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update doc w/ newer cmd/root.go example (#973)
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1 changed files with 56 additions and 37 deletions
93
README.md
93
README.md
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@ -210,53 +210,72 @@ You will additionally define flags and handle configuration in your init() funct
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For example cmd/root.go:
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```go
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import (
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"fmt"
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"os"
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package cmd
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homedir "github.com/mitchellh/go-homedir"
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"github.com/spf13/cobra"
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"github.com/spf13/viper"
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import (
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"fmt"
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homedir "github.com/mitchellh/go-homedir"
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"github.com/spf13/cobra"
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"github.com/spf13/viper"
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)
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var cfgFile string
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var (
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// Used for flags.
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cfgFile string
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userLicense string
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rootCmd = &cobra.Command{
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Use: "cobra",
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Short: "A generator for Cobra based Applications",
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Long: `Cobra is a CLI library for Go that empowers applications.
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This application is a tool to generate the needed files
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to quickly create a Cobra application.`,
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}
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)
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// Execute executes the root command.
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func Execute() error {
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return rootCmd.Execute()
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}
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func init() {
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cobra.OnInitialize(initConfig)
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rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)")
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rootCmd.PersistentFlags().StringVarP(&projectBase, "projectbase", "b", "", "base project directory eg. github.com/spf13/")
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rootCmd.PersistentFlags().StringP("author", "a", "YOUR NAME", "Author name for copyright attribution")
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rootCmd.PersistentFlags().StringVarP(&userLicense, "license", "l", "", "Name of license for the project (can provide `licensetext` in config)")
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rootCmd.PersistentFlags().Bool("viper", true, "Use Viper for configuration")
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viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
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viper.BindPFlag("projectbase", rootCmd.PersistentFlags().Lookup("projectbase"))
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viper.BindPFlag("useViper", rootCmd.PersistentFlags().Lookup("viper"))
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viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>")
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viper.SetDefault("license", "apache")
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cobra.OnInitialize(initConfig)
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rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)")
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rootCmd.PersistentFlags().StringP("author", "a", "YOUR NAME", "author name for copyright attribution")
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rootCmd.PersistentFlags().StringVarP(&userLicense, "license", "l", "", "name of license for the project")
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rootCmd.PersistentFlags().Bool("viper", true, "use Viper for configuration")
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viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
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viper.BindPFlag("useViper", rootCmd.PersistentFlags().Lookup("viper"))
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viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>")
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viper.SetDefault("license", "apache")
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rootCmd.AddCommand(addCmd)
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rootCmd.AddCommand(initCmd)
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}
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func initConfig() {
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// Don't forget to read config either from cfgFile or from home directory!
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if cfgFile != "" {
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// Use config file from the flag.
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viper.SetConfigFile(cfgFile)
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} else {
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// Find home directory.
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home, err := homedir.Dir()
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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if cfgFile != "" {
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// Use config file from the flag.
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viper.SetConfigFile(cfgFile)
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} else {
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// Find home directory.
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home, err := homedir.Dir()
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if err != nil {
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er(err)
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}
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// Search config in home directory with name ".cobra" (without extension).
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viper.AddConfigPath(home)
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viper.SetConfigName(".cobra")
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}
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// Search config in home directory with name ".cobra" (without extension).
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viper.AddConfigPath(home)
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viper.SetConfigName(".cobra")
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}
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if err := viper.ReadInConfig(); err != nil {
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fmt.Println("Can't read config:", err)
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os.Exit(1)
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}
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viper.AutomaticEnv()
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if err := viper.ReadInConfig(); err == nil {
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fmt.Println("Using config file:", viper.ConfigFileUsed())
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}
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}
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```
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