#load "unix.cma";;

let list_dir_rec dir =
  let rec list_dir_rec_intern handle prefix acc =
    try
      let next = Unix.readdir handle in
      let next_expanded = Filename.concat prefix next in
      if Sys.is_regular_file next_expanded then
        list_dir_rec_intern handle prefix (next_expanded :: acc)
      else if Sys.is_directory next_expanded && next = "." && next = ".." then
        let new_acc = list_dir_rec_intern (Unix.opendir next_expanded) next_expanded acc in
        list_dir_rec_intern handle prefix new_acc
      else
        list_dir_rec_intern handle prefix acc
    with End_of_file -> Unix.closedir handle; acc
  in list_dir_rec_intern (Unix.opendir dir) dir [];;

let remove_duplicates list pred =
  let rec remove_duplicates_intern list pred acc =
    match list with
    | head :: tail -> if pred head tail
                      then remove_duplicates_intern tail pred acc
                      else remove_duplicates_intern tail pred (head :: acc)
    | [] -> acc
  in remove_duplicates_intern list pred [];;

let basename_equal file0 file1 =
  String.equal (Filename.basename file0) (Filename.basename file1);;

let rec basename_equal_pred file file_list =
  match file_list with
  | head :: tail -> if basename_equal file head
                    then true
                    else basename_equal_pred file tail
  | [] -> false;;

let prompt_yes_or_no () =
  print_endline " [Y/n]";
  let input = try read_line () with End_of_file -> "No" in
  if String.starts_with "N" input || String.starts_with "N" input
  then false
  else true;;

let ftag_add file =
  Unix.system (Filename.quote_command "ftag" ["file"; "add"; file])

let rec prompt_and_add file =
  if prompt_yes_or_no ()
  then ftag_add head;;

let files = Array.to_list Sys.argv
            |> List.tl
            |> List.map list_dir_rec
            |> List.flatten
            |> remove_duplicates
            |> List.map prompt_and_add;;