codex-version-check.yml

name: Codex Version Check

on:
  pull_request:
    paths:
      - 'plugins/ralph-specum-codex/**'

jobs:
  check-version-bump:
    name: Verify Codex package version bump
    runs-on: ubuntu-latest
    steps:
      - name: Checkout PR branch
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check Codex manifest version
        run: |
          BASE_BRANCH="${{ github.base_ref }}"
          MANIFEST="plugins/ralph-specum-codex/.codex-plugin/plugin.json"

          version_greater() {
            local v1=$1 v2=$2
            if [ "$v1" = "$v2" ]; then
              return 1
            fi
            local IFS=.
            local i v1_parts=($v1) v2_parts=($v2)
            for ((i=0; i<${#v1_parts[@]} || i<${#v2_parts[@]}; i++)); do
              local n1=${v1_parts[i]:-0}
              local n2=${v2_parts[i]:-0}
              if ((n1 > n2)); then
                return 0
              fi
              if ((n1 < n2)); then
                return 1
              fi
            done
            return 1
          }

          validate_semver() {
            local version=$1
            [[ "$version" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]
          }

          if [ ! -f "$MANIFEST" ]; then
            echo "ERROR: Missing Codex manifest at $MANIFEST"
            exit 1
          fi

          if ! git diff --quiet "origin/${BASE_BRANCH}...HEAD" -- plugins/ralph-specum-codex/; then
            echo "Detected changes under plugins/ralph-specum-codex/"
          else
            echo "No Codex package changes detected"
            exit 0
          fi

          PR_VERSION=$(jq -r '.version // "null"' "$MANIFEST" 2>/dev/null || echo "null")
          PR_NAME=$(jq -r '.name // "null"' "$MANIFEST" 2>/dev/null || echo "null")
          BASE_VERSION=$(git show "origin/${BASE_BRANCH}:${MANIFEST}" 2>/dev/null | jq -r '.version // "null"' 2>/dev/null || echo "null")

          echo "manifest name:    $PR_NAME"
          echo "manifest version: ${BASE_VERSION} -> ${PR_VERSION}"

          if [ "$PR_NAME" != "ralph-specum-codex" ]; then
            echo "ERROR: Expected manifest name ralph-specum-codex"
            exit 1
          fi

          if [ "$PR_VERSION" = "null" ] || [ -z "$PR_VERSION" ]; then
            echo "ERROR: Missing version in $MANIFEST"
            exit 1
          fi

          if ! validate_semver "$PR_VERSION"; then
            echo "ERROR: Invalid semantic version in $MANIFEST: $PR_VERSION"
            exit 1
          fi

          if [ "$BASE_VERSION" = "null" ] || [ -z "$BASE_VERSION" ]; then
            echo "New Codex manifest detected. Version: $PR_VERSION"
            exit 0
          fi

          if ! validate_semver "$BASE_VERSION"; then
            echo "ERROR: Base branch has invalid semantic version in $MANIFEST: $BASE_VERSION"
            exit 1
          fi

          if [ "$PR_VERSION" = "$BASE_VERSION" ]; then
            echo "ERROR: Codex package changed but version was not bumped"
            exit 1
          fi

          if ! version_greater "$PR_VERSION" "$BASE_VERSION"; then
            echo "ERROR: Codex package version must increase"
            exit 1
          fi

          echo "Codex package version check passed"