README.md
# Rubocop Challenger
[](https://circleci.com/gh/ryz310/rubocop_challenger/tree/master) [](https://badge.fury.io/rb/rubocop_challenger) [](https://codeclimate.com/github/ryz310/rubocop_challenger/maintainability) [](https://codeclimate.com/github/ryz310/rubocop_challenger/test_coverage)
If you introduce [`rubocop`](https://github.com/rubocop-hq/rubocop) to an existing Rails project later, you will use [`$ rubocop --auto-gen-config`](https://github.com/rubocop-hq/rubocop/blob/master/manual/configuration.md#automatically-generated-configuration). But it will make a huge `.rubocop_todo.yml` and make you despair.
On the other hand, `rubocop` has [`--autocorrect`](https://github.com/rubocop-hq/rubocop/blob/master/manual/basic_usage.md#other-useful-command-line-flags) option, it is possible to automatically repair the writing which does not conform to the rule. But since it occasionally destroys your code, it is quite dangerous to apply all at once.
It is ideal that to remove a disabled rule from `.rubocop_todo.yml` every day, to check whether it passes test, and can be obtained consent from the team. But it requires strong persistence and time.
I call such work _Rubocop Challenge_. And the _RubocopChallenger_ is a gem to support this challenge!
## The history of RubocopChallenger with decrease of offense codes
The following chart shows the history of RubocopChallenger and decrease of offense codes at a `.rubocop_todo.yml`. The project was released at 5 years ago, and then it was introduced the RuboCop gem for huge source code including a lots of offense codes. Before using the RubocopChallenger, it was not maintain to reduce offense codes. One day, I felt a crisis and started maintain with manual. I made a lots of Pull Requests to reduce them but it's a load for me and reviewers. So I created a script for automation the flow, which is the predecessor of Rubocop Challenger gem. It brought reducing the offense codes continuously. After 8 months, finally it has done. There is no autocorrectable offense codes.
But there are many offenses which is un-autocorrectable yet. I will try to reduce it with the RubocopChallenger. The RubocopChallenger will
be continued to evolve.
## Rubocop Challenge Flow
1. Run _RubocopChallenger_ periodically from CI tool etc.
1. When _RubocopChallenger_ starts, delete a disabled rule from `.rubocop_todo.yml` existing in your project, execute `$ rubocop --autocorrect` and create a PR which include modified results
1. You confirm the PR passes testing and then merge it if there is no problem
[](https://github.com/ryz310/rubocop_challenger/pull/97)
## Usage
### 1. Configure .circleci/config.yml
Configure your `.circleci/config.yml` to run rubocop_challenger, for example:
```yml
# .circleci/config.yml
version: 2
jobs:
rubocop_challenge:
docker:
- image: circleci/ruby:3.0
working_directory: ~/repo
steps:
- checkout
- run:
name: Rubocop Challenge
command: |
gem install rubocop_challenger
rubocop_challenger go \
--email=rubocop-challenger@example.com \
--name="Rubocop Challenger"
workflows:
version: 2
nightly:
triggers:
- schedule:
cron: "30 23 * * 1,2,3" # 8:30am every Tuesday, Wednesday and Thursday (JST)
filters:
branches:
only:
- master
jobs:
- rubocop_challenge
```
**Should not append `gem 'rubocop_challenger'` on your Gemfile.**
I have seen cases where errors occur due to compatibility issues with other gems.
### 2. Setting GitHub personal access token
GitHub personal access token is required for sending pull requests to your repository.
1. Go to [your account's settings page](https://github.com/settings/tokens) and [generate a new token](https://github.com/settings/tokens/new) with "repo" scope
1. On [CircleCI](https://circleci.com) dashboard, go to your application's "Project Settings" -> "Environment Variables"
1. Add an environment variable `GITHUB_ACCESS_TOKEN` with your GitHub personal access token
### Want to use on GitHub Actions?
Here is a sample workflow:
```yml
name: "RuboCop Challenge"
on:
workflow_dispatch:
schedule:
# 10am PST Tuesdays and Thursdays
- cron: 0 17 * * 2,4
jobs:
create-rubocop-challenger-pr:
name: Create Rubocop Challenger Pull Request
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: ruby/setup-ruby@v1
with:
bundler-cache: true
- name: Set git configuration
run: git config remote.origin.url "git@github.com:your_org/your_repo.git"
- name: Create RuboCop challenge pull request
env:
GITHUB_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
run: |
gem install rubocop_challenger
rubocop_challenger go --email="rubocop-challenger@example.com" --name="Rubocop Challenger" --mode=random --only-exclude
```
You will need to make sure the following setting is enabled by going to Settings -> Actions -> General and checking `Allow GitHub Actions to create and approve pull requests`
<img width="828" alt="image" src="https://github.com/ryz310/rubocop_challenger/assets/2318938/f1dbe28d-d644-4dda-8ff3-938a5a3d1ae9">
## CLI command references
```sh
$ rubocop_challenger help
Commands:
rubocop_challenger go --email=EMAIL --name=NAME # Run `$ rubocop --autocorrect` and create a PR to GitHub repo
rubocop_challenger help [COMMAND] # Describe available commands or one specific command
rubocop_challenger version # Show current version
```
### Command-line Flags
```sh
$ rubocop_challenger help go
Usage:
rubocop_challenger go --email=EMAIL --name=NAME
Options:
--email=EMAIL # The Pull Request committer email
--name=NAME # The Pull Request committer name
f, [--file-path=FILE_PATH] # Set your ".rubocop_todo.yml" path
# Default: .rubocop_todo.yml
t, [--template=TEMPLATE] # A Pull Request template `erb` file path.You can use variable that `title`, `rubydoc_url`, `description` and `examples` into the erb file.
[--mode=MODE] # Mode to select deletion target. You can choice "most_occurrence", "least_occurrence", or "random". If you set --no-offense-counts, the mode to be forced to "random".
# Default: most_occurrence
b, [--base-branch=BASE_BRANCH] # The Branch to merge into
# Default: master
l, [--labels=one two three] # Label to give to Pull Request
# Default: ["rubocop challenge"]
[--project-column-name=PROJECT_COLUMN_NAME] # A project column name. You can add the created PR to the GitHub project
[--project-id=N] # A target project ID. If does not supplied, this method will find a project which associated the repository. When the repository has multiple projects, you should supply this.
[--create-pr], [--no-create-pr] # If you set --no-create-pr, no create a pull request (for testing)
# Default: true
[--exclude-limit=N] # For how many exclude properties on create .rubocop_todo.yml
[--auto-gen-timestamp], [--no-auto-gen-timestamp] # Include the date and time in .rubocop_todo.yml
# Default: true
[--offense-counts], [--no-offense-counts] # Include offense counts in .rubocop_todo.yml
# Default: true
[--only-safe-autocorrect], [--no-only-safe-autocorrect] # If given `true`, it executes `rubocop --autocorrect`,it means to correct safe cops only.
[--only-exclude], [--no-only-exclude] # If you set --only-exclude, exclude files instead of generating Max parameters in Metrics cops when creating .rubocop_todo.yml automatically.
[--verbose], [--no-verbose] # Displays executing command.
Run `$ rubocop --autocorrect` and create a PR to GitHub repo
```
## Requirement
- Ruby 2.7 or higher
## Development
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](https://rubygems.org).
## Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/ryz310/rubocop_challenger. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
## License
The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).
## Code of Conduct
Everyone interacting in the RubocopChallenger project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/ryz310/rubocop_challenger/blob/master/CODE_OF_CONDUCT.md).