release.yml

name: Release

on:
  push:
    branches: [main]
  workflow_dispatch:

permissions:
  contents: write

env:
  CARGO_TERM_COLOR: always

jobs:
  release:
    name: Tag, changelog & WASM artifacts
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Install Rust toolchain
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: stable
          targets: wasm32v1-none

      - name: Cache Cargo dependencies
        uses: Swatinem/rust-cache@v2
        with:
          key: release-wasm

      - name: Compute next semver tag
        id: version
        run: |
          set -euo pipefail
          last_tag=$(git describe --tags --abbrev=0 --match 'v*' 2>/dev/null || true)
          if [[ -z "${last_tag}" ]]; then
            next_tag="v0.1.0"
            prev_tag=""
          else
            prev_tag="${last_tag}"
            IFS='.' read -r major minor patch <<< "${last_tag#v}"
            if [[ -z "${major:-}" || -z "${minor:-}" || -z "${patch:-}" ]]; then
              next_tag="v$(date +%Y%m%d).0"
            else
              next_tag="v${major}.${minor}.$((patch + 1))"
            fi
          fi
          if git rev-parse -q --verify "refs/tags/${next_tag}" >/dev/null; then
            next_tag="v$(date +%Y%m%d).0"
          fi
          echo "tag=${next_tag}" >> "$GITHUB_OUTPUT"
          echo "prev=${prev_tag}" >> "$GITHUB_OUTPUT"

      - name: Generate changelog
        id: changelog
        run: |
          set -euo pipefail
          prev="${{ steps.version.outputs.prev }}"
          if [[ -n "${prev}" ]]; then
            range="${prev}..HEAD"
          else
            range="HEAD"
          fi
          {
            echo "notes<<CHANGELOG_EOF"
            echo "## What's Changed"
            echo ""
            git log --no-merges --pretty='- %s (%h)' "${range}" || true
            echo ""
            echo "**Full Changelog**: https://github.com/${{ github.repository }}/compare/${prev}...${{ steps.version.outputs.tag }}"
            echo "CHANGELOG_EOF"
          } >> "$GITHUB_OUTPUT"

      - name: Build and package WASM
        run: |
          set -euo pipefail
          bash scripts/package-wasm.sh dist

      - name: Create GitHub release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ steps.version.outputs.tag }}
          name: ${{ steps.version.outputs.tag }}
          body: ${{ steps.changelog.outputs.notes }}
          files: |
            dist/*.wasm
            dist/checksums.txt
          fail_on_unmatched_files: true