--- Begin Message ---
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Subject: |
24.0.50; Can't revert diff-buffer-with-file |
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Date: |
Sun, 24 Oct 2010 16:30:17 -0400 |
The problem, of course, is that the temp file is deleted shortly
after "diff" exits, so the default revert-buffer function installed by
"diff" fails. The simplest solution seems to be to install a new
revert-buffer function that redoes the whole process of checking for a
file buffer and writing the temp file. The attached patch does a
minimal refactoring of "diff" and "diff-buffer-with-file" to do just
that, while trying to DTRT if the user renames the diff buffer or kills
the original buffer.
-- Bob Rogers
http://www.rgrjr.com/
diff --git a/lisp/files.el b/lisp/files.el
index d5f60b7..603c014 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -4512,24 +4512,42 @@ Before and after saving the buffer, this function runs
"View the differences between BUFFER and its associated file.
This requires the external program `diff' to be in your `exec-path'."
(interactive "bBuffer: ")
- (with-current-buffer (get-buffer (or buffer (current-buffer)))
+ (diff-buffer-internal (get-buffer (or buffer (current-buffer)))
+ (get-buffer-create "*Diff*"))
+ ;; return always nil, so that save-buffers-kill-emacs will not move
+ ;; over to the next unsaved buffer when calling `d'.
+ nil)
+
+(defvar diff-buffer-buffer) ;; suppress compiler warnings.
+
+(defun diff-buffer-internal (buffer result-buffer)
+ (if (not (and buffer (buffer-name buffer)))
+ (error "Original buffer deleted."))
+ (with-current-buffer buffer
(if (and buffer-file-name
(file-exists-p buffer-file-name))
(let ((tempfile (make-temp-file "buffer-content-")))
(unwind-protect
(progn
(write-region nil nil tempfile nil 'nomessage)
- (diff buffer-file-name tempfile nil t)
- (sit-for 0))
+ ;; No asynch so we don't delete the temp file prematurely.
+ (diff-into-buffer result-buffer buffer-file-name tempfile
+ nil t)
+ (sit-for 0)
+ ;; Now revise the revert-buffer-function, since the
+ ;; default will not be able to find the temp file.
+ (with-current-buffer result-buffer
+ (set (make-local-variable 'diff-buffer-buffer) buffer)
+ (setq revert-buffer-function
+ (lambda (ignore-auto noconfirm)
+ (diff-buffer-internal diff-buffer-buffer
+ (current-buffer))))))
(when (file-exists-p tempfile)
(delete-file tempfile))))
(message "Buffer %s has no associated file on disc" (buffer-name))
;; Display that message for 1 second so that user can read it
;; in the minibuffer.
- (sit-for 1)))
- ;; return always nil, so that save-buffers-kill-emacs will not move
- ;; over to the next unsaved buffer when calling `d'.
- nil)
+ (sit-for 1))))
(defvar save-some-buffers-action-alist
`((?\C-r
diff --git a/lisp/vc/diff.el b/lisp/vc/diff.el
index e79e72c..1a835b5 100644
--- a/lisp/vc/diff.el
+++ b/lisp/vc/diff.el
@@ -108,11 +108,16 @@ specified in `diff-switches' are passed to the diff
command."
(read-file-name "Diff original file: "
(file-name-directory newf) nil t)))
(list oldf newf (diff-switches))))
+ (diff-into-buffer nil old new switches no-async))
+
+(defun diff-into-buffer (buf old new &optional switches no-async)
+ ;; Noninteractive helper for creating and reverting diff buffers.
(setq new (expand-file-name new)
old (expand-file-name old))
(or switches (setq switches diff-switches)) ; If not specified, use default.
+ (or buf (setq buf (get-buffer-create "*Diff*")))
(let* ((old-alt (file-local-copy old))
- (new-alt (file-local-copy new))
+ (new-alt (file-local-copy new))
(command
(mapconcat 'identity
`(,diff-command
@@ -123,7 +128,6 @@ specified in `diff-switches' are passed to the diff
command."
,(shell-quote-argument (or old-alt old))
,(shell-quote-argument (or new-alt new)))
" "))
- (buf (get-buffer-create "*Diff*"))
(thisdir default-directory)
proc)
(save-excursion
--- End Message ---
--- Begin Message ---
|
Subject: |
Re: 24.0.50; Can't revert diff-buffer-with-file |
|
Date: |
Mon, 22 Nov 2010 14:22:22 -0500 |
|
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) |
> The attached patch does a minimal refactoring of "diff" and
> "diff-buffer-with-file" to do just that, while trying to DTRT if the
> user renames the diff buffer or kills the original buffer.
