Bootstrapping Cobra Commands From a Config File

bootstrap.go

package cmd

import (
	"log"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

// Task tries to be similar to os.exec.Cmd
type Task struct {
	Name string
	Desc string
	Path string
	Args []string
}

type Config map[string]Task

var RootCmd = &cobra.Command{
	Use: "tool",
	Short: "Tool which bootstraps commands",
}

func Execute() {
	// intentionally left blank
}

func init() {
	cobra.OnInitialize(initConfig)
	RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "path to config file")
	
	err := RootCmd.Execute()
	if err != nil {
		// error handling
	}
}

func initConfig() {
	// omission: init viper, read config

	// iterate over parsed structures and create cobra.Commands
	tasks := Config{}
	err = viper.UnmarshalKey("tasks", &tasks)
	if err != nil {
		log.Fatalf("Could not unmarshal config: %+v", err)
	}

	log.Printf("Read tasks from config: %+v", tasks)
	for _, task := range tasks {
		log.Printf("Task found: %+v", task)
		var command = &cobra.Command{
			Use: task.Name,
			Short: task.Desc,
			Run: func(cmd *cobra.Command, args []string) {
				log.Printf("Executing %v", task.Name)
			},
		}
		RootCmd.AddCommand(command)
	}
}