libtemplate-update.yml

name: Library.Template update

# PREREQUISITE: This workflow requires the repo to be configured to allow workflows to push commits and create pull requests.
# Visit https://github.com/USER/REPO/settings/actions
# Under "Workflow permissions", select "Read and write permissions" and check "Allow GitHub Actions to create ...pull requests"
# Click Save.

on:
  schedule:
  - cron: "0 3 * * Mon" # Sun @ 8 or 9 PM Mountain Time (depending on DST)
  workflow_dispatch:

jobs:
  merge:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
      with:
        fetch-depth: 0 # avoid shallow clone so nbgv can do its work.

    - name: merge
      shell: pwsh
      run: |
        $LibTemplateBranch = & ./azure-pipelines/Get-LibTemplateBasis.ps1 -ErrorIfNotRelated
        if ($LASTEXITCODE -ne 0) {
          exit $LASTEXITCODE
        }

        git fetch https://github.com/aarnott/Library.Template $LibTemplateBranch
        if ($LASTEXITCODE -ne 0) {
          exit $LASTEXITCODE
        }
        $LibTemplateCommit = git rev-parse FETCH_HEAD

        if ((git rev-list FETCH_HEAD ^HEAD --count) -eq 0) {
          Write-Host "There are no Library.Template updates to merge."
          exit 0
        }

        git -c http.extraheader="AUTHORIZATION: bearer $env:GH_TOKEN" push origin -u FETCH_HEAD:refs/heads/auto/libtemplateUpdate
    - name: pull request
      shell: pwsh
      run: |
        # If there is already an active pull request, don't create a new one.
        $existingPR = gh pr list -H auto/libtemplateUpdate --json url | ConvertFrom-Json
        if ($existingPR) {
          Write-Host "::warning::Skipping pull request creation because one already exists at $($existingPR[0].url)"
          exit 0
        }

        $prTitle = "Merge latest Library.Template"
        $prBody = "This merges the latest features and fixes from [Library.Template's  branch](https://github.com/AArnott/Library.Template/tree/).

        <details>
        <summary>Merge conflicts?</summary>
        Resolve merge conflicts locally by carrying out these steps:

        ```
        git fetch
        git checkout auto/libtemplateUpdate
        git merge origin/main
        # resolve conflicts
        git commit
        git push
        ```
        </details>

        ⚠️ Do **not** squash this pull request when completing it. You must *merge* it."

        gh pr create -H auto/libtemplateUpdate -b $prBody -t $prTitle
      env:
        GH_TOKEN: ${{ github.token }}