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375
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1 # Copyright (C) 1993, 1994 John W. Eaton |
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245
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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 the |
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7 # Free Software Foundation; either version 2, or (at your option) any |
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8 # later version. |
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9 # |
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT |
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 # 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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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18 |
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375
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19 function num = menu (t, ...) |
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4
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20 |
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211
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21 # usage: menu (title, opt1, ...) |
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4
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22 # |
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23 # See also: disp, printf, input |
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24 |
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211
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25 if (nargin < 2) |
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26 error ("usage: menu (title, opt1, ...)"); |
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4
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27 endif |
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28 |
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29 # Force pending output to appear before the menu. |
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30 |
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31 fflush (stdout); |
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32 |
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33 # Don't send the menu through the pager since doing that can cause |
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34 # major confusion. |
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35 |
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36 save_page_screen_output = page_screen_output; |
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37 page_screen_output = "false"; |
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38 |
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39 if (! isempty (t)) |
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40 disp (t); |
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41 printf ("\n"); |
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42 endif |
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43 |
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44 nopt = nargin - 1; |
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45 |
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46 while (1) |
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211
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47 va_start (); |
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4
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48 for i = 1:nopt |
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211
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49 printf (" [%2d] ", i); |
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50 disp (va_arg ()); |
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4
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51 endfor |
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52 printf ("\n"); |
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375
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53 s = ""; |
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54 s = input ("pick a number, any number: ", "s"); |
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55 if (strcmp (s, "")) |
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56 printf ("\n"); |
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57 continue; |
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58 endif |
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59 eval (sprintf ("num = %s;", s)); |
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60 if (! is_scalar (num) || num < 1 || num > nopt) |
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61 printf ("\nerror: input invalid or out of range\n\n"); |
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4
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62 else |
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63 break; |
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64 endif |
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65 endwhile |
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66 |
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67 page_screen_output = save_page_screen_output; |
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68 |
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69 endfunction |
