Embed SVG icons directly into output.

[homepage.git] / lib / svg2png.rb

diff --git a/lib/svg2png.rb b/lib/svg2png.rb
new file mode 100644 (file)
index 0000000..6147f2b
--- /dev/null
+++ b/lib/svg2png.rb
@@ -0,0 +1,35 @@
+# 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