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## Copyright (C) 1996 John W. Eaton
##
## 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 2, 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, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## usage: menu (title, opt1, ...)
##
## See also: disp, printf, input
## Author: jwe
function num = menu (t, ...)
if (nargin < 2)
usage ("menu (title, opt1, ...)");
endif
## Force pending output to appear before the menu.
fflush (stdout);
## Don't send the menu through the pager since doing that can cause
## major confusion.
save_page_screen_output = page_screen_output;
unwind_protect
page_screen_output = 0;
if (! isempty (t))
disp (t);
printf ("\n");
endif
nopt = nargin - 1;
while (1)
va_start ();
for i = 1:nopt
printf (" [%2d] ", i);
disp (va_arg ());
endfor
printf ("\n");
s = "";
s = input ("pick a number, any number: ", "s");
if (strcmp (s, ""))
printf ("\n");
continue;
endif
eval (sprintf ("num = %s;", s));
if (! is_scalar (num) || num < 1 || num > nopt)
printf ("\nerror: input invalid or out of range\n\n");
else
break;
endif
endwhile
unwind_protect_cleanup
page_screen_output = save_page_screen_output;
end_unwind_protect
endfunction
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