multi-motors-controller/src/cmd/root.go

/*
Copyright © 2024 Antoine Harle antoine.harle@proton.me

*/
package cmd

import (
	"fmt"
	"os"

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

var cfgFile string

// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
	Use:   "src",
	Short: "Multi Motors Controller",
	Long: `Root command of Multi Motors Controller`,
	// Args: cobra.MinimumNArgs(1),
	// Uncomment the following line if your bare application
	// has an action associated with it:
	// Run: func(cmd *cobra.Command, args []string) { fmt.Println("root called with: ", viper.Get("motors")) },
}

// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the RootCmd.
func Execute() {
	err := RootCmd.Execute()
	if err != nil {
		os.Exit(1)
	}
}

func init() {
	cobra.OnInitialize(initConfig)

	// Here you will define your flags and configuration settings.
	// Cobra supports persistent flags, which, if defined here,
	// will be global for your application.

	RootCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c", "", "config file (default is $HOME/.cobra.yaml)")
	//RootCmd.MarkFlagRequired("config")
	// viper.BindPFlag("config", RootCmd.PersistentFlags().Lookup("config"))

	// Cobra also supports local flags, which will only run
	// when this action is called directly.
	RootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
	if cfgFile != "" {
		// viper.SetConfigType("yaml") // REQUIRED if the config file does not have the extension in the name
		// Use config file from the flag.
		viper.SetConfigFile(cfgFile)
	} else {
		// Find home directory.
		home, err := os.UserHomeDir()
		cobra.CheckErr(err)

		// Search config in home directory with name ".src" (without extension).
		viper.AddConfigPath(home)
		viper.SetConfigType("yaml")
		viper.SetConfigName(".src")
	}

	viper.AutomaticEnv() // read in environment variables that match

	// If a config file is found, read it in.
	if err := viper.ReadInConfig(); err == nil {
		fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
	} else {
		panic(fmt.Errorf("fatal error config file: %w", err))
		// if _, ok := err.(viper.ConfigFileNotFoundError); ok {
		// 	// Config file not found; ignore error if desired
		// } else {
		// 	// Config file was found but another error was produced
		// }
	}
}