Thanks, installed.
Actually, I then started to take a closer look at the code and ended up
rewriting most of it to fix various problems. See patch below.
Stefan
=== modified file 'lisp/ChangeLog'
--- lisp/ChangeLog 2010-11-22 17:57:46 +0000
+++ lisp/ChangeLog 2010-11-22 19:19:24 +0000
@@ -1,3 +1,20 @@
+2010-11-22 Stefan Monnier <address@hidden>
+
+ * vc/diff.el (diff-old-temp-file, diff-new-temp-file): Remove.
+ (diff-sentinel): Get them as arguments instead.
+ (diff-old-file, diff-new-file, diff-extra-args): Remove.
+ (diff-file-local-copy, diff-better-file-name): New funs.
+ (diff-no-select): Rename from diff-into-buffer.
+ Support buffers additionally to files. Move `buf' arg. Don't display
buf.
+ Prefer closures to buffer-local variables.
+ (diff): Adjust accordingly.
+ (diff-buffer-with-file): Move from files.el.
+ * files.el (diff-buffer-with-file): Move to vc/diff.el.
+ (diff-buffer-internal): Remove.
+ (diff-buffer-buffer): Remove.
+ (save-some-buffers-action-alist): Use diff-no-select so as not to guess
+ the buffer name used, and so as not to mess up windows and frames.
+
2010-11-22 Bob Rogers <address@hidden>
* files.el: Make revert work with diff-buffer-with-file (bug#7277).
=== modified file 'lisp/files.el'
--- lisp/files.el 2010-11-22 17:57:46 +0000
+++ lisp/files.el 2010-11-22 19:13:31 +0000
@@ -4487,47 +4487,6 @@
(setq buffer-backed-up nil))))))
setmodes))
-(defun diff-buffer-with-file (&optional buffer)
- "View the differences between BUFFER and its associated file.
-This requires the external program `diff' to be in your `exec-path'."
- (interactive "bBuffer: ")
- (diff-buffer-internal (get-buffer (or buffer (current-buffer)))
- (get-buffer-create "*Diff*"))
- ;; return always nil, so that save-buffers-kill-emacs will not move
- ;; over to the next unsaved buffer when calling `d'.
- nil)
-
-(defvar diff-buffer-buffer) ;; suppress compiler warnings.
-
-(defun diff-buffer-internal (buffer result-buffer)
- (if (not (and buffer (buffer-name buffer)))
- (error "Original buffer deleted."))
- (with-current-buffer buffer
- (if (and buffer-file-name
- (file-exists-p buffer-file-name))
- (let ((tempfile (make-temp-file "buffer-content-")))
- (unwind-protect
- (progn
- (write-region nil nil tempfile nil 'nomessage)
- ;; No asynch so we don't delete the temp file prematurely.
- (diff-into-buffer result-buffer buffer-file-name tempfile
- nil t)
- (sit-for 0)
- ;; Now revise the revert-buffer-function, since the
- ;; default will not be able to find the temp file.
- (with-current-buffer result-buffer
- (set (make-local-variable 'diff-buffer-buffer) buffer)
- (setq revert-buffer-function
- (lambda (ignore-auto noconfirm)
- (diff-buffer-internal diff-buffer-buffer
- (current-buffer))))))
- (when (file-exists-p tempfile)
- (delete-file tempfile))))
- (message "Buffer %s has no associated file on disc" (buffer-name))
- ;; Display that message for 1 second so that user can read it
- ;; in the minibuffer.
- (sit-for 1))))
-
(defvar save-some-buffers-action-alist
`((?\C-r
,(lambda (buf)
@@ -4542,13 +4501,14 @@
(?d ,(lambda (buf)
(if (null (buffer-file-name buf))
(message "Not applicable: no file")
- (save-window-excursion (diff-buffer-with-file buf))
+ (require 'diff) ;for diff-no-select.
+ (let ((diffbuf (diff-no-select (buffer-file-name buf) buf
+ nil 'noasync)))
(if (not enable-recursive-minibuffers)
- (progn (display-buffer (get-buffer-create "*Diff*"))
- (setq other-window-scroll-buffer "*Diff*"))
- (view-buffer (get-buffer-create "*Diff*")
- (lambda (_) (exit-recursive-edit)))
- (recursive-edit)))
+ (progn (display-buffer diffbuf)
+ (setq other-window-scroll-buffer diffbuf))
+ (view-buffer diffbuf (lambda (_) (exit-recursive-edit)))
+ (recursive-edit))))
;; Return nil to ask about BUF again.
nil)
,(purecopy "view changes in this buffer")))
=== modified file 'lisp/vc/diff.el'
--- lisp/vc/diff.el 2010-11-22 17:57:46 +0000
+++ lisp/vc/diff.el 2010-11-22 19:19:14 +0000
@@ -31,6 +31,8 @@
;;; Code:
+(eval-when-compile (require 'cl))
+
(defgroup diff nil
"Comparing files with `diff'."
