Defaulted .ToStringE to use reflection to find a stringer element
diff --git a/caste.go b/caste.go
index 086a5b1..d639da7 100644
--- a/caste.go
+++ b/caste.go
@@ -119,6 +119,11 @@
}
}
+var (
+ errorType = reflect.TypeOf((*error)(nil)).Elem()
+ fmtStringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
+)
+
func ToStringE(i interface{}) (string, error) {
jww.DEBUG.Println("ToStringE called on type:", reflect.TypeOf(i))
@@ -136,7 +141,12 @@
case nil:
return "", nil
default:
- return "", fmt.Errorf("Unable to Cast %#v to string", i)
+ // shamelessly borrowed from html/template
+ v := reflect.ValueOf(i)
+ for !v.Type().Implements(fmtStringerType) && !v.Type().Implements(errorType) && v.Kind() == reflect.Ptr && !v.IsNil() {
+ v = v.Elem()
+ }
+ return fmt.Sprint(v), nil
}
}
