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annotate scripts/plot/__gnuplot_version__.m @ 11753:5cedea7a0fdd release-3-0-x

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Display a (hopefully) informative error message if gnuplot isn't found
author sh@sh-laptop
date Wed, 16 Apr 2008 14:19:59 -0400
parents a1dbe9d80eee
children 9c15f385811c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2006, 2007 Daniel Sebald
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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 ## Undocumented internal function.
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20
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21 ## Return the version of gnuplot we are using. Note that we do not
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22 ## attempt to handle the case of the user switching to different
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23 ## versions of gnuplot during the same session.
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24
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25 function version = __gnuplot_version__ ()
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26
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27 persistent __version__ = "";
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28
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29 if (isempty (__version__))
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30 [status, output] = system (sprintf ("%s --version", gnuplot_binary ()));
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31 if (status != 0)
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32 error ("you must have gnuplot installed to display graphics; if you have gnuplot installed in a non-standard location, see the 'gnuplot_binary' function");
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33 endif
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34 pattern = "^[^\\s]*\\s*([0-9]+\\.[0-9]+)\\s*[^\\s]*\\s*([^\\s]*)";
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35 [d1, d2, d3, d4, matches] = regexp (output, pattern);
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36 if (iscell (matches) && numel (matches) > 0 && iscellstr (matches{1}))
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37 __version__ = matches{1}{1};
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38 endif
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39 endif
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40
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41 version = __version__;
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42
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43 endfunction
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44