int commit_interleaver::interleave()

in src/commit_interleaver.h [641:708]
61 lines of code
11 McCabe index (conditional complexity)

int commit_interleaver::interleave() {
  // Persistent buffers.
  std::vector<MergeTarget> targets;
  std::vector<sha1_ref> new_parents;
  std::vector<int> parent_revs;
  std::vector<git_tree::item_type> items;
  git_cache::commit_tree_buffers buffers;

  // Construct trees and commit them.
  progress_reporter progress(q);
  progress.report();
  while (!q.fparents.empty()) {
    auto fparent = q.fparents.back();
    q.fparents.pop_back();
    auto &source = q.sources[fparent.index];
    if (fparent.is_translated) {
      MergeRequest merge(targets, new_parents, parent_revs, items, buffers);
      sha1_ref base, mono;
      if (source.is_repeat) {
        mono = fparent.commit;
      } else {
        base = fparent.commit;
        if (cache.compute_mono(fparent.commit, mono))
          return error("expected '" + fparent.commit->to_string() +
                       "' to be translated already");
      }

      targets.emplace_back(source, base, mono);
      sha1_ref new_commit;
      if (merge_targets(merge, new_commit))
        return error("failed to generate merge of '" +
                     fparent.commit->to_string() + "'");
      set_source_head(source, fparent.commit);
      head = new_commit;
      progress.report_merge();
      continue;
    }

    assert(!source.is_repeat);
    if (!source.commits.count)
      return error("need to translate '" + fparent.commit->to_string() +
                   "' but out of commits");
    auto untranslated_first = q.commits.begin() + source.commits.first,
         untranslated_last = untranslated_first + source.commits.count;
    while (untranslated_first->commit != fparent.commit) {
      if (translate_commit(source, *untranslated_first, new_parents,
                           parent_revs, items, buffers))
        return error("failed to translate side commit '" +
                     untranslated_first->commit->to_string() + "'");

      if (++untranslated_first == untranslated_last)
        return error("first parent missing from side_commits");
      progress.report_side();
    }
    if (translate_commit(source, *untranslated_first, new_parents, parent_revs,
                         items, buffers, &head, fparent.head_p))
      return error("failed to translate commit '" +
                   untranslated_first->commit->to_string() + "'");
    set_source_head(source, fparent.commit);
    ++untranslated_first;
    source.commits.count = untranslated_last - untranslated_first;
    source.commits.first = untranslated_first - q.commits.begin();
    progress.report_fparent();
  }
  progress.report();

  return 0;
}