# SPDX-License-Identifier: MIT
name: 'Cascading PR'
author: 'Forgejo authors'
description: |

  When used in a workflow triggered by a PR event, it will create,
  update and close a matching PR in another repository. Whenever the
  matching PR is modified by `cascading-pr`, it waits for the CI to
  pass otherwise it fails.

  As an example, when a PR is created in
  [`forgejo/runner`](https://code.forgejo.org/forgejo/runner/), a
  matching PR is created in
  [`actions/setup-forgejo`](https://code.forgejo.org/actions/setup-forgejo/)
  with the proposed change. `cascading-pr` will wait until the CI in
  `actions/setup-forgejo` is successful. When the PR in
  `forgejo/runner` is merged, the matching PR in
  `actions/setup-forgejo` is updated to use what was just merged and
  is ready to be reviewed.

  The `update` script is expected to be found in the origin repository
  running the PR. It is given four arguments:

    * A directory in which the destination repository (or a fork) is checked-out
      on the base branch
    * A file with the JSON describing the pull request in the
      destination repository
    * A directory in which the origin repository is checked-out
      on the head branch
    * A file with the JSON describing the pull request in the
      origin repository

  If changes are found in the destination repository directory after the `update` script runs,
  they will be pushed as a new commit in the PR.

  When the PR is from a forked repository, the `update` script is checked out from
  the default branch instead of the head branch of the fork.

  If the fork of the destination repository is specified and it does
  not exist, it is created.

inputs:
  origin-url:
    description: 'URL of the Forgejo instance where the PR that triggers the action is located (e.g. https://code.forgejo.org)'
    required: true
  origin-repo:
    description: 'the repository in which the PR was created'
    required: true
  origin-token:
    description: 'a token with write permission on origin-repo'
    required: true
  origin-pr:
    description: 'number of the PR in {orign-repo}'
    required: true
  destination-url:
    description: 'URL of the Forgejo instance where the cascading PR is created or updated (e.g. https://code.forgejo.org)'
    required: true
  destination-repo:
    description: 'the repository in which the cascading PR is created or updated'
    required: true
  destination-fork-repo:
    description: 'the fork of {desitnation-repo} in which the {destination-branch} will be created or updated'
  destination-branch:
    description: 'the base branch of the destination repository for the cascading PR'
    required: true
  destination-token:
    description: 'a token with write permission on destination-repo'
    required: true
  update:
    description: 'path to the script to update the content of the cascading PR'
    required: true
  prefix:
    description: 'prefix of the cascading PR created on destination-repo (default to {origin-repo})'
  close-merge:
    description: 'if true the cascading PR will be closed and the branch deleted when the PR is merged'
    default: false
  verbose:
    description: 'if true print verbose information'
    default: false
  debug:
    description: 'if true print debug information'
    default: false

runs:
  using: "composite"
  steps:
    - uses: actions/checkout@v4
    - run: |
        export PATH=${{ github.action_path }}:$PATH

        if "${{ inputs.verbose }}"; then
          verbosity="$verbosity --verbose"
        fi
        if "${{ inputs.debug }}"; then
          verbosity="$verbosity --debug"
        fi

        origin_token=$(pwd)/origin.token
        echo -n ${{ inputs.origin-token }} > $origin_token
        destination_token=$(pwd)/destination.token
        echo -n ${{ inputs.destination-token }} > $destination_token

        cascading-pr.sh $verbosity \
                        --origin-url "${{ inputs.origin-url }}" \
                        --origin-repo "${{ inputs.origin-repo }}" \
                        --origin-token "@$origin_token" \
                        --origin-pr "${{ inputs.origin-pr }}" \
                        --destination-url "${{ inputs.destination-url }}" \
                        --destination-repo "${{ inputs.destination-repo }}" \
                        --destination-fork-repo "${{ inputs.destination-fork-repo }}" \
                        --destination-token "@$destination_token" \
                        --destination-branch "${{ inputs.destination-branch }}" \
                        --update "${{ inputs.update }}" \
                        --prefix "${{ inputs.prefix }}" \
                        --close-merge "${{ inputs.close-merge }}" \
                        run