make more use of generics

vendor/github.com/jesseduffield/generics/set/set.go

@@ -0,0 +1,49 @@
+package set
+
+import "github.com/jesseduffield/generics/hashmap"
+
+type Set[T comparable] struct {
+	hashMap map[T]bool
+}
+
+func New[T comparable]() *Set[T] {
+	return &Set[T]{hashMap: make(map[T]bool)}
+}
+
+func NewFromSlice[T comparable](slice []T) *Set[T] {
+	hashMap := make(map[T]bool)
+	for _, value := range slice {
+		hashMap[value] = true
+	}
+
+	return &Set[T]{hashMap: hashMap}
+}
+
+func (s *Set[T]) Add(value T) {
+	s.hashMap[value] = true
+}
+
+func (s *Set[T]) AddSlice(slice []T) {
+	for _, value := range slice {
+		s.Add(value)
+	}
+}
+
+func (s *Set[T]) Remove(value T) {
+	delete(s.hashMap, value)
+}
+
+func (s *Set[T]) RemoveSlice(slice []T) {
+	for _, value := range slice {
+		s.Remove(value)
+	}
+}
+
+func (s *Set[T]) Includes(value T) bool {
+	return s.hashMap[value]
+}
+
+// output slice is not necessarily in the same order that items were added
+func (s *Set[T]) ToSlice() []T {
+	return hashmap.Keys(s.hashMap)
+}