auto-publish.yml

name:
  Auto Publish

  # Ensure version in Cargo.toml is bumped before merging to master

on:
  push:
    branches:
      - master
    paths:
      - "Cargo.toml"
      - "src/**"
      - "README.md"
      - "LICENSE"

env:
  CARGO_TERM_COLOR: always

jobs:
  check-version:
    name: Check if version changed
    runs-on: ubuntu-latest
    outputs:
      version_changed: ${{ steps.check.outputs.changed }}
      new_version: ${{ steps.check.outputs.version }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 2

      - name: Check if version changed
        id: check
        run: |
          CURRENT_VERSION=$(grep '^version' Cargo.toml | head -1 | sed 's/version = "\(.*\)"/\1/')
          echo "version=$CURRENT_VERSION" >> $GITHUB_OUTPUT

          git diff HEAD^ HEAD -- Cargo.toml | grep -q '^+version' && echo "changed=true" >> $GITHUB_OUTPUT || echo "changed=false" >> $GITHUB_OUTPUT

  publish:
    name: Publish to crates.io
    needs: check-version
    if: needs.check-version.outputs.version_changed == 'true'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install Rust
        uses: dtolnay/rust-toolchain@stable

      - name: Cache cargo registry
        uses: actions/cache@v4
        with:
          path: ~/.cargo/registry
          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}

      - name: Cache cargo index
        uses: actions/cache@v4
        with:
          path: ~/.cargo/git
          key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}

      - name: Run tests
        run: cargo test --all-features --verbose

      - name: Run clippy
        run: cargo clippy --all-features -- -D warnings

      - name: Check documentation
        run: cargo doc --all-features --no-deps
        env:
          RUSTDOCFLAGS: -D warnings

      - name: Dry run publish
        run: cargo publish --dry-run --allow-dirty

      - name: Publish to crates.io
        run: cargo publish --token ${{ secrets.CARGO_REGISTRY_TOKEN }}
        env:
          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

      - name: Create git tag
        run: |
          VERSION=${{ needs.check-version.outputs.new_version }}
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git tag -a "v$VERSION" -m "Release v$VERSION"
          git push origin "v$VERSION"