schildi-web/.github/workflows/issue_closed.yml

# For duplicate issues, ensure the close type is right (not planned), update it if not
# For all closed (completed) issues, cascade the closure onto any referenced rageshakes
# For all closed (not planned) issues, comment on rageshakes to move them into the canonical issue if one exists
on:
  issues:
    types: [ closed ]
jobs:
  tidy:
    name: Tidy closed issues
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v6
        id: main
        with:
          # PAT needed as the GITHUB_TOKEN won't be able to see cross-references from other orgs (matrix-org)
          github-token: ${{ secrets.ELEMENT_BOT_TOKEN }}
          script: |
            const variables = {
              owner: context.repo.owner,
              name: context.repo.repo,
              number: context.issue.number,
            };

            const query = `query($owner:String!, $name:String!, $number:Int!) {
              repository(owner: $owner, name: $name) {
                issue(number: $number) {
                  stateReason,
                  timelineItems(first: 100, itemTypes: [MARKED_AS_DUPLICATE_EVENT, UNMARKED_AS_DUPLICATE_EVENT, CROSS_REFERENCED_EVENT]) {
                    edges {
                      node {
                        __typename
                        ... on MarkedAsDuplicateEvent {
                          canonical {
                            ... on Issue {
                              repository {
                                nameWithOwner
                              }
                              number
                            }
                            ... on PullRequest {
                              repository {
                                nameWithOwner
                              }
                              number
                            }
                          }
                        }
                        ... on UnmarkedAsDuplicateEvent {
                          canonical {
                            ... on Issue {
                              repository {
                                nameWithOwner
                              }
                              number
                            }
                            ... on PullRequest {
                              repository {
                                nameWithOwner
                              }
                              number
                            }
                          }
                        }
                        ... on CrossReferencedEvent {
                          source {
                            ... on Issue {
                              repository {
                                nameWithOwner
                              }
                              number
                            }
                            ... on PullRequest {
                              repository {
                                nameWithOwner
                              }
                              number
                            }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }`;

            const result = await github.graphql(query, variables);
            const { stateReason, timelineItems: { edges } } = result.repository.issue;

            const RAGESHAKE_OWNER = "matrix-org";
            const RAGESHAKE_REPO = "element-web-rageshakes";
            const rageshakes = new Set();
            const duplicateOf = new Set();

            console.log("Edges: ", JSON.stringify(edges));

            for (const { node } of edges) {
              switch(node.__typename) {
                case "MarkedAsDuplicateEvent":
                  duplicateOf.add(node.canonical.repository.nameWithOwner + "#" + node.canonical.number);
                  break;
                case "UnmarkedAsDuplicateEvent":
                  duplicateOf.remove(node.canonical.repository.nameWithOwner + "#" + node.canonical.number);
                  break;
                case "CrossReferencedEvent":
                  if (node.source.repository.nameWithOwner === (RAGESHAKE_OWNER + "/" + RAGESHAKE_REPO)) {
                    rageshakes.add(node.source.number);
                  }
                  break;
              }
            }

            console.log("Duplicate of: ", duplicateOf);
            console.log("Found rageshakes: ", rageshakes);

            if (duplicateOf.size) {
              const body = Array.from(duplicateOf).join("\n");

              // Comment on all rageshakes to create relationship to the issue this was closed as duplicate of
              for (const rageshake of rageshakes) {
                github.rest.issues.createComment({
                  owner: RAGESHAKE_OWNER,
                  repo: RAGESHAKE_REPO,
                  issue_number: rageshake,
                  body,
                });
              }

              // Duplicate was closed with wrong reason, fix it
              if (stateReason === "COMPLETED") {
                core.setOutput("closeAsNotPlanned", "true");
              }
            } else {
              // This issue was closed, close all related rageshakes
              for (const rageshake of rageshakes) {
                github.rest.issues.update({
                  owner: RAGESHAKE_OWNER,
                  repo: RAGESHAKE_REPO,
                  issue_number: rageshake,
                  state: "closed",
                });
              }
            }            
      - uses: actions/github-script@v6
        name: Close duplicate as Not Planned
        if: steps.main.outputs.closeAsNotPlanned
        with:
          # We do this step separately, and with the default token so as to not re-trigger this workflow when re-closing
          script: |
            await github.graphql(`mutation($id:ID!) {
              closeIssue(input: { issueId:$id, stateReason:NOT_PLANNED }) {
                clientMutationId
              }
            }`, {
              id: context.payload.issue.node_id,
            });