Function: recode-file-name

recode-file-name is an interactive and byte-compiled function defined in files.el.gz.

Signature

(recode-file-name FILE CODING NEW-CODING &optional OK-IF-ALREADY-EXISTS)

Documentation

Change the encoding of FILE's name from CODING to NEW-CODING.

The value is a new name of FILE. Signals a file-already-exists error if a file of the new name already exists unless optional fourth argument OK-IF-ALREADY-EXISTS is non-nil. A number as fourth arg means request confirmation if the new name already exists. This is what happens in interactive use with M-x (execute-extended-command).

View in manual

Probably introduced at or before Emacs version 22.1.

Key Bindings

Source Code

;; Defined in /usr/src/emacs/lisp/files.el.gz
(defun recode-file-name (file coding new-coding &optional ok-if-already-exists)
  "Change the encoding of FILE's name from CODING to NEW-CODING.
The value is a new name of FILE.
Signals a `file-already-exists' error if a file of the new name
already exists unless optional fourth argument OK-IF-ALREADY-EXISTS
is non-nil.  A number as fourth arg means request confirmation if
the new name already exists.  This is what happens in interactive
use with \\[execute-extended-command]."
  (interactive
   (let ((default-coding (or file-name-coding-system
			     default-file-name-coding-system))
	 (filename (read-file-name "Recode filename: " nil nil t))
	 from-coding to-coding)
     (if (and default-coding
	      ;; We provide the default coding only when it seems that
	      ;; the filename is correctly decoded by the default
	      ;; coding.
	      (let ((charsets (find-charset-string filename)))
		(and (not (memq 'eight-bit-control charsets))
		     (not (memq 'eight-bit-graphic charsets)))))
	 (setq from-coding (read-coding-system
			    (format-prompt "Recode filename %s from"
                                           filename default-coding)
			    default-coding))
       (setq from-coding (read-coding-system
			  (format "Recode filename %s from: " filename))))

     ;; We provide the default coding only when a user is going to
     ;; change the encoding not from the default coding.
     (if (eq from-coding default-coding)
	 (setq to-coding (read-coding-system
			  (format "Recode filename %s from %s to: "
				  filename from-coding)))
       (setq to-coding (read-coding-system
			(format-prompt "Recode filename %s from %s to"
				       default-coding filename from-coding)
			default-coding)))
     (list filename from-coding to-coding)))

  (let* ((default-coding (or file-name-coding-system
			     default-file-name-coding-system))
	 ;; FILE should have been decoded by DEFAULT-CODING.
	 (encoded (encode-coding-string file default-coding))
	 (newname (decode-coding-string encoded coding))
	 (new-encoded (encode-coding-string newname new-coding))
	 ;; Suppress further encoding.
	 (file-name-coding-system nil)
	 (default-file-name-coding-system nil)
	 (locale-coding-system nil))
    (rename-file encoded new-encoded ok-if-already-exists)
    newname))