Add file injection to help split apart big files without needing to prerender individual pieces

README.md

@@ -31,6 +31,8 @@ unless they have the following names:
 * (protect): The layer will not be deleted if it is hidden. Good for clone sources.
 * (child visible): The layer will be visible if its parent layer is also made visible. Good if you
                    break artwork up into multiple layers (inks, colors, shading, etc.)
+* (inject filename.svg): Include all the layers of another SVG file as child layers of this layer.
+                         Does not copy patterns/gradients yet!
 
 Hiding/showing layers is the way that you make certain card elements appear/disappear on
 different types of cards with with different properties. You can also replace the text in

lib/svggvs/session.rb

@@ -66,6 +66,7 @@ module SVGGVS
           end
 
           with_new_target do |target|
+            target.inject!
             target.active_layers = card[:active_layers]
             target.replacements = card[:replacements]
           end

lib/svggvs/target.rb

@@ -12,6 +12,26 @@ module SVGGVS
       @target
     end
 
+    def injected_sources
+      @injected_sources ||= {}
+    end
+
+    def inject!
+      css("g[inkscape|groupmode='layer']").each do |layer|
+        if filename = layer['inkscape:label'][/inject (.*\.svg)/, 1]
+          injected_sources[filename] ||= begin
+                                            data = Nokogiri::XML(::File.read(filename))
+
+                                            data.css("svg > g[inkscape|groupmode='layer']")
+                                          end
+
+          injected_sources[filename].each do |additional_layer|
+            layer << additional_layer.to_xml
+          end
+        end
+      end
+    end
+
     def active_layers=(layers)
       css("g[inkscape|groupmode='layer']").each do |layer|
         if layers.include?(layer['inkscape:label'])