.github/workflows/self-assign.yml

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name: Assign or close an issue
on: 
  issue_comment:
    types: [created]
jobs:
  assign:
    permissions:
      issues: write
    name: Take or close an issue
    if: ${{ !github.event.issue.pull_request }}
    runs-on: ubuntu-latest
    steps:
    - uses: actions/github-script@v9
      with:
        script: |
          const body = context.payload.comment.body.replace( /\r\n/g, " " ).replace( /\n/g, " " ).split(' ');
          console.log(body);
          for (let i = 0; i < body.length; i++) {
            const bodyString = body[i].toLowerCase();
            if (bodyString == '.take-issue') {
              console.log(`Assigning issue to ${context.payload.comment.user.login}`);
              github.rest.issues.addAssignees({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                assignees: [context.payload.comment.user.login]
              });
              try {
                await github.rest.issues.removeLabel({
                  issue_number: context.issue.number,
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  name: 'awaiting triage'
                });
              } catch (error) {
                console.log(`Failed to remove awaiting triage label. It may not exist on this issue. Error ${error.message}`);
              }
            } else if (bodyString == '.free-issue') {
              try {
                console.log(`Unassigning issue for ${context.payload.comment.user.login}`);
                github.rest.issues.removeAssignees({
                  issue_number: context.issue.number,
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  assignees: [context.payload.comment.user.login]
                });
              } catch (error) {
                console.log(`Failed to remove ${context.payload.comment.user.login} from issue. It may not exist on this issue. Error ${error}`);
              }
            } else if (bodyString == '.close-issue') {
              console.log('Closing issue');
              if (i + 1 < body.length && body[i+1].toLowerCase() == 'not_planned') {
                github.rest.issues.update({
                  issue_number: context.issue.number,
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  state: 'closed',
                  state_reason: 'not_planned'
                });
              } else {
                github.rest.issues.update({
                  issue_number: context.issue.number,
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  state: 'closed'
                });
              }
            } else if (bodyString == '.reopen-issue') {
                console.log('Reopening issue');
                github.rest.issues.update({
                  issue_number: context.issue.number,
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  state: 'open'
                });
            } else if (bodyString == '.set-labels' || bodyString == '.add-labels' || bodyString == '.remove-labels') {
              console.log('Updating labels');
              if (i + 1 >= body.length) {
                console.log(`Invalid input ${body}`);
                github.rest.issues.createComment({
                  issue_number: context.issue.number,
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  body: '.<update>-labels command detected, but no labels provided.'
                });
                return;
              } else {
                const labelsInRepo = (await github.paginate(github.rest.issues.listLabelsForRepo, {
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                })).map(l => l.name);
                let j = i+1;
                let partsToConsider = body[j];
                while ((partsToConsider.match(/'/g) || []).length % 2 == 1) {
                  j++;
                  if (j >= body.length) {
                    console.log(`Invalid input ${body}`);
                    github.rest.issues.createComment({
                      issue_number: context.issue.number,
                      owner: context.repo.owner,
                      repo: context.repo.repo,
                      body: '.<update>-labels command detected with mismatched set of \' quotes'
                    });
                    return;
                  }
                  partsToConsider += ' ' + body[j];
                }
                const labelsToActionOn = partsToConsider.split(',').map(l => l.replaceAll('\'', ''));
                for (label of labelsToActionOn) {
                  if (labelsInRepo.indexOf(label) < 0) {
                    console.log(`Invalid label ${body}`);
                    github.rest.issues.createComment({
                      issue_number: context.issue.number,
                      owner: context.repo.owner,
                      repo: context.repo.repo,
                      body: `Label ${label} cannot be managed because it does not exist in the repo. Please check your spelling.`
                    });
                    return;
                  }
                }
                
                if (bodyString == '.set-labels') {
                  console.log(`Setting labels to ${labelsToActionOn}`);
                  github.rest.issues.setLabels({
                    issue_number: context.issue.number,
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    labels: labelsToActionOn
                  });
                } else if (bodyString == '.add-labels') {
                  console.log(`Adding labels ${labelsToActionOn}`);
                  github.rest.issues.addLabels({
                    issue_number: context.issue.number,
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    labels: labelsToActionOn
                  });
                } else if (bodyString == '.remove-labels') {
                  console.log(`Removing labels ${labelsToActionOn}`);
                  // There's no true removeLabels command, we'll remove them one by one
                  for (const label of labelsToActionOn) {
                    github.rest.issues.removeLabel({
                      issue_number: context.issue.number,
                      owner: context.repo.owner,
                      repo: context.repo.repo,
                      name: label
                    });
                  }
                }
              }
            }
          }