1 files changed, 28 insertions, 0 deletions
diff --git a/rust/crates/commands/src/preview_tracker.rs b/rust/crates/commands/src/preview_tracker.rs
new file mode 100644
index 00000000..4eb7484d
--- /dev/null
+++ b/rust/crates/commands/src/preview_tracker.rs
@@ -0,0 +1,28 @@
+#[derive(Clone, Debug, Default)]
+pub struct PreviewTracker<T> {
+    snapshot: Option<T>,
+}
+
+impl<T: Clone> PreviewTracker<T> {
+    pub fn new() -> Self {
+        Self { snapshot: None }
+    }
+
+    pub fn begin(&mut self, state: &T) {
+        if self.snapshot.is_none() {
+            self.snapshot = Some(state.clone());
+        }
+    }
+
+    pub fn is_active(&self) -> bool {
+        self.snapshot.is_some()
+    }
+
+    pub fn snapshot(&self) -> Option<&T> {
+        self.snapshot.as_ref()
+    }
+
+    pub fn end(&mut self) -> Option<T> {
+        self.snapshot.take()
+    }
+}