One plugin per dir.

plugin/someteam.example.com/v1/someservicegenerator/SomeServiceGenerator.go

@@ -0,0 +1,53 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package main
+
+import (
+	"bytes"
+	"text/template"
+
+	"sigs.k8s.io/kustomize/k8sdeps/kunstruct"
+	"sigs.k8s.io/kustomize/pkg/ifc"
+	"sigs.k8s.io/kustomize/pkg/resmap"
+	"sigs.k8s.io/kustomize/pkg/resource"
+	"sigs.k8s.io/yaml"
+)
+
+// A simple generator example.  Makes one service.
+type plugin struct {
+	Name string `json:"name,omitempty" yaml:"name,omitempty"`
+	Port string `json:"port,omitempty" yaml:"port,omitempty"`
+}
+
+var KustomizePlugin plugin
+
+const tmpl = `
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: dev
+  name: {{.Name}}
+spec:
+  ports:
+  - port: {{.Port}}
+  selector:
+    app: dev
+`
+
+func (p *plugin) Config(
+	ldr ifc.Loader, rf *resmap.Factory, config []byte) error {
+	return yaml.Unmarshal(config, p)
+}
+
+func (p *plugin) Generate() (resmap.ResMap, error) {
+	var buf bytes.Buffer
+	temp := template.Must(template.New("tmpl").Parse(tmpl))
+	err := temp.Execute(&buf, p)
+	if err != nil {
+		return nil, err
+	}
+	rf := resmap.NewFactory(resource.NewFactory(kunstruct.NewKunstructuredFactoryImpl()))
+	return rf.NewResMapFromBytes(buf.Bytes())
+}

plugin/someteam.example.com/v1/someservicegenerator/SomeServiceGenerator_test.go

@@ -0,0 +1,43 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package main_test
+
+import (
+	"testing"
+
+	"sigs.k8s.io/kustomize/pkg/kusttest"
+	"sigs.k8s.io/kustomize/plugin"
+)
+
+func TestSomeServiceGeneratorPlugin(t *testing.T) {
+	tc := plugin.NewEnvForTest(t).Set()
+	defer tc.Reset()
+
+	tc.BuildGoPlugin(
+		"someteam.example.com", "v1", "SomeServiceGenerator")
+
+	th := kusttest_test.NewKustTestPluginHarness(t, "/app")
+
+	m := th.LoadAndRunGenerator(`
+apiVersion: someteam.example.com/v1
+kind: SomeServiceGenerator
+metadata:
+  name: myGenerator
+name: my-service
+port: "12345"
+`)
+	th.AssertActualEqualsExpected(m, `
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: dev
+  name: my-service
+spec:
+  ports:
+  - port: 12345
+  selector:
+    app: dev
+`)
+}