Merge pull request #35 from yue9944882/printer-example

Adding example for custom printers

internal/example/v1alpha1/example.go

@@ -17,9 +17,12 @@ limitations under the License.
 package v1alpha1
 
 import (
+	"context"
+
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
+	"sigs.k8s.io/apiserver-runtime/pkg/builder/resource/resourcestrategy"
 )
 
 type ExampleResource struct {
@@ -67,3 +70,38 @@ func (e *ExampleResourceList) DeepCopyObject() runtime.Object {
 	// implemented by code generation
 	return e
 }
+
+var _ resourcestrategy.TableConverter = &ExampleResource{}
+var _ resourcestrategy.TableConverter = &ExampleResourceList{}
+
+var (
+	definitions = []metav1.TableColumnDefinition{
+		{Name: "Name", Type: "string", Format: "name", Description: "the name of the cluster"},
+	}
+)
+
+func (in *ExampleResource) ConvertToTable(ctx context.Context, tableOptions runtime.Object) (*metav1.Table, error) {
+	return &metav1.Table{
+		ColumnDefinitions: definitions,
+		Rows:              []metav1.TableRow{printResource(in)},
+	}, nil
+}
+
+func (in *ExampleResourceList) ConvertToTable(ctx context.Context, tableOptions runtime.Object) (*metav1.Table, error) {
+	t := &metav1.Table{
+		ColumnDefinitions: definitions,
+	}
+	for _, c := range in.Items {
+		t.Rows = append(t.Rows, printResource(&c))
+	}
+	return t, nil
+}
+
+func printResource(c *ExampleResource) metav1.TableRow {
+	name := c.Name
+	row := metav1.TableRow{
+		Object: runtime.RawExtension{Object: c},
+	}
+	row.Cells = append(row.Cells, name)
+	return row
+}