Bundler Stats
You remember that time someone yanked their library and the entire Node universe fell apart? Yeah, me too. And all the thinkpieces that came out just afterward were right: you should be careful about what dependencies you include in your project.
This project gives you some tools you can use with an existing Gemfile to determine which gems are including long trees of their own dependencies, and which you can potentially remove.
This is an exploratory tool, and I'd be interested to hear what other criteria would be useful in determining what tools to remove.
Installation
You don't need to include bundler-stats in your Gemfile, just
gem install bundler-stats. Unless you wanted to build automation around its
usage, in which case, add it to your Gemfile instead.
Usage
> bundle-stats help
Commands:
bundle-stats help [COMMAND] # Describe available commands or one specific command
bundle-stats show TARGET # Prints the dependency tree for a single gem in your Gemfile
bundle-stats stats # Displays basic stats about the gems in your Gemfile
bundle-stats version # Prints the bundler-stats version
bundle-stats versions TARGET # Shows versions requirements for target in other dependencies
Auditing Your Gemfile
The most obvious thing to do is run the command by itself, which should help identify problem areas.
> bundle-stats
+----------------------------|------------|----------------+
| Name | Total Deps | 1st Level Deps |
+----------------------------|------------|----------------+
| rails_admin | 60 | 12 |
| rails | 40 | 12 |
| compass-rails | 35 | 3 |
| haml-rails | 29 | 5 |
| rspec-rails | 27 | 7 |
| sass-rails | 26 | 5 |
| devise | 26 | 5 |
| scenic | 25 | 2 |
| coffee-rails | 25 | 2 |
| guard-rubocop | 24 | 2 |
| versionist | 23 | 3 |
| factory_bot_rails | 23 | 2 |
| ... omitted stuff here ... |
+----------------------------|------------|----------------+
Declared Gems 56
Total Gems 170
Unpinned Versions 54
Github Refs 0
It looks like rails_admin is a huge problem. Use show to investigate.
> bundle-stats show rails_admin
bundle-stats for rails_admin
+--------------------------------|----------------------------------------+
| Depended Upon By (0) | |
| Depends On (60) | builder, coffee-rails |
| | font-awesome-rails, haml, jquery-rails |
| | jquery-ui-rails, kaminari, nested_form |
| | rack-pjax, rails, remotipart |
| | sass-rails, coffee-script, railties |
| | coffee-script-source, execjs |
| | actionpack, activesupport |
| | method_source, rake, thor, actionview |
| | rack, rack-test, rails-dom-testing |
| | rails-html-sanitizer, erubi |
| | concurrent-ruby, i18n, minitest |
| | tzinfo, thread_safe, nokogiri |
| | mini_portile2, loofah, crass, temple |
| | tilt, kaminari-actionview |
| | kaminari-activerecord, kaminari-core |
| | activerecord, activemodel, arel |
| | actioncable, actionmailer, activejob |
| | activestorage, bundler |
| | sprockets-rails, nio4r |
| | websocket-driver, websocket-extensions |
| | mail, globalid, mini_mime, marcel |
| | mimemagic, sprockets, sass |
| Unique to This (9) | font-awesome-rails, kaminari |
| | nested_form, rack-pjax, remotipart |
| | kaminari-actionview |
| | kaminari-activerecord, kaminari-core |
| | bundler |
+--------------------------------|----------------------------------------+
Skipping Common Dependencies
Let's take a look at another common gem to rails codebases. In this case, we have some unique dependencies, but also many dependencies on rails, and on its constituent gems.
> bundle-stats show compass-rails
bundle-stats for compass-rails
+--------------------------------|----------------------------------------+
| Depended Upon By (0) | |
| Depends On (35) | compass, sass-rails, sprockets |
| | chunky_png, compass-core |
| | compass-import-once, rb-fsevent |
| | rb-inotify, sass, multi_json, ffi |
| | railties, sprockets-rails, tilt |
| | actionpack, activesupport, method_source |
| | rake, thor, actionview, rack, rack-test |
| | rails-dom-testing, rails-html-sanitizer |
| | builder, erubi, concurrent-ruby, i18n |
| | minitest, tzinfo, thread_safe, nokogiri |
| | mini_portile2, loofah, crass |
| Unique to This (3) | compass, compass-core |
| | compass-import-once |
+--------------------------------|----------------------------------------+
We're not looking to remove rails, so there's not much point in including it
within this output. Instead, we can use the nofollow flag to skip it in all
output lists.
