name: "Checking EditorConfig"

permissions: read-all

on:
  # avoids approving first time contributors
  pull_request_target:
    branches-ignore:
      - 'release-**'

jobs:
  tests:
    runs-on: ubuntu-latest
    if: github.repository_owner == 'NixOS'
    steps:
    - name: Get list of changed files from PR
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        echo 'PR_DIFF<<EOF' >> $GITHUB_ENV
        gh api \
          repos/NixOS/nixpkgs/pulls/${{github.event.number}}/files --paginate \
          | jq '.[] | select(.status != "removed") | .filename' \
          >> $GITHUB_ENV
        echo 'EOF' >> $GITHUB_ENV
    - uses: actions/checkout@v2
      with:
        # pull_request_target checks out the base branch by default
        ref: refs/pull/${{ github.event.pull_request.number }}/merge
      if: env.PR_DIFF
    - uses: cachix/install-nix-action@v13
      if: env.PR_DIFF
      with:
        # nixpkgs commit is pinned so that it doesn't break
        nix_path: nixpkgs=https://github.com/NixOS/nixpkgs/archive/f93ecc4f6bc60414d8b73dbdf615ceb6a2c604df.tar.gz
    - name: install editorconfig-checker
      run: nix-env -iA editorconfig-checker -f '<nixpkgs>'
      if: env.PR_DIFF
    - name: Checking EditorConfig
      if: env.PR_DIFF
      run: |
        echo "$PR_DIFF" | xargs editorconfig-checker -disable-indent-size
    - if: ${{ failure() }}
      run: |
        echo "::error :: Hey! It looks like your changes don't follow our editorconfig settings. Read https://editorconfig.org/#download to configure your editor so you never see this error again."