The terminal waits. Quiet, dark, and unforgiving. Ncurses is the tool that gives it shape, color, and motion. But with that power comes risk. Without separation of duties, your Ncurses-based application can become fragile, insecure, and impossible to maintain.
Separation of duties in Ncurses means drawing clear lines between input handling, output rendering, and core application logic. Each layer must be independent. Input must never directly manipulate the UI. The UI must never process business logic. Logic must never care how characters reach the screen. This structure keeps code clean, testable, and resilient against errors.
In practice, the architecture starts with dedicated modules. One module captures keyboard or mouse events via Ncurses functions like getch() and stores them as normalized commands. Another module handles rendering: using addstr(), mvwprintw(), and refresh() to produce consistent views. The core logic layer acts only on those commands and updates the model. Communication happens through well-defined interfaces, not shared buffers or implicit state.