> bundle-stats show compass-rails --nofollow="railties,activeupport,actionview,actionpack"
bundle-stats for compass-rails
+--------------------------------|----------------------------------------+
| Depended Upon By (0) | |
| Depends On (20) | compass, sass-rails, sprockets |
| | chunky_png, compass-core |
| | compass-import-once, rb-fsevent |
| | rb-inotify, sass, multi_json, ffi |
| | sprockets-rails, tilt, concurrent-ruby |
| | rack, activesupport, i18n, minitest |
| | tzinfo, thread_safe |
| Unique to This (3) | compass, compass-core |
| | compass-import-once |
+--------------------------------|----------------------------------------+
This is better, but for other codebases it's common for gems to depend on each of the many many child gems of rails individually. Rather than specifying each by itself, we can use wildcards to remove them in bulk.
> bundle-stats show compass-rails --nofollow="rail*,action*,active*"
bundle-stats for compass-rails
+--------------------------------|----------------------------------------+
| Depended Upon By (0) | |
| Depends On (15) | compass, sass-rails, sprockets |
| | chunky_png, compass-core |
| | compass-import-once, rb-fsevent |
| | rb-inotify, sass, multi_json, ffi |
| | sprockets-rails, tilt, concurrent-ruby |
| | rack |
| Unique to This (3) | compass, compass-core |
| | compass-import-once |
+--------------------------------|----------------------------------------+
Showing Required Versions
Sometimes you try to upgrade a gem, you ask bundler very nicely, but you find that the version hasn't changed. When that happens, sometimes it's not clear why the gem version isn't changing.
In that case, use versions to list all required dependencies on your gem.
> bundle-stats versions actionpack
version dependencies for actionpack
Depended Upon By 24
Resolved Version 5.2.0
+----------------------------|------------------+
| Name | Required Version |
+----------------------------|------------------+
| webpacker | = 5.2.0 |
| actionmailer | = 5.2.0 |
| activestorage | = 5.2.0 |
| coffee-rails | = 5.2.0 |
| compass-rails | = 5.2.0 |
| devise | = 5.2.0 |
| factory_bot_rails | = 5.2.0 |
| font-awesome-rails | = 5.2.0 |
| rails_admin | = 5.2.0 |
| railties | = 5.2.0 |
| sass-rails | = 5.2.0 |
| scenic | = 5.2.0 |
| versionist | = 5.2.0 |
| actioncable | = 5.2.0 |
| jquery-rails | = 5.2.0 |
| jquery-ui-rails | = 5.2.0 |
| jquery_file_download-rails | = 5.2.0 |
| rails | = 5.2.0 |
| rspec-rails | >= 3.0 |
| sprockets-rails | >= 4.0 |
| haml-rails | >= 4.0.1 |
| responders | >= 4.2.0, < 5.3 |
| simple_form | >= 5.0 |
| rails-controller-testing | ~> 5.x, >= 5.0.1 |
+----------------------------|------------------+
Output Formats
To consume information with a build job or somesuch, all commands can emit JSON.
> bundle-stats show sass-rails --nofollow="railties,activesupport,actionpack" -f json
{
"name": "sass-rails",
"total_dependencies": 9,
"first_level_dependencies": 5,
"top_level_dependencies": {
"compass-rails": "compass-rails (3.1.0)",
"rails_admin": "rails_admin (1.3.0)"
},
"transitive_dependencies": [
"railties (< 6, >= 4.0.0)",
"sass (~> 3.1)",
"sprockets (< 4.0, >= 2.8)",
"sprockets-rails (< 4.0, >= 2.0)",
"tilt (< 3, >= 1.1)",
"concurrent-ruby (~> 1.0)",
"rack (< 3, > 1)",
"actionpack (>= 4.0)",
"activesupport (>= 4.0)"
],
"potential_removals": [
]
}
Custom Gemfile path
This gem by default attempts to locate the Gemfile and Gemfile.lock files in parent directories. If you want to specify a specific location for your Gemfile/gems.rb file, you can use the --gemfile_path option.
> bundle-stats show sass-rails --gemfile_path=/Users/user/project/Gemfile
Keep in mind that the location of the Gemfile.lock/gems.locked file will be inferred from the location of the Gemfile/gems.rb file.
Contributing
Contributions are very welcome. Fork, fix, submit pulls.
Contribution is expected to conform to the Contributor Covenant.
Credits
Thanks to the many kind people at RailsCamp East 2016 for the help, the ideas, and the support.
Also, many other folks for their feature / fix contributions.
License
This software is released under the MIT License.