release.yml

name: Release

on:
  push:
    branches:
      - main
    paths-ignore:
      - VERSION
      - CHANGELOG.md
  workflow_dispatch:
    inputs:
      bump:
        description: "Version bump type"
        required: true
        default: patch
        type: choice
        options:
          - patch
          - minor
          - major

permissions:
  contents: write

jobs:
  release:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Configure git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

      - name: Bump version
        id: bump
        shell: bash
        run: |
          set -euo pipefail

          bump_type="$(jq -r '.inputs.bump // "patch"' "$GITHUB_EVENT_PATH")"

          current="$(cat VERSION 2>/dev/null || echo "0.1.0")"
          IFS='.' read -r major minor patch <<< "$current"

          case "$bump_type" in
            major)
              major=$((major + 1))
              minor=0
              patch=0
              ;;
            minor)
              minor=$((minor + 1))
              patch=0
              ;;
            patch)
              patch=$((patch + 1))
              ;;
            *)
              echo "Invalid bump type" >&2
              exit 1
              ;;
          esac

          next="$major.$minor.$patch"
          tag="v$next"

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

      - name: Update changelog
        shell: bash
        run: |
          set -euo pipefail

          today="$(date +%F)"
          version="${{ steps.bump.outputs.version }}"
          tag="${{ steps.bump.outputs.tag }}"

          if [ ! -f CHANGELOG.md ]; then
            printf '# Changelog\n\nAll notable changes to this project will be documented in this file.\n' > CHANGELOG.md
          fi

          tmpfile="$(mktemp)"
          {
            echo "# Changelog"
            echo
            echo "All notable changes to this project will be documented in this file."
            echo
            echo "## [$tag] - $today"
            echo "### Changed"
            echo "- Release $tag"
            echo
            sed '1,4d' CHANGELOG.md || true
          } > "$tmpfile"

          mv "$tmpfile" CHANGELOG.md

      - name: Commit and push
        shell: bash
        run: |
          set -euo pipefail

          git add VERSION CHANGELOG.md

          if git diff --cached --quiet; then
            echo "No version changes to commit"
            exit 0
          fi

          git commit -m "release: ${{ steps.bump.outputs.tag }}"
          git push origin "HEAD:${GITHUB_REF_NAME}"

      - name: Create and push tag
        shell: bash
        run: |
          set -euo pipefail

          tag="${{ steps.bump.outputs.tag }}"

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

          git tag -a "$tag" -m "Release $tag"
          git push origin "$tag"

      - name: Publish GitHub release
        shell: bash
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail

          tag="${{ steps.bump.outputs.tag }}"

          if gh release view "$tag" >/dev/null 2>&1; then
            echo "Release $tag already exists"
            exit 0
          fi

          gh release create "$tag" \
            --title "Release $tag" \
            --generate-notes