viper-app/cmd/root.go

package cmd

import (
	"demo-server/cmd/inits"
	"os"

	"github.com/spf13/cobra"
)

var cfgFile string

// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
	Use:   "${cmd}",
	Short: "${cmd} example",
	Long: `${cmd} example
	use --config use config file to init app.
`,
	// Uncomment the following line if your bare application
	// has an action associated with it:
	Run: func(cmd *cobra.Command, args []string) {
		println("app say: no default opt， see help. ")
		_ = cmd.Help()
	},
}

// 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(func() {
		err := inits.InitFundamental()
		if err != nil {
			panic(err)
		}
	})

	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is ./conf/application.yaml)")
}