Add a configuration for additional_columns at the Resource level

pkg/config/config.go

@@ -74,6 +74,19 @@ type PrefixConfig struct {
 	StatusField string `json:"status_field,omitempty"`
 }
 
+// GetAdditionalColumns extracts AdditionalColumns defined for a given Resource
+func (c *Config) GetAdditionalColumns(resourceName string) []AdditionalColumnConfig {
+	if c == nil {
+		return []AdditionalColumnConfig{}
+	}
+
+	resourceConfig, ok := c.Resources[resourceName]
+	if !ok || resourceConfig.Print == nil || resourceConfig.Print.AdditionalColumns == nil {
+		return []AdditionalColumnConfig{}
+	}
+	return resourceConfig.Print.AdditionalColumns
+}
+
 // GetCustomListFieldMembers finds all of the custom list fields that need to
 // be generated as defined in the generator config.
 func (c *Config) GetCustomListFieldMembers() []string {

pkg/config/resource.go

@@ -317,6 +317,12 @@ type UpdateOperationConfig struct {
 	CustomMethodName string `json:"custom_method_name"`
 }
 
+type AdditionalColumnConfig struct {
+	Name string `json:"name"`
+	JSONPath string `json:"json_path"`
+	Type string `json:"type"`
+}
+
 // PrintConfig informs instruct the code generator on how to sort kubebuilder
 // printcolumn marker coments.
 type PrintConfig struct {
@@ -334,6 +340,10 @@ type PrintConfig struct {
 	AddSyncedColumn *bool `json:"add_synced_column"`
 	// OrderBy is the field used to sort the list of PrinterColumn options.
 	OrderBy string `json:"order_by"`
+
+	// AdditionalColumns can be used to add arbitrary extra columns to a Resource's output
+	// if present, should be a list of objects, each containing: name, json_path, and type
+	AdditionalColumns []AdditionalColumnConfig `json:"additional_columns,omitempty"`
 }
 
 // ReconcileConfig describes options for controlling the reconciliation

pkg/model/model.go

@@ -284,6 +284,16 @@ func (m *Model) GetCRDs() ([]*CRD, error) {
 			crd.AddStatusField(memberNames, memberShapeRef)
 		}
 
+		// Now add the additional printer columns that have been defined explicitly
+		// in additional_columns
+		for _, additionalColumn := range m.cfg.GetAdditionalColumns(crdName) {
+			printerColumn := &PrinterColumn{}
+			printerColumn.Name = additionalColumn.Name
+			printerColumn.JSONPath = additionalColumn.JSONPath
+			printerColumn.Type = additionalColumn.Type
+			crd.additionalPrinterColumns = append(crd.additionalPrinterColumns, printerColumn)
+		}
+
 		crds = append(crds, crd)
 	}
 	sort.Slice(crds, func(i, j int) bool {