Allow completing slash command arguments from extensions (#13240)

This PR extends the extension API with support for completing slash
command arguments for slash commands defined in extensions.

Release Notes:

- N/A

crates/assistant/src/slash_command/active_command.rs

@@ -6,6 +6,7 @@ use anyhow::{anyhow, Result};
 use editor::Editor;
 use gpui::{AppContext, Task, WeakView};
 use language::LspAdapterDelegate;
+use std::sync::atomic::AtomicBool;
 use std::sync::Arc;
 use ui::WindowContext;
 use workspace::Workspace;
@@ -26,9 +27,9 @@ impl SlashCommand for ActiveSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         _query: String,
-        _cancel: std::sync::Arc<std::sync::atomic::AtomicBool>,
+        _cancel: Arc<AtomicBool>,
         _workspace: Option<WeakView<Workspace>>,
         _cx: &mut AppContext,
     ) -> Task<Result<Vec<String>>> {

crates/assistant/src/slash_command/default_command.rs

@@ -31,7 +31,7 @@ impl SlashCommand for DefaultSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         _query: String,
         _cancellation_flag: Arc<AtomicBool>,
         _workspace: Option<WeakView<Workspace>>,

crates/assistant/src/slash_command/diagnostics_command.rs

@@ -98,7 +98,7 @@ impl SlashCommand for DiagnosticsCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         query: String,
         cancellation_flag: Arc<AtomicBool>,
         workspace: Option<WeakView<Workspace>>,

crates/assistant/src/slash_command/fetch_command.rs

@@ -113,7 +113,7 @@ impl SlashCommand for FetchSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         _query: String,
         _cancel: Arc<AtomicBool>,
         _workspace: Option<WeakView<Workspace>>,

crates/assistant/src/slash_command/file_command.rs

@@ -101,7 +101,7 @@ impl SlashCommand for FileSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         query: String,
         cancellation_flag: Arc<AtomicBool>,
         workspace: Option<WeakView<Workspace>>,

crates/assistant/src/slash_command/now_command.rs

@@ -29,7 +29,7 @@ impl SlashCommand for NowSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         _query: String,
         _cancel: Arc<AtomicBool>,
         _workspace: Option<WeakView<Workspace>>,

crates/assistant/src/slash_command/project_command.rs

@@ -102,7 +102,7 @@ impl SlashCommand for ProjectSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         _query: String,
         _cancel: Arc<AtomicBool>,
         _workspace: Option<WeakView<Workspace>>,

crates/assistant/src/slash_command/prompt_command.rs

@@ -28,7 +28,7 @@ impl SlashCommand for PromptSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         query: String,
         _cancellation_flag: Arc<AtomicBool>,
         _workspace: Option<WeakView<Workspace>>,

crates/assistant/src/slash_command/rustdoc_command.rs

@@ -107,7 +107,7 @@ impl SlashCommand for RustdocSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         query: String,
         _cancel: Arc<AtomicBool>,
         workspace: Option<WeakView<Workspace>>,

crates/assistant/src/slash_command/search_command.rs

@@ -47,7 +47,7 @@ impl SlashCommand for SearchSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         _query: String,
         _cancel: Arc<AtomicBool>,
         _workspace: Option<WeakView<Workspace>>,

crates/assistant/src/slash_command/tabs_command.rs

@@ -31,7 +31,7 @@ impl SlashCommand for TabsSlashCommand {
     }
 
     fn complete_argument(
-        &self,
+        self: Arc<Self>,
         _query: String,
         _cancel: Arc<std::sync::atomic::AtomicBool>,
         _workspace: Option<WeakView<Workspace>>,