chef

https://github.com/opscode/chef

Ruby

A systems integration framework, built to bring the benefits of configuration management to your entire infrastructure.

Chef::Provider::Package::Rubygems::GemEnvironment#candidate_version_from_file

Determines the candidate version for a gem from a .gem file on disk
and checks if it matches the version constraints in +gem_dependency+
=== Returns
Gem::Version  a singular gem version object is returned if the gem
              is available
nil           returns nil if the gem on disk doesn't match the
              version constraints for +gem_dependency+

Source | Google | Stack overflow

Edit

git clone [email protected]:opscode/chef.git

cd chef

open lib/chef/provider/package/rubygems.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Chef--Provider--Package--Rubygems--GemEnvironment-candidate_version_from_file-for-pr

# Commit to git

git add lib/chef/provider/package/rubygems.rbgit commit -m "better docs for Chef::Provider::Package::Rubygems::GemEnvironment#candidate_version_from_file"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Chef--Provider--Package--Rubygems--GemEnvironment-candidate_version_from_file-for-pr

hub pull-request

# Celebrate!