Powerful Command-Line Applications in Go

Using Viper for Configuration Management

When you use the Cobra generator to create the boilerplate code for your application, it automatically enables Viper. Viper is a configuration management solution for Go applications which allows you to specify configuration options for your application in several ways, including configuration files, environment variables, and command-line flags.

Cobra enables Viper by running the function initConfig when initializing the application. This function is defined in the cmd/root.go file:

cobra/pScan.v6/cmd/root.go

func initConfig() {
  if cfgFile != "" {
    // Use config file from the flag.
    viper.SetConfigFile(cfgFile)
  } else {
    // Find home directory.
    home, err := homedir.Dir()
    if err ...