This PR adds the `cli_default_open_behavior` setting and a first-run TUI
prompt
that appears when `zed <path>` is invoked without flags while existing
windows are
open and the setting hasn't been configured yet.
## What it does
### Setting and prompt
- Adds a new `cli_default_open_behavior` workspace setting with two
values:
`existing_window` (default) and `new_window`.
- When the user runs `zed <path>` for the first time with existing Zed
windows
open, a `dialoguer::Select` prompt in the CLI asks them to choose their
preferred behavior. The choice is persisted to `settings.json`.
- The prompt is skipped when:
- An explicit flag (`-n`, `-e`, `-a`) is given
- No existing Zed windows are open
- The setting is already configured in `settings.json`
- The paths being opened are already contained in an existing workspace
### IPC transport abstraction
- Introduces a `CliResponseSink` trait in the `cli` crate that abstracts
`IpcSender<CliResponse>`, with an implementation for the real IPC
sender.
- Replaces `IpcSender<CliResponse>` with `Box<dyn CliResponseSink>` /
`&dyn CliResponseSink` across all signatures in `open_listener.rs`:
`OpenRequestKind::CliConnection`, `handle_cli_connection`,
`maybe_prompt_open_behavior`, `open_workspaces`, `open_local_workspace`.
- Extracts the inline CLI response loop from `main.rs` into a testable
`cli::run_cli_response_loop` function.
- Switches the request channel from bounded `mpsc::channel(16)` to
`mpsc::unbounded()`, eliminating `smol::block_on` in the bridge thread.
### End-to-end tests
Seven new tests exercise both the CLI-side response loop and the
Zed-side
handler connected through in-memory channels, using `allow_parking()` so
the
real `cli::run_cli_response_loop` runs on an OS thread while the GPUI
executor
drives the Zed handler:
- No flags, no windows → no prompt, opens new window
- No flags, existing windows, user picks "existing window" → prompt,
setting persisted
- No flags, existing windows, user picks "new window" → prompt, setting
persisted
- Setting already configured → no prompt
- Paths already in existing workspace → no prompt
- Explicit `-e` flag → no prompt
- Explicit `-n` flag → no prompt
Existing tests that previously used `ipc::channel()` now use a
`DiscardResponseSink`, removing OS-level IPC from all tests.
Release Notes:
- Added a first-run prompt when using `zed <path>` to choose between
opening
in an existing window or a new window. The choice is saved to settings
and
can be changed later via the `cli_default_open_behavior` setting.
---------
Co-authored-by: Nathan Sobo <nathan@zed.dev>
