envx

envs := [][2]string{
	{"EXAMPLE__ADDRESS", "asset://group/filename.png"},
	{"EXAMPLE__DATABASE_0", "mysql://u:p@host1:3306/db1?ssl=off"},
	{"EXAMPLE__DATABASE_1", "mysql://u:p@host2:3306/db2?ssl=off"},
	{"EXAMPLE__Endpoint", "http://username:password@localhost:8888/root?key=value1&key=value2"},
	{"EXAMPLE__Password", "password"},
	{"EXAMPLE__REDIS_instance1", "redis://u1:p1@host1:3306/1"},
	{"EXAMPLE__REDIS_instance2", "redis://u2:p2@host2:3306/2"},
}
for _, v := range envs {
	_ = os.Setenv(v[0], v[1])
}

defer func() {
	for _, v := range envs {
		_ = os.Unsetenv(v[0])
	}
}()

target := TestData{}

// read configurations from env vars and decode to target
dec := envx.NewDecoder(envx.ParseGroupFromEnv("EXAMPLE"))
must.NoError(dec.Decode(&target))

// encode target
grp := envx.NewGroup("EXAMPLE")
enc := envx.NewEncoder(grp)
must.NoError(enc.Encode(target))

// output dotenv raw and masked
fmt.Println(string(grp.Bytes()))
fmt.Println(string(grp.MaskBytes()))

Output:

EXAMPLE__ADDRESS=asset://group/filename.png
EXAMPLE__DATABASE_0=mysql://u:p@host1:3306/db1?ssl=off
EXAMPLE__DATABASE_1=mysql://u:p@host2:3306/db2?ssl=off
EXAMPLE__Endpoint=http://username:password@localhost:8888/root?key=value1&key=value2
EXAMPLE__NilPointer=0
EXAMPLE__Password=password
EXAMPLE__REDIS_instance1=redis://u1:p1@host1:3306/1
EXAMPLE__REDIS_instance2=redis://u2:p2@host2:3306/2

EXAMPLE__ADDRESS=asset://group/filename.png
EXAMPLE__DATABASE_0=mysql://u:--------@host1:3306/db1?ssl=off
EXAMPLE__DATABASE_1=mysql://u:--------@host2:3306/db2?ssl=off
EXAMPLE__Endpoint=http://username:--------@localhost:8888/root?key=value1&key=value2
EXAMPLE__NilPointer=0
EXAMPLE__Password=--------
EXAMPLE__REDIS_instance1=redis://u1:--------@host1:3306/1
EXAMPLE__REDIS_instance2=redis://u2:--------@host2:3306/2