/usr/share/perl5/IkiWiki/Plugin/teximg.pm is in ikiwiki 3.20120202ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | #!/usr/bin/perl
# Licensed under GPL v2 or greater
# (c) 2007 Patrick Winnertz <patrick.winnertz@skolelinux.org>
package IkiWiki::Plugin::teximg;
use warnings;
use strict;
use Digest::MD5 qw(md5_hex);
use File::Temp qw(tempdir);
use HTML::Entities;
use Encode;
use IkiWiki 3.00;
my $default_prefix = <<EOPREFIX;
\\documentclass{article}
\\usepackage[utf8]{inputenc}
\\usepackage{amsmath}
\\usepackage{amsfonts}
\\usepackage{amssymb}
\\pagestyle{empty}
\\begin{document}
EOPREFIX
my $default_postfix = '\\end{document}';
sub import {
hook(type => "getsetup", id => "teximg", call => \&getsetup);
hook(type => "preprocess", id => "teximg", call => \&preprocess);
}
sub getsetup () {
return
plugin => {
safe => 1,
rebuild => undef,
section => "widget",
},
teximg_dvipng => {
type => "boolean",
description => "Should teximg use dvipng to render, or dvips and convert?",
safe => 0,
rebuild => undef,
},
teximg_prefix => {
type => "string",
example => $default_prefix,
description => "LaTeX prefix for teximg plugin",
safe => 0, # Not sure how secure LaTeX is...
rebuild => 1,
},
teximg_postfix => {
type => "string",
example => $default_postfix,
description => "LaTeX postfix for teximg plugin",
safe => 0, # Not sure how secure LaTeX is...
rebuild => 1,
},
}
sub preprocess (@) {
my %params = @_;
my $height = $params{height};
if (! defined $height || ! length $height) {
$height = 12;
}
else {
$height =~ s#(\d+)#$1#;
}
my $code = $params{code};
if (! defined $code && ! length $code) {
error gettext("missing tex code");
}
return create($code, check_height($height), \%params);
}
sub check_height ($) {
# Since latex doesn't support unlimited scaling this function
# returns the closest supported size.
my $height =shift;
my @allowed=(8,9,10,11,12,14,17,20);
my $ret;
my $fit;
foreach my $val (@allowed) {
my $f = abs($val - $height);
if (! defined($fit) || $f < $fit ) {
$ret=$val;
$fit=$f;
}
}
return $ret;
}
sub create ($$$) {
# This function calls the image generating function and returns
# the <img .. /> for the generated image.
my $code = shift;
my $height = shift;
my $params = shift;
if (! defined($height) and not length($height) ) {
$height = 12;
}
my $digest = md5_hex(Encode::encode_utf8($code), $height);
my $imglink= $params->{page} . "/$digest.png";
my $imglog = $params->{page} . "/$digest.log";
will_render($params->{page}, $imglink);
will_render($params->{page}, $imglog);
my $imgurl=urlto($imglink, $params->{destpage});
my $logurl=urlto($imglog, $params->{destpage});
if (-e "$config{destdir}/$imglink" ||
gen_image($code, $height, $digest, $params->{page})) {
return qq{<img src="$imgurl" alt="}
.(exists $params->{alt} ? $params->{alt} : encode_entities($code))
.qq{" class="teximg" />};
}
else {
error qq{<a href="$logurl">}.gettext("failed to generate image from code")."</a>";
}
}
sub gen_image ($$$$) {
# Actually creates the image.
my $code = shift;
my $height = shift;
my $digest = shift;
my $imagedir = shift;
if (!defined $config{teximg_prefix}) {
$config{teximg_prefix} = $default_prefix;
}
if (!defined $config{teximg_postfix}) {
$config{teximg_postfix} = $default_postfix;
}
if (!defined $config{teximg_dvipng}) {
$config{teximg_dvipng} = length `which dvipng 2>/dev/null`;
}
my $tex = $config{teximg_prefix};
$tex .= '\['.$code.'\]';
$tex .= $config{teximg_postfix};
$tex =~ s!\\documentclass{article}!\\documentclass[${height}pt]{article}!g;
$tex =~ s!\\documentclass{scrartcl}!\\documentclass[${height}pt]{scrartcl}!g;
my $tmp = eval { create_tmp_dir($digest) };
if (! $@ &&
writefile("$digest.tex", $tmp, $tex) &&
system("cd $tmp; shell_escape=f openout_any=p openin_any=p latex --interaction=nonstopmode $digest.tex < /dev/null > /dev/null") == 0 &&
# ensure destination directory exists
writefile("$imagedir/$digest.png", $config{destdir}, "") &&
(($config{teximg_dvipng} &&
system("dvipng -D 120 -bg Transparent -T tight -o $config{destdir}/$imagedir/$digest.png $tmp/$digest.dvi > $tmp/$digest.log") == 0
) || (!$config{teximg_dvipng} &&
system("dvips -E $tmp/$digest.dvi -o $tmp/$digest.ps 2> $tmp/$digest.log") == 0 &&
system("convert -density 120 -trim -transparent \"#FFFFFF\" $tmp/$digest.ps $config{destdir}/$imagedir/$digest.png > $tmp/$digest.log") == 0
))) {
return 1;
}
else {
# store failure log
my $log="";
{
if (open(my $f, '<', "$tmp/$digest.log")) {
local $/=undef;
$log = <$f>;
close($f);
}
}
writefile("$digest.log", "$config{destdir}/$imagedir", $log);
return 0;
}
}
sub create_tmp_dir ($) {
# Create a temp directory, it will be removed when ikiwiki exits.
my $base = shift;
my $template = $base.".XXXXXXXXXX";
my $tmpdir = tempdir($template, TMPDIR => 1, CLEANUP => 1);
return $tmpdir;
}
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