爲什麼眼鏡蛇不能讀取我的配置文件

Question

眼鏡蛇和毒蛇的文檔令我困惑。我做了cobra init fooproject，然後在項目目錄中我做了cobra add bar。我有一個名爲foo的PersistentFlag，這裏是root命令的init函數。

func Execute() { 
    if err := RootCmd.Execute(); err != nil { 
     fmt.Println(err) 
     os.Exit(-1) 
    } 

    fmt.Println(cfgFile) 
    fmt.Println("fooString is: ", fooString) 
} 


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().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.fooproject.yaml)") 
    RootCmd.PersistentFlags().StringVar(&fooString, "foo", "", "loaded from config") 

    viper.BindPFlag("foo", RootCmd.PersistentFlags().Lookup("foo")) 
    // 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") 
} 

我的配置文件看起來像這樣...

--- 
foo: aFooString 

，當我打電話go run main.go我看到這個...

A longer description that spans multiple lines and likely contains 
examples and usage of using your application. For example: 

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. 

Usage: 
    fooproject [command] 

Available Commands: 
    bar   A brief description of your command 
    help  Help about any command 

Flags: 
     --config string config file (default is $HOME/.fooproject.yaml) 
     --foo string  loaded from config 
    -h, --help   help for fooproject 
    -t, --toggle   Help message for toggle 

Use "fooproject [command] --help" for more information about a command. 

fooString is: 

當我打電話go run main.go bar我看到這個.. 。

Using config file: my/gopath/github.com/user/fooproject/.fooproject.yaml 
bar called 

fooString is: 

所以它使用的是配置文件，但它們中的一個似乎都沒有讀它，也許我誤解了眼鏡蛇和毒蛇的工作方式，有什麼想法？

Answer 1

要結合spf13/cobra和spf13/viper，

首先定義與眼鏡蛇的標誌：與毒蛇

RootCmd.PersistentFlags().StringP("foo", "", "loaded from config") 

將其綁定：

viper.BindPFlag("foo", RootCmd.PersistentFlags().Lookup("foo")) 

，並通過Viper的方法得到的變量：

fmt.Println("fooString is: ", viper.GetString("foo"))