killing of the buffer working

client/src/state/app/buffer.rs

@@ -63,5 +63,23 @@ impl BufferState {
     pub fn get_active_view(&self) -> Option<&AppView> {
         self.history.get(self.active_index)
     }
+
+    /// Removes the currently active buffer from the history.
+    /// Sets the new active buffer to the one preceding the closed one.
+    /// Returns `true` if a buffer was closed, `false` otherwise (e.g., only one buffer left).
+    pub fn close_active_buffer(&mut self) -> bool {
+        if self.history.len() <= 1 {
+            return false; // Cannot close the last buffer
+        }
+
+        let current_index = self.active_index;
+        self.history.remove(current_index); // Remove the active buffer
+
+        // Set the new active index to the one *before* the closed one,
+        // ensuring it doesn't go below 0. This mimics closing a tab.
+        self.active_index = current_index.saturating_sub(1);
+
+        true
+    }
 }