When editing config files, you may need to frequently convert between yes and no settings.

With the following in your vimrc, you can press gy to toggle between the words shown in the script.

function s:ToggleYesNo()
  let w=expand("<cword>")
  if     w=="yes"    | let w="no"
  elseif w=="no"     | let w="yes"
  elseif w=="on"     | let w="off"
  elseif w=="off"    | let w="on"
  elseif w=="manual" | let w="auto"
  elseif w=="auto"   | let w="manual"
  else               | let w=""
  endif
  if w!=""
    exec "normal! \"_ciw\<C-R>=w\<CR>\<Esc>b"
  endif
endfunc
nnoremap gy :call <SID>ToggleYesNo()<CR>

This could be supplemented with:

  else
    let n=strpart(w,0,2)
    if n=="no"
      let w=strpart(w,2)
    else
      let w="no".w
    endif
  endif

Comments

Use

exec "normal! m`\"_ciw\<C-R>=w\<CR>\<Esc>``"

to preserve cursor position.

The function will print

:call <SNR>#_ToggleYesNo()

if you press gy on a non-listed word.

Use

nnoremap <silent> gy :call <SID>ToggleYesNo()<CR>

to prevent this behavior.