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

fragment CommitsRef on Ref {
  target {
    ... on Commit {
      ...CommitsRefCommit
    }
  }
}

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