package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"strconv"
	"syscall"
)

func get_fileinfo(f string, size bool, mode bool, inode bool) string {
	var stat syscall.Stat_t
	var ret string
	ret = "{\"name\":\"" + f + "\""
	if err := syscall.Stat(f, &stat); err != nil {
		log.Fatal(err)
	}
	if size {
		ret = ret + ", \"size\":" + strconv.FormatInt(stat.Size, 10)
	}
	if mode {
		ret = ret + ", \"mode\":" + strconv.Itoa(int(stat.Mode))
	}
	if inode {
		ret = ret + ", \"inode\":" + strconv.FormatUint(stat.Ino, 10)
	}
	ret = ret + "}"
	return ret
}

func main() {
	// here be the ls flags

	var a_flag bool     // all files, even ones starting with .
	var mode_flag bool  // flags
	var inode_flag bool // inode
	var size_flag bool  // size
	var first = true

	flag.BoolVar(&a_flag, "a", false, "lists all files in directory, even hidden ones")
	flag.BoolVar(&mode_flag, "f", false, "include flags for file")
	flag.BoolVar(&inode_flag, "i", false, "include flags for file")
	flag.BoolVar(&size_flag, "s", false, "include flags for file")
	// end ls flag

	flag.Parse()
	root := "." //flag.Arg(0)
	dir, _ := ioutil.ReadDir(root)

	fmt.Printf("[\n")

	if !a_flag {
		for _, entry := range dir {
			if entry.Name()[0] != '.' {
				if !first {
					fmt.Printf(",")
				} else {
					first = false
				}
				fmt.Printf("%s\n", get_fileinfo(entry.Name(), size_flag, mode_flag, inode_flag))
			}
		}
	} else {
		for _, entry := range dir {
			if !first {
				fmt.Printf(",")
			} else {
				first = false
			}
			fmt.Printf("%s\n", get_fileinfo(entry.Name(), size_flag, mode_flag, inode_flag))
		}
	}
	fmt.Printf("]\n")
}