version-bump-check.yml

name: Version Bump Check

on:
  pull_request:

env:
  description: version update
  file: main.go
  regex: \s+packageVersion\s+=\s+"\S+"

jobs:
  main:
    runs-on: ubuntu-latest
    steps:
      - name: Check Out Code
        uses: actions/checkout@v4
        with:
          fetch-depth: -1

      - id: changes
        name: Check for Changes
        run: |
          changed_file="$(git diff ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }} ${{ env.file }})"

          if [ -z "$changed_file" ]; then
            exit 1
          else
            added_match=$(echo "$changed_file" | grep -E '^\+${{ env.regex }}' || true)
            removed_match=$(echo "$changed_file" | grep -E '^\-${{ env.regex }}' || true)

            if [[ -z "$added_match" ]] && [[ -z "$removed_match" ]]; then
              exit 1
            fi

            if [[ -n "$added_match" ]]; then
              echo "added_match=$added_match" >> $GITHUB_OUTPUT
            else
              echo "added_match=" >> $GITHUB_OUTPUT
            fi

            if [[ -n "$removed_match" ]]; then
              echo "removed_match=$removed_match" >> $GITHUB_OUTPUT
            else
              echo "removed_match=" >> $GITHUB_OUTPUT
            fi
          fi

      - if: success()
        name: Found Change Comment
        uses: thollander/actions-comment-pull-request@v2
        with:
          comment_tag: changes
          message: |
            :white_check_mark: Found ${{ env.description }} in `${{ env.file }}`:

            ```diff
            ${{ steps.changes.outputs.removed_match }}
            ${{ steps.changes.outputs.added_match }}
            ```

      - if: failure()
        name: Missing Change Comment
        uses: thollander/actions-comment-pull-request@v2
        with:
          comment_tag: changes
          message: |
            :warning: Could not find ${{ env.description }} in `${{ env.file }}`