combine-prs.yml

name: "Combine PRs"

# Controls when the action will run - in this case triggered manually
on:
  workflow_dispatch:
    inputs:
      branchPrefix:
        description: "Branch prefix to find combinable PRs based on"
        required: true
        default: "dependabot"
      mustBeGreen:
        description: "Only combine PRs that are green (status is success)"
        required: true
        default: "true"
      combineBranchName:
        description: "Name of the branch to combine PRs into"
        required: true
        default: "combine-prs-branch"
      ignoreLabel:
        description: "Exclude PRs with this label"
        required: true
        default: "nocombine"

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "combine-prs"
  combine-prs:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      - uses: actions/github-script@v6
        id: create-combined-pr
        name: Create Combined PR
        with:
          github-token: ${{secrets.TEXTILEIO_MACHINE_ACCESS_TOKEN}}
          script: |
            const pulls = await github.paginate('GET /repos/:owner/:repo/pulls', {
              owner: context.repo.owner,
              repo: context.repo.repo
            });
            let branchesAndPRStrings = [];
            let baseBranch = null;
            let baseBranchSHA = null;
            for (const pull of pulls) {
              const branch = pull['head']['ref'];
              console.log('Pull for branch: ' + branch);
              if (branch.startsWith('${{ github.event.inputs.branchPrefix }}')) {
                console.log('Branch matched prefix: ' + branch);
                let statusOK = true;
                if(${{ github.event.inputs.mustBeGreen }}) {
                  console.log('Checking green status: ' + branch);

                  const checkRuns = await github.request('GET /repos/{owner}/{repo}/commits/{ref}/check-runs', {
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    ref: branch
                  });
                  for await (const cr of checkRuns.data.check_runs) {
                    console.log('Validating check conclusion: ' + cr.conclusion);
                    if(cr.conclusion != 'success') {
                      console.log('Discarding ' + branch + ' with check conclusion ' + cr.conclusion);
                      statusOK = false;
                    }
                  }
                }
                console.log('Checking labels: ' + branch);
                const labels = pull['labels'];
                for(const label of labels) {
                  const labelName = label['name'];
                  console.log('Checking label: ' + labelName);
                  if(labelName == '${{ github.event.inputs.ignoreLabel }}') {
                    console.log('Discarding ' + branch + ' with label ' + labelName);
                    statusOK = false;
                  }
                }
                if (statusOK) {
                  console.log('Adding branch to array: ' + branch);
                  const prString = '#' + pull['number'] + ' ' + pull['title'];
                  branchesAndPRStrings.push({ branch, prString });
                  baseBranch = pull['base']['ref'];
                  baseBranchSHA = pull['base']['sha'];
                }
              }
            }
            if (branchesAndPRStrings.length == 0) {
              core.setFailed('No PRs/branches matched criteria');
              return;
            }
            try {
              await github.rest.git.createRef({
                owner: context.repo.owner,
                repo: context.repo.repo,
                ref: 'refs/heads/' + '${{ github.event.inputs.combineBranchName }}',
                sha: baseBranchSHA
              });
            } catch (error) {
              console.log(error);
              core.setFailed('Failed to create combined branch - maybe a branch by that name already exists?');
              return;
            }

            let combinedPRs = [];
            let mergeFailedPRs = [];
            for(const { branch, prString } of branchesAndPRStrings) {
              try {
                await github.rest.repos.merge({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  base: '${{ github.event.inputs.combineBranchName }}',
                  head: branch,
                });
                console.log('Merged branch ' + branch);
                combinedPRs.push(prString);
              } catch (error) {
                console.log('Failed to merge branch ' + branch);
                mergeFailedPRs.push(prString);
              }
            }

            console.log('Creating combined PR');
            const combinedPRsString = combinedPRs.join('\n');
            let body = '✅ This PR was created by the Combine PRs action by combining the following PRs:\n' + combinedPRsString;
            if(mergeFailedPRs.length > 0) {
              const mergeFailedPRsString = mergeFailedPRs.join('\n');
              body += '\n\n⚠️ The following PRs were left out due to merge conflicts:\n' + mergeFailedPRsString
            }
            await github.rest.pulls.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title: 'Combined PR',
              head: '${{ github.event.inputs.combineBranchName }}',
              base: baseBranch,
              body: body
            });