The Debug Adapter Protocol is a REPL protocol in disguise (zignar.net)

A recent development in the AI and machine learning community is the innovative use of the Debug Adapter Protocol (DAP) to create nluarepl, a REPL (Read-Eval-Print Loop) for the Neovim Lua interpreter. Traditionally, DAP is designed to facilitate the communication between development tools and debuggers, but the creator discovered that it could effectively function as a REPL interface. This novel approach allows users to evaluate expressions and receive structured results, thereby enhancing the interactive experience without the need to build a separate REPL UI from scratch. This integration of DAP into a REPL is significant as it leverages existing debugging infrastructure to simplify the development process, enabling the reuse of interfaces from existing plugins like nvim-dap. Key technical functionalities include the ability to evaluate expressions with a clear response structure, manage variable references for deeper data inspection, and implement features like code completion and log points. By utilizing DAP, developers can streamline the interaction with the Lua interpreter, resulting in a more cohesive user experience that combines debugging and evaluation capabilities seamlessly.