Bundler::Dependencies

Bundler plugin to inspect dependencies of gems used by your project.

A project's Gemfile.lock shows some basic information about what gems are directly depended on by other gems, but this extension takes it a step further and enumerates the entire dependency tree of each gem being depended on. For instance, rails has 12 direct dependencies, but altogether installs 40 gems.

Each dependency is a potential point of failure, vulnerability, maintenance and complexity for a project, so the goal of bundle dependencies is to shed some light on what's being installed by what. This shouldn't stop you from installing gems that are useful to your project, but to be able to make an educated decision if a gem with 25 dependencies is a worthy tradeoff, for example.

Add this line to your application's Gemfile:

plugin 'bundler-graph'

And then execute:

$ bundle install

Alternately, you can install the plugin directly:

$ bundle plugin install bundle-dependencies

bundler dependencies [command]
                     [--path=PATH]                  # Path to Gemfile.lock to scan
                     [-W, --without=one two three]  # Gems to ignore
                     [-R, --without-rails]          # Ignore all Rails gems

Requires a Gemfile.lock or gems.locked file to evaluate.

NOTE: By default, bundler dependencies runs the count command.

• bundle dependencies help to get an overview of all commands.
• bundle dependencies help COMMAND to get help for a specific command.

Check how many dependencies each gem in the Gemfile has (use the --minimum N switch to limit the output to gems with at least N dependencies):

bundle dependencies [count] [--minimum N] 

Find all the gems in the Gemfile that depend on a given gem (either directly or indirectly), as well as all the dependency paths for that gem:

bundle dependencies find GEM

Get just the number of dependent gems:

bundle dependencies find GEM --quiet

See a graph of all dependencies:

bundle dependencies graph

See a graph of all dependencies for a specific gem:

bundle dependencies graph GEMNAME

The following options can be used with any command:

• --path PATH: User the Gemfile for the project at PATH, rather than the current project's Gemfile.
• --without foo bar baz/-W foo bar baz: Exclude the listed gems from the scan. Any uses either directly in your Gemfile or as dependencies will be excluded, and not be counted.
• --without-rails/-R: Quick option to exclude all 1st party Rails gems from the scan.

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. 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 tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/dvandersluis/bundler-dependencies.