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## Copyright (C) 2010, 2013 Martin Hepperle
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{h} =} helpdlg (@var{msg})
## @deftypefnx {Function File} {@var{h} =} helpdlg (@var{msg}, @var{title})
## Display @var{msg} in a help dialog box.
##
## The message may have multiple lines separated by newline characters
## ("\n"), or it may be a cellstr array with one element for each
## line. The optional input @var{title} (character string) can be used to
## set the dialog caption. The default title is @qcode{"Help Dialog"}.
##
## The return value is always 1.
## @seealso{errordlg, inputdlg, listdlg, msgbox, questdlg, warndlg}
## @end deftypefn
function retval = helpdlg (msg, title = "Help Dialog")
if (nargin < 1 || nargin > 2)
print_usage ();
endif
retval = message_dialog ("helpdlg", msg, title, "help");
endfunction
%!demo
%! disp ('- test helpdlg with a help message only.');
%! helpdlg ("Below, you should see 3 lines:\nline #1\nline #2, and\nline #3.");
%!demo
%! disp ('- test helpdlg with help message and caption.');
%! helpdlg ('You should see a single line.','A help dialog');
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