assistant2: Update to match latest designs (#21818)

This PR updates the Assistant2 panel to match the latest designs.

<img width="1159" alt="Screenshot 2024-12-10 at 11 49 14 AM"
src="https://github.com/user-attachments/assets/53739709-e7b9-4e35-8a5d-97b6560623ed">

Release Notes:

- N/A

crates/assistant2/src/assistant_panel.rs

@@ -9,10 +9,8 @@ use gpui::{
     WindowContext,
 };
 use language::LanguageRegistry;
-use language_model::LanguageModelRegistry;
-use language_model_selector::LanguageModelSelector;
 use time::UtcOffset;
-use ui::{prelude::*, ButtonLike, Divider, IconButtonShape, KeyBinding, Tab, Tooltip};
+use ui::{prelude::*, Divider, IconButtonShape, KeyBinding, Tab, Tooltip};
 use workspace::dock::{DockPosition, Panel, PanelEvent};
 use workspace::Workspace;
 
@@ -21,7 +19,7 @@ use crate::message_editor::MessageEditor;
 use crate::thread::{ThreadError, ThreadId};
 use crate::thread_history::{PastThread, ThreadHistory};
 use crate::thread_store::ThreadStore;
-use crate::{NewThread, OpenHistory, ToggleFocus, ToggleModelSelector};
+use crate::{NewThread, OpenHistory, ToggleFocus};
 
 pub fn init(cx: &mut AppContext) {
     cx.observe_new_views(
@@ -225,7 +223,6 @@ impl AssistantPanel {
             .child(
                 h_flex()
                     .gap(DynamicSpacing::Base08.rems(cx))
-                    .child(self.render_language_model_selector(cx))
                     .child(Divider::vertical())
                     .child(
                         IconButton::new("new-thread", IconName::Plus)
@@ -280,57 +277,6 @@ impl AssistantPanel {
             )
     }
 
-    fn render_language_model_selector(&self, cx: &mut ViewContext<Self>) -> impl IntoElement {
-        let active_provider = LanguageModelRegistry::read_global(cx).active_provider();
-        let active_model = LanguageModelRegistry::read_global(cx).active_model();
-
-        LanguageModelSelector::new(
-            |model, _cx| {
-                println!("Selected {:?}", model.name());
-            },
-            ButtonLike::new("active-model")
-                .style(ButtonStyle::Subtle)
-                .child(
-                    h_flex()
-                        .w_full()
-                        .gap_0p5()
-                        .child(
-                            div()
-                                .overflow_x_hidden()
-                                .flex_grow()
-                                .whitespace_nowrap()
-                                .child(match (active_provider, active_model) {
-                                    (Some(provider), Some(model)) => h_flex()
-                                        .gap_1()
-                                        .child(
-                                            Icon::new(
-                                                model.icon().unwrap_or_else(|| provider.icon()),
-                                            )
-                                            .color(Color::Muted)
-                                            .size(IconSize::XSmall),
-                                        )
-                                        .child(
-                                            Label::new(model.name().0)
-                                                .size(LabelSize::Small)
-                                                .color(Color::Muted),
-                                        )
-                                        .into_any_element(),
-                                    _ => Label::new("No model selected")
-                                        .size(LabelSize::Small)
-                                        .color(Color::Muted)
-                                        .into_any_element(),
-                                }),
-                        )
-                        .child(
-                            Icon::new(IconName::ChevronDown)
-                                .color(Color::Muted)
-                                .size(IconSize::XSmall),
-                        ),
-                )
-                .tooltip(move |cx| Tooltip::for_action("Change Model", &ToggleModelSelector, cx)),
-        )
-    }
-
     fn render_active_thread_or_empty_state(&self, cx: &mut ViewContext<Self>) -> AnyElement {
         if self.thread.read(cx).is_empty() {
             return self.render_thread_empty_state(cx).into_any_element();
@@ -358,46 +304,6 @@ impl AssistantPanel {
                         .mb_4(),
                 ),
             )
-            .child(v_flex())
-            .child(
-                h_flex()
-                    .w_full()
-                    .justify_center()
-                    .child(Label::new("Context Examples:").size(LabelSize::Small)),
-            )
-            .child(
-                h_flex()
-                    .gap_2()
-                    .justify_center()
-                    .child(
-                        h_flex()
-                            .gap_1()
-                            .p_0p5()
-                            .rounded_md()
-                            .border_1()
-                            .border_color(cx.theme().colors().border_variant)
-                            .child(
-                                Icon::new(IconName::Terminal)
-                                    .size(IconSize::Small)
-                                    .color(Color::Disabled),
-                            )
-                            .child(Label::new("Terminal").size(LabelSize::Small)),
-                    )
-                    .child(
-                        h_flex()
-                            .gap_1()
-                            .p_0p5()
-                            .rounded_md()
-                            .border_1()
-                            .border_color(cx.theme().colors().border_variant)
-                            .child(
-                                Icon::new(IconName::Folder)
-                                    .size(IconSize::Small)
-                                    .color(Color::Disabled),
-                            )
-                            .child(Label::new("/src/components").size(LabelSize::Small)),
-                    ),
-            )
             .when(!recent_threads.is_empty(), |parent| {
                 parent
                     .child(

