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 || len(resourceConfig.Print.AdditionalColumns) == 0 {
+		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 +317,22 @@ type UpdateOperationConfig struct {
 	CustomMethodName string `json:"custom_method_name"`
 }
 
+// AdditionalConfig can be used to specify additional printer columns to be included
+// in a Resource's output from kubectl
+type AdditionalColumnConfig struct {
+	// the name to display in the column's output
+	Name string `json:"name"`
+	// the JSONPath definining the source of the output
+	JSONPath string `json:"json_path"`
+	// the OpenAPI type of the output
+	// c.f., https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#data-types
+	Type string `json:"type"`
+	// the priority of the column in the resource's output
+	Priority int `json:"priority,omitempty"`
+	// the zero-based index of the position at which to display the column in output
+	Index int `json:"index,omitempty"`
+}
+
 // PrintConfig informs instruct the code generator on how to sort kubebuilder
 // printcolumn marker coments.
 type PrintConfig struct {
@@ -334,6 +350,10 @@ 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/crd.go

@@ -566,6 +566,20 @@ func (r *CRD) PrintSyncedColumn() bool {
 	return r.cfg.ResourceDisplaysSyncedColumn(r.Names.Camel)
 }
 
+func (r *CRD) setAdditionalPrinterColumns(additionalColumns []*ackgenconfig.AdditionalColumnConfig) {
+	r.additionalPrinterColumns = []*PrinterColumn{}
+
+	for _, additionalColumn := range additionalColumns {
+		printerColumn := &PrinterColumn{}
+		printerColumn.Name = additionalColumn.Name
+		printerColumn.JSONPath = additionalColumn.JSONPath
+		printerColumn.Type = additionalColumn.Type
+		printerColumn.Priority = additionalColumn.Priority
+		printerColumn.Index = additionalColumn.Index
+		r.additionalPrinterColumns = append(r.additionalPrinterColumns, printerColumn)
+	}
+}
+
 // ReconcileRequeuOnSuccessSeconds returns the duration after which to requeue
 // the custom resource as int
 func (r *CRD) ReconcileRequeuOnSuccessSeconds() int {

pkg/model/model.go

@@ -284,6 +284,10 @@ func (m *Model) GetCRDs() ([]*CRD, error) {
 			crd.AddStatusField(memberNames, memberShapeRef)
 		}
 
+		// Now add the additional printer columns that have been defined explicitly
+		// in additional_columns
+		crd.setAdditionalPrinterColumns(m.cfg.GetAdditionalColumns(crdName))
+
 		crds = append(crds, crd)
 	}
 	sort.Slice(crds, func(i, j int) bool {