"""]]
This plugin uses the [[!cpan Digest::SHA]] perl module.
+
+The full source code is:
+
+ #! /usr/bin/perl
+
+ package IkiWiki::Plugin::asymptote;
+ use warnings;
+ use strict;
+ use Digest::MD5 qw(md5_hex);
+ use File::Temp qw(tempdir);
+ use HTML::Entities;
+ use Encode;
+ use IkiWiki 3.00;
+
+ sub import {
+ hook(type => "getsetup", id => "asymptote", call => \&getsetup);
+ hook(type => "preprocess", id => "asymptote", call => \&preprocess);
+ }
+
+ sub getsetup () {
+ return
+ plugin => {
+ safe => 1,
+ rebuild => undef,
+ section => "widget",
+ },
+ }
+
+ sub preprocess (@) {
+ my %params = @_;
+
+ my $code = $params{src};
+ if (! defined $code && ! length $code) {
+ error gettext("missing src attribute");
+ }
+ return create($code, \%params);
+ }
+
+ sub create ($$$) {
+ # This function calls the image generating function and returns
+ # the <img .. /> for the generated image.
+ my $code = shift;
+ my $params = shift;
+
+ my $digest = md5_hex(Encode::encode_utf8($code));
+
+ my $imglink= $params->{page} . "/$digest.png";
+ my $imglog = $params->{page} . "/$digest.log";
+ will_render($params->{page}, $imglink);
+ will_render($params->{page}, $imglog);
+
+ my $imgurl=urlto($imglink, $params->{destpage});
+ my $logurl=urlto($imglog, $params->{destpage});
+
+ if (-e "$config{destdir}/$imglink" ||
+ gen_image($code, $digest, $params->{page})) {
+ return qq{<img src="$imgurl}
+ .(exists $params->{alt} ? qq{" alt="} . $params->{alt} : qq{})
+ .qq{" class="asymptote" />};
+ }
+ else {
+ error qq{<a href="$logurl">}.gettext("failed to generate image from code")."</a>";
+ }
+ }
+
+ sub gen_image ($$$$) {
+ # Actually creates the image.
+ my $code = shift;
+ my $digest = shift;
+ my $imagedir = shift;
+
+ my $tmp = eval { create_tmp_dir($digest) };
+ if (! $@ &&
+ writefile("$digest.asy", $tmp, $code) &&
+ writefile("$imagedir/$digest.png", $config{destdir}, "") &&
+ system("asy -render=2 -offscreen -f png -o $config{destdir}/$imagedir/$digest.png $tmp/$digest.asy &>$tmp/$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;
+ }
+
+ 1
+