what`s wrong with 'iup.config' in iup package on lua - lua

Question

I started to learn lua (version 5.1) plus iup (version 3.5) library, but this issue shut me down :(
So, the clearest example from iup tutorial http://webserver2.tecgraf.puc-rio.br/iup/en/tutorial/tutorial3.html#Recent_Config
require("iuplua")
require("iupluaimglib")
--********************************** Utilities *****************************************
function str_find(str, str_to_find, casesensitive, start)
if (not casesensitive) then
return str_find(string.lower(str), string.lower(str_to_find), true, start)
end
return string.find(str, str_to_find, start, true)
end
function read_file(filename)
local ifile = io.open(filename, "r")
if (not ifile) then
iup.Message("Error", "Can't open file: " .. filename)
return nil
end
local str = ifile:read("*a")
if (not str) then
iup.Message("Error", "Fail when reading from file: " .. filename)
return nil
end
ifile:close()
return str
end
function write_file(filename, str)
local ifile = io.open(filename, "w")
if (not ifile) then
iup.Message("Error", "Can't open file: " .. filename)
return false
end
if (not ifile:write(str)) then
iup.Message("Error", "Fail when writing to file: " .. filename)
end
ifile:close()
return true
end
--********************************** Main (Part 1/2) *****************************************
-- it`s there:
config = iup.config{} ------ here it is, first error
config.app_name = "simple_notepad"
config:Load()
lbl_statusbar = iup.label{title = "Lin 1, Col 1", expand = "HORIZONTAL", padding = "10x5"}
multitext = iup.text{
multiline = "YES",
expand = "YES"
}
font = config:GetVariable("MainWindow", "Font")
if (font) then
multitext.font = font
end
item_open = iup.item{title = "&Open...\tCtrl+O"}
item_saveas = iup.item{title="Save &As...\tCtrl+S"}
item_font = iup.item{title="&Font..."}
item_about = iup.item{title="&About..."}
item_find = iup.item{title="&Find...\tCtrl+F"}
item_goto = iup.item{title="&Go To..."}
item_exit = iup.item{title="E&xit"}
--********************************** Callbacks *****************************************
function config:recent_cb()
local filename = self.title
local str = read_file(filename)
if (str) then
multitext.value = str
end
end
function multitext:caret_cb(lin, col)
lbl_statusbar.title = "Lin "..lin..", Col "..col
end
function item_open:action()
local filedlg = iup.filedlg{
dialogtype = "OPEN",
filter = "*.txt",
filterinfo = "Text Files",
parentdialog=iup.GetDialog(self)
}
filedlg:popup(iup.CENTERPARENT, iup.CENTERPARENT)
if (tonumber(filedlg.status) ~= -1) then
local filename = filedlg.value
local str = read_file(filename)
if (str) then
config:RecentUpdate(filename)
multitext.value = str
end
end
filedlg:destroy()
end
function item_saveas:action()
local filedlg = iup.filedlg{
dialogtype = "SAVE",
filter = "*.txt",
filterinfo = "Text Files",
parentdialog=iup.GetDialog(self)
}
filedlg:popup(iup.CENTERPARENT, iup.CENTERPARENT)
if (tonumber(filedlg.status) ~= -1) then
local filename = filedlg.value
if (write_file(filename, multitext.value)) then
config:RecentUpdate(filename)
end
end
filedlg:destroy()
end
function item_exit:action()
config:DialogClosed(iup.GetDialog(self), "MainWindow")
config:Save()
config:destroy()
return iup.CLOSE
end
function item_goto:action()
local line_count = multitext.linecount
local lbl_goto = iup.label{title = "Line Number [1-"..line_count.."]:"}
local txt_goto = iup.text{mask = iup.MASK_UINT, visiblecolumns = 20} --unsigned integer numbers only
local bt_goto_ok = iup.button{title = "OK", text_linecount = 0, padding = "10x2"}
bt_goto_ok.text_linecount = line_count
function bt_goto_ok:action()
local line_count = tonumber(self.text_linecount)
local line = tonumber(txt_goto.value)
if (line < 1 or line >= line_count) then
iup.Message("Error", "Invalid line number.")
