package main

import (
  "fmt"
  "log"
  "os"

  "github.com/urfave/cli"
  "github.com/urfave/cli/altsrc"
)

var (
  test int
)

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

  flags := []cli.Flag{
    altsrc.NewIntFlag(cli.IntFlag{Name: "test,t", Destination: &test}),
    cli.StringFlag{Name: "load"},
  }

  app.Action = func(c *cli.Context) error {
    fmt.Printf("Have test value: %d\n", test)
    return nil
  }

  app.Before = altsrc.InitInputSourceWithContext(flags, altsrc.NewYamlSourceFromFlagFunc("load"))
  app.Flags = flags

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