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