if (n <= 1) return 0;
To build tools like that, you yourself need to understand the various ways you can directly interface with the terminal. While the minimal command-line we implemented above is obviously incomplete and not robust, it is straightforward (if tedious) to flesh out the few-dozen features most people expect a command-line to have. After that, you're on par with what's out there, and you are free to implement more features and rich interactions beyond what existing libraries like Readline/Jline provide.
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Myles' character is inspired by the career of former detective Julie Mackay