The go-libvirt project is an open source Go interface to libvirt, a popular virtualization library. Initially, the project only implemented a handful of libvirt's API calls, but its developers used code generation to extend it to cover all 400+ API calls using Sun RPC protocol files. The process involved writing a parser generator using yacc and Go's `goyacc` tool, which generated the necessary code for parsing the protocol files. A lexer was also created to tokenize the input stream. The parser and lexer were then used to generate Go code that could interact with libvirt. However, libvirt departs from Sun RPC in its procedure definitions, so a custom approach was taken to parse these. The project's goal is to make go-libvirt more useful to a wider audience through this code generation process.