feat: add user_requested_polling field for future polling mode detection

naoNao89 · naoNao89 · commit f0e6d8507375 · 2025-10-24T07:42:39.000+07:00
- Add user_requested_polling field to Observer struct
- Store original user intent when Observer is created
- Preserve distinction between user-requested vs system-forced polling
- Infrastructure for future FileAppeared message suppression in polling mode

Current implementation maintains existing behavior while providing
foundation for distinguishing explicit --use-polling from automatic
polling fallback
diff --git a/src/uu/tail/src/follow/watch.rs b/src/uu/tail/src/follow/watch.rs
@@ -162,6 +162,10 @@ pub struct Observer {
     /// platform specific event driven method. Since `use_polling` is subject to
     /// change during runtime it is moved out of [`Settings`].
     pub use_polling: bool,
+    
+    /// Tracks if user explicitly requested polling via --use-polling flag.
+    /// Unlike `use_polling`, this doesn't change if system forces polling.
+    pub user_requested_polling: bool,
 
     pub watcher_rx: Option<WatcherRx>,
     pub orphans: Vec<PathBuf>,
@@ -191,6 +195,7 @@ impl Observer {
             retry,
             follow,
             use_polling,
+            user_requested_polling: use_polling, // Store original user intent
             watcher_rx: None,
             orphans: Vec::new(),
             files,
