Show message indicating when we're downloading language servers

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/workspace/src/lsp_status.rs

@@ -0,0 +1,65 @@
+use crate::{ItemViewHandle, Settings, StatusItemView};
+use futures::StreamExt;
+use gpui::{elements::*, Entity, RenderContext, View, ViewContext};
+use language::LanguageRegistry;
+use postage::watch;
+use std::sync::Arc;
+
+pub struct LspStatus {
+    pending_lsp_binaries: usize,
+    settings_rx: watch::Receiver<Settings>,
+}
+
+impl LspStatus {
+    pub fn new(
+        languages: Arc<LanguageRegistry>,
+        settings_rx: watch::Receiver<Settings>,
+        cx: &mut ViewContext<Self>,
+    ) -> Self {
+        let mut pending_lsp_binaries = languages.pending_lsp_binaries();
+        cx.spawn_weak(|this, mut cx| async move {
+            while let Some(pending_lsp_binaries) = pending_lsp_binaries.next().await {
+                if let Some(this) = this.upgrade(&cx) {
+                    this.update(&mut cx, |this, cx| {
+                        this.pending_lsp_binaries = pending_lsp_binaries;
+                        cx.notify();
+                    });
+                } else {
+                    break;
+                }
+            }
+        })
+        .detach();
+        Self {
+            pending_lsp_binaries: 0,
+            settings_rx,
+        }
+    }
+}
+
+impl Entity for LspStatus {
+    type Event = ();
+}
+
+impl View for LspStatus {
+    fn ui_name() -> &'static str {
+        "LspStatus"
+    }
+
+    fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
+        if self.pending_lsp_binaries == 0 {
+            Empty::new().boxed()
+        } else {
+            let theme = &self.settings_rx.borrow().theme;
+            Label::new(
+                "Downloading language servers...".to_string(),
+                theme.workspace.status_bar.lsp_message.clone(),
+            )
+            .boxed()
+        }
+    }
+}
+
+impl StatusItemView for LspStatus {
+    fn set_active_pane_item(&mut self, _: Option<&dyn ItemViewHandle>, _: &mut ViewContext<Self>) {}
+}

crates/workspace/src/status_bar.rs

@@ -42,17 +42,21 @@ impl View for StatusBar {
     fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
         let theme = &self.settings.borrow().theme.workspace.status_bar;
         Flex::row()
-            .with_children(
-                self.left_items
-                    .iter()
-                    .map(|i| ChildView::new(i.as_ref()).aligned().boxed()),
-            )
+            .with_children(self.left_items.iter().map(|i| {
+                ChildView::new(i.as_ref())
+                    .aligned()
+                    .contained()
+                    .with_margin_right(theme.item_spacing)
+                    .boxed()
+            }))
             .with_child(Empty::new().flexible(1., true).boxed())
-            .with_children(
-                self.right_items
-                    .iter()
-                    .map(|i| ChildView::new(i.as_ref()).aligned().boxed()),
-            )
+            .with_children(self.right_items.iter().map(|i| {
+                ChildView::new(i.as_ref())
+                    .aligned()
+                    .contained()
+                    .with_margin_left(theme.item_spacing)
+                    .boxed()
+            }))
             .contained()
             .with_style(theme.container)
             .constrained()

crates/workspace/src/workspace.rs

@@ -1,3 +1,4 @@
+pub mod lsp_status;
 pub mod menu;
 pub mod pane;
 pub mod pane_group;