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annotate scripts/plot/__gnuplot_version__.m @ 12462:e4dbfe3019b1

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Use PCRE regular expressions throughout Octave.
author Rik <octave@nomad.inbox5.com>
date Sat, 19 Feb 2011 18:21:58 -0800
parents fd0a3ac60b0e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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fd0a3ac60b0e update copyright notices
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2006-2011 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 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{version} =} __gnuplot_version__ ()
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21 ## Undocumented internal function.
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22 ## @end deftypefn
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23
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24 ## Return the version of gnuplot we are using. Note that we do not
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25 ## attempt to handle the case of the user switching to different
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26 ## versions of gnuplot during the same session.
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27
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28 function version = __gnuplot_version__ ()
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29
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30 persistent __version__ = "";
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31
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32 if (isempty (__version__))
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33 [status, output] = system (sprintf ("\"%s\" --version", gnuplot_binary ()));
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34 if (status != 0)
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35 ## This message ends in a newline so that the traceback messages
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36 ## are skipped and people might actually see the message, read it,
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37 ## comprehend it, actually take the advice it gives, and stop
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38 ## asking us why plotting fails when gnuplot is not found.
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39 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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40 endif
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41 output = strrep (output, "gnuplot", "");
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42 output = strrep (output, "patchlevel", ".");
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43 output = strrep (output, "\n", "");
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44 output = strrep (output, "\r", "");
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45 __version__ = strrep (output, " ", "");
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46 endif
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47
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48 version = __version__;
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49
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50 endfunction
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