preexec & ps0 functionality

[tungstengmd]

i like zsh's preexec feature and was thinking it'd be awesome for a similar feature in ksh
and also the ps0 feature from bash which replaces the prompt before a typed command is executed

[McDutchie]

I'll think about it.

bash's PS0 variable might not be a bad thing to add, and it should be fairly trivial to implement.

As for zsh's preexec function, ksh's DEBUG trap currently provides very similar functionality, so I don't know about that one.

[tungstengmd]

i did hear about the DEBUG trap, i mainly forgot about it because of mksh's lack of support for it 😔 but yea ps0 would be nice, it'll make life easier when making transient prompts