Sum operator

sum-operator.vim

" Print the sum of the lines covered by visual selection or motion
function! Sum(type, ...)
	let sel_save = &selection
	let &selection = "inclusive"
	let reg_save = @@

	*t'>
	'[,']!awk '{ sum += $0 } END { print sum }'

	let &selection = sel_save
	let @@ = reg_save
endfunction
nmap <silent> <key> :set opfunc=Sum<CR>g@
xmap <silent> <key> :<C-u>silent call Sum(visualmode())<CR>

" Usage:
"   <key>ip     Print the sum of the numbers that form the current paragraph
"               below said paragraph
"   vip<key>    Same, for the current selection

" Example:
" 749.78
" 893.35
" 5420.70
" 2967.32
" 671.40
"
" vip<key>
"
" 749.78
" 893.35
" 5420.70
" 2967.32
" 671.40
" 10700