在vim map-operator函数中使用外部命令

Question

I'd like to create a vim mapping that allows for motions to control what text to output. There doesn't seem to be a whole lot of documentation on this and I'm having trouble adapting the sample in vim's help page to what I need. Here's what I have, which gives no errors but does not replace the text. What am I missing?

nmap ,s :set opfunc=CustomFunc<cr>g@

function! CustomFunc(type, ...)
    let sel_save = &selection
    let &selection = "inclusive"
    let reg_save = @@

    if a:type == 'line'
        silent exe "normal! '[V']!sort"
    elseif a:type == 'block'
        silent exe "normal! `[\<C-V>`]!sort"
    else
        silent exe "normal! `[v`]!sort"
    endif

    let &selection = sel_save
    let @@ = reg_save
endfunction

I used !sort as a very simple example for testing. The idea here is you could have a block like:

{
    Hello, World!
    Hello, Earth!
    Hello, Planet!
}

If you were to then move the cursor somewhere in the {} block and type ,si{ it would replace the block with

{
    Hello, Earth!
    Hello, Planet!
    Hello, World!
}

The workaround would be vi{:!sort<cr> , or if you have vmap ,s :!sort then vi{,s , but it would be nice to have this as an operator mapping (less typing, more flexible, etc).

Answer 1

I don't think external filtering with :! can ever be anything else then linewise.

If you require something like that, I think you need to resort to things like the system function and "manually" manipulate the buffer contents, instead of relying on Vim's filtering command.

And in the linewise case, the following, much simpler, incantation fixes it:

'[,']!sort

That is, instead of silent exe "normal! '[V']!sort" . I reckon the additional mode-switching implied with exec/ normal kills the operator-pending mode (?).

{
    Hello, World!
    Hello, Earth!
    Hello, Planet!
}

(cursor on W , type , S i B ):

{
    Hello, Earth!
    Hello, Planet!
    Hello, World!
}

Answer 2

Ex commands are always linewise, so it doesn't easily work what you want. There are some plugins, that help you with that (eg Dr. Chips VIS plugin or my NrrwRgn plugin. But I am not sure, if they help you in that particular case of omaps.