Handle remove-create renames

libmarlin/Cargo.toml

@@ -18,6 +18,7 @@ tracing            = "0.1"
 tracing-subscriber = { version = "0.3", features = ["fmt", "env-filter"] }
 walkdir            = "2.5"
 shlex              = "1.3"
+same-file         = "1"
 shellexpand        = "3.1"
 serde_json         = { version = "1", optional = true }
 

libmarlin/src/watcher.rs

@@ -12,6 +12,7 @@ use notify::{
     event::{ModifyKind, RemoveKind, RenameMode},
     Event, EventKind, RecommendedWatcher, RecursiveMode, Watcher as NotifyWatcherTrait,
 };
+use same_file::Handle;
 use std::collections::HashMap;
 use std::path::PathBuf;
 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
@@ -84,6 +85,61 @@ struct EventDebouncer {
     last_flush: Instant,
 }
 
+#[derive(Default)]
+struct RemoveTracker {
+    map: HashMap<u64, (PathBuf, Instant)>,
+}
+
+impl RemoveTracker {
+    fn record(&mut self, path: &PathBuf) {
+        if let Ok(h) = Handle::from_path(path) {
+            self.map.insert(h.ino(), (path.clone(), Instant::now()));
+        } else {
+            // fall back to hashing path if inode not available
+            use std::collections::hash_map::DefaultHasher;
+            use std::hash::{Hash, Hasher};
+            let mut hasher = DefaultHasher::new();
+            path.hash(&mut hasher);
+            self.map
+                .insert(hasher.finish(), (path.clone(), Instant::now()));
+        }
+    }
+
+    fn match_create(&mut self, path: &PathBuf, window: Duration) -> Option<PathBuf> {
+        if let Ok(h) = Handle::from_path(path) {
+            if let Some((old, ts)) = self.map.remove(&h.ino()) {
+                if Instant::now().duration_since(ts) <= window {
+                    return Some(old);
+                } else {
+                    return None;
+                }
+            }
+        }
+        None
+    }
+
+    fn flush_expired(&mut self, window: Duration, debouncer: &mut EventDebouncer) {
+        let now = Instant::now();
+        let mut expired = Vec::new();
+        for (ino, (path, ts)) in &self.map {
+            if now.duration_since(*ts) > window {
+                debouncer.add_event(ProcessedEvent {
+                    path: path.clone(),
+                    old_path: None,
+                    new_path: None,
+                    kind: EventKind::Remove(RemoveKind::Any),
+                    priority: EventPriority::Delete,
+                    timestamp: *ts,
+                });
+                expired.push(*ino);
+            }
+        }
+        for ino in expired {
+            self.map.remove(&ino);
+        }
+    }
+}
+
 impl EventDebouncer {
     fn new(debounce_window_ms: u64) -> Self {
         Self {
@@ -187,7 +243,7 @@ impl FileWatcher {
         let processor_thread = thread::spawn(move || {
             let mut debouncer = EventDebouncer::new(config_clone.debounce_ms);
             let mut rename_cache: HashMap<usize, PathBuf> = HashMap::new();
-            let mut pending_remove: Option<(PathBuf, Instant)> = None;
+            let mut remove_tracker = RemoveTracker::default();
 
             while !stop_flag_clone.load(Ordering::Relaxed) {
                 // honour current state
@@ -223,38 +279,27 @@ impl FileWatcher {
 
                             // ── per-event logic ───────────────────────────────
                             match event.kind {
-                                // 1. remove-then-create → rename heuristic
+                                // 1. remove-then-create → rename heuristic using inode
                                 EventKind::Remove(_) if event.paths.len() == 1 => {
-                                    pending_remove = Some((event.paths[0].clone(), Instant::now()));
+                                    remove_tracker.record(&event.paths[0]);
                                 }
 
