package main

// This software is licensed for under the Free Software Foundations's GPL v2, as retrieved
// from https://opensource.org/licenses/gpl-2.0.php (2021).

import (
	"os"
	"io"
	"fmt"
	"golang.flu0r1ne.net/zsu/cmd"
)

const (
	VERSION = "0.0.1"
)

func printUsage(w io.Writer) {
	fmt.Fprintf (w, "usage: %s command args ...                   \n", os.Args[0])
	fmt.Fprintln(w, "  help                                                     ")
	fmt.Fprintln(w, "  version                                                  ")
	fmt.Fprintln(w, "  list [-paths|-p] <reference>                             ")
	fmt.Fprintln(w, "  diff <reference> <snap-ish>..<snap-ish>                 ")
	fmt.Fprintln(w, "  cat <reference> <snap-ish>                              ")
}

func dieUsage() {
	printUsage(os.Stderr)
	os.Exit(1)
}

func main() {

	if len(os.Args) < 2 {
	  dieUsage()
	}
  
	subcommand := os.Args[1]
	subargs := os.Args[2:]
  
	switch subcommand {
	  case "list":
		cmd.List(subargs)
	  case "version":
		fmt.Printf("%s\n", VERSION)
	  case "cat":
		cmd.Cat(subargs)
	  case "diff":
		cmd.Diff(subargs)
	  case "-h", "-help", "--help", "help":
		printUsage(os.Stdout)
	  default:
		fmt.Fprintf(os.Stderr, "unrecognized command %s\n", subcommand)
		dieUsage()
	}
  
}