Re: Calling a vim9script function with a range

On 2025-07-21, 'Russell Shaw' via vim_use <[email protected]> wrote:
> Hi,
>
> In "Comment()", how can i tell if the mapping "\c" was called with a visual
> range or not ?
>
> I want to call "Comment()" only once, without resorting to a legacy function,
> and without resorting to an intermediate ex command.
>
> I want access to the first and last visual lines, or else the current line (for
> non-visual, first==last).
>
> ---------------------------------
> vim9script
>
> def g:Comment()
>    echo "a"
> enddef
>
> map \c :<C-U>call Comment()<CR>
> ---------------------------------

I have something like this in my vimrc:

    vim9script
    nnoremap <silent> Q :set opfunc=libtext#ToggleComment<cr>g@
    vnoremap <silent> Q <scriptcmd> libtext.ToggleComment(visualmode(), true)<cr>

Then, in autoload/libtext.vim:

    export def ToggleComment(visualMode: string, visual: bool = false)
      # Comment/uncomment a region of text. See also :help map-operator.
      #
      # visualMode: one of "line", "char", or "block". See :help g@.
      # visual: whether the function is called directly when in Visual mode (true)
      #         as opposed to being called via opfunc (false).
      var first: number
      var last:  number
    
      if visual
        var lnum1 = line("v")
        var lnum2 = line(".")
    
        if lnum1 < lnum2
          first = lnum1
          last  = lnum2
        else
          first = lnum2
          last  = lnum1
        endif
      else
        first = line("'[")
        last  = line("']")
      endif

      # Do something with getline(first, last)
    enddef

Depending on your goal, you may also want to look at Vim's comment
plugin at $VIMRUNTIME/pack/dist/opt/comment.

Hope this help,
Life.


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