区分文件与扩展名，隐藏文件和扩展名 [英] Distinguishing files with extensions, from hidden files and no extensions

问题描述

我难以将文件与扩展名区分开来，不需要扩展名的文件和隐藏的文件。我在dired模式下使用（文件扩展名（dired-get-file-for-visit）），文件扩展名的类型决定了采取 - 例如，在Emacs中打开，或者在特定应用程序外部打开。

I'm having difficulty distinguishing files with extensions, from files without extensions, and hidden files. I'm using (file-name-extension (dired-get-file-for-visit)) in dired-mode, and the type of file extension determines what action to take -- e.g., open in Emacs, or open externally with a particular application.

隐藏文件（例如 .hidden ）返回值 nil ，而不是隐藏。

A hidden file (e.g., .hidden) returns a value of nil instead of "hidden".

具有不扩展名的文件（例如， foo ）也返回值 nil 。

A file with no extension (e.g., foo) also returns a value of nil.

任何人都可以提出替代方法来处理这个问题？

Can anyone suggest an alternative method to handle this?

(let* (
    (input-regexp '("odt" "wpd" "docx" "doc" "xls" "pdf" "tif" "bmp" "jpg"))
    (input-filename (dired-get-file-for-visit)) )
  (if (not (regexp-match-p input-regexp (file-name-extension input-filename))))
    (find-file input-filename) )

;; https://github.com/kentaro/auto-save-buffers-enhanced
(defun regexp-match-p (regexps string)
  (catch 'matched
    (dolist (regexp regexps)
      (if (string-match regexp string)
        (throw 'matched t)))))

这是调试器（部分）：

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  string-match("odt" nil)
  (if (string-match regexp string) (throw (quote matched) t))
  (while --dolist-tail-- (setq regexp (car --dolist-tail--)) (if (string-match regexp string) (throw (quote matched) t)) (setq --dolist-tail-- (cdr --dolist-tail--)))
  (let ((--dolist-tail-- regexps) regexp) (while --dolist-tail-- (setq regexp (car --dolist-tail--)) (if (string-match regexp string) (throw (quote matched) t)) (setq --dolist-tail-- (cdr --dolist-tail--))))
  (progn (let ((--dolist-tail-- regexps) regexp) (while --dolist-tail-- (setq regexp (car --dolist-tail--)) (if (string-match regexp string) (throw (quote matched) t)) (setq --dolist-tail-- (cdr --dolist-tail--)))))
  (catch (quote matched) (progn (let ((--dolist-tail-- regexps) regexp) (while --dolist-tail-- (setq regexp (car --dolist-tail--)) (if (string-match regexp string) (throw (quote matched) t)) (setq --dolist-tail-- (cdr --dolist-tail--))))))
  regexp-match-p(("odt" "wpd" "docx" "doc" "xls" "pdf" "tif" "bmp" "jpg") nil)
  (not (regexp-match-p input-regexp (file-name-extension input-filename)))
***

推荐答案

(let* ((input-regexp '("odt" "wpd" "docx" "doc" "xls" "pdf" "tif" "bmp" "jpg"))
       (input-filename (dired-get-file-for-visit))
       (ext (file-name-extension input-filename)))
  (unless (and ext (regexp-match-p input-regexp ext))
    (find-file input-filename)))

或者，重新定义

(defun regexp-match-p (regexps string)
  (and string
       (catch 'matched
         (let ((inhibit-changing-match-data t)) ; small optimization
           (dolist (regexp regexps)
             (when (string-match regexp string)
               (throw 'matched t)))))))

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