linux: Primary clipboard (#10534)

Implements copying from and pasting to the primary selection.

Release Notes:

- N/A

crates/gpui/src/platform/linux/headless/client.rs

@@ -79,8 +79,14 @@ impl LinuxClient for HeadlessClient {
     //todo(linux)
     fn set_cursor_style(&self, _style: CursorStyle) {}
 
+    fn write_to_primary(&self, item: crate::ClipboardItem) {}
+
     fn write_to_clipboard(&self, item: crate::ClipboardItem) {}
 
+    fn read_from_primary(&self) -> Option<crate::ClipboardItem> {
+        None
+    }
+
     fn read_from_clipboard(&self) -> Option<crate::ClipboardItem> {
         None
     }

crates/gpui/src/platform/linux/platform.rs

@@ -56,7 +56,9 @@ pub trait LinuxClient {
         options: WindowParams,
     ) -> Box<dyn PlatformWindow>;
     fn set_cursor_style(&self, style: CursorStyle);
+    fn write_to_primary(&self, item: ClipboardItem);
     fn write_to_clipboard(&self, item: ClipboardItem);
+    fn read_from_primary(&self) -> Option<ClipboardItem>;
     fn read_from_clipboard(&self) -> Option<ClipboardItem>;
     fn run(&self);
 }
@@ -406,7 +408,6 @@ impl<P: LinuxClient + 'static> Platform for P {
         })
     }
 
-    //todo(linux): add trait methods for accessing the primary selection
     fn read_credentials(&self, url: &str) -> Task<Result<Option<(String, Vec<u8>)>>> {
         let url = url.to_string();
         self.background_executor().spawn(async move {
@@ -461,10 +462,18 @@ impl<P: LinuxClient + 'static> Platform for P {
         Task::ready(Err(anyhow!("register_url_scheme unimplemented")))
     }
 
+    fn write_to_primary(&self, item: ClipboardItem) {
+        self.write_to_primary(item)
+    }
+
     fn write_to_clipboard(&self, item: ClipboardItem) {
         self.write_to_clipboard(item)
     }
 
+    fn read_from_primary(&self) -> Option<ClipboardItem> {
+        self.read_from_primary()
+    }
+
     fn read_from_clipboard(&self) -> Option<ClipboardItem> {
         self.read_from_clipboard()
     }

crates/gpui/src/platform/linux/wayland/client.rs

@@ -377,10 +377,26 @@ impl LinuxClient for WaylandClient {
             .log_err();
     }
 
+    fn write_to_primary(&self, item: crate::ClipboardItem) {
+        self.0.borrow_mut().primary.set_contents(item.text);
+    }
+
     fn write_to_clipboard(&self, item: crate::ClipboardItem) {
         self.0.borrow_mut().clipboard.set_contents(item.text);
     }
 
+    fn read_from_primary(&self) -> Option<crate::ClipboardItem> {
+        self.0
+            .borrow_mut()
+            .primary
+            .get_contents()
+            .ok()
+            .map(|s| crate::ClipboardItem {
+                text: s,
+                metadata: None,
+            })
+    }
+
     fn read_from_clipboard(&self) -> Option<crate::ClipboardItem> {
         self.0
             .borrow_mut()

crates/gpui/src/platform/linux/x11/client.rs

@@ -603,10 +603,26 @@ impl LinuxClient for X11Client {
     //todo(linux)
     fn set_cursor_style(&self, _style: CursorStyle) {}
 
+    fn write_to_primary(&self, item: crate::ClipboardItem) {
+        self.0.borrow_mut().primary.set_contents(item.text);
+    }
+
     fn write_to_clipboard(&self, item: crate::ClipboardItem) {
         self.0.borrow_mut().clipboard.set_contents(item.text);
     }
 
+    fn read_from_primary(&self) -> Option<crate::ClipboardItem> {
+        self.0
+            .borrow_mut()
+            .primary
+            .get_contents()
+            .ok()
+            .map(|text| crate::ClipboardItem {
+                text,
+                metadata: None,
+            })
+    }
+
     fn read_from_clipboard(&self) -> Option<crate::ClipboardItem> {
         self.0
             .borrow_mut()