watchexec/.github/workflows/release-pr.yml

name: Open a release PR
on:
  workflow_dispatch:
    inputs:
      crate:
        description: Crate to release
        required: true
        type: choice
        options:
          - cli
          - lib
          - filterer-globset
          - filterer-ignore
          - filterer-tagged
          - ignore-files
          - project-origins
      version:
        description: Version to release
        required: true
        type: string

jobs:
  make-release-pr:
    runs-on: ubuntu-latest
    steps:
      - name: Install cargo-release
        uses: baptiste0928/cargo-install@v1
        with:
          crate: cargo-release
          version: "0.21"

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

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

          if [[ "${{ inputs.crate }}" == filterer-* ]]; then
            crate_path="crates/$(tr '-' '/' <<< "${{ inputs.crate }}")"
          else
            crate_path="crates/${{ inputs.crate }}"
          fi

          pushd "$crate_path"
          crate_name=$(head Cargo.toml -n2 | grep name | cut -d '"' -f2)
          popd

          branch_name="release-${{ inputs.crate }}-${{ inputs.version }}"

          echo "crate_name=${crate_name}" >> $GITHUB_ENV
          echo "crate_path=${crate_path}" >> $GITHUB_ENV
          echo "branch_name=${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 "${{ env.crate_path }}/release.toml" \
            --allow-branch "${{ env.branch_name }}" \
            --dependent-version upgrade \
            --package "${{ env.crate_name }}" \
            "${{ 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: ${{ inputs.crate }} v${{ inputs.version }}"
          body_intro="This is a release PR for **${{ inputs.crate }}** to version **${{ inputs.version }}**."
          if [[ "${{ inputs.crate }}" == "cli" ]]; then
            body_merge="Upon merging, this will automatically build the CLI and create a GitHub release. You still need to manually publish the cargo crate."
          else
            body_merge="Upon merging, you will still need to manually publish the cargo crate."
          fi

          body_outro="${fence}$ cd crates/${{ env.crate_path }}${nl}$ cargo publish${ecnef}${br}To merge this release, review the changes then say:${br}\`bors r+ p=10\`"

          body="${body_intro}${br}${body_merge}${br}${body_outro}"

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