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1 ## Copyright (C) 1996, 1997 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 2, or (at your option) |
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8 ## 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, write to the Free |
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} menu (@var{title}, @var{opt1}, @dots{}) |
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22 ## Print a title string followed by a series of options. Each option will |
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23 ## be printed along with a number. The return value is the number of the |
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24 ## option selected by the user. This function is useful for interactive |
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25 ## programs. There is no limit to the number of options that may be passed |
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26 ## in, but it may be confusing to present more than will fit easily on one |
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27 ## screen. |
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28 ## @end deftypefn |
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29 ## @seealso{disp, printf, and input} |
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30 |
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31 ## Author: jwe |
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32 |
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33 function num = menu (t, ...) |
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34 |
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35 if (nargin < 2) |
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36 usage ("menu (title, opt1, ...)"); |
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37 endif |
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38 |
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39 ## Force pending output to appear before the menu. |
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40 |
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41 fflush (stdout); |
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42 |
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43 ## Don't send the menu through the pager since doing that can cause |
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44 ## major confusion. |
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45 |
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46 save_page_screen_output = page_screen_output; |
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47 |
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48 unwind_protect |
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49 |
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50 page_screen_output = 0; |
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51 |
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52 if (! isempty (t)) |
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53 disp (t); |
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54 printf ("\n"); |
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55 endif |
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56 |
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57 nopt = nargin - 1; |
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58 |
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59 while (1) |
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60 va_start (); |
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61 for i = 1:nopt |
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62 printf (" [%2d] ", i); |
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63 disp (va_arg ()); |
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64 endfor |
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65 printf ("\n"); |
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66 s = input ("pick a number, any number: ", "s"); |
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67 eval (sprintf ("num = %s;", s), "num = [];"); |
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68 if (! is_scalar (num) || num < 1 || num > nopt) |
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69 printf ("\nerror: input invalid or out of range\n\n"); |
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70 else |
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71 break; |
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72 endif |
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73 endwhile |
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74 |
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75 unwind_protect_cleanup |
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76 |
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77 page_screen_output = save_page_screen_output; |
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78 |
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79 end_unwind_protect |
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80 |
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81 endfunction |
