Skunk

A RubyCritic extension to calculate SkunkScore for a file or project.

What is the SkunkScore?

The SkunkScore is a value that assesses the technical debt of a module. It takes into account:

• Code Complexity
• Code Smells
• Code Coverage

The main goal of the SkunkScore is to serve as a compass in your next refactoring adventure. It will help you answer these questions:

• What can I do to pay off technical debt?
• What are the most complicated files with the least code coverage?
• What are good candidates for your next test-writing efforts?
• What are good candidates for your next refactoring efforts?

The formula is not perfect and it is certainly controversial, so any feedback is welcome as a new issue!

Installation

Add this line to your application's Gemfile:

gem 'skunk'

And then execute:

$ bundle

Or install it yourself as:

$ gem install skunk

Usage

Help details

There are not that many options but here they are:

skunk -h
Usage: skunk [options] [paths]
    -b, --branch BRANCH              Set branch to compare
    -o, --out FILE                   Output report to file
    -v, --version                    Show gem's version
    -h, --help                       Show this message

Getting a sorted list of smelly files

To get the best results, make sure that you have coverage/.resultset.json in your application directory. That way skunk knows what's the status of your test suite + code coverage.

Then simply run:

skunk

Then get a list of smelly files:

$ skunk
running flay smells

running flog smells
.............
running reek smells
.............
running complexity
.............
running attributes
.............
running churn
.............
running simple_cov
.............
New critique at file:////Users/etagwerker/Projects/fastruby/skunk/tmp/rubycritic/overview.html
+-----------------------------------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+
| file                                                | skunk_score                | churn_times_cost           | churn                      | cost                       | coverage                   |
+-----------------------------------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+
| lib/skunk/cli/commands/default.rb                   | 166.44                     | 1.6643999999999999         | 3                          | 0.5548                     | 0                          |
| lib/skunk/cli/application.rb                        | 139.2                      | 1.392                      | 3                          | 0.46399999999999997        | 0                          |
| lib/skunk/cli/command_factory.rb                    | 97.6                       | 0.976                      | 2                          | 0.488                      | 0                          |
| test/test_helper.rb                                 | 75.2                       | 0.752                      | 2                          | 0.376                      | 0                          |
| lib/skunk/rubycritic/analysed_module.rb             | 48.12                      | 1.7184                     | 2                          | 0.8592                     | 72.72727272727273          |
| test/lib/skunk/cli/commands/status_reporter_test.rb | 45.6                       | 0.456                      | 1                          | 0.456                      | 0                          |
| lib/skunk/cli/commands/base.rb                      | 29.52                      | 0.2952                     | 3                          | 0.0984                     | 0                          |
| lib/skunk/cli/commands/status_reporter.rb           | 8.0                        | 7.9956                     | 3                          | 2.6652                     | 100.0                      |
| test/lib/skunk/rubycritic/analysed_module_test.rb   | 2.63                       | 2.6312                     | 2                          | 1.3156                     | 100.0                      |
| lib/skunk.rb                                        | 0.0                        | 0.0                        | 2                          | 0.0                        | 0                          |
| lib/skunk/cli/options.rb                            | 0.0                        | 0.0                        | 2                          | 0.0                        | 0                          |
| lib/skunk/version.rb                                | 0.0                        | 0.0                        | 2                          | 0.0                        | 0                          |
| lib/skunk/cli/commands/help.rb                      | 0.0                        | 0.0                        | 2                          | 0.0                        | 0                          |
+-----------------------------------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+

SkunkScore Total: 612.31
Modules Analysed: 13
SkunkScore Average: 0.47100769230769230769230769231e2
Worst SkunkScore: 166.44 (lib/skunk/cli/commands/default.rb)

The command will run rubycritic and it will try to load code coverage data from your coverage/.resultset.json file.

Skunk's report will be in the console. Use it wisely. :)

Comparing one branch vs. another

Simply run:

skunk -b <target-branch-name>

Then get a SkunkScore average comparison:

$ skunk -b master
Switched to branch 'master'
running flay smells
..
running flog smells
..............
running reek smells
..............
running complexity
..............
running attributes
..............
running churn
..............
running simple_cov
..............
Switched to branch 'feature/compare'
running flay smells
..
running flog smells
.................
running reek smells
.................
running complexity
.................
running attributes
.................
running churn
.................
running simple_cov
.................
Base branch (master) average skunk score: 290.53999999999996
Feature branch (feature/compare) average skunk score: 340.3005882352941
Score: 340.3

This should give you an idea if you're moving in the right direction or not.

Sharing results

If you want to quickly share the results of your report, you can use an environment variable:

SHARE=true skunk app/
...
SkunkScore Total: 126.99
Modules Analysed: 17
SkunkScore Average: 7.47
Worst SkunkScore: 41.92 (lib/skunk/cli/commands/status_sharer.rb)

Generated with Skunk v0.5.0
Shared at: https://skunk.fastruby.io/k

Results will be posted by default to https://skunk.fastruby.io which is a free and open source Ruby on Rails application sponsored by OmbuLabs (source code).

If you prefer to post results to your own server, you can do so:

SHARE_URL=https://path.to.your.skunk-fyi-server.example.com skunk app/
...
SkunkScore Total: 126.99
Modules Analysed: 17
SkunkScore Average: 7.47
Worst SkunkScore: 41.92 (lib/skunk/cli/commands/status_sharer.rb)

Generated with Skunk v0.5.0
Shared at: https://path.to.your.skunk-fyi-server.example.com/k

Known Issues

The SkunkScore should be calculated per method. This would provide a more accurate representation of the average SkunkScore in a module.

I think that the SkunkScore of a module should be the average of the SkunkScores of all of its methods.

Right now the SkunkScore is calculated using the totals for a module:

• Total Code Coverage Percentage per Module
• Total Churn per Module
• Total Cost per Module

For more details, feel free to review and improve this method: [RubyCritic::AnalysedModule#skunk_score]

Development

After checking out the repo, run bin/setup to install dependencies. 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.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/fastruby/skunk/issues.

Sponsorship

skunk is maintained and funded by FastRuby.io. The names and logos for FastRuby.io are trademarks of The Lean Software Boutique LLC.