From 21407b53b00c3032cae689f737d116771735e730 Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Tue, 14 Jun 2022 17:29:34 +0200
Subject: implement format inkscape

---
 bin/feature-check.pl | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/bin/feature-check.pl b/bin/feature-check.pl
index 12ae7ed..fca50a9 100755
--- a/bin/feature-check.pl
+++ b/bin/feature-check.pl
@@ -85,7 +85,7 @@ based on coverage and embedded annotations of its documentation.
 
 =item B<--format>
 
-Output format, either of I<table> I<ascii> I<ansi> I<svg> I<graphviz>
+Output format, either of I<table> I<ascii> I<ansi> I<svg> I<inkscape> I<graphviz>
 S<(default value: I<ansi>)>
 
 =back
@@ -209,12 +209,63 @@ for ( $OPT{format} ) {
 	when ('ansi') { print $graph->as_boxart() }
 	when ('svg') { print $graph->as_svg() }
 	when ('graphviz') { print $graph->as_graphviz() }
+	when ('inkscape') {
+		$_ = $graph->as_svg();
+
+		# define Inkscape namespace, for declaring "connectors"
+		s{<svg\s[^>]*\K}{ xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"};
+
+		# collect identifiers for nodes
+		my %node;
+		$node{$2} = $1 while m{<g\s+id="(\d+)"\s+class="node">\s*<!--\s*(\S+),\s+rect\s+-->}g;
+
+		# replace concrete arrows with abstract "connectors"
+		s{
+			class="edge">\s*
+			<!--\s+
+				from\s+(?<from>\S+)\s+
+				to\s+(?<to>\S+)\s+
+			-->(?<space>\s*)
+
+			# drop these
+			\K
+			(?:
+				\s*<!--\s*[^>]*\s*-->
+				(?:
+					\s*<line\s[^>]*>
+				|
+					\s*<g\s+[^>]*>
+					\s*<line\s[^>]*>
+					\s*<line\s[^>]*>
+					\s*</g>
+				)
+			)+
+			\s*<use\s[^>]*>
+		}{ inkscape_path( \%+, \%node ) }gsxe;
+
+		# keep edges away from nodes
+		s{<g\s+id="(\d+)"\s+class="node"\K}{ inkscape:connector-avoid="true"}g;
+
+		# fix styling of edges
+		s/\.edge\s*{\s*font-size:\s*13px;(\s*)stroke:(\s*)black;\K/$1fill:$2none;/;
+
+		print $_;
+	}
 	default { $log->fatal("unsupported format:$_") && exit 1 }
 }
 
 $log->error($_) for $graph->errors();
 $log->warn($_) for $graph->warnings();
 
+sub inkscape_path {
+	my ( $mref, $nref ) = @_;
+	return join $mref->{space},
+		"<path d=\"\" inkscape:connector-type=\"polyline\"",
+		" inkscape:connector-curvature=\"0\"",
+		" inkscape:connection-start=\"#$nref->{$mref->{from}}\"",
+		" inkscape:connection-end=\"#$nref->{$mref->{to}}\" />"
+}
+
 sub feature {
 	my ($path, $state) = @_;
 	my ( $feature, $docs, $maturity );
-- 
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