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Pointer structs not created with env prefixes #234

@mrsimonemms

Description

@mrsimonemms

Following the issue raised in #202, if a pointer struct is used then the default object is not created - this is different to a non-pointer object. See the following example:

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"os"

	"github.com/caarlos0/env/v6"
)

type Test struct {
	Str string `env:"TEST"`
}
type ComplexConfig struct {
	Foo   *Test `envPrefix:"FOO_"`
	Bar   Test  `envPrefix:"BAR_"`
	Clean *Test
}

func main() {
	os.Setenv("FOO_TEST", "kek")
	os.Setenv("BAR_TEST", "lel")

	cfg := ComplexConfig{}
	err := env.Parse(&cfg)
	if err != nil {
		log.Fatal(err)
	}
	confBytes, _ := json.Marshal(cfg)
	fmt.Printf("%s", confBytes)
}

This results in:

{"Foo":null,"Bar":{"Str":"lel"},"Clean":null}

Notice how Foo is null, but Bar has the object created.

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