This fails when using commands. When type="existingfile" is under one command, all other commands fail. I would expect it to affect only that command.

Here's an albeit verbose example.

package main

import (
	"fmt"
	"github.com/alecthomas/kong"
)

var CLI struct {
	// Manage command
	Manage struct {
		Data      string `name:"data" group:"manage" default:"data" help:"Data directory for the files."`
		LoadFile1 string `name:"load-file1" group:"manage" required:"" type:"existingfile" default:"${data}/file1.txt" placeholder:"${data}/file1.txt" help:"Required file with existingfile type, has default."`
		LoadFile2 string `name:"load-file2" group:"manage" optional:"" type:"existingfile" placeholder:"${data}/file2.txt" help:"Optional file with existingfile type, no default."`
		LoadFile3 string `name:"load-file3" group:"manage" required:"" default:"${data}/file3.txt" placeholder:"${data}/file3.txt" help:"Required file without type, has default."`
		LoadFile4 string `name:"load-file4" group:"manage" required:"" type:"existingfile" placeholder:"${data}/file4.txt" help:"Required file with existingfile type, no default."`
	} `cmd:"" group:"manage" help:"Manage functions."`

	// Install command
	Install struct {
		Script string `name:"script" arg:"" help:"Script to install."`
		File1  string `name:"file" arg:"" help:"Existing file to install."`
	} `cmd:"" help:"Install functions."`

	// Download command
	Download struct {
		OS   string `name:"os" optional:"" default:"" help:"OS to download."`
		Arch string `name:"arch" optional:"" default:"" help:"Architecture to download."`
	} `cmd:"" help:"Download functions."`

	// Version
	Version struct {
	} `cmd:"" group:"version" name:"version" help:"Version information"`

	// License
	License struct {
	} `cmd:"" group:"license" name:"license" help:"License information"`
}

func main() {

	ctx := kong.Parse(&CLI,
		kong.Vars{
			"data": "data",
		},
	)
	switch ctx.Command() {
	case "manage":
		fmt.Println("Running manage command")

	case "install":
		fmt.Println("Running install command")

	case "download":
		fmt.Println("Running download command")

	case "version":
		fmt.Println("Running version command")

	case "license":
		fmt.Println("Running license command")

	default:
		_ = kong.DefaultHelpPrinter(kong.HelpOptions{}, ctx)
	}

}

kong-example --help works.

$ ./kong-example --help
Usage: kong-example <command>

Flags:
  -h, --help    Show context-sensitive help.

Commands:
  install <script> <file>
    Install functions.

  download
    Download functions.

manage
  manage --load-file1=${data}/file1.txt --load-file3=${data}/file3.txt --load-file4=${data}/file4.txt
    Manage functions.

version
  version
    Version information

license
  license
    License information

Run "kong-example <command> --help" for more information on a command.

All other commands fail.

$ ./kong-example install
kong-example: error: --load-file1: stat /home/user/Projects/kong-example/data/file1.txt: no such file or directory

$ ./kong-example download
kong-example: error: --load-file1: stat /home/user/Projects/kong-example/data/file1.txt: no such file or directory

$ ./kong-example version
kong-example: error: --load-file1: stat /home/user/Projects/kong-example/data/file1.txt: no such file or directory

$ ./kong-example license
kong-example: error: --load-file1: stat /home/user/Projects/kong-example/data/file1.txt: no such file or directory

Uh oh!

"existingfile"/"existingdir" always checks default value #26

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