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annotate scripts/miscellaneous/menu.m @ 14138:72c96de7a403 stable

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maint: update copyright notices for 2012
author John W. Eaton <jwe@octave.org>
date Mon, 02 Jan 2012 14:25:41 -0500
parents acaf33ccc04f
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14138
72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1993-2012 John W. Eaton
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} menu (@var{title}, @var{opt1}, @dots{})
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21 ## Print a title string followed by a series of options. Each option will
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22 ## be printed along with a number. The return value is the number of the
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23 ## option selected by the user. This function is useful for interactive
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24 ## programs. There is no limit to the number of options that may be passed
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25 ## in, but it may be confusing to present more than will fit easily on one
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26 ## screen.
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27 ## @seealso{disp, printf, input}
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28 ## @end deftypefn
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30 ## Author: jwe
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31
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32 function num = menu (title, varargin)
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34 if (nargin < 2)
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35 print_usage ();
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36 endif
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37
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38 ## Force pending output to appear before the menu.
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40 fflush (stdout);
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42 ## Don't send the menu through the pager since doing that can cause
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43 ## major confusion.
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44
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45 page_screen_output (0, "local");
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47 if (! isempty (title))
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48 disp (title);
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49 printf ("\n");
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50 endif
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51
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52 nopt = nargin - 1;
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54 while (1)
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55 for i = 1:nopt
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56 printf (" [%2d] ", i);
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57 disp (varargin{i});
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58 endfor
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59 printf ("\n");
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60 s = input ("pick a number, any number: ", "s");
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61 num = sscanf (s, "%d");
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62 if (! isscalar (num) || num < 1 || num > nopt)
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63 printf ("\nerror: input invalid or out of range\n\n");
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64 else
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65 break;
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66 endif
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67 endwhile
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69 endfunction
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