Support standalone mode for framework functions

kyaml/fn/framework/example2/main.go

@@ -0,0 +1,35 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"text/template"
+
+	"sigs.k8s.io/kustomize/kyaml/fn/framework"
+)
+
+func main() {
+	type api struct {
+		Key   string `json:"key" yaml:"key"`
+		Value string `json:"value" yaml:"value"`
+	}
+	cmd := framework.TemplateCommand{
+		API: &api{},
+		Template: template.Must(template.New("example").Parse(`
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: foo
+  namespace: default
+  annotations:
+    {{ .Key }}: {{ .Value }}
+`)),
+	}.GetCommand()
+	if err := cmd.Execute(); err != nil {
+		fmt.Fprintln(cmd.OutOrStderr(), err)
+		os.Exit(1)
+	}
+}