action.yml

name: Release GitHub Action
description: Bumps version, creates semver tags (vX.Y.Z, vX.Y, vX), and publishes a GitHub Release

inputs:
  github-token:
    description: Token for the GitHub API (`secrets.GITHUB_TOKEN`)
    required: true

runs:
  using: composite
  steps:
    - name: Read version and compute tags
      id: version
      shell: bash
      run: |
        VERSION=$(jq -r '.version' package.json)

        if [[ ! "$VERSION" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
          echo "::error::Invalid semver in package.json: '${VERSION}'"
          exit 1
        fi

        IFS='.' read -r MAJOR MINOR PATCH <<< "$VERSION"

        echo "version=v${VERSION}" >> "$GITHUB_OUTPUT"
        echo "minor=v${MAJOR}.${MINOR}" >> "$GITHUB_OUTPUT"
        echo "major=v${MAJOR}" >> "$GITHUB_OUTPUT"

    - name: Check if tag already exists
      id: check
      shell: bash
      env:
        GH_TOKEN: ${{ inputs.github-token }}
      run: |
        if gh api "repos/${{ github.repository }}/git/ref/tags/${{ steps.version.outputs.version }}" &>/dev/null; then
          echo "exists=true" >> "$GITHUB_OUTPUT"
          echo "::notice::Tag ${{ steps.version.outputs.version }} already exists, skipping."
        else
          echo "exists=false" >> "$GITHUB_OUTPUT"
        fi

    - name: Create tags and release
      if: steps.check.outputs.exists == 'false'
      shell: bash
      env:
        GH_TOKEN: ${{ inputs.github-token }}
      run: |
        VERSION="${{ steps.version.outputs.version }}"
        MINOR="${{ steps.version.outputs.minor }}"
        MAJOR="${{ steps.version.outputs.major }}"
        REPO="${{ github.repository }}"
        SHA="$(git rev-parse HEAD)"

        gh api -X POST "repos/${REPO}/git/refs" \
          -f ref="refs/tags/${VERSION}" -f sha="${SHA}"

        # Upsert floating tags (vX.Y, vX)
        for TAG in "$MINOR" "$MAJOR"; do
          gh api -X PATCH "repos/${REPO}/git/refs/tags/${TAG}" \
            -f sha="${SHA}" -F force=true 2>/dev/null \
          || gh api -X POST "repos/${REPO}/git/refs" \
            -f ref="refs/tags/${TAG}" -f sha="${SHA}"
        done

        gh release create "${VERSION}" --title "${VERSION}" --generate-notes --latest