crates/assistant2/src/message_editor.rs

@@ -1,17 +1,18 @@
 use editor::{Editor, EditorElement, EditorStyle};
 use gpui::{AppContext, FocusableView, Model, TextStyle, View};
 use language_model::{LanguageModelRegistry, LanguageModelRequestTool};
+use language_model_selector::LanguageModelSelector;
 use picker::Picker;
 use settings::Settings;
 use theme::ThemeSettings;
 use ui::{
     prelude::*, ButtonLike, CheckboxWithLabel, ElevationIndex, IconButtonShape, KeyBinding,
-    PopoverMenuHandle,
+    PopoverMenuHandle, Tooltip,
 };
 
 use crate::context_picker::{ContextPicker, ContextPickerDelegate};
 use crate::thread::{RequestKind, Thread};
-use crate::Chat;
+use crate::{Chat, ToggleModelSelector};
 
 pub struct MessageEditor {
     thread: Model<Thread>,
@@ -26,7 +27,7 @@ impl MessageEditor {
             thread,
             editor: cx.new_view(|cx| {
                 let mut editor = Editor::auto_height(80, cx);
-                editor.set_placeholder_text("Ask anything…", cx);
+                editor.set_placeholder_text("Ask anything or type @ to add context", cx);
 
                 editor
             }),
@@ -84,6 +85,57 @@ impl MessageEditor {
 
         None
     }
+
+    fn render_language_model_selector(&self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let active_provider = LanguageModelRegistry::read_global(cx).active_provider();
+        let active_model = LanguageModelRegistry::read_global(cx).active_model();
+
+        LanguageModelSelector::new(
+            |model, _cx| {
+                println!("Selected {:?}", model.name());
+            },
+            ButtonLike::new("active-model")
+                .style(ButtonStyle::Subtle)
+                .child(
+                    h_flex()
+                        .w_full()
+                        .gap_0p5()
+                        .child(
+                            div()
+                                .overflow_x_hidden()
+                                .flex_grow()
+                                .whitespace_nowrap()
+                                .child(match (active_provider, active_model) {
+                                    (Some(provider), Some(model)) => h_flex()
+                                        .gap_1()
+                                        .child(
+                                            Icon::new(
+                                                model.icon().unwrap_or_else(|| provider.icon()),
+                                            )
+                                            .color(Color::Muted)
+                                            .size(IconSize::XSmall),
+                                        )
+                                        .child(
+                                            Label::new(model.name().0)
+                                                .size(LabelSize::Small)
+                                                .color(Color::Muted),
+                                        )
+                                        .into_any_element(),
+                                    _ => Label::new("No model selected")
+                                        .size(LabelSize::Small)
+                                        .color(Color::Muted)
+                                        .into_any_element(),
+                                }),
+                        )
+                        .child(
+                            Icon::new(IconName::ChevronDown)
+                                .color(Color::Muted)
+                                .size(IconSize::XSmall),
+                        ),
+                )
+                .tooltip(move |cx| Tooltip::for_action("Change Model", &ToggleModelSelector, cx)),
+        )
+    }
 }
 
 impl FocusableView for MessageEditor {
@@ -152,13 +204,12 @@ impl Render for MessageEditor {
                     .child(
                         h_flex()
                             .gap_2()
-                            .child(Button::new("codebase", "Codebase").style(ButtonStyle::Filled))
+                            .child(self.render_language_model_selector(cx))
-                            .child(Label::new("or"))
                             .child(
                                 ButtonLike::new("chat")
                                     .style(ButtonStyle::Filled)
                                     .layer(ElevationIndex::ModalSurface)
-                                    .child(Label::new("Chat"))
+                                    .child(Label::new("Submit"))
                                     .children(
                                         KeyBinding::for_action_in(&Chat, &focus_handle, cx)
                                             .map(|binding| binding.into_any_element()),