Add support for svgo 2.x and 3.x

Author: tomhughes

lib/image_optim/worker/svgo.rb

@@ -2,6 +2,7 @@
 
 require 'image_optim/option_helpers'
 require 'image_optim/worker'
+require 'fspath'
 
 class ImageOptim
   class Worker
@@ -40,15 +41,45 @@ def optimize(src, dst, options = {})
           --input #{src}
           --output #{dst}
         ]
-        disable_plugins.each do |plugin_name|
-          args.unshift "--disable=#{plugin_name}"
-        end
-        enable_plugins.each do |plugin_name|
-          args.unshift "--enable=#{plugin_name}"
+        if resolve_bin!(:svgo).version >= '2.0.0'
+          config_file = plugins_config_file
+          args.unshift "--config=#{config_file.path}"
+        else
+          disable_plugins.each do |plugin_name|
+            args.unshift "--disable=#{plugin_name}"
+          end
+          enable_plugins.each do |plugin_name|
+            args.unshift "--enable=#{plugin_name}"
+          end
         end
         args.unshift "--precision=#{precision}" if allow_lossy
         execute(:svgo, args, options) && optimized?(src, dst)
       end
+
+    private
+
+      def plugins_config_file
+        FSPath.temp_file %w[image_optim .js] do |config_file|
+          config_file.puts 'export default {'
+          config_file.puts '  plugins: ['
+          config_file.puts '    {'
+          config_file.puts '      name: \'preset-default\','
+          config_file.puts '      params: {'
+          config_file.puts '        overrides: {'
+          disable_plugins.each do |plugin_name|
+            config_file.puts "          #{plugin_name}: false,"
+          end
+          enable_plugins.each do |plugin_name|
+            config_file.puts "          #{plugin_name}: true,"
+          end
+          config_file.puts '        }'
+          config_file.puts '      }'
+          config_file.puts '    }'
+          config_file.puts '  ]'
+          config_file.puts '};'
+          config_file
+        end
+      end
     end
   end
 end