CLI with viper config

Use Cobra for command parsing and Viper for configuration management to build a robust CLI.

package main

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

var rootCmd = &cobra.Command{
	Use:   "myapp",
	Short: "A brief description of your application",
	Run: func(cmd *cobra.Command, args []string) {
		// Access config via viper.Get("key")
	},
}

func init() {
	viper.SetConfigFile("config.yaml")
	viper.AutomaticEnv()
	if err := viper.ReadInConfig(); err == nil {
		// Config loaded
	}
	rootCmd.PersistentFlags().String("config", "", "config file path")
	_ = viper.BindPFlag("config", rootCmd.PersistentFlags().Lookup("config"))
}

func main() {
	if err := rootCmd.Execute(); err != nil {
		// Handle error
	}
}

Cobra handles the commands and flags your users type, while Viper manages the settings files and environment variables your app needs. Think of Cobra as the steering wheel that directs the car and Viper as the fuel tank that keeps it running. Together they let you build professional command-line tools without writing complex parsing logic.