printf using template vars... I found this a while back on stackoverflow or somewhere like that... original call is commented, just using an interface was more flexible for my uses

Tprintf.go

package util

import (
        "bytes"
        "text/template"
)

// Example:
// str := Tprintf("{{ .Thing }} a thing a do foo, bar", data)

// You may or may not want to change it to return or do more with any error

// Tprintf passed template string is formatted usign its operands and returns the resulting string.
// Spaces are added between operands when neither is a string.
//func Tprintf(tmpl string, data map[string]interface{}) string {
func Tprintf(tmpl string, data interface{}) string {
        t := template.Must(template.New("tprintf").Parse(tmpl))
        buf := &bytes.Buffer{}
        if err := t.Execute(buf, data); err != nil {
                return ""
        }
        return buf.String()
}