cobra/viper root.go template

main.go

package main

import (
        "github.com/dwburke/xxxx/cmd"
)

func main() {
        cmd.Execute()
}

root.go

package cmd

import (
    "fmt"
    "os"

    homedir "github.com/mitchellh/go-homedir"
    "github.com/spf13/cobra"
    "github.com/spf13/viper"
)

var cfgFile string

func init() {
    cobra.OnInitialize(initConfig)
    rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)")
}

var rootCmd = &cobra.Command{
    Use:   "dburke-things",
    Short: "dburke-things is a thing",
    Long:  `Love me`,
    Run: func(cmd *cobra.Command, args []string) {
        cmd.Usage()
    },
}

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

func initConfig() {
    // Don't forget to read config either from cfgFile or from home directory!
    if cfgFile != "" {
        // Use config file from the flag.
        viper.SetConfigFile(cfgFile)
    } else {
        // Find home directory.
        home, err := homedir.Dir()
        if err != nil {
            fmt.Println(err)
            os.Exit(1)
        }

        // Search config in home directory with name ".cobra" (without extension).
        viper.AddConfigPath(home)
        viper.AddConfigPath("./")
        viper.SetConfigName(".dburke-things")
    }

    if err := viper.ReadInConfig(); err != nil {
        fmt.Fprintf(os.Stderr, "Unable to load config file, using defaults.\n")
        //fmt.Println("Can't read config:", err)
        //os.Exit(1)
    }
}

tweaked version of the cobra example... just have to change references of 'dburke-things' to suit your app, and decide if you want a failure to read the config at the bottom to be fatal or use your defaults (ymmv)