go-jsonnet native funtion callback

main.go

package main

import (
	"fmt"
	"log"

	"github.com/google/go-jsonnet"
	"github.com/google/go-jsonnet/ast"
)

func main() {
	vm := jsonnet.MakeVM()

	snippet := `std.native("gimme")("that") + {
		person1: {
		    name: "Alice",
		    welcome: "Hello " + self.name + "!",
		},
		person2: self.person1 { name: "Bob" },
	}`

	vm.NativeFunction(&jsonnet.NativeFunction{
		Name: "gimme",
		Func: func(args []interface{}) (interface{}, error) {
			return map[string]interface{}{"gimme": args[0]}, nil
		},
		Params: ast.Identifiers{"what"},
	})

	jsonStr, err := vm.EvaluateAnonymousSnippet("example1.jsonnet", snippet)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(jsonStr)
	/*
	   {
	     "gimme": "that",
	     "person1": {
	         "name": "Alice",
	         "welcome": "Hello Alice!"
	     },
	     "person2": {
	         "name": "Bob",
	         "welcome": "Hello Bob!"
	     }
	   }
	*/
}