function2寿.vim

au InsertLeave,CursorMovedI *.js call s:replaceFunctionKeyword2Kotobuki()
au BufWritePre,FileWritePre,FileAppendPre *.js call s:replaceAll('寿', 'function')
au BufRead,BufWritePost,FileWritePost,FileAppendPost *.js call s:replaceAll('function', '寿')

func! s:replaceFunctionKeyword2Kotobuki()
  let l:line_num = line(".")
  let l:line     = getline(l:line_num)

  if (l:line ==# '')
    let l:line_num -= 1
    let l:line = getline(l:line_num)
  endif
  call setline(l:line_num, substitute(getline(l:line_num), 'function', '寿', ''))
endfunc

func! s:replaceAll(from, to)
  let l:top_line    = line("w0")
  let l:bottom_line = line("w$")

  let l:current_line = l:top_line
  while l:current_line <= l:bottom_line
    call setline(l:current_line, substitute(getline(l:current_line), a:from, a:to, ''))
    let l:current_line += 1
  endwhile
endfunc