ruby-lint.yml

name: Ruby Lint

on:
  workflow_call:
    secrets:
      BUNDLE_RUBYGEMS__PKG__GITHUB__COM:
        description: "The GitHub token to use for private gem sources"
        required: true

jobs:
  lint:
    runs-on: ubuntu-latest
    env:
      BUNDLE_RUBYGEMS__PKG__GITHUB__COM: ${{ secrets.BUNDLE_RUBYGEMS__PKG__GITHUB__COM }}

    steps:
      - uses: actions/checkout@v4

      - uses: ruby/setup-ruby@v1
        with:
          bundler-cache: true

      - name: Get base and head
        id: base-head
        run: |
          git fetch origin ${{ github.base_ref }} ${{ github.event.pull_request.head.ref }}
          echo "FORK_POINT=$(git show-branch --merge-base "origin/${{ github.base_ref }}" "origin/${{ github.event.pull_request.head.ref }}")" >> "$GITHUB_OUTPUT"
          echo "LATEST_COMMIT_IN_PR=${{ github.event.pull_request.head.sha }}" >> "$GITHUB_OUTPUT"

      - name: Get changed Ruby files
        env:
          FORK_POINT: ${{ steps.base-head.outputs.FORK_POINT }}
          LATEST_COMMIT_IN_PR: ${{ steps.base-head.outputs.LATEST_COMMIT_IN_PR }}
          RUBY_PATTERN: (\.r[bu]|\.gemspec|\.podspec|\.jbuilder|\.rake|Gemfile|Rakefile|Capfile|Guardfile|Podfile|Thorfile|Vagrantfile)$
        id: changed-files
        run: |
          echo "CHANGED_RUBY_FILES=$(git diff --diff-filter=ACMR --name-only $FORK_POINT $LATEST_COMMIT_IN_PR | grep -E $RUBY_PATTERN | tr '\n' ' ')" >> "$GITHUB_OUTPUT"

      - name: Rubocop on changed files
        env:
          CHANGED_RUBY_FILES: ${{ steps.changed-files.outputs.CHANGED_RUBY_FILES }}
        run: |
          if [ -n "$CHANGED_RUBY_FILES" ]; then
            bundle exec rubocop $CHANGED_RUBY_FILES
          fi