--- /dev/null
+# Nick's web site: scour filter. Run scour to reduce the size of SVG images.
+#
+# 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 ScourFilter < Nanoc::Filter
+ identifier :scour
+
+ def run(content, params = {})
+ defaults = { quiet: true, id_stripping: true, shorten_ids: true }
+ args = []
+ defaults.merge(params).each do |key, val|
+ prefix = nil
+
+ # Normalize some argument names for consistency
+ case key
+ when :comment_stripping, :viewboxing, :id_stripping
+ prefix = :enable
+ when :simplify_colors, :style_to_xml, :group_collapsing,
+ :embed_rasters
+ prefix = :disable
+ when :renderer_workaround, :line_breaks
+ prefix = :no if not val
+ end
+
+ # scour does not generally have inverse options, so drop
+ # some nonsense combinations.
+ next if val and prefix == :disable
+ next if val and key == :line_breaks
+ next if !val
+
+ arg = "--"
+ if prefix then arg << "#{prefix}-" end
+ arg << key.to_s.gsub("_", "-")
+ if val != true then arg << "=#{val}" end
+
+ args << arg
+ end
+
+ content, status = Open3.capture2("scour", *args, stdin_data: content)
+ raise "scour failed" if status != 0
+
+ return content
+ end
+end
'markdown', 'md', 'ms', 'mustache',
'php',
'rb', 'rdoc',
- 'sass', 'scss', 'sgml', 'slim',
+ 'sass', 'scss', 'sgml', 'slim', 'svg',
'txt',
'xhtml', 'xml', 'xsl' ]