on-pr-label.yml

# Workflow Name: On PR label
#
# Owner: Digdir Platform team / Digdir development teams
#
# Purpose:
#   This workflow is responsible for appending an internal commit string to the
#   title of a pull request when the 'internal' label is added. This could be
#   expanded in the future to include other actions based on different labels,
#   but for now it serves the specific purpose of marking PRs as internal by
#   appending a predefined string to the PR title. PRs updated using this
#   workflow will be ignored when generating public release notes.
#
#   Flow:
#     1. When a label is added to a PR, check if the label is 'internal'
#     2. If the label is 'internal', append the internal commit string to the PR
#        title if it is not already present
#
# Trigger:
#   Triggered by workflow calls (workflow_call)
#
# Inputs:
#   None
#
# Outputs:
#   None
#

name: On PR label

permissions: {}

on:
  workflow_call:

env:
  INTERNAL_COMMIT_STRING: "(INTERNAL-COMMIT)"

jobs:
  append-internal-commit-string-to-title:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    if: github.event.label.name == 'internal'
    steps:
      - name: Append ${{ env.INTERNAL_COMMIT_STRING }} to PR title
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # pin@v9.0.0
        with:
          github-token: ${{ github.token }}
          script: |
            const { pull_request } = context.payload;
            const commitString = process.env.INTERNAL_COMMIT_STRING;
            const newTitle = `${pull_request.title} ${commitString}`;

            if (!pull_request.title.includes(commitString)) {
              const response = await github.rest.pulls.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: pull_request.number,
                title: newTitle,
              });
              core.info(`PR title updated to ${response.data.title}`);
            } else {
              core.info(`PR title already contains ${commitString}`);
            }