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some more UI conventions that make “the terminal” feel unified

* there’s a loose standard for command line arguments that many programs follow (not all!)
* TUI programs usually support using the mouse
* interactive REPLs often use readline or imitate it

i’m not sure how many of these are written down or standardized anywhere, it’s hard to imagine there’s a standard saying “you should imitate readline if appropriate” but maybe there is?

(2/?)