149 lines
3.7 KiB
Perl
149 lines
3.7 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 => "needsbuild", id => "version", call => \&needsbuild);
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hook(type => "preprocess", id => "graph", call => \&graph, scan => 1);
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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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section => "widget",
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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 needsbuild {
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my $needsbuild=shift;
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foreach my $page (keys %pagestate) {
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if (exists $pagestate{$page}{graph} &&
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exists $pagesources{$page} &&
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grep { $_ eq $pagesources{$page} } @$needsbuild) {
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# remove state, will be re-added if
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# the graph is still there during the rebuild
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delete $pagestate{$page}{graph};
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}
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}
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return $needsbuild;
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}
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sub render_graph (\%) {
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my %params = %{(shift)};
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my $src = "charset=\"utf-8\";\n";
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$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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# and as a unique identifier for its imagemap.
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eval q{use Digest::SHA};
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error($@) if $@;
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my $sha=IkiWiki::possibly_foolish_untaint(Digest::SHA::sha1_hex($params{type}.$src));
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$src = "$params{type} graph$sha {\n".$src;
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my $dest=$params{page}."/graph-".$sha.".png";
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will_render($params{page}, $dest);
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my $map=$pagestate{$params{destpage}}{graph}{$sha};
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if (! -e "$config{destdir}/$dest" || ! defined $map) {
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# Use ikiwiki's function to create the image file, this makes
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# sure needed subdirs are there and does some sanity checking.
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writefile($dest, $config{destdir}, "");
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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, "$params{prog} -Tpng -o '$config{destdir}/$dest' -Tcmapx");
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# open2 doesn't respect "use open ':utf8'"
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binmode (IN, ':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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local $/ = undef;
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$map=$pagestate{$params{destpage}}{graph}{$sha}=<IN>;
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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 || $?);
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}
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return "<img src=\"".urlto($dest, $params{destpage}).
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"\" usemap=\"#graph$sha\" />\n".
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$map;
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}
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sub graph (@) {
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my %params=@_;
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# Support wikilinks in the graph source.
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my $src=$params{src};
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$src="" unless defined $src;
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$src=IkiWiki::linkify($params{page}, $params{destpage}, $params{src});
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return unless defined wantarray; # scan mode short-circuit
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if ($src ne $params{src}) {
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# linkify makes html links, but graphviz wants plain
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# urls. This is, frankly a hack: Process source as html,
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# throw out everything inside tags that is not a href.
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my $s;
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my $nested=0;
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use HTML::Parser;
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error $@ if $@;
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my $p=HTML::Parser->new(api_version => 3);
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$p->handler(start => sub {
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my %attrs=%{shift()};
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if (exists $attrs{href}) {
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if ($s=~/href\s*=\s*"$/) {
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$s.=$attrs{href};
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}
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elsif ($s=~/href\s*=\s*$/) {
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$s.="\"$attrs{href}\"";
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}
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else {
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$s.="href=\"$attrs{href}\"";
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}
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}
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$nested++;
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}, "attr");
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$p->handler(end => sub {
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$nested--;
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});
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$p->handler(default => sub {
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$s.=join("", @_) unless $nested;
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}, "text");
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$p->parse($src);
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$p->eof;
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$params{src}=$s;
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}
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else {
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$params{src}=$src;
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}
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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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