emacs / elisp选择带有dired / file对话框的文件，然后执行操作？

Question

I want to write code so that the use can select a file for an operation using dired or some other file dialog, NOT the minibuffer. Eg he invokes a "Get files statistics" command, dired comes up, he chooses, and the stats appear. (This becomes much more interesting find-dired.)

But the two ways I can see of doing this - launching a dired with an altered keymap so that selecting a file invokes a fn to finish the command, and supplying after advice to dired-find-file - seem odd for what I thought would be a common task. Am I missing something?

Answer 1

Why not leave popping-up Dired out of it, and let users do that themselves?

Just bind a key in dired-mode-map that acts on the marked files (or the current file if none marked), performing whatever action you like (eg, show stats).

That's the typical Dired approach to this kind of thing, and the Dired code offers you all of the building blocks you need to do this easily -- in particular, dired-get-marked-files . See the code for the many dired-do-* commands defined in dired-aux.el , for examples.

For example:

(defun my-dired-do-stats (&optional arg)
  "Do stats for the marked files."
  (interactive "P")
  (dolist (file  (dired-get-marked-files nil arg))
    (my-stats-function file))))