Select lines using ranges in Vim

You basically already know the answer from here. It's quite easy to put this all together like this:

function insert_files() {
    vifm -f < /dev/tty > /dev/tty

    while read l; do
        LBUFFER+="'$l' "
    done < ~/.vifm/vimfiles

    zle reset-prompt
}
zle -N insert_files
bindkey '^t' insert_files

I'm not a zsh-user, so I stole structure of the code from answer by Lucas. As for bash, I was looking once for a way to process output of external command inside shortcut, but didn't find one.

P.S. My code contains quite primitive escaping, you might want to improve that and maybe change the way spacing is added between arguments.

Try adding this to your vimrc:

nmap <buffer> <silent> <expr> <F12> InsertCol()
imap <buffer> <silent> <expr> <F12> InsertCol()

function! InsertCol()
    let w:first_call = exists('w:first_call') ? 0 : 1
    "if w:first_call
    "    startinsert
    "endif
    try
        let char = getchar()
    catch /^Vim:Interrupt$/
        let char = "\<Esc>"
    endtry
    if char == '^\d\+$' || type(char) == 0
        let char = nr2char(char)
    endif " It is the ascii code.
    if char == "\<Esc>"
        unlet w:first_call
        return char
    endif
    redraw
    if w:first_call
        return char."\<Esc>gvA\<C-R>=Redraw()\<CR>\<F12>"
    else
        return char."\<Esc>gvlA\<C-R>=Redraw()\<CR>\<F12>"
    endif
endfunction

function! Redraw()
    redraw
    return ''
endfunction

Then press Ctrl-vI as usual, and then press F12. It will insert and show all lines changed for each keystroke.

Note: The script would be better if pressing F12 would go into insert mode, instead of requiring you to press I each time. Maybe the startinsert command in combination with vnoremap could do this.