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inotify.Watcher wraps Linux inotify for config reloads and app-list updates. Poll getFd() next to your Wayland socket and timer FDs. 
const inotify = @import("otter_utils").inotify;

var watcher = try inotify.Watcher.init(allocator);
defer watcher.deinit();

_ = try watcher.addWatch("/path/to/file", inotify.Watcher.Mask.file_changes);
_ = try watcher.addWatch("/path/to/dir", inotify.Watcher.Mask.dir_changes);

// After poll reports readability:
while (watcher.nextEvent()) |event| {
    if (event.isModified()) { /* reload */ }
    if (event.isCreated()) { /* rescan dir */ }
}

​
Event helpers

MethodMeaning
isModified()File written and closed
isDeleted()File removed
isCreated()New file in watched directory
isMoved()Rename or move
isIgnored()Watch removed (file deleted or unmount)
otter-conf and otter-desktop both use this wrapper. Prefer importing from otter_utils in app code unless you need otter-conf’s path-indexed watcher.