create-tag.yml

name: Create Tag

on:
  workflow_dispatch:
    inputs:
      version:
        description: "Version to tag (e.g. 0.10.0). Leave empty to auto-bump minor."
        required: false
        type: string

permissions:
  contents: write

jobs:
  create-tag:
    name: Create Tag
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Verify branch
        run: |
          if [ "${{ github.ref_name }}" != "main" ]; then
            echo "::error::Tags can only be created from main. Current branch: ${{ github.ref_name }}"
            exit 1
          fi

      - name: Determine version
        id: version
        run: |
          if [ -n "${{ inputs.version }}" ]; then
            VERSION="${{ inputs.version }}"
            # Strip leading 'v' if provided
            VERSION="${VERSION#v}"
          else
            # Get latest tag, strip 'v' prefix, bump minor
            LATEST=$(git tag --sort=-v:refname | head -1)
            LATEST="${LATEST#v}"
            MAJOR=$(echo "$LATEST" | cut -d. -f1)
            MINOR=$(echo "$LATEST" | cut -d. -f2)
            PATCH=$(echo "$LATEST" | cut -d. -f3)
            MINOR=$((MINOR + 1))
            VERSION="${MAJOR}.${MINOR}.0"
          fi

          TAG="v${VERSION}"

          if git rev-parse "$TAG" >/dev/null 2>&1; then
            echo "::error::Tag $TAG already exists"
            exit 1
          fi

          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"

      - name: Create and push tag
        run: |
          git tag "${{ steps.version.outputs.tag }}"
          git push origin "${{ steps.version.outputs.tag }}"

      - name: Summary
        run: echo "### Created tag \`${{ steps.version.outputs.tag }}\`" >> "$GITHUB_STEP_SUMMARY"