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gem_patching's Introduction

gem_patching

gem_patching provides a mechanism for marking blocks of code as patches for specific versions of a specific gem. If the targeted gem is updated and it’s version does not match the targeted version any more, an exception is raised, notifying developers to evaluate whether the patch is still needed for the new version:

# cucumber_patch.rb
Gem.patching('cucumber', '0.8.0') do
  # your code patching cucumber '0.8.0'
end
# this will raise the following exception if cucumber is updated:
# Attempt to apply patch targeting version '0.8.0' of 'cucumber', but active version is '0.8.1'

Installation

gem install gem_patching

Copyright © 2010 Ingo Weiss, released under the MIT license

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gem_patching's Issues

Idiom and API Use

Neat idea. As a RubyGems maintainer, a few things you might want to tweak come to mind:

  • This isn't the normal file structure or gem name for a RubyGems (or any other well-behaved gem) plugin. If you'd like to follow our standard naming convention, the gem would be called gem-patching (dash, not underscore) and the code would live in lib/rubygems/patching.rb.
  • Consider changing the patching method's signature to patching(name, *requirements), using those arguments to create a Gem::Dependency, and using Gem.available? to check for your gem. This would allow use of all of RubyGems' normal version specifiers.
  • Consider showing a warning when the patch isn't going to be applied rather than raising an error.

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