Restructure verification code prompting to open a window instead

Also, prevent multiple calls to `sign_in` from racing with each other.

crates/copilot/src/sign_in.rs

@@ -0,0 +1,98 @@
+use crate::{request::PromptUserDeviceFlow, Copilot};
+use gpui::{
+    elements::*,
+    geometry::{rect::RectF, vector::vec2f},
+    Axis, Element, Entity, MutableAppContext, View, ViewContext, WindowKind, WindowOptions,
+};
+use settings::Settings;
+
+pub fn init(cx: &mut MutableAppContext) {
+    let copilot = Copilot::global(cx);
+
+    let mut code_verification_window_id = None;
+    cx.observe(&copilot, move |copilot, cx| {
+        match copilot.read(cx).status() {
+            crate::Status::SigningIn {
+                prompt: Some(prompt),
+            } => {
+                if let Some(window_id) = code_verification_window_id.take() {
+                    cx.remove_window(window_id);
+                }
+
+                let screen = cx.platform().screens().pop();
+                let (window_id, _) = cx.add_window(
+                    WindowOptions {
+                        bounds: gpui::WindowBounds::Fixed(RectF::new(
+                            vec2f(100., 100.),
+                            vec2f(300., 300.),
+                        )),
+                        titlebar: None,
+                        center: false,
+                        focus: false,
+                        kind: WindowKind::Normal,
+                        is_movable: true,
+                        screen,
+                    },
+                    |_| CopilotCodeVerification::new(prompt),
+                );
+                code_verification_window_id = Some(window_id);
+            }
+            _ => {
+                if let Some(window_id) = code_verification_window_id.take() {
+                    cx.remove_window(window_id);
+                }
+            }
+        }
+    })
+    .detach();
+}
+
+pub enum Event {
+    Dismiss,
+}
+
+pub struct CopilotCodeVerification {
+    prompt: PromptUserDeviceFlow,
+}
+
+impl Entity for CopilotCodeVerification {
+    type Event = Event;
+}
+
+impl View for CopilotCodeVerification {
+    fn ui_name() -> &'static str {
+        "CopilotCodeVerification"
+    }
+
+    fn render(&mut self, cx: &mut gpui::RenderContext<'_, Self>) -> gpui::ElementBox {
+        let style = cx.global::<Settings>().theme.copilot.clone();
+
+        let auth_text = style.auth_text.clone();
+        let prompt = self.prompt.clone();
+        Flex::new(Axis::Vertical)
+            .with_child(Label::new(prompt.user_code.clone(), auth_text.clone()).boxed())
+            .with_child(
+                MouseEventHandler::<Self>::new(1, cx, move |_state, _cx| {
+                    Label::new("Click here to open GitHub!", auth_text.clone()).boxed()
+                })
+                .on_click(gpui::MouseButton::Left, move |_click, cx| {
+                    cx.platform().open_url(&prompt.verification_uri)
+                })
+                .with_cursor_style(gpui::CursorStyle::PointingHand)
+                .boxed(),
+            )
+            .contained()
+            .with_style(style.auth_modal)
+            .named("Copilot Authentication status modal")
+    }
+
+    fn focus_out(&mut self, _: gpui::AnyViewHandle, cx: &mut ViewContext<Self>) {
+        cx.emit(Event::Dismiss)
+    }
+}
+
+impl CopilotCodeVerification {
+    pub fn new(prompt: PromptUserDeviceFlow) -> Self {
+        CopilotCodeVerification { prompt }
+    }
+}