add store::copy_path_to(src, from, dst, to)

1 files changed, 14 insertions, 4 deletions

diff --git a/src/document/store.rs b/src/document/store.rs
index 1815635..9db8300 100644
--- a/src/document/store.rs
+++ b/src/document/store.rs
@@ -296,10 +296,20 @@ pub(crate) fn copy_path(
     dst: &mut AutoCommit,
     path: &[String],
 ) -> Result<(), StoreError> {
-    let (leaf, parents) = path.split_last().ok_or(StoreError::NotFound)?;
+    copy_path_to(src, path, dst, path)
+}
+
+/// Like [`copy_path`], but puts what `src` holds at `from` at `to` in `dst`.
+pub(crate) fn copy_path_to(
+    src: &AutoCommit,
+    from: &[String],
+    dst: &mut AutoCommit,
+    to: &[String],
+) -> Result<(), StoreError> {
+    let (leaf, parents) = to.split_last().ok_or(StoreError::NotFound)?;
 
-    let Some(resolved) = resolve_at(src, path)? else {
-        return match delete_path(dst, path, false) {
+    let Some(resolved) = resolve_at(src, from)? else {
+        return match delete_path(dst, to, false) {
             Ok(()) | Err(StoreError::NotFound) => Ok(()),
             Err(error) => Err(error),
         };
@@ -307,7 +317,7 @@ pub(crate) fn copy_path(
 
     let maps = ensure_maps(dst, parents)?;
     delete_in_all(dst, &maps, leaf)?;
-    let mut trace = path.to_vec();
+    let mut trace = from.to_vec();
     copy_resolved(
         src,
         &resolved,