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// Package kingpin provides command line interfaces like this:
//
// $ chat
// usage: chat [<flags>] <command> [<flags>] [<args> ...]
//
// Flags:
// --debug enable debug mode
// --help Show help.
// --server=127.0.0.1 server address
//
// Commands:
// help <command>
// Show help for a command.
//
// post [<flags>] <channel>
// Post a message to a channel.
//
// register <nick> <name>
// Register a new user.
//
// $ chat help post
// usage: chat [<flags>] post [<flags>] <channel> [<text>]
//
// Post a message to a channel.
//
// Flags:
// --image=IMAGE image to post
//
// Args:
// <channel> channel to post to
// [<text>] text to post
// $ chat post --image=~/Downloads/owls.jpg pics
//
// From code like this:
//
// package main
//
// import "github.com/alecthomas/kingpin/v2"
//
// var (
// debug = kingpin.Flag("debug", "enable debug mode").Default("false").Bool()
// serverIP = kingpin.Flag("server", "server address").Default("127.0.0.1").IP()
//
// register = kingpin.Command("register", "Register a new user.")
// registerNick = register.Arg("nick", "nickname for user").Required().String()
// registerName = register.Arg("name", "name of user").Required().String()
//
// post = kingpin.Command("post", "Post a message to a channel.")
// postImage = post.Flag("image", "image to post").ExistingFile()
// postChannel = post.Arg("channel", "channel to post to").Required().String()
// postText = post.Arg("text", "text to post").String()
// )
//
// func main() {
// switch kingpin.Parse() {
// // Register user
// case "register":
// println(*registerNick)
//
// // Post message
// case "post":
// if *postImage != nil {
// }
// if *postText != "" {
// }
// }
// }
package kingpin