+# Nick's web site: svg2png filter: convert SVG to PNG using rsvg-convert.
+#
+# Copyright © 2021 Nick Bowler
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+class SVG2PNG < Nanoc::Filter
+ identifier :svg2png
+ type :text => :binary
+
+ def run(content, params = {})
+ args = ["-o", output_filename]
+ params.each do |key, val|
+ next if !val
+
+ args << "--#{key.to_s.gsub("_", "-")}"
+ if val != true then args << val.to_s end
+ end
+
+ dummy, status = Open3.capture2("rsvg-convert", *args,
+ stdin_data: content)
+ raise "rsvg-convert failed" if status != 0
+ end
+end