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### Motivation To support remote Git graph usage, we need remote support for the Git APIs that the graph depends on. This PR adds remote support for `CommitDataHandler` (the `git cat-file --batch` process manager), allowing remote Git graph consumers to fetch visible commit data without polling. #### Summary The Git graph separates the UI and data layers so the UI can continue rendering while commit data is fetched in the background. This change extends that model to remote repositories by allowing `GitStore::fetch_commit_data(sha: Oid, await_result: bool, cx: &mut Context) -> &CommitDataState` to await remote commit loading. For simplicity, the `Starting` variant was removed from `CommitDataState`. `CommitDataState::Loading(Option<...>)` now stores `Some(...)` when `await_result == true` is passed to `fetch_commit_data`. This allows the data layer to await commit loading without polling, and only when explicitly requested. I also removed the `Graph` prefix from `CommitData`-related types because this API is general-purpose and not limited to the graph. Longer term, I hope to replace `Repository::show` with the commit data functionality, since it already provides built-in caching. #### Bug Fixes - Fix stale `Loading(...)` entries that survive enqueue failure or handler shutdown. - Fix commit data handler bookkeeping so `pending_requests`, `completion_senders`, and `CommitDataState` remain consistent. - Fix remote commit-data loading so the data layer can await results instead of polling. #### Testing - Add property tests for commit data fetching. - Add a collab integration test that verifies batched remote commit-data fetching. #### Follow Up In a follow-up, I want to replace the `Repository::show` backend with the commit data handler and remove `CommitDetails` from the codebase as a cleanup and maintenance pass. The commit data handler already provides caching and is a better long-term path for commit metadata access. I may also want to allow the `CommitData` type to propagate errors to callers. For the Git graph, the remaining work is remote search and initial data fetching. Self-Review Checklist: - [x] I've reviewed my own diff for quality, security, and reliability - [x] Unsafe blocks (if any) have justifying comments - [x] The content is consistent with the [UI/UX checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) - [x] Tests cover the new/changed behavior - [x] Performance impact has been considered and is acceptable Release Notes: - N/A --------- Co-authored-by: Remco Smits <djsmits12@gmail.com> |
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