name: Continuous Deployment

on:
  workflow_dispatch:
  schedule:
    # At 00:00 on Saturday
    # https://crontab.guru/#0_0_*_*_6
    - cron: "0 0 * * 6"
  push:
    tags:
      - "v*.*.*"

defaults:
  run:
    shell: bash

jobs:
  publish-alpha:
    name: Create an alpha release
    runs-on: ubuntu-latest
    permissions:
      contents: write
    if: ${{ !startsWith(github.event.ref, 'refs/tags/v') }}
    steps:
      - name: Checkout the repository
        uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Calculate the next release
        run: |
          suffix="alpha"
          last_tag="$(git describe --abbrev=0 --tags `git rev-list --tags --max-count=1`)"
          if [[ "${last_tag}" = *"-${suffix}"* ]]; then
            # increment the alpha version
            # e.g. v0.22.1-alpha.12 -> v0.22.1-alpha.13
            alpha="${last_tag##*-${suffix}.}"
            next_alpha="$((alpha + 1))"
            next_tag="${last_tag/%${alpha}/${next_alpha}}"
          else
            # increment the patch and start the alpha version from 0
            # e.g. v0.22.0 -> v0.22.1-alpha.0
            patch="${last_tag##*.}"
            next_patch="$((patch + 1))"
            next_tag="${last_tag/%${patch}/${next_patch}}-${suffix}.0"
          fi
          # update the crate version
          msg="# crate version"
          sed -E -i "s/^version = .* ${msg}$/version = \"${next_tag#v}\" ${msg}/" Cargo.toml
          echo "NEXT_TAG=${next_tag}" >> $GITHUB_ENV
          echo "Next alpha release: ${next_tag} 🐭"

      - name: Publish on crates.io
        uses: actions-rs/cargo@v1
        with:
          command: publish
          args: --allow-dirty --token ${{ secrets.CARGO_TOKEN }}

      - name: Generate a changelog
        uses: orhun/git-cliff-action@v2
        with:
          config: cliff.toml
          args: --unreleased --tag ${{ env.NEXT_TAG }} --strip header
        env:
          OUTPUT: BODY.md

      - name: Publish on GitHub
        uses: ncipollo/release-action@v1
        with:
          tag: ${{ env.NEXT_TAG }}
          prerelease: true
          bodyFile: BODY.md

  publish-stable:
    name: Create a stable release
    runs-on: ubuntu-latest
    if: ${{ startsWith(github.event.ref, 'refs/tags/v') }}
    steps:
      - name: Checkout the repository
        uses: actions/checkout@v3

      - name: Publish on crates.io
        uses: actions-rs/cargo@v1
        with:
          command: publish
          args: --token ${{ secrets.CARGO_TOKEN }}