diff --git a/01.workspace/heave/src/imp/catalog_ensure_init.rs b/01.workspace/heave/src/imp/catalog_ensure_init.rs
new file mode 100644
index 0000000..d6b61f2
--- /dev/null
+++ b/01.workspace/heave/src/imp/catalog_ensure_init.rs
@@ -0,0 +1,12 @@
+use crate::*;
+
+impl Catalog {
+    pub fn ensure_init(&mut self) -> Result<(), FailedTo> {
+        if self.already_init {
+            return Ok(());
+        }
+        let result = self.init()?;
+        self.already_init = true;
+        Ok(())
+    }
+}
diff --git a/01.workspace/heave/src/imp/mod.rs b/01.workspace/heave/src/imp/mod.rs
index cd85b9d..49dc13b 100644
--- a/01.workspace/heave/src/imp/mod.rs
+++ b/01.workspace/heave/src/imp/mod.rs
@@ -1,6 +1,7 @@
 pub mod bool_try_from_value;
 pub mod catalog_contains_key;
 pub mod catalog_delete;
+pub mod catalog_ensure_init;
 pub mod catalog_for_each;
 pub mod catalog_for_each_mut;
 pub mod catalog_get;
diff --git a/01.workspace/heave/src/str/catalog.rs b/01.workspace/heave/src/str/catalog.rs
index a071943..7fd7348 100644
--- a/01.workspace/heave/src/str/catalog.rs
+++ b/01.workspace/heave/src/str/catalog.rs
@@ -10,6 +10,7 @@ use std::sync::*;
 #[derive(Debug, Default)]
 pub struct O {
     pub(crate) path: String,
+    pub(crate) already_init: bool,
     items: Mutex<HashMap<String, Entity>>,
 }