Chef's attribute notation converter

.vimrc

let s:chef = {}

function! s:chef.convert_attr_notation() abort
  if !search('\>', 'bcnW')
    return
  endif

  let [bufnbr, lnum, col, offset] = getpos('.')
  let line = getline(lnum)

  if match(line, '\.') == -1
    return
  endif

  let sc = self.find_attr_pos()
  let ec = col
  let l = matchstr(line, printf('.*\%%<%dc', sc))
  let r = matchstr(line, printf('\%%>%dc.*', ec))
  let attrs = split(matchstr(line, printf('\%%%dc.\+\%%%dc', sc - 1, ec + 1)), '\.')

  let attr = attrs[0] . join(map(attrs[1:], '"[:".v:val."]"'), '')
  call setline(lnum, l . attr . r)
  call setpos('.', [bufnbr, lnum, len(l . attr) + 1, 0])
  execute 'startinsert'
endfunction

function! s:chef.find_attr_pos()
  let pos = searchpos('\(^\|\s\)', 'bnW')
  return pos[1] + 1
endfunction
command! ChefConvertAttrNotation call s:chef.convert_attr_notation()
inoremap <silent> <C-y>x <C-g>u<Esc>:ChefConvertAttrNotation<Cr>