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I'd like to have a mapping that separates words, like this:

noremap RJ :s/\>\s*\</\r/g<CR>=''

I can do 3RJ with that.

I can also create opfunc, so I can do RJ}:

noremap RJ :set opfunc=splitline#splitline<CR>g@

function! splitline#splitline(type) range abort
    execute line("'[") . ',' . line("']") . 's/\>\s*\</\r/g'
    let @/ = @"
    normal =''
endfunction

But how do I combine those two approaches together?

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Usually you would have a separate mapping for an operator that would work on the current line and take a count to work on a set of lines. For example, you could have RJ{motion} to act on a motion or text object, and RJJ to act on the current line or on a set of lines if given a count.

Having said that, you can have your mapping behave differently and act on a set of lines (possibly only one) when given a count, and expect a motion when not given one.

All you have to do is make it an <expr> mapping and then check whether v:count is larger than 0 to implement the first case.

You could duplicate the logic of :s/\>\s*\</\r/g to implement the case where a count is given, but perhaps easier is to set 'opfunc' unconditionally and then use g@_ for the case where you want to consider only the current line, or "n" lines when given a count.

(See :help _ for more information on the _ motion. The _ motion is typically equivalent to the double letter commands, e.g. yy is the same as y_, dd same as d_, cc same as c_ and so on. It's very useful to refer to the current line and work for "n" lines when given a count.)

Putting it all together:

function! splitline#setup_splitline()
    set opfunc=splitline#splitline
    if v:count > 0
        return 'g@' . v:count . '_'
    else
        return 'g@'
    endif
endfunction

nnoremap <expr> RJ splitline#setup_splitline()

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