ditz.vim

let s:commands = system('ditz --commands')

function! s:DitzComplete(cur, all, pos)
  let args = split(strpart(a:all, 0, a:pos), ' ', 1)

  if len(args) <= 2
    return s:commands
  elseif index(split(s:commands), args[1]) != -1
    return system('ditz '.args[1].' "<options>"')
  else
    return ''
  endif
endfunction

command! -nargs=+ -complete=custom,s:DitzComplete Ditz !ditz <args>