                                 EventKind::Create(_) if event.paths.len() == 1 => {
-                                    if let Some((old_p, ts)) = pending_remove.take() {
-                                        if Instant::now().duration_since(ts)
-                                            <= Duration::from_millis(500)
-                                        {
-                                            let new_p = event.paths[0].clone();
-                                            debouncer.add_event(ProcessedEvent {
-                                                path: old_p.clone(),
-                                                old_path: Some(old_p),
-                                                new_path: Some(new_p),
-                                                kind: EventKind::Modify(ModifyKind::Name(
-                                                    RenameMode::Both,
-                                                )),
-                                                priority: prio,
-                                                timestamp: Instant::now(),
-                                            });
-                                            continue; // handled as rename
-                                        } else {
-                                            debouncer.add_event(ProcessedEvent {
-                                                path: old_p.clone(),
-                                                old_path: None,
-                                                new_path: None,
-                                                kind: EventKind::Remove(RemoveKind::Any),
-                                                priority: EventPriority::Delete,
-                                                timestamp: ts,
-                                            });
-                                        }
+                                    if let Some(old_p) = remove_tracker
+                                        .match_create(&event.paths[0], Duration::from_millis(500))
+                                    {
+                                        let new_p = event.paths[0].clone();
+                                        debouncer.add_event(ProcessedEvent {
+                                            path: old_p.clone(),
+                                            old_path: Some(old_p),
+                                            new_path: Some(new_p),
+                                            kind: EventKind::Modify(ModifyKind::Name(
+                                                RenameMode::Both,
+                                            )),
+                                            priority: prio,
+                                            timestamp: Instant::now(),
+                                        });
+                                        continue;
                                     }
 
                                     for p in event.paths {
@@ -377,21 +422,8 @@ impl FileWatcher {
                     }
                 }
 
-                // deal with orphaned remove
-                if let Some((old_p, ts)) = pending_remove.take() {
-                    if Instant::now().duration_since(ts) > Duration::from_millis(500) {
-                        debouncer.add_event(ProcessedEvent {
-                            path: old_p.clone(),
-                            old_path: None,
-                            new_path: None,
-                            kind: EventKind::Remove(RemoveKind::Any),
-                            priority: EventPriority::Delete,
-                            timestamp: ts,
-                        });
-                    } else {
-                        pending_remove = Some((old_p, ts));
-                    }
-                }
+                // deal with orphaned removes
+                remove_tracker.flush_expired(Duration::from_millis(500), &mut debouncer);
 
                 queue_size_clone.store(debouncer.len(), Ordering::SeqCst);
 
@@ -438,6 +470,7 @@ impl FileWatcher {
             } // main loop
 
             // final flush on shutdown
+            remove_tracker.flush_expired(Duration::from_millis(500), &mut debouncer);
             if debouncer.len() > 0 {
                 let final_evts = debouncer.flush();
                 events_processed_clone.fetch_add(final_evts.len(), Ordering::SeqCst);
@@ -777,6 +810,45 @@ mod event_debouncer_tests {
         assert_eq!(flushed.len(), 2);
         assert!(flushed.iter().any(|e| e.path == dir));
     }
+
+    #[test]
+    fn remove_create_same_inode_produces_rename() {
+        let tmp = tempfile::tempdir().unwrap();
+        let old_p = tmp.path().join("old.txt");
+        std::fs::write(&old_p, b"hi").unwrap();
+
+        let mut debouncer = EventDebouncer::new(100);
+        let mut tracker = RemoveTracker::default();
+
+        tracker.record(&old_p);
+
+        let new_p = tmp.path().join("new.txt");
+        std::fs::rename(&old_p, &new_p).unwrap();
+
+        if let Some(orig) = tracker.match_create(&new_p, Duration::from_millis(500)) {
+            debouncer.add_event(ProcessedEvent {
+                path: orig.clone(),
+                old_path: Some(orig),
+                new_path: Some(new_p.clone()),
+                kind: EventKind::Modify(ModifyKind::Name(RenameMode::Both)),
+                priority: EventPriority::Modify,
+                timestamp: Instant::now(),
+            });
+        }
+
+        tracker.flush_expired(Duration::from_millis(500), &mut debouncer);
+        let flushed = debouncer.flush();
+        assert_eq!(flushed.len(), 1);
+        assert_eq!(
+            flushed[0].kind,
+            EventKind::Modify(ModifyKind::Name(RenameMode::Both))
+        );
+        assert_eq!(
+            flushed[0].old_path.as_ref().unwrap(),
+            &tmp.path().join("old.txt")
+        );
+        assert_eq!(flushed[0].new_path.as_ref().unwrap(), &new_p);
+    }
 }
 
 #[cfg(test)]