Re: numbering lines in groups

> Are there other ways to increment via a map?

I didn't understand your problem, the map looks too hard to read, and
has tricky side effect semantics, and this leads to the suggestion
that you use a couple of functions, say, (minimally tested):

let lpb = 4 "lines per block (zero based)
function! Renum()
let g:b = 1
let g:l = 0
'<,'>s/^/\=ResInc()/
endfunction
function! ResInc()
let result = printf('( %4d_%X_)', g:b, g:l)
if g:l < g:lpb
let g:l += 1
else
let g:l = 0
let g:b += 1
endif
return result
endfunction

vmap <F4> :<c-u>call Renum()<cr>

A bit pedestrian, I imagine a modern approach would have a function
object, but easy to follow, tweak, and debug, and can have comments
added. The moral of the story is when maps start getting messy or
long, just make them call a function.

Regards, John

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