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I'm only using GNU readline for my bash prompt, but if I press v it spawns a full-on $EDITOR instance to edit the commandline.

This is awesome (I still have a lot to learn about bash) and effectively what my module does.

Just so others know, you have to put bash in vi mode and press Esc before v (otherwise it's ctrl+x ctrl+e).

set -o vi

Aye, looks like I was wrong. This is a feature that bash has, not Readline. (in bash 4.2: bashline.c:858)