Handle missing directory watch targets

Author: pasunboneleve

src/engine.rs

@@ -572,9 +572,10 @@ fn resolve_watch_registrations(
         .parent()
         .ok_or_else(|| anyhow!("watch target '{}' has no parent", target.path.display()))?;
     if immediate_parent.exists() {
+        let recursive = target.path.extension().is_none();
         return Ok(vec![CompiledWatchTarget {
             path: immediate_parent.to_path_buf(),
-            recursive: false,
+            recursive,
         }]);
     }
 
@@ -779,6 +780,29 @@ mod tests {
         );
     }
 
+    #[test]
+    fn resolve_watch_registration_uses_recursive_parent_for_missing_directory_like_target() {
+        let dir = tempdir().expect("tempdir");
+        let target = dir.path().join("content");
+
+        let registrations = resolve_watch_registrations(
+            &CompiledWatchTarget {
+                path: target,
+                recursive: false,
+            },
+            WatcherKind::Native,
+        )
+        .expect("resolve watch registration");
+
+        assert_eq!(
+            registrations,
+            vec![CompiledWatchTarget {
+                path: dir.path().to_path_buf(),
+                recursive: true,
+            }]
+        );
+    }
+
     #[test]
     fn resolve_watch_registration_climbs_recursively_when_parent_is_missing() {
         let dir = tempdir().expect("tempdir");