name: Open a release PR
on:
  workflow_dispatch:
    inputs:
      version:
        description: Version to release
        required: true
        type: string

jobs:
  make-release-pr:
    runs-on: ubuntu-latest
    steps:
      - name: Install cargo-release
        uses: taiki-e/install-action@v1
        with:
          tool: cargo-release

      - uses: actions/checkout@v2
        with:
          ref: main

      - name: Extract info
        run: |
          set -euxo pipefail

          branch_name="release-${{ inputs.version }}"
          echo "branch_name=${branch_name}" >> $GITHUB_ENV

      - name: Make release branch
        run: git switch -c "${{ env.branch_name }}"

      - name: Do release
        run: |
          set -euxo pipefail
          git config user.name github-actions
          git config user.email github-actions@github.com
          cargo release \
            --execute \
            --no-push \
            --no-tag \
            --no-publish \
            --no-confirm \
            --verbose \
            --config release.toml \
            --allow-branch "${{ env.branch_name }}" \
            --dependent-version upgrade \
            "${{ inputs.version }}"

      - name: Push new branch
        run: |
          set -euxo pipefail
          git push origin "${{ env.branch_name }}"

      - name: Create PR
        run: |
          set -euxo pipefail

          nl=$'\n'
          br=$'\n\n'
          fence=$'```\n'
          ecnef=$'\n```'

          title="release: v${{ inputs.version }}"
          body_intro="This is a release PR for version **${{ inputs.version }}**."
          body_merge="**Use squash merge.** Upon merging, this will automatically build the CLI and create a GitHub release. You still need to manually publish the cargo crate."
          body_pub="${fence}$ cd ${{ env.crate_path }}${nl}$ cargo publish${ecnef}"
          body_notes="---${br}_Edit release notes into the section below:_${br}<!-- do not change or remove this heading -->${nl}### Release notes"

          body="${body_intro}${br}${body_merge}${br}${body_pub}${br}${body_notes}${br}"

          gh pr create --title "$title" --body "$body" --base main --head "${{ env.branch_name }}" --label "release"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}