak is one of a series of experimental libraries that mess with
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the internals of Ruby to bring new and interesting functionality to
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the language, see also:
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* [Remix](http://github.com/banister/remix) - Makes ancestor chains read/write
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* [Object2module](http://github.com/banister/object2module) - Enables you to include/extend Object/Classes.
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* [Include Complete](http://github.com/banister/include_complete) - Brings in
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module singleton classes during an include. No more ugly ClassMethods and included() hook hacks.
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* [Prepend](http://github.com/banister/prepend) - Prepends modules in front of a class; so method lookup starts with the module
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* [GenEval](http://github.com/banister/gen_eval) - A strange new breed of instance_eval
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* [LocalEval](http://github.com/banister/local_eval) - instance_eval without changing self
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Contact
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-------
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Problems or questions contact me at [github](http://github.com/banister)
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