#go-figure 
go-figure is a multi-file, multi-configuration package configuration to handle old-school configuration techniques such searching for as multiple files in multiple folders (~/something.d, /etc/something.d, ...).
It does expand standard shell parameters in the path list via os.ExpandEnv().
#Usage
Generally the following should be done:
...
v := viper.New()
v.SetConfigType("yml|json|yaml")
gofigure.Parse(v, []string{"${HOME}/.app.d", "${CFGD}", "/etc/app.d"})
...
//do something with v