return
end
goto_dlg.status = 1
return iup.CLOSE
end
local bt_goto_cancel = iup.button{title = "Cancel", padding = "10x2"}
function bt_goto_cancel:action()
goto_dlg.status = 0
return iup.CLOSE
end
local box = iup.vbox{
lbl_goto,
txt_goto,
iup.hbox{
iup.fill{},
bt_goto_ok,
bt_goto_cancel,
normalizesize="HORIZONTAL",
},
margin = "10x10",
gap = "5",
}
goto_dlg = iup.dialog{
box,
title = "Go To Line",
dialogframe = "Yes",
defaultenter = bt_goto_ok,
defaultesc = bt_goto_cancel,
parentdialog = iup.GetDialog(self)
}
goto_dlg:popup(iup.CENTERPARENT, iup.CENTERPARENT)
if (tonumber(goto_dlg.status) == 1) then
local line = txt_goto.value
local pos = iup.TextConvertLinColToPos(multitext, line, 0)
multitext.caretpos = pos
multitext.scrolltopos = pos
end
goto_dlg:destroy()
end
function item_find:action()
local find_dlg = self.find_dialog
if (not find_dlg) then
local find_txt = iup.text{visiblecolumns = "20"}
local find_case = iup.toggle{title = "Case Sensitive"}
local bt_find_next = iup.button{title = "Find Next", padding = "10x2"}
local bt_find_close = iup.button{title = "Close", padding = "10x2"}
function bt_find_next:action()
local find_pos = tonumber(find_dlg.find_pos)
local str_to_find = find_txt.value
local casesensitive = (find_case.value == "ON")
-- test again, because it can be called from the hot key
if (not str_to_find or str_to_find:len()==0) then
return
end
if (not find_pos) then
find_pos = 1
end
local str = multitext.value
local pos, end_pos = str_find(str, str_to_find, casesensitive, find_pos)
if (not pos) then
pos, end_pos = str_find(str, str_to_find, casesensitive, 1) -- try again from the start
end
if (pos) and (pos > 0) then
pos = pos - 1
find_dlg.find_pos = end_pos
iup.SetFocus(multitext)
multitext.selectionpos = pos..":"..end_pos
local lin, col = iup.TextConvertPosToLinCol(multitext, pos)
local pos = iup.TextConvertLinColToPos(multitext, lin, 0) -- position at col=0, just scroll lines
multitext.scrolltopos = pos
else
find_dlg.find_pos = nil
iup.Message("Warning", "Text not found.")
end
end
function bt_find_close:action()
iup.Hide(iup.GetDialog(self)) -- do not destroy, just hide
end
box = iup.vbox{
iup.label{title = "Find What:"},
find_txt,
find_case,
iup.hbox{
iup.fill{},
bt_find_next,
bt_find_close,
normalizesize="HORIZONTAL",
},
margin = "10x10",
gap = "5",
}
find_dlg = iup.dialog{
box,
title = "Find",
dialogframe = "Yes",
defaultenter = bt_next,
defaultesc = bt_close,
parentdialog = iup.GetDialog(self)
}
-- Save the dialog to reuse it
self.find_dialog = find_dlg -- from the main dialog */
end
-- centerparent first time, next time reuse the last position
find_dlg:showxy(iup.CURRENT, iup.CURRENT)
end
function item_font:action()
local font = multitext.font
local fontdlg = iup.fontdlg{value = font, parentdialog=iup.GetDialog(self)}
fontdlg:popup(iup.CENTERPARENT, iup.CENTERPARENT)
if (tonumber(fontdlg.status) == 1) then
multitext.font = fontdlg.value
config:SetVariable("MainWindow", "Font", fontdlg.value)
end
fontdlg:destroy()
end
function item_about:action()
iup.Message("About", " Simple Notepad\n\nAutors:\n Gustavo Lyrio\n Antonio Scuri")
end
--********************************** Main (Part 2/2) *****************************************
recent_menu = iup.menu{}
file_menu = iup.menu{
item_open,
item_saveas,
iup.separator{},
iup.submenu{title="Recent &Files", recent_menu},
item_exit
}
edit_menu = iup.menu{item_find, item_goto}
format_menu = iup.menu{item_font}
help_menu = iup.menu{item_about}
sub_menu_file = iup.submenu{file_menu, title = "&File"}
sub_menu_edit = iup.submenu{edit_menu, title = "&Edit"}
sub_menu_format = iup.submenu{format_menu, title = "F&ormat"}
sub_menu_help = iup.submenu{help_menu, title = "&Help"}
menu = iup.menu{
sub_menu_file,
sub_menu_edit,
sub_menu_format,
sub_menu_help,
}
btn_open = iup.button{image = "IUP_FileOpen", flat = "Yes", action = item_open.action, canfocus="No", tip = "Open (Ctrl+O)"}
btn_save = iup.button{image = "IUP_FileSave", flat = "Yes", action = item_saveas.action, canfocus="No", tip = "Save (Ctrl+S)"}
btn_find = iup.button{image = "IUP_EditFind", flat = "Yes", action = item_find.action, canfocus="No", tip = "Find (Ctrl+F)"}
toolbar_hb = iup.hbox{
btn_open,
btn_save,
iup.label{separator="VERTICAL"},
btn_find,
margin = "5x5",
gap = 2,
}
vbox = iup.vbox{
toolbar_hb,
multitext,
lbl_statusbar,
}
dlg = iup.dialog{
vbox,
title = "Simple Notepad",
size = "HALFxHALF",
menu = menu,
close_cb = item_exit.action,
}
function dlg:k_any(c)
if (c == iup.K_cO) then
item_open:action()
elseif (c == iup.K_cS) then
item_saveas:action()
elseif (c == iup.K_cF) then
item_find:action()
elseif (c == iup.K_cG) then
item_goto:action()
end
end
config:RecentInit(recent_menu, 10)
-- parent for pre-defined dialogs in closed functions (IupMessage)
iup.SetGlobal("PARENTDIALOG", iup.SetHandleName(dlg))
config:DialogShow(dlg, "MainWindow")
-- to be able to run this script inside another context
if (iup.MainLoopLevel()==0) then
iup.MainLoop()
iup.Close()
end
don`t working:
error output:
wlua: source.wlua:52: attempt to call field 'config' (a nil value)
So, why it isn`t working?