(* $Id$ *)

open Tk

(* Listboxes *)

let update_hooks = ref []

let add_update_hook f = update_hooks := f :: !update_hooks

let exec_update_hooks () =
    update_hooks := List.filter !update_hooks pred:
      begin fun f ->
      	try f (); true
      	with Protocol.TkError _ -> false
      end

let set_load_path l =
    Config.load_path := l;
    exec_update_hooks ()

let get_load_path () = !Config.load_path

let renew_dirs box :var :dir =
  Textvariable.set var to:dir;
  Listbox.delete box first:(`Num 0) last:`End;
  Listbox.insert box index:`End
    texts:(Useunix.get_directories_in_files path:dir
      	       	 (Useunix.get_files_in_directory dir));
  Jg_box.recenter box index:(`Num 0)

let renew_path box =
  Listbox.delete box first:(`Num 0) last:`End;
  Listbox.insert box index:`End texts:!Config.load_path;
  Jg_box.recenter box index:(`Num 0)

let add_to_path :dirs ?:base{=""} box =
  let dirs =
    if base = "" then dirs else
    if dirs = [] then [base] else
    List.map dirs fun:
      begin function
	  "." -> base 
	| ".." -> Filename.dirname base
	| x -> base ^ "/" ^ x
      end
  in
  set_load_path
    (dirs @ List.fold_left dirs acc:(get_load_path ())
      	      fun:(fun :acc x -> List2.exclude elt:x acc))

let remove_path box :dirs =
  set_load_path
    (List.fold_left dirs acc:(get_load_path ())
       fun:(fun :acc x -> List2.exclude elt:x acc))

(* main function *)

let f :dir =
  let current_dir = ref dir in
  let tl = Jg_toplevel.titled "Edit Load Path" in
  Jg_bind.escape_destroy tl;
  let var_dir = Textvariable.create on:tl () in
  let caplab = Label.create parent:tl text:"Path" ()
  and dir_name =
      Entry.create parent:tl textvariable:var_dir ()
  and browse = Frame.create parent:tl () in
  let dirs = Frame.create parent:browse ()
  and path = Frame.create parent:browse () in
  let dirframe, dirbox, dirsb = Jg_box.create_with_scrollbar parent:dirs ()
  and pathframe, pathbox, pathsb = Jg_box.create_with_scrollbar parent:path ()
  in
  add_update_hook (fun () -> renew_path pathbox);
  Listbox.configure pathbox width:40 selectmode:`Multiple;
  Listbox.configure dirbox selectmode:`Multiple;
  Jg_box.add_completion dirbox action:
    begin fun index ->
      begin match Listbox.get dirbox :index with
	"." -> ()
      | ".." -> current_dir := Filename.dirname !current_dir
      | x -> current_dir := !current_dir ^ "/" ^ x
      end;
      renew_dirs dirbox var:var_dir dir:!current_dir;
      Listbox.selection_clear dirbox first:(`Num 0) last:`End
    end;
  Jg_box.add_completion pathbox action:
    begin fun index ->
      current_dir := Listbox.get pathbox :index;
      renew_dirs dirbox var:var_dir dir:!current_dir
    end;

  bind dir_name events:[[],`KeyPressDetail"Return"]
    action:(`Set([], fun _ ->
      let dir = Textvariable.get var_dir in
      if Useunix.is_directory dir then begin
	current_dir := dir;
	renew_dirs dirbox var:var_dir :dir
      end));

  let bind_space_toggle lb =
    bind lb events:[[], `KeyPressDetail "space"]
    action:(`Extend ([], fun _ -> ()))
  in bind_space_toggle dirbox; bind_space_toggle pathbox;
  
  let add_paths _ =
    add_to_path pathbox base:!current_dir
      dirs:(List.map (Listbox.curselection dirbox)
      	      fun:(fun x -> Listbox.get dirbox index:x));
    Listbox.selection_clear dirbox first:(`Num 0) last:`End
  and remove_paths _ =
    remove_path pathbox
      dirs:(List.map (Listbox.curselection pathbox)
      	      fun:(fun x -> Listbox.get pathbox index:x))
  in
  bind dirbox events:[[], `KeyPressDetail "Insert"]
    action:(`Set ([], add_paths));
  bind pathbox events:[[], `KeyPressDetail "Delete"]
    action:(`Set ([], remove_paths));
  
  let dirlab = Label.create parent:dirs text:"Directories" ()
  and pathlab = Label.create parent:path text:"Load path" ()
  and addbutton =
    Button.create parent:dirs text:"Add to path" command:add_paths ()
  and pathbuttons = Frame.create parent:path () in
  let removebutton =
    Button.create parent:pathbuttons text:"Remove from path"
      command:remove_paths ()
  and ok =
    Jg_button.create_destroyer tl parent:pathbuttons
  in
  renew_dirs dirbox var:var_dir dir:!current_dir;
  renew_path pathbox;
  pack [dirsb] side:`Right fill:`Y;
  pack [dirbox] side:`Left fill:`Y expand:true;
  pack [pathsb] side:`Right fill:`Y;
  pack [pathbox] side:`Left fill:`Both expand:true;
  pack [dirlab] side:`Top anchor:`W padx:(`Pix 10);
  pack [addbutton] side:`Bottom fill:`X;
  pack [dirframe] fill:`Y expand:true;
  pack [pathlab] side:`Top anchor:`W padx:(`Pix 10);
  pack [removebutton; ok] side:`Left fill:`X expand:true;
  pack [pathbuttons] fill:`X side:`Bottom;
  pack [pathframe] fill:`Both expand:true;
  pack [dirs] side:`Left fill:`Y;
  pack [path] side:`Right fill:`Both expand:true;
  pack [caplab] side:`Top anchor:`W padx:(`Pix 10);
  pack [dir_name] side:`Top anchor:`W fill:`X;
  pack [browse] side:`Bottom expand:true fill:`Both;
  tl