MartinYe1234 eaa996bbec repl: Show kernel error on notebook cell instead of hanging (#59137)
Closes AI-394

When the kernel isn't running — e.g. Python isn't installed, ipykernel
is missing, or the kernel failed to launch — clicking run on a notebook
cell would unconditionally enter the executing state and silently drop
the execute request. The cell then spun forever with no logs and no way
to cancel (the stop button only works on a running kernel).

This change makes `execute_cell` attempt to send the execute request
first, and only mark the cell as executing when the send succeeds. On
failure it:

- Renders the failure (including the original kernel launch error) as an
error output on the cell, reusing the same `ErrorView` used for Python
tracebacks
- Logs the reason at the moment run is clicked, instead of only once at
notebook open
- No longer swallows `try_send` errors when the kernel process has died

Also adds the first unit test for the notebook editor, which exercises
the production path end to end: a real `.ipynb` parsed via
`NotebookItem::try_open`, a kernelspec pointing at a nonexistent
interpreter selected through `ReplStore::set_active_kernelspec`, a real
failed process spawn, and assertions through the production save path
(`to_nbformat_cell`). Verified red/green: the test fails against the
previous behavior.

Note for future notebook tests: `NotebookEditor` renders a continuously
animating kernel status icon, so rendering it as a root view in a GPUI
test makes `run_until_parked` spin forever. The test creates the editor
inside an empty window instead.

Release Notes:

- N/A
2026-06-12 14:57:52 +00:00
2026-04-30 11:10:14 +00:00
2026-06-05 23:12:31 +00:00
2026-05-27 18:17:59 +00:00
2026-01-22 23:57:26 +05:30
WIP
2023-12-14 09:25:14 -07:00
2026-04-29 10:27:47 +00:00
2025-02-04 09:02:59 -05:00
2026-01-06 12:49:51 -08:00
2025-10-27 13:27:59 -04:00
2025-10-17 18:58:14 +00:00
2026-03-17 16:34:35 +00:00
2026-04-29 10:27:47 +00:00
2026-05-27 16:27:18 +00:00

Zed

Zed CI

Welcome to Zed, a high-performance, multiplayer code editor from the creators of Atom and Tree-sitter.


Installation

On macOS, Linux, and Windows you can download Zed directly or install Zed via your local package manager (macOS/Linux/Windows).

Other platforms are not yet available:

Developing Zed

Contributing

See CONTRIBUTING.md for ways you can contribute to Zed.

Also... we're hiring! Check out our jobs page for open roles.

Licensing

Zed source code is licensed primarily under GPL-3.0-or-later, with Apache-2.0 components where marked.

License information for third party dependencies must be correctly provided for CI to pass.

We use cargo-about to automatically comply with open source licenses. If CI is failing, check the following:

  • Is it showing a no license specified error for a crate you've created? If so, add publish = false under [package] in your crate's Cargo.toml.
  • Is the error failed to satisfy license requirements for a dependency? If so, first determine what license the project has and whether this system is sufficient to comply with this license's requirements. If you're unsure, ask a lawyer. Once you've verified that this system is acceptable add the license's SPDX identifier to the accepted array in script/licenses/zed-licenses.toml.
  • Is cargo-about unable to find the license for a dependency? If so, add a clarification field at the end of script/licenses/zed-licenses.toml, as specified in the cargo-about book.

Sponsorship

Zed is developed by Zed Industries, Inc., a for-profit company.

If you’d like to financially support the project, you can do so via GitHub Sponsors. Sponsorships go directly to Zed Industries and are used as general company revenue. There are no perks or entitlements associated with sponsorship.

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