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ファイル更新の監視 (Nested Flatten)
EmacsLisp です :-)
毎秒、更新時刻を比較します。
(setq filename "hoge") などとして、M-x watch-modification で起動してください。
変数 filename がセットされてないなら、ファイル名を聞いてくるので指定してください。
キャンセルするには、M-x watch-modification-cancel です。
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(defvar watch-modification-repeat-sec 1.0)
(defvar watch-modification-timer nil)
(defvar watch-modification-stack nil)
(defvar watch-modification-buffer "*watch*")

(defun watch-modification ()
  (interactive)
  (let ((file (or (and (boundp 'filename) filename)
		  (read-file-name "File: "))))
    (unless (string= file "")
      (watch-modification-cancel)
      (setq watch-modification-timer
	    (run-with-timer 1 watch-modification-repeat-sec
			    'watch-modification-function file)))))

(defun watch-modification-cancel ()
  (interactive)
  (when watch-modification-timer
    (cancel-timer watch-modification-timer))
  (setq watch-modification-timer nil
	watch-modification-stack nil))

(defun watch-modification-function (file)
  (let ((modified-time (nth 5 (file-attributes file))))
    (if (null watch-modification-stack)
        (push modified-time watch-modification-stack)
      (unless (equal modified-time (car watch-modification-stack))
	(push modified-time watch-modification-stack)
	(save-selected-window
	  (pop-to-buffer
	   (set-buffer (get-buffer-create watch-modification-buffer)))
	  (insert "modified!\n"))))))

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