How to load multiple configuration values bound to pflags at once?

[kostrahb]

I have golang application that uses viper and pflags and takes a lot of different flags. It binds them to certain location in viper configuration structure (in the minimal example it's asdf) and then loads all the values at once (for now I am fine with map[string]string, but potentially it might be also map[string]interface{}). The aim is to merge them with some other configuration and pass all the values to templating engine.

However I seem to be unable to load that map because viper.Get("asdf") returns nil instead of expected map. You can find minimal example below. Am I missing some steps that needs to be done in order to get the configuration? How can I load all the configuration at once?

package main

import (
	"fmt"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var (
	RootCmd = &cobra.Command{
		Use:   "asdf",
		Short: "asdf",
		Run: func(cmd *cobra.Command, args []string) {
			fmt.Println(viper.Get("asdf")) // I expect map[string]interface{a: "a", b: "b"}, but I get <nil> instead
			fmt.Println(viper.Get("asdf.a")) // This returns the value correctly as "a"
		},
	}
)

func init() {
	// set defaults
	RootCmd.PersistentFlags().String("a", "a", "a")
	RootCmd.PersistentFlags().String("b", "b", "b")

	// bind flags to certain location
	viper.BindPFlag("asdf.a", RootCmd.PersistentFlags().Lookup("a"))
	viper.BindPFlag("asdf.b", RootCmd.PersistentFlags().Lookup("b"))

	viper.Debug()
}

func main() {
	RootCmd.Execute()
}

[kostrahb]

Ok, from what I understood, pflags are saved separately in a map that has keys with addresses. And because no special lookup structure is used, viper simply does not know about these values when it tries to get parent keys.
I found pretty evil workaround that will get values to the standard config "tree":

package main

import (
	"fmt"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var (
	RootCmd = &cobra.Command{
		Use:   "asdf",
		Short: "asdf",
		Run: func(cmd *cobra.Command, args []string) {
			viper.Set("asdf.a", viper.Get("asdf.a"))
			viper.Set("asdf.b", viper.Get("asdf.b"))
			fmt.Println(viper.Get("asdf"))
			fmt.Println(viper.Get("asdf.a"))
		},
	}
)

func init() {
	// set defaults
	RootCmd.PersistentFlags().String("a", "a", "a")

	RootCmd.PersistentFlags().String("b", "b", "b")

	viper.BindPFlag("asdf.a", RootCmd.PersistentFlags().Lookup("a"))
	viper.BindPFlag("asdf.b", RootCmd.PersistentFlags().Lookup("b"))

	viper.Debug()
}

func main() {
	RootCmd.Execute()
}