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update doc w/ newer cmd/root.go example (#973)

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Joshua Harshman 2019-10-07 15:31:10 -06:00 committed by GitHub
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README.md
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@ -210,33 +210,52 @@ You will additionally define flags and handle configuration in your init() funct
For example cmd/root.go: For example cmd/root.go:
```go ```go
package cmd
import ( import (
"fmt" "fmt"
"os"
homedir "github.com/mitchellh/go-homedir" homedir "github.com/mitchellh/go-homedir"
"github.com/spf13/cobra" "github.com/spf13/cobra"
"github.com/spf13/viper" "github.com/spf13/viper"
) )
var cfgFile string var (
// Used for flags.
cfgFile string
userLicense string
rootCmd = &cobra.Command{
Use: "cobra",
Short: "A generator for Cobra based Applications",
Long: `Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
}
)
// Execute executes the root command.
func Execute() error {
return rootCmd.Execute()
}
func init() { func init() {
cobra.OnInitialize(initConfig) cobra.OnInitialize(initConfig)
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)") rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)")
rootCmd.PersistentFlags().StringVarP(&projectBase, "projectbase", "b", "", "base project directory eg. github.com/spf13/") rootCmd.PersistentFlags().StringP("author", "a", "YOUR NAME", "author name for copyright attribution")
rootCmd.PersistentFlags().StringP("author", "a", "YOUR NAME", "Author name for copyright attribution") rootCmd.PersistentFlags().StringVarP(&userLicense, "license", "l", "", "name of license for the project")
rootCmd.PersistentFlags().StringVarP(&userLicense, "license", "l", "", "Name of license for the project (can provide `licensetext` in config)") rootCmd.PersistentFlags().Bool("viper", true, "use Viper for configuration")
rootCmd.PersistentFlags().Bool("viper", true, "Use Viper for configuration")
viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author")) viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
viper.BindPFlag("projectbase", rootCmd.PersistentFlags().Lookup("projectbase"))
viper.BindPFlag("useViper", rootCmd.PersistentFlags().Lookup("viper")) viper.BindPFlag("useViper", rootCmd.PersistentFlags().Lookup("viper"))
viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>") viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>")
viper.SetDefault("license", "apache") viper.SetDefault("license", "apache")
rootCmd.AddCommand(addCmd)
rootCmd.AddCommand(initCmd)
} }
func initConfig() { func initConfig() {
// Don't forget to read config either from cfgFile or from home directory!
if cfgFile != "" { if cfgFile != "" {
// Use config file from the flag. // Use config file from the flag.
viper.SetConfigFile(cfgFile) viper.SetConfigFile(cfgFile)
@ -244,8 +263,7 @@ func initConfig() {
// Find home directory. // Find home directory.
home, err := homedir.Dir() home, err := homedir.Dir()
if err != nil { if err != nil {
fmt.Println(err) er(err)
os.Exit(1)
} }
// Search config in home directory with name ".cobra" (without extension). // Search config in home directory with name ".cobra" (without extension).
@ -253,9 +271,10 @@ func initConfig() {
viper.SetConfigName(".cobra") viper.SetConfigName(".cobra")
} }
if err := viper.ReadInConfig(); err != nil { viper.AutomaticEnv()
fmt.Println("Can't read config:", err)
os.Exit(1) if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
} }
} }
``` ```