assistant2: Add Thread::send_to_model method (#25703)

This PR adds a new `send_to_model` method to the `Thread` to encapsulate
more of the thread-specific capabilities.

We then call this in `MessageEditor::send_to_model`.

Release Notes:

- N/A

crates/assistant2/src/message_editor.rs

@@ -7,7 +7,7 @@ use gpui::{
     pulsating_between, Animation, AnimationExt, App, DismissEvent, Entity, Focusable, Subscription,
     TextStyle, WeakEntity,
 };
-use language_model::{LanguageModelRegistry, LanguageModelRequestTool};
+use language_model::LanguageModelRegistry;
 use language_model_selector::LanguageModelSelector;
 use rope::Point;
 use settings::Settings;
@@ -205,22 +205,7 @@ impl MessageEditor {
                 .update(&mut cx, |thread, cx| {
                     let context = context_store.read(cx).snapshot(cx).collect::<Vec<_>>();
                     thread.insert_user_message(user_message, context, cx);
-                    let mut request = thread.to_completion_request(request_kind, cx);
-
-                    if use_tools {
-                        request.tools = thread
-                            .tools()
-                            .tools(cx)
-                            .into_iter()
-                            .map(|tool| LanguageModelRequestTool {
-                                name: tool.name(),
-                                description: tool.description(),
-                                input_schema: tool.input_schema(),
-                            })
-                            .collect();
-                    }
-
-                    thread.stream_completion(request, model, cx)
+                    thread.send_to_model(model, request_kind, use_tools, cx);
                 })
                 .ok();
         })

crates/assistant2/src/thread.rs

@@ -9,9 +9,9 @@ use futures::{FutureExt as _, StreamExt as _};
 use gpui::{App, Context, EventEmitter, SharedString, Task};
 use language_model::{
     LanguageModel, LanguageModelCompletionEvent, LanguageModelRegistry, LanguageModelRequest,
-    LanguageModelRequestMessage, LanguageModelToolResult, LanguageModelToolUse,
-    LanguageModelToolUseId, MaxMonthlySpendReachedError, MessageContent, PaymentRequiredError,
-    Role, StopReason,
+    LanguageModelRequestMessage, LanguageModelRequestTool, LanguageModelToolResult,
+    LanguageModelToolUse, LanguageModelToolUseId, MaxMonthlySpendReachedError, MessageContent,
+    PaymentRequiredError, Role, StopReason,
 };
 use serde::{Deserialize, Serialize};
 use util::{post_inc, TryFutureExt as _};
@@ -314,6 +314,31 @@ impl Thread {
         text
     }
 
+    pub fn send_to_model(
+        &mut self,
+        model: Arc<dyn LanguageModel>,
+        request_kind: RequestKind,
+        use_tools: bool,
+        cx: &mut Context<Self>,
+    ) {
+        let mut request = self.to_completion_request(request_kind, cx);
+
+        if use_tools {
+            request.tools = self
+                .tools()
+                .tools(cx)
+                .into_iter()
+                .map(|tool| LanguageModelRequestTool {
+                    name: tool.name(),
+                    description: tool.description(),
+                    input_schema: tool.input_schema(),
+                })
+                .collect();
+        }
+
+        self.stream_completion(request, model, cx);
+    }
+
     pub fn to_completion_request(
         &self,
         request_kind: RequestKind,