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annotate scripts/plot/__gnuplot_version__.m @ 8794:f16aafdd99ca

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__gnuplot_version__.m: don't use regexp to extract version number
author John W. Eaton <jwe@octave.org>
date Wed, 18 Feb 2009 01:10:43 -0500
parents 7d6e659acc1a
children 7d48766c21a5
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 ## This message ends in a newline so that the traceback messages
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33 ## are skipped and people might actually see the message, read it,
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34 ## comprehend it, actually take the advice it gives, and stop
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35 ## asking us why plotting fails when gnuplot is not found.
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36 error ("you must have gnuplot installed to display graphics; if you have gnuplot installed in a non-standard location, see the 'gnuplot_binary' function\n");
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37 endif
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38 output = strrep (output, "gnuplot", "");
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39 output = strrep (output, "patchlevel", ".");
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40 output = strrep (output, "\n", "");
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41 output = strrep (output, "\r", "");
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42 __version__ = strrep (output, " ", "");
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43 endif
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44
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45 version = __version__;
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46
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47 endfunction
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