package main

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


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")
}