This sort of "rich" interaction to your command-line programs is something that most traditional command-line programs and libraries lack. Adding syntax highlighting to Readline would definitely take more than four lines of code! But with your own implementation, everything is possible.
enum:[<escapered<escape,<escapeblue<escape,<escapegreen<escape]
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As you can see, the deletion works, in that after I delete the characters, they are no longer echoed back at me when I press Enter to submit. However, the characters are still sitting their on screen even as I delete them! At least until they are over-written with new characters, as can be seen in the third line in the above example.