Option to require env vars to be set and not empty by default

[arvenil]

It looks like there is no way to require env vars to be set and not empty by default?

https://go.dev/play/p/fiRtVlFW3if

package main

import (
	"fmt"

	"github.com/caarlos0/env/v10"
)

func main() {
	type Config struct {
		Username string `env:"EX_USERNAME" envDefault:"admin"`
		Password string `env:"EX_PASSWORD"`
	}

	var cfg Config
	if err := env.ParseWithOptions(&cfg, env.Options{
		Environment: map[string]string{
			"EX_USERNAME": "https://google.com",
			"EX_PASSWORD": "",
		},
		RequiredIfNoDef: true,
	}); err != nil {
		fmt.Println(err)
	}

	fmt.Printf("%+v\n", cfg)
}

Results in

{Username:https://google.com Password:}

Program exited.

[caarlos0]

you can append ,notEmpty to the env name, e.g.:

	type Config struct {
		Username string `env:"EX_USERNAME" envDefault:"admin"`
		Password string `env:"EX_PASSWORD,notEmpty"`
	}

https://pkg.go.dev/github.com/caarlos0/env/v11#example-Parse-NotEmpty

[arvenil]

Yes, but that forces us to remember to append it to every field. We tend to forget set the value and program instead of failing on initialization often fails when the value is finally needed. The idea is the same as RequiredIfNoDef but extended to empty variables.