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1 ### Copyright (C) 1996 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 function num = menu (t, ...) |
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21 |
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22 ## usage: menu (title, opt1, ...) |
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23 ## |
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24 ## See also: disp, printf, input |
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25 |
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26 if (nargin < 2) |
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27 usage ("menu (title, opt1, ...)"); |
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28 endif |
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29 |
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30 ## Force pending output to appear before the menu. |
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31 |
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32 fflush (stdout); |
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33 |
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34 ## Don't send the menu through the pager since doing that can cause |
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35 ## major confusion. |
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36 |
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37 save_page_screen_output = page_screen_output; |
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38 |
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39 unwind_protect |
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40 |
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41 page_screen_output = "false"; |
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42 |
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43 if (! isempty (t)) |
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44 disp (t); |
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45 printf ("\n"); |
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46 endif |
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47 |
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48 nopt = nargin - 1; |
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49 |
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50 while (1) |
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51 va_start (); |
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52 for i = 1:nopt |
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53 printf (" [%2d] ", i); |
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54 disp (va_arg ()); |
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55 endfor |
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56 printf ("\n"); |
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57 s = ""; |
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58 s = input ("pick a number, any number: ", "s"); |
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59 if (strcmp (s, "")) |
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60 printf ("\n"); |
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61 continue; |
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62 endif |
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63 eval (sprintf ("num = %s;", s)); |
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64 if (! is_scalar (num) || num < 1 || num > nopt) |
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65 printf ("\nerror: input invalid or out of range\n\n"); |
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66 else |
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67 break; |
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68 endif |
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69 endwhile |
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70 |
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71 unwind_protect_cleanup |
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72 |
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73 page_screen_output = save_page_screen_output; |
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74 |
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75 end_unwind_protect |
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76 |
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77 endfunction |
