fragment T on Ref {
  target {
    __typename
    ... on Commit {
      oid
      url
      messageHeadline
      committedDate
      author {
        name
        avatarUrl
        user {
          login
        }
      }
      status {
        state
      }
      history(first: 30, after: $after) {
        pageInfo {
          hasNextPage
          endCursor
        }
        nodes {
          oid
          url
          messageHeadline
          committedDate
          author {
            name
            avatarUrl
            user {
              login
            }
          }
          status {
            state
          }
        }
      }
    }
  }
}

query GhCommits(
  $owner: String!
  $name: String!
  $ref: String!
  $hasRef: Boolean!
  $after: String
) {
  repository(owner: $owner, name: $name) {
    defaultBranchRef @skip(if: $hasRef) {
      ...T
    }
    ref(qualifiedName: $ref) @include(if: $hasRef) {
      ...T
    }
  }
}