Add GVR extensions template for instantiating with a resource name

Sources/SwiftkubeModelGen/ModelGen.swift

@@ -72,6 +72,7 @@ struct ModelGen: ParsableCommand {
 			RenderTemplate(environment: environment, template: GroupVersionKindResourceNameTemplate()),
 			RenderTemplate(environment: environment, template: GroupVersionKindDefaultResourcesTemplate()),
 			RenderTemplate(environment: environment, template: GroupVersionKindAPIResourceTemplate()),
+			RenderTemplate(environment: environment, template: GroupVersionResourceResourceNameTemplate()),
 			RenderTemplate(environment: environment, template: GroupVersionResourceAPIResourceTemplate()),
 			RenderTemplate(environment: environment, template: GroupVersionResourceDefaultResourcesTemplate()),
 			RenderTemplate(environment: environment, template: AnyKubernetesAPIResourceTemplate()),

Sources/SwiftkubeModelGen/Template/Templates.swift

@@ -44,6 +44,15 @@ struct GroupVersionKindAPIResourceTemplate: TemplateType {
 	}
 }
 
+struct GroupVersionResourceResourceNameTemplate: TemplateType {
+
+	let stencilTemplate = "GroupVersionResource+ResourceName.swift.stencil"
+
+	func destination(basePath: Path) -> Path {
+		basePath + Path("GroupVersionResource+ResourceName.swift")
+	}
+}
+
 struct GroupVersionResourceAPIResourceTemplate: TemplateType {
 
 	let stencilTemplate = "GroupVersionResource+KubernetesAPIResource.swift.stencil"

templates/model/GroupVersionResource+ResourceName.swift.stencil

@@ -0,0 +1,81 @@
+//
+// Copyright 2020 Swiftkube Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+///
+/// Generated by Swiftkube:ModelGen
+/// Kubernetes {{meta.modelVersion}}
+///
+
+import Foundation
+
+extension GroupVersionResource {
+
+	/// Creates a new instance of `GroupVersionResource` for the provided resource name.
+	///
+	/// A resource name can be:
+	/// - Lower-cased singular resource kind
+	/// - Lower-cased plural resource name
+	/// - Lower-cased short resource name
+	///
+	/// ```swift
+	/// let gvk = GroupVersionResource(for: "deployment")
+	/// let gvk = GroupVersionResource(for: "deployments")
+	/// let gvk = GroupVersionResource(for: "deploy")
+	/// ```
+	///
+	/// - Parameter resourceName: The resource plural or singular name or its kind.
+	public init?(for resourceName: String) {
+		if let gvk = GroupVersionResource.tryKind(resourceName) {
+			self = gvk
+		} else if let gvk = GroupVersionResource.tryPlural(resourceName) {
+			self = gvk
+		} else if let gvk = GroupVersionResource.tryShort(resourceName) {
+			self = gvk
+		} else {
+			return nil
+		}
+	}
+
+	private static func tryKind(_ kind: String) -> GroupVersionResource? {
+		switch kind.lowercased() {
+{% for gvk in newestGroupVersionKinds %}
+		case "{{ gvk|GVK.kind|lowercase }}":
+			return GroupVersionResource(group: "{{ gvk|GVK.group }}", version: "{{ gvk|GVK.version }}", resource: "{{ gvk|GVK.plural }}"){% endfor %}
+		default:
+			return nil
+		}
+	}
+
+	private static func tryPlural(_ plural: String) -> GroupVersionResource? {
+		switch plural {
+{% for gvk in pluralGroupVersionKinds %}
+		case "{{ gvk|GVK.plural }}":
+			return GroupVersionResource(group: "{{ gvk|GVK.group }}", version: "{{ gvk|GVK.version }}", resource: "{{ gvk|GVK.plural }}"){% endfor %}
+		default:
+			return nil
+		}
+	}
+
+	private static func tryShort(_ short: String) -> GroupVersionResource? {
+		switch short {
+{% for gvk in shortGroupVersionKinds %}
+		case {{ gvk|GVK.short }}:
+			return GroupVersionResource(group: "{{ gvk|GVK.group }}", version: "{{ gvk|GVK.version }}", resource: "{{ gvk|GVK.plural }}"){% endfor %}
+		default:
+			return nil
+		}
+	}
+}