markdown-wordcount.vim

def <SID>wordcount(): string
    var cursor       = getcurpos()
    var current_word = 0
    var word_count   = 0

    var lnum  = 1
    for line in getline(1, '$')
        # We're at the line the cursor is on, get the current word.
        if lnum == cursor[1]
            # Start with the number of words already counted.
            current_word = word_count

            var col = 0
            # Split words by start-of-word; return value includes any non-word
            # characters too.
            for word in line->split('\<')
                # Contains 'isk'? This is a word! Skip if not.
                if word =~ '\k'
                   current_word += 1
                endif

                # Count word until we're beyond the cursor position.
                col += len(word)
                if col > cursor[2]
                    break
                endif
            endfor
        endif

        for word in line->split('')
            if word =~ '\k'
                word_count += 1
            endif
        endfor
        lnum += 1
    endfor

    return execute("normal! g\<C-g>")
        ->trim()
        ->substitute('Word \d\+ of \d\+', $'Word {current_word} of {word_count}', '')
enddef
augroup markdown-wordcount
    au!
    au filetype markdown nnoremap <buffer> <silent> g<C-g> :echo <SID>wordcount()<CR>
augroup end