2007-08-22 02:59:41 +02:00
|
|
|
#!/usr/bin/perl
|
|
|
|
# Licensed under GPL v2 or greater
|
|
|
|
# (c) 2007 Patrick Winnertz <patrick.winnertz@skolelinux.org>
|
|
|
|
|
2007-08-23 23:19:21 +02:00
|
|
|
package IkiWiki::Plugin::teximg;
|
2007-08-22 02:59:41 +02:00
|
|
|
use warnings;
|
|
|
|
use strict;
|
|
|
|
use Digest::MD5 qw(md5_hex);
|
|
|
|
use File::Temp qw(tempdir);
|
2007-08-23 23:22:44 +02:00
|
|
|
use HTML::Entities;
|
2007-08-22 02:59:41 +02:00
|
|
|
use IkiWiki 2.00;
|
|
|
|
|
|
|
|
sub import { #{{{
|
2007-08-23 23:19:21 +02:00
|
|
|
hook(type => "preprocess", id => "teximg", call => \&preprocess);
|
2007-08-22 02:59:41 +02:00
|
|
|
} #}}}
|
|
|
|
|
|
|
|
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 $code) {
|
2007-08-23 23:19:21 +02:00
|
|
|
return "[[teximg ".gettext("missing tex code"). "]]";
|
2007-08-22 02:59:41 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
if (check($code)) {
|
|
|
|
return create($code, check_height($height), \%params);
|
|
|
|
}
|
|
|
|
else {
|
2007-08-23 23:19:21 +02:00
|
|
|
return "[[teximg ".gettext("code includes disallowed latex commands"). "]]";
|
2007-08-22 02:59:41 +02:00
|
|
|
}
|
|
|
|
} #}}}
|
|
|
|
|
|
|
|
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 ($$$) { #{{{
|
|
|
|
# This function calls the image generating function and returns
|
|
|
|
# the <img .. /> for the generated image.
|
|
|
|
my $code = shift;
|
|
|
|
my $height = shift;
|
|
|
|
my $params = shift;
|
|
|
|
|
|
|
|
if (! defined($height) and not length($height) ) {
|
|
|
|
$height = 12;
|
|
|
|
}
|
|
|
|
|
|
|
|
my $digest = md5_hex($code, $height);
|
|
|
|
|
2008-03-12 19:21:48 +01:00
|
|
|
my $imglink= $params->{destpage} . "/$digest.png";
|
|
|
|
my $imglog = $params->{destpage} . "/$digest.log";
|
2007-08-22 02:59:41 +02:00
|
|
|
will_render($params->{destpage}, $imglink);
|
|
|
|
will_render($params->{destpage}, $imglog);
|
|
|
|
|
2008-03-12 19:21:48 +01:00
|
|
|
my $imgurl=urlto($imglink, $params->{destpage});
|
|
|
|
my $logurl=urlto($imglink, $params->{destpage});
|
2007-08-22 02:59:41 +02:00
|
|
|
|
|
|
|
if (-e "$config{destdir}/$imglink" ||
|
2008-01-10 02:04:51 +01:00
|
|
|
gen_image($code, $height, $digest, $params->{page})) {
|
2007-08-23 23:19:21 +02:00
|
|
|
return qq{<img src="$imgurl" alt="}
|
2007-08-23 23:23:24 +02:00
|
|
|
.(exists $params->{alt} ? $params->{alt} : encode_entities($code))
|
2007-08-23 23:19:21 +02:00
|
|
|
.qq{" class="teximg" />};
|
2007-08-22 02:59:41 +02:00
|
|
|
}
|
|
|
|
else {
|
2007-08-23 23:19:21 +02:00
|
|
|
return qq{[[teximg <a href="$logurl">}.gettext("failed to generate image from code")."</a>]]";
|
2007-08-22 02:59:41 +02:00
|
|
|
}
|
|
|
|
} #}}}
|
|
|
|
|
|
|
|
sub gen_image ($$$$) { #{{{
|
|
|
|
# Actually creates the image.
|
|
|
|
my $code = shift;
|
|
|
|
my $height = shift;
|
|
|
|
my $digest = shift;
|
|
|
|
my $imagedir = shift;
|
|
|
|
|
|
|
|
#TODO This should move into the setup file.
|
|
|
|
my $tex = '\documentclass['.$height.'pt]{scrartcl}';
|
|
|
|
$tex .= '\usepackage[version=3]{mhchem}';
|
|
|
|
$tex .= '\usepackage{amsmath}';
|
|
|
|
$tex .= '\usepackage{amsfonts}';
|
|
|
|
$tex .= '\usepackage{amssymb}';
|
|
|
|
$tex .= '\pagestyle{empty}';
|
|
|
|
$tex .= '\begin{document}';
|
|
|
|
$tex .= '$$'.$code.'$$';
|
|
|
|
$tex .= '\end{document}';
|
|
|
|
|
|
|
|
my $tmp = eval { create_tmp_dir($digest) };
|
|
|
|
if (! $@ &&
|
|
|
|
writefile("$digest.tex", $tmp, $tex) &&
|
|
|
|
system("cd $tmp; latex --interaction=nonstopmode $tmp/$digest.tex > /dev/null") == 0 &&
|
|
|
|
system("dvips -E $tmp/$digest.dvi -o $tmp/$digest.ps 2> $tmp/$digest.log") == 0 &&
|
|
|
|
# ensure destination directory exists
|
|
|
|
writefile("$imagedir/$digest.png", $config{destdir}, "") &&
|
|
|
|
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;
|
|
|
|
{
|
|
|
|
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 $tmpdir;
|
|
|
|
} #}}}
|
|
|
|
|
|
|
|
sub check ($) { #{{{
|
|
|
|
# Check if the code is ok
|
|
|
|
my $code = shift;
|
|
|
|
|
|
|
|
my @badthings = (
|
|
|
|
qr/\$\$/,
|
|
|
|
qr/\\include/,
|
|
|
|
qr/\\includegraphic/,
|
|
|
|
qr/\\usepackage/,
|
|
|
|
qr/\\newcommand/,
|
|
|
|
qr/\\renewcommand/,
|
|
|
|
qr/\\def/,
|
|
|
|
qr/\\input/,
|
|
|
|
qr/\\open/,
|
|
|
|
qr/\\loop/,
|
|
|
|
qr/\\errorstopmode/,
|
|
|
|
qr/\\scrollmode/,
|
|
|
|
qr/\\batchmode/,
|
|
|
|
qr/\\read/,
|
|
|
|
qr/\\write/,
|
|
|
|
);
|
|
|
|
|
|
|
|
foreach my $thing (@badthings) {
|
|
|
|
if ($code =~ m/$thing/ ) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 1;
|
|
|
|
} #}}}
|
|
|
|
|
|
|
|
1
|