envflagset

type EnvFlagSet struct {
	// FlagSet defines flag.FlagSet to operate on. If not provided, flag.CommandLine will be used.
	FlagSet *flag.FlagSet

	// Prefix defines environment variable prefix to use
	Prefix string

	// MinLength defines minimal flag name length to use in mapping.
	MinLength int

	// Map defines custom flag name to environment variable mappings. Prefix or MinLength are not taken into account.
	Map map[string]string

	// UpdateUsage switches environment variable names in usage message.
	UpdateUsage bool

	// Env defines environment lookup method. If not defined, syscall environment lookup will be used which is probably
	// the best option for the majority of use cases.
	Env EnvGetter
	// contains filtered or unexported fields
}

type EnvGetter interface {
	GetEnv(string) (string, bool)
}