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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
-