remove models directory and switch to generating them via script

openscad.rb

@@ -0,0 +1,30 @@
+module OpenSCAD
+  def self.expand(filename)
+    lines = File.readlines(filename)
+    old_dir = Dir.getwd
+
+    Dir.chdir File.dirname(filename)
+    lines = lines.flat_map do |line|
+      if line =~ /(include|use)\s*<(.*)>/
+        # File.readlines("./#{$2}")
+        expand("./#{$2}")
+      # in lieu of actually implementing `use`, we can just cull this final line from key.scad
+      elsif line =~ /example\_key\(\);/
+        ""
+      else
+        line
+      end
+    end
+
+    Dir.chdir old_dir
+
+    lines
+  end
+
+  def self.expand_openSCAD_file(source, destination)
+    lines = OpenSCAD::expand(source)
+
+    f = File.open(destination, 'w')
+    f.write lines.join
+  end
+end