how to embed function like require

[lazytiger]

For multiple script files, a require function will be nice, but I have tried and failed.

func require(fn otto.FunctionCall) otto.Value {
file := fn.Argument(0).String()
fmt.Printf("require file:%s\n", file)
data, err := ioutil.ReadFile(file)
if err != nil {
fmt.Println(err)
panic(err)
}

_, err = fn.Otto.Run(string(data))
fmt.Println(string(data))
if err != nil {
    fmt.Println(err)
    panic(err)
}

return otto.TrueValue()

}
engine := otto.New()
engine.Set("require", require)

[robertkrimen]

You probably want something like this:

package main

import (
    "fmt"
    Otto "github.com/robertkrimen/otto"
    "io/ioutil"
)

func main() {
    otto := Otto.New()
    otto.Set("require", require)
    otto.Run(`
        require("test.js");
        test();
    `)
}

func require(call Otto.FunctionCall) Otto.Value {
    file := call.Argument(0).String()
    fmt.Printf("requiring: %s\n", file)
    data, err := ioutil.ReadFile(file)
    if err != nil {
        fmt.Println(err)
        panic(err)
    }
    _, err = call.Otto.Run(string(data))
    fmt.Println(string(data))
    if err != nil {
        fmt.Println(err)
        panic(err)
    }
    return Otto.TrueValue()
}

I'm not sure if it's a bug that Run does not always run in the global context or not...

[robertkrimen]

And here is test.js:

var global = Function('return this')();

global.test = function() {
    console.log("Hello, World.");
};

[ddliu]

I've created a package named motto to provide a Nodejs like module environment, hope it helpful.