pr_diff.yml

name: DD XML diffs

on:
  pull_request:
    types: [opened, synchronize, reopened, edited]

permissions:
  pull-requests: write  # Required to comment on PRs
  issues: write         # Required for PR comments via issues API

jobs:
  build:
    name: Generate diff
    runs-on: ubuntu-24.04
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0  # checkout full repository
    - name: Install java and SaxonHE
      run: |
        sudo apt update
        sudo apt install -y libsaxonhe-java
    - name: Make (merged branch)
      run: |
        export CLASSPATH=/usr/share/java/Saxon-HE.jar
        make dd_data_dictionary.xml
        mkdir build
        mv dd_data_dictionary.xml build/merged.xml
    - name: Make (base branch)
      run: |
        git checkout ${{ github.base_ref }}
        export CLASSPATH=/usr/share/java/Saxon-HE.jar
        make dd_data_dictionary.xml
        mv dd_data_dictionary.xml build/base.xml
    - name: Text diff
      id: text_diff
      run: |
        cd build

        # Set up custom hunk headers for the diff
        echo "*.xml diff=ddxml" > .gitattributes
        git config --add diff.ddxml.xfuncname '(<(IDS|utilities).*)'

        # Generate line diff
        git diff --no-index -p base.xml merged.xml | tee diff.txt

        # Display line diff in step summary
        echo '### Changes in generated Data Dictionary XML file' >> $GITHUB_STEP_SUMMARY
        echo '```diff' >> $GITHUB_STEP_SUMMARY
        cat diff.txt >> $GITHUB_STEP_SUMMARY
        echo '```' >> $GITHUB_STEP_SUMMARY