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## Summary
Fixes #10866.
Introduces the `show_err_msg!` macro which will send a message to be
shown as a popup to the client via the `window/showMessage` LSP method.
## Test Plan
Insert various `show_err_msg!` calls in common code paths (for example,
at the beginning of `event_loop`) and confirm that these messages appear
in your editor.
To test that panicking works correctly, add this to the top of the `fn
run` definition in
`crates/ruff_server/src/server/api/requests/execute_command.rs`:
```rust
panic!("This should appear");
```
Then, try running a command like `Ruff: Format document` from the
command palette (`Ctrl/Cmd+Shift+P`). You should see the following
messages appear:

62 lines
2.2 KiB
Rust
62 lines
2.2 KiB
Rust
use std::sync::OnceLock;
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use lsp_types::notification::Notification;
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use crate::server::ClientSender;
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static MESSENGER: OnceLock<ClientSender> = OnceLock::new();
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pub(crate) fn init_messenger(client_sender: &ClientSender) {
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MESSENGER
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.set(client_sender.clone())
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.expect("messenger should only be initialized once");
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// unregister any previously registered panic hook
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let _ = std::panic::take_hook();
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// When we panic, try to notify the client.
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std::panic::set_hook(Box::new(move |panic_info| {
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if let Some(messenger) = MESSENGER.get() {
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let _ = messenger.send(lsp_server::Message::Notification(
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lsp_server::Notification {
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method: lsp_types::notification::ShowMessage::METHOD.into(),
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params: serde_json::to_value(lsp_types::ShowMessageParams {
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typ: lsp_types::MessageType::ERROR,
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message: String::from(
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"The Ruff language server exited with a panic. See the logs for more details."
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),
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})
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.unwrap_or_default(),
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},
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));
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}
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let backtrace = std::backtrace::Backtrace::force_capture();
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tracing::error!("{panic_info}\n{backtrace}");
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}));
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}
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pub(crate) fn show_message(message: String, message_type: lsp_types::MessageType) {
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MESSENGER
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.get()
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.expect("messenger should be initialized")
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.send(lsp_server::Message::Notification(
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lsp_server::Notification {
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method: lsp_types::notification::ShowMessage::METHOD.into(),
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params: serde_json::to_value(lsp_types::ShowMessageParams {
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typ: message_type,
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message,
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})
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.unwrap(),
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},
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))
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.expect("message should send");
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}
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/// Sends an error to the client with a formatted message. The error is sent in a
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/// `window/showMessage` notification.
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macro_rules! show_err_msg {
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($msg:expr$(, $($arg:tt),*)?) => {
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crate::message::show_message(::core::format_args!($msg, $($($arg),*)?).to_string(), lsp_types::MessageType::ERROR)
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};
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}
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