feat(Type): add new function to be able to recover from panics when unwrapping a none/error value

type/utils.go

@@ -1,5 +1,11 @@
 package Type
 
+import (
+	"fmt"
+	"reflect"
+	"unsafe"
+)
+
 func Expect[T any](val Unwrappable[T], msg string) T {
 	return val.Expect(msg)
 }
@@ -42,3 +48,92 @@ func ResultWrapb[T any](err error, val T) Result[T] {
 func Ptr[T any](v T) *T {
 	return &v
 }
+
+// meant to be used as defer Type.CatchUnwrap(Type.Ptr(&res)) or Type.CatchUnwrap(&res) if res is already a pointer
+// where res is a pointer to an Option or Result returned by a function (initialized to not be nil)
+// func X() (res *Optional[int]) {
+// 	res = None[int]()
+// 	defer CatchUnwrap(&res)
+//
+//  // Some possibly unsafe unwrapping of values
+//  return res
+// }
+// === OR ===
+// func X() (res Optional[int]) {
+// 	res = None[int]()
+//  defer Type.CatchUnwrap(Type.Ptr(&res))
+//
+//  // Some possibly unsafe unwrapping of values
+//  return res
+// }
+
+func CatchUnwrap(ret interface{}) {
+	r := recover()
+	if r == nil {
+		return
+	}
+	vp := reflect.ValueOf(r)
+	if vp.Kind() != reflect.Pointer || vp.IsNil() {
+		panic(r)
+	}
+
+	if _, ok := r.(OptionalerMarker); ok {
+		if setOptionalNone(ret) {
+			return
+		}
+	}
+
+	if _, ok := r.(ResulterMarker); ok {
+		if setResultError(ret, fmt.Errorf("Tried to unwrap a failed result!")) {
+			return
+		}
+	}
+
+	panic(r)
+}
+
+func setOptionalNone(ret interface{}) bool {
+	v := reflect.ValueOf(ret)
+	if v.Kind() != reflect.Ptr || v.IsNil() {
+		return false
+	}
+	elem := v.Elem().Elem()
+	if elem.Kind() != reflect.Struct {
+		return false
+	}
+	presentField := elem.FieldByName("present")
+	if !presentField.IsValid() {
+		return false
+	}
+	if presentField.Kind() == reflect.Bool {
+		presentField = reflect.NewAt(presentField.Type(),
+			unsafe.Pointer(presentField.UnsafeAddr())).Elem()
+		presentField.SetBool(false) // Setting it to false (None)
+	} else {
+		return false
+	}
+	return true
+}
+
+func setResultError(ret interface{}, err error) bool {
+	v := reflect.ValueOf(ret)
+	if v.Kind() != reflect.Ptr || v.IsNil() {
+		return false
+	}
+	elem := v.Elem().Elem()
+	if elem.Kind() != reflect.Struct {
+		return false
+	}
+	errField := elem.FieldByName("err")
+	if !errField.IsValid() {
+		return false
+	}
+	if errField.Kind() == reflect.Interface {
+		errField = reflect.NewAt(errField.Type(),
+			unsafe.Pointer(errField.UnsafeAddr())).Elem()
+		errField.Set(reflect.ValueOf(err)) // Setting the error
+	} else {
+		return false
+	}
+	return true
+}