linter.yml

name: ESLint

on:
    pull_request:
        branches: [master]

jobs:
    lint:
        name: Lint updated JavaScript files with ESLint

        runs-on: ubuntu-latest

        steps:
            - name: Checkout code
              uses: actions/checkout@v4
              with:
                  fetch-depth: 0
                  ref: ${{ github.event.pull_request.head.sha }}

            - name: Set up Node.js
              uses: actions/setup-node@v4
              with:
                  node-version: 20.x
                  cache: "npm"

            - name: Get changed JavaScript files
              id: get_files
              run: |
                  CHANGED_FILES=$(git diff --diff-filter=ACMRT --name-only ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }} -- '*.js')
                  echo "files<<EOF" >> $GITHUB_ENV
                  echo "$CHANGED_FILES" >> $GITHUB_ENV
                  echo "EOF" >> $GITHUB_ENV

            - name: Install dependencies
              run: npm ci

            - name: Run ESLint on changed files
              if: env.files != ''
              run: |
                  echo "Linting the following files:"
                  echo "$files"
                  echo "$files" | xargs npx eslint
            - name: Run Prettier check on changed files
              if: env.files != ''
              run: |
                  echo "Checking formatting for the following files:"
                  echo "$files"
                  echo "$files" | xargs npx prettier --check