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#!/usr/bin/perl
# graphviz plugin for ikiwiki: render graphviz source as an image.
# Josh Triplett
package IkiWiki::Plugin::graphviz;
use warnings;
use strict;
use IkiWiki 3.00;
use IPC::Open2;
sub import {
hook(type => "getsetup", id => "graphviz", call => \&getsetup);
hook(type => "preprocess", id => "graph", call => \&graph);
}
sub getsetup () {
return
plugin => {
safe => 1,
rebuild => undef,
section => "widget",
},
}
my %graphviz_programs = (
"dot" => 1, "neato" => 1, "fdp" => 1, "twopi" => 1, "circo" => 1
);
sub render_graph (\%) {
my %params = %{(shift)};
my $src = "$params{type} g {\n";
$src .= "charset=\"utf-8\";\n";
$src .= "ratio=compress;\nsize=\"".($params{width}+0).", ".($params{height}+0)."\";\n"
if defined $params{width} and defined $params{height};
$src .= $params{src};
$src .= "}\n";
# Use the sha1 of the graphviz code as part of its filename.
eval q{use Digest::SHA1};
error($@) if $@;
my $dest=$params{page}."/graph-".
IkiWiki::possibly_foolish_untaint(Digest::SHA1::sha1_hex($src)).
".png";
will_render($params{page}, $dest);
if (! -e "$config{destdir}/$dest") {
my $pid;
my $sigpipe=0;
$SIG{PIPE}=sub { $sigpipe=1 };
$pid=open2(*IN, *OUT, "$params{prog} -Tpng");
# open2 doesn't respect "use open ':utf8'"
binmode (OUT, ':utf8');
print OUT $src;
close OUT;
my $png;
{
local $/ = undef;
$png = <IN>;
}
close IN;
waitpid $pid, 0;
$SIG{PIPE}="DEFAULT";
error gettext("failed to run graphviz") if $sigpipe;
if (! $params{preview}) {
writefile($dest, $config{destdir}, $png, 1);
}
else {
# can't write the file, so embed it in a data uri
eval q{use MIME::Base64};
error($@) if $@;
return "<img src=\"data:image/png;base64,".
encode_base64($png)."\" />";
}
}
if ($params{preview}) {
return "<img src=\"".urlto($dest, "")."\" />\n";
}
else {
return "<img src=\"".urlto($dest, $params{destpage})."\" />\n";
}
}
sub graph (@) {
my %params=@_;
$params{src} = "" unless defined $params{src};
$params{type} = "digraph" unless defined $params{type};
$params{prog} = "dot" unless defined $params{prog};
error gettext("prog not a valid graphviz program") unless $graphviz_programs{$params{prog}};
return render_graph(%params);
}
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