master-pr-version-check.yml

name: "Check for version update in PR to Master"

on:
  pull_request:
    # Sequence of patterns matched against refs/heads
    branches:    
    - master

jobs:
  master-pr-check-version:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v1
    - name: Check if version changed
      run: |
        check_versions() {
          git diff origin/master package.json | grep version
        }
        version_changed=`check_versions | wc -l | tr -d '[:space:]'`
        if [ $version_changed -gt 1 ]; then
          echo "Versions are different; verifying that the version increased"
          check_versions
          version_increased=`check_versions | awk -F\" '{
            split($4, old, ".");
            getline;
            split($4, new, ".");
            if(new[1] > old[1] \
              || (new[1] == old[1] && new[2] > old[2]) \
              || (new[1] == old[1] && new[2] == old[2] && new[3] > old[3])) {
              print 1
            } else {
              print 0
            }
          }'`
          if [ $version_increased -eq 1 ]; then
            echo "Version is properly increased!"
            exit 0
          else
            echo "Version is not properly increased; failing..."
            exit 1
          fi
        else
          echo "Version has not been modified; failing..."
          exit 1
        fi