main.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"

	"github.com/urfave/cli"
	"gopkg.in/yaml.v2"
)

// Note: struct fields must be public in order for unmarshal to
// correctly populate the data.
type Glue struct {
	Command string
}

func main() {
	app := cli.NewApp()

	b, err := ioutil.ReadFile("glue.yml") // just pass the file name
	if err != nil {
		fmt.Print(err)
	}

	m := make(map[interface{}]interface{})

	err = yaml.Unmarshal(b, &m)
	if err != nil {
		log.Fatalf("error: %v", err)
	}

	commands := make([]cli.Command, 0)
	for k, v := range m {
		commands = append(commands, cli.Command{
			Name: k.(string),
			Action: func(c *cli.Context) error {
				fmt.Print(v)
				return nil
			},
		})
	}
	app.Commands = commands

	err = app.Run(os.Args)
	if err != nil {
		log.Fatal(err)
	}
}