cog content generation tool

 Cog is a file generation tool. It lets you use pieces of Python code as
 generators in your source files to generate whatever text you need.
 .
 Cog transforms files in a very simple way: it finds chunks of Python code
 embedded in them, executes the Python code, and inserts its output back into
 the original file. The file can contain whatever text you like around the
 Python code. It will usually be source code.