Show error+warning counts in project diagnostics tab

Allow workspace items' tab contents to be arbitrary elements

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

crates/editor/src/editor.rs

@@ -535,6 +535,19 @@ impl Editor {
         &self.buffer
     }
 
+    pub fn title(&self, cx: &AppContext) -> String {
+        let filename = self
+            .buffer()
+            .read(cx)
+            .file(cx)
+            .and_then(|file| file.file_name());
+        if let Some(name) = filename {
+            name.to_string_lossy().into()
+        } else {
+            "untitled".into()
+        }
+    }
+
     pub fn snapshot(&mut self, cx: &mut MutableAppContext) -> EditorSnapshot {
         EditorSnapshot {
             mode: self.mode,
@@ -3619,8 +3632,8 @@ impl Editor {
             language::Event::Edited => cx.emit(Event::Edited),
             language::Event::Dirtied => cx.emit(Event::Dirtied),
             language::Event::Saved => cx.emit(Event::Saved),
-            language::Event::FileHandleChanged => cx.emit(Event::FileHandleChanged),
-            language::Event::Reloaded => cx.emit(Event::FileHandleChanged),
+            language::Event::FileHandleChanged => cx.emit(Event::TitleChanged),
+            language::Event::Reloaded => cx.emit(Event::TitleChanged),
             language::Event::Closed => cx.emit(Event::Closed),
             _ => {}
         }
@@ -3727,7 +3740,7 @@ pub enum Event {
     Blurred,
     Dirtied,
     Saved,
-    FileHandleChanged,
+    TitleChanged,
     Closed,
 }
 

crates/editor/src/items.rs

@@ -102,17 +102,9 @@ impl ItemView for Editor {
         BufferItemHandle(self.buffer.read(cx).as_singleton().unwrap())
     }
 
-    fn title(&self, cx: &AppContext) -> String {
-        let filename = self
-            .buffer()
-            .read(cx)
-            .file(cx)
-            .and_then(|file| file.file_name());
-        if let Some(name) = filename {
-            name.to_string_lossy().into()
-        } else {
-            "untitled".into()
-        }
+    fn tab_content(&self, style: &theme::Tab, cx: &AppContext) -> ElementBox {
+        let title = self.title(cx);
+        Label::new(title, style.label.clone()).boxed()
     }
 
     fn project_path(&self, cx: &AppContext) -> Option<ProjectPath> {
@@ -218,10 +210,7 @@ impl ItemView for Editor {
     }
 
     fn should_update_tab_on_event(event: &Event) -> bool {
-        matches!(
-            event,
-            Event::Saved | Event::Dirtied | Event::FileHandleChanged
-        )
+        matches!(event, Event::Saved | Event::Dirtied | Event::TitleChanged)
     }
 }