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BZ 6534 - Make the converter aware of relative mtimes as well as
just the non-empty existence of the destination file.

    1: # The LearningOnline Network
    2: # help_graphics_converter - converts help .png into .gif and .eps
    3: #
    4: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    5: #
    6: # LON-CAPA is free software; you can redistribute it and/or modify
    7: # it under the terms of the GNU General Public License as published by
    8: # the Free Software Foundation; either version 2 of the License, or
    9: # (at your option) any later version.
   10: #
   11: # LON-CAPA is distributed in the hope that it will be useful,
   12: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   13: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   14: # GNU General Public License for more details.
   15: #
   16: # You should have received a copy of the GNU General Public License
   17: # along with LON-CAPA; if not, write to the Free Software
   18: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   19: #
   20: # /home/httpd/html/adm/gpl.txt
   21: #
   22: # http://www.lon-capa.org/
   23: #
   24: # YEAR=2002
   25: # 7/4, Jeremy Bowers
   26: #
   27: ###
   28: 
   29: use strict;
   30: 
   31: ##
   32: #  Sub to determine the relative modification dates of files:
   33: #
   34: # @param file1 - First file
   35: # @param file2 - Seond file
   36: #
   37: # @return - 0 if file 1's mtime is <= file2's 1 otherwise.
   38: sub newer {
   39:     my ($file1, $file2) = @_;
   40: 
   41:     # IF file2 does not exist, return false to force the build:
   42: 
   43:     if (not (-s $file2)) {
   44: 	return 0;
   45:     }
   46: 
   47:     # Check modification times if file2 exists:
   48: 
   49:     my $m1 = (stat($file1))[9];
   50:     my $m2 = (stat($file2))[9];
   51: 
   52:     return $m2 > $m1;
   53: }
   54: 
   55: my $dirprefix = "../html/adm/help/";
   56: 
   57: # Check that the png directory exists
   58: if (not (-d $dirprefix . "png/"))
   59: { die "Can't convert help graphics because the png directory is not ".
   60:       "installed."; }
   61: 
   62: mkdir $dirprefix . "gif/", 0755;
   63: mkdir $dirprefix . "eps/", 0755;
   64: 
   65: my $convert = `which convert`;
   66: if ($convert eq '')
   67: {
   68:     open LOG, ">> WARNINGS";
   69:     print LOG "**** ERROR **** ImageMagick is not installed. You must install ImageMagick to use LON-CAPA. Please see your installation instructions.\n";
   70:     print "**** ERROR **** ImageMagick is not installed. You must install ImageMagick to use LON-CAPA. Please see your installation instructions.\n";
   71:     exit;
   72: }
   73: 
   74: foreach my $file (glob($dirprefix . "png/*.png"))
   75: {
   76:     my $filename = substr($file, rindex($file, "/") + 1);
   77:     my $gifdest = $dirprefix . "gif/" . substr($filename, 0, -4) . ".gif";
   78:     my $epsdest = $dirprefix . "eps/" . substr($filename, 0, -4) . ".eps";
   79:     
   80:     
   81:     print "Converting $filename... gif";
   82:     system ("convert $file $gifdest\n") if (not &newer($file, $gifdest));
   83:     print " eps";
   84:     system ("convert $file $epsdest\n") if (not &newer($file, $epsdest));
   85:     print " done.\n";
   86: }