komega: add package global functions

allows to use it in a similar way to Gomega

pkg/envtest/komega/default.go

@@ -0,0 +1,57 @@
+package komega
+
+import (
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+// Default is the Komega used by the package global functions.
+// NOTE: Replace it with a custom instance or use WithDefaultClient.
+//       Otherwise the package global functions will panic.
+var Default Komega = &komega{}
+
+// WithDefaultClient replaces the default Komega with a new one that uses the given client.
+func WithDefaultClient(c client.Client) {
+	Default = &komega{client: c}
+}
+
+func checkDefaultClient() {
+	if Default.(*komega).client == nil {
+		panic("Default Komega's client is not set. Use WithDefaultClient to set it.")
+	}
+}
+
+// Get fetches an object until the forwarded error matches.
+func Get(obj client.Object) func() error {
+	checkDefaultClient()
+	return Default.Get(obj)
+}
+
+// List fetches a list until the forwarded error matches.
+func List(obj client.ObjectList, opts ...client.ListOption) func() error {
+	checkDefaultClient()
+	return Default.List(obj, opts...)
+}
+
+// Update tries to update an object by applying the updateFunc until the forwarded error matches.
+func Update(obj client.Object, f UpdateFunc, opts ...client.UpdateOption) func() error {
+	checkDefaultClient()
+	return Default.Update(obj, f, opts...)
+}
+
+// UpdateStatus tries to update an object's status by applying the updateFunc until the forwarded error matches.
+func UpdateStatus(obj client.Object, f UpdateFunc, opts ...client.UpdateOption) func() error {
+	checkDefaultClient()
+	return Default.UpdateStatus(obj, f, opts...)
+}
+
+// Object
+func Object(obj client.Object) func() client.Object {
+	checkDefaultClient()
+	return Default.Object(obj)
+}
+
+// ObjectList
+func ObjectList(obj client.ObjectList, opts ...client.ListOption) func() client.ObjectList {
+	checkDefaultClient()
+	return Default.ObjectList(obj, opts...)
+}