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bug#20972: 25.0.50; eieio-persistent broken
From: |
Stefan Monnier |
Subject: |
bug#20972: 25.0.50; eieio-persistent broken |
Date: |
Sat, 04 Jul 2015 15:16:36 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
> ;; In theory, calling it like this should override the :file slot
> ;; defined in eieio-persistent
> (eieio-persistent-save (test-persist :slot "foo") "/tmp/test.eieio")
Indeed, the code seems completely broken in this respect (it mostly
ignores the `file' argument, tho not completely).
I'm not 100% sure what the code *should* do, but can you try the patch
below for you use case and confirm that it does the right thing for you?
Stefan
diff --git a/lisp/emacs-lisp/eieio-base.el b/lisp/emacs-lisp/eieio-base.el
index 2e28036..400bdb9 100644
--- a/lisp/emacs-lisp/eieio-base.el
+++ b/lisp/emacs-lisp/eieio-base.el
@@ -429,37 +429,28 @@ Optional argument COMMENT is a header line comment."
"Save persistent object THIS to disk.
Optional argument FILE overrides the file name specified in the object
instance."
- (save-excursion
- (let ((b (set-buffer (get-buffer-create " *tmp object write*")))
- (default-directory (file-name-directory (oref this file)))
- (cfn (oref this file)))
- (unwind-protect
- (save-excursion
- (erase-buffer)
- (let ((standard-output (current-buffer)))
- (oset this file
- (if file
- (eieio-persistent-path-relative this file)
- (file-name-nondirectory cfn)))
- (object-write this (oref this file-header-line)))
- (let ((backup-inhibited (not (oref this do-backups)))
- (cs (car (find-coding-systems-region
- (point-min) (point-max)))))
- (unless (eq cs 'undecided)
- (setq buffer-file-coding-system cs))
- ;; Old way - write file. Leaves message behind.
- ;;(write-file cfn nil)
-
- ;; New way - Avoid the vast quantities of error checking
- ;; just so I can get at the special flags that disable
- ;; displaying random messages.
- (write-region (point-min) (point-max)
- cfn nil 1)
- ))
- ;; Restore :file, and kill the tmp buffer
- (oset this file cfn)
- (setq buffer-file-name nil)
- (kill-buffer b)))))
+ (when file (setq file (expand-file-name file)))
+ (with-temp-buffer
+ (let* ((cfn (or file (oref this file)))
+ (default-directory (file-name-directory cfn)))
+ (cl-letf ((standard-output (current-buffer))
+ ((oref this file) ;FIXME: Why change it?
+ (if file
+ ;; FIXME: Makes a name relative to (oref this file),
+ ;; whereas I think it should be relative to cfn.
+ (eieio-persistent-path-relative this file)
+ (file-name-nondirectory cfn))))
+ (object-write this (oref this file-header-line)))
+ (let ((backup-inhibited (not (oref this do-backups)))
+ (coding-system-for-write 'utf-8-emacs))
+ ;; Old way - write file. Leaves message behind.
+ ;;(write-file cfn nil)
+
+ ;; New way - Avoid the vast quantities of error checking
+ ;; just so I can get at the special flags that disable
+ ;; displaying random messages.
+ (write-region (point-min) (point-max) cfn nil 1)
+ ))))
;; Notes on the persistent object:
;; It should also set up some hooks to help it keep itself up to date.