feat: allow selection for files to be encoded in a directory

util.go

@@ -0,0 +1,43 @@
+package main
+
+func contains[T comparable](slice []T, elem T) bool {
+	for _, e := range slice {
+		if e == elem {
+			return true
+		}
+	}
+
+	return false
+}
+
+func every[T any](slice []T, pred func(elem T) bool) bool {
+	for _, e := range slice {
+		if !pred(e) {
+			return false
+		}
+	}
+
+	return true
+}
+
+func anyOf[T any](slice []T, pred func(elem T) bool) bool {
+	for _, e := range slice {
+		if pred(e) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func filter[T any](slice []T, pred func(elem T) bool) []T {
+	filtered := make([]T, 0)
+
+	for _, e := range slice {
+		if pred(e) {
+			filtered = append(filtered, e)
+		}
+	}
+
+	return filtered
+}