example using [pongo2](https://github.com/flosch/pongo2)

example.j2

Hello, {{ name }}

main.go

package main

import (
    "bufio"
    "os"

    "github.com/flosch/pongo2"
)

var exampleTpl = pongo2.Must(pongo2.FromFile("example.j2"))

func main() {
    outFilename := "example.txt"
    ctx := pongo2.Context{
        "name": "John",
    }
    err := executeTemplateToFile(exampleTpl, ctx, outFilename)
    if err != nil {
        panic(err)
    }
}

func executeTemplateToFile(tpl *pongo2.Template, ctx pongo2.Context, fn string) error {
    file, err := os.Create(fn)
    if err != nil {
        return err
    }
    defer file.Close()

    writer := bufio.NewWriter(file)
    err = tpl.ExecuteWriter(ctx, writer)
    if err != nil {
        return err
    }
    return writer.Flush()
}