z3ntl3.com/autoenv

AutoEnv

Dynamically interpolate placeholder variables in any config file. Made especially to be a plugin for Viper.

Features

• Very easy to use
• Deep interpolation/substitution of variables
• Works with Viper
• Elegant
• Ability to change the left/right delimiters for convenience How?

Installation

go get z3ntl3.com/autoenv

After that

You can just import it in your project and use it.

package main

import "z3ntl3.com/autoenv"

Example

Let's consider the following as a .env file:

NAME="z3ntl3"
DOMAIN="com"

WEBSITE="{NAME}.{DOMAIN}"

And this code:

package main

import (
	"fmt"
	"log"

	"github.com/spf13/viper"
	"z3ntl3.com/autoenv/pkg/autoenv"
)

func main(){
    viper.AddConfigPath("../tests")

	// viper.AutomaticEnv()
	viper.SetConfigName("test")
	viper.SetConfigType("env")

	if err := viper.ReadInConfig(); err != nil {
		log.Fatal(err)
	}

	autoenv.New().Execute() // interpolates all the placeholder variables
	fmt.Println(viper.GetString("WEBSITE")) // see the change
}

Output

WEBSITE="{NAME}.{DOMAIN}" turns into z3ntl3.com.

How to change delimiters

Have this example ENV

NAME="z3ntl3"
DOMAIN="com"

WEBSITE="<NAME>.<DOMAIN>"

And this code:

package main

import (
	"fmt"
	"log"

	"github.com/spf13/viper"
	"z3ntl3.com/autoenv/pkg/autoenv"
)

func main() {
	viper.AddConfigPath("../../tests")

	// viper.AutomaticEnv()
	viper.SetConfigName("test2")
	viper.SetConfigType("env")

	if err := viper.ReadInConfig(); err != nil {
		log.Fatal(err)
	}

	autoenv.New().SetDelim("<", ">").Execute() // interpolates all the placeholder variables with the delims
	fmt.Println(viper.GetString("WEBSITE")) // see the change
}

Output

WEBSITE="<NAME>.<DOMAIN>" turns into z3ntl3.com.

License

GNU GPLv3