Policial 👮

Policial is a gem that investigates pull requests and accuses style guide violations. It is based on thoughtbot's Hound project. It currently supports RuboCop, SCSS and CoffeeLint.

Add this line to your application's Gemfile:

gem 'policial'

And then execute:

$ bundle

Or install it yourself as:

$ gem install policial

1. First, instantiate a new Detective:

detective = Policial::Detective.new

You might need to pass an Octokit client with your GitHub credentials. For more information on this please check the Octokit README.

octokit = Octokit::Client.new(access_token: 'mygithubtoken666')
detective = Policial::Detective.new(octokit)

If you don't pass an Octokit client Policial will use the global Octokit configuration.

2. Let's investigate! Start by briefing your detective about the pull request it will run an investigation against. You can setup a pull request manually:

detective.brief(
  repo: 'volmer/my_repo',
  number: 3,
  head_sha: 'headsha'
)

N. B. It's important to configure auto pagination for your client to receive reliable results on PRs with lot of files.

Or you can brief it with a GitHub pull_request webhook:

event = Policial::PullRequestEvent.new(webhook_payload)
detective.brief(event)

3. Now you can run the investigation using the linters you want:

# Let's investigate this pull request and get a list of violations:
result = detective.investigate(linters: [Policial::Linters::RuboCop.new])
result.violations
# => [#<Policial::Violation:0x007ff0b5abad30 @filename="lib/test.rb", @line_number=1, ...>]

result.violations.first.message
"Prefer single-quoted strings when you don't need string interpolation or special symbols."

You can setup your RuboCop code style rules with a .rubocop.yml file in your repo. Please see RuboCop's README.

You can setup your CoffeeLint code style rules with a coffeelint.json file in your repo. For more information on how customize the linter rules please visit the Coffeelint website.

SCSS linting is disabled by default. To enable it, you need to install the SCSS-Lint gem:

gem install scss_lint

Or add the following to your Gemfile and run bundle install:

gem 'scss_lint', require: false

The require: false is necessary because scss-lint monkey patches Sass. More info here.

Now you can use the SCSSLint linter when calling Detective#investigate:

violations = detective.investigate(linters: [Policial::Linters::SCSSLint.new])

You can setup your SCSS code style rules with a .scss-lint.yml file in your repo. For more information on how customize the linter rules please read SCSS-Lint's README.

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request