validate_pr.yml

name: Validate PR
on: pull_request

defaults:
  run:
    shell: bash
    working-directory: project

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      # checkout code
      - name: Checkout
        uses: actions/checkout@v3
        with:
          path: project
          fetch-depth: 2
      # checkout schema as xmllint can't https 
      - name: Checkout schema repo
        uses: actions/checkout@v3
        with:
          repository: BetaMasaheft/Schema
          path: schema
      - name: Install Test Dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y libxml2-utils
      # Compare locally changed files to PR's base
      - name: Check for changed source files
        id: changed
        run: |
          echo "::set-output name=files::$( \
            git diff --name-only --diff-filter=ACMRT \
            ${{ github.event.pull_request.base.sha }} \
            ${{ github.sha }} -- ':./**/*.xml' ':!./**/transkribus*.xml' ':!./**/facsimile*.xml' ':!./**/edition.xml'  ':!./**/msDesc.xml' ':!./**/*text.xml' | xargs)"
      # Validate changed files against latest schema
      - name: Validate changed source files
        if: ${{ steps.changed.outputs.files != '' }}
        run: |
          xmllint \
            --noout --xinclude --nowarning \
            --relaxng ../schema/tei-betamesaheft.rng \
            ${{ steps.changed.outputs.files }} \
            2>&1 | \
            { grep -vE 'RNG|validates' || :; }
      # If no xml files were modified
      - name: No source files changed
        if: ${{ steps.changed.outputs.files == '' }}
        run: |
          echo "All good"
      # ensure branch conaints only well-formed xml files 
      - name: Ensure all XML files are well formed
        run: |
          xmllint --noout \
            $(find . -type f -name '*.xml')