README.md

viper-template

An extension for Golang Viper library to use and execute Go templates in the viper configs.

Usage

package main

import (
	"fmt"
	"text/template"

	"github.com/spf13/viper"
	vipertemplate "github.com/sv-tools/viper-template"
)

func main() {
	v := viper.New()
	v.Set("foo", `{{ Get "bar" }}`)
	v.Set("bar", `{{ Mul . 2 }}`)

	type Data struct {
		Bar int
	}
	data := Data{
		Bar: 42,
	}

	funcs := template.FuncMap{
		"Mul": func(d *Data, v int) int {
			return d.Bar * v
		},
	}

	val, err := vipertemplate.Get(
		"foo",
		vipertemplate.WithViper(v),
		vipertemplate.WithData(&data),
		vipertemplate.WithFuncs(funcs),
	)
	if err != nil {
		panic(err)
	}

	fmt.Println(val)
	// Output: 84
}

Benchmarks

v1.5.0

using go v1.21.3

goos: darwin
goarch: arm64
pkg: github.com/sv-tools/viper-template
BenchmarkGetParallel-8            807338              1510 ns/op            4329 B/op         43 allocs/op
BenchmarkGetSequential-8          431893              2716 ns/op            4327 B/op         43 allocs/op