GNU Readline: how to clear the input line?

Question

I use GNU Readline in the \"select\" fashion, by registering a callback function like so:

rl_callback_handler_install(\"\", on_readline_input);

Answer 1

Do any of these functions help?

• rl_reset_line_state()
• rl_clear_message()
• rl_delete_text()
• rl_kill_text()

Also, can you mediate the server output - have the server output controlled so that it only appears when and where you want it to, rather than just sprawling over what the user is typing? For example, if your application is running in curses mode, could you have a split window with a line or two at the bottom in one sub-window reserved for user input and the rest of the output (server output and accepted user input) in a second sub-window above it?