init: pristine aerc 0.20.0 source

lib/watchers/watchers.go

@@ -0,0 +1,44 @@
+package watchers
+
+import (
+	"fmt"
+	"runtime"
+)
+
+// FSWatcher is a file system watcher
+type FSWatcher interface {
+	Configure(string) error
+	Events() chan *FSEvent
+	// Adds a directory or file to the watcher
+	Add(string) error
+	// Removes a directory or file from the watcher
+	Remove(string) error
+}
+
+type FSOperation int
+
+const (
+	FSCreate FSOperation = iota
+	FSRemove
+	FSRename
+)
+
+type FSEvent struct {
+	Operation FSOperation
+	Path      string
+}
+
+type WatcherFactoryFunc func() (FSWatcher, error)
+
+var watcherFactory WatcherFactoryFunc
+
+func RegisterWatcherFactory(fn WatcherFactoryFunc) {
+	watcherFactory = fn
+}
+
+func NewWatcher() (FSWatcher, error) {
+	if watcherFactory == nil {
+		return nil, fmt.Errorf("Unsupported OS: %s", runtime.GOOS)
+	}
+	return watcherFactory()
+}