:group 'tools)
@@ -47,11 +49,6 @@
:type 'string
:group 'diff)
-(defvar diff-old-temp-file nil
- "This is the name of a temp file to be deleted after diff finishes.")
-(defvar diff-new-temp-file nil
- "This is the name of a temp file to be deleted after diff finishes.")
-
;; prompt if prefix arg present
(defun diff-switches ()
(if current-prefix-arg
@@ -60,12 +57,12 @@
diff-switches
(mapconcat 'identity diff-switches " ")))))
-(defun diff-sentinel (code)
+(defun diff-sentinel (code old-temp-file new-temp-file)
"Code run when the diff process exits.
CODE is the exit code of the process. It should be 0 only if no diffs
were found."
- (if diff-old-temp-file (delete-file diff-old-temp-file))
- (if diff-new-temp-file (delete-file diff-new-temp-file))
+ (if old-temp-file (delete-file old-temp-file))
+ (if new-temp-file (delete-file new-temp-file))
(save-excursion
(goto-char (point-max))
(let ((inhibit-read-only t))
@@ -75,10 +72,6 @@
(t ""))
(current-time-string))))))
-(defvar diff-old-file nil)
-(defvar diff-new-file nil)
-(defvar diff-extra-args nil)
-
;;;###autoload
(defun diff (old new &optional switches no-async)
"Find and display the differences between OLD and NEW files.
@@ -91,16 +84,15 @@
interactively for diff switches. Otherwise, the switches
specified in `diff-switches' are passed to the diff command."
(interactive
- (let (oldf newf)
- (setq newf (buffer-file-name)
- newf (if (and newf (file-exists-p newf))
+ (let ((newf (buffer-file-name))
+ (oldf (file-newest-backup newf)))
+ (setq newf (if (and newf (file-exists-p newf))
(read-file-name
(concat "Diff new file (default "
(file-name-nondirectory newf) "): ")
nil newf t)
(read-file-name "Diff new file: " nil nil t)))
- (setq oldf (file-newest-backup newf)
- oldf (if (and oldf (file-exists-p oldf))
+ (setq oldf (if (and oldf (file-exists-p oldf))
(read-file-name
(concat "Diff original file (default "
(file-name-nondirectory oldf) "): ")
@@ -108,63 +100,82 @@
(read-file-name "Diff original file: "
(file-name-directory newf) nil t)))
(list oldf newf (diff-switches))))
- (diff-into-buffer nil old new switches no-async))
+ (display-buffer
+ (diff-no-select old new switches no-async)))
-(defun diff-into-buffer (buf old new &optional switches no-async)
- ;; Noninteractive helper for creating and reverting diff buffers.
- (setq new (expand-file-name new)
- old (expand-file-name old))
+(defun diff-file-local-copy (file-or-buf)
+ (if (bufferp file-or-buf)
+ (with-current-buffer file-or-buf
+ (let ((tempfile (make-temp-file "buffer-content-")))
+ (write-region nil nil tempfile nil 'nomessage)
+ tempfile))
+ (file-local-copy file-or-buf)))
+
+(defun diff-better-file-name (file)
+ (if (bufferp file) file
+ (let ((rel (file-relative-name file))
+ (abbr (abbreviate-file-name (expand-file-name file))))
+ (if (< (length abbr) (length rel))
+ abbr
+ rel))))
+
+(defun diff-no-select (old new &optional switches no-async buf)
+ ;; Noninteractive helper for creating and reverting diff buffers
+ (setq new (diff-better-file-name new)
+ old (diff-better-file-name old))
(or switches (setq switches diff-switches)) ; If not specified, use default.
+ (unless (listp switches) (setq switches (list switches)))
(or buf (setq buf (get-buffer-create "*Diff*")))
- (let* ((old-alt (file-local-copy old))
- (new-alt (file-local-copy new))
+ (let* ((old-alt (diff-file-local-copy old))
+ (new-alt (diff-file-local-copy new))
(command
(mapconcat 'identity
`(,diff-command
;; Use explicitly specified switches
- ,@(if (listp switches) switches (list switches))
- ,@(if (or old-alt new-alt)
- (list "-L" old "-L" new))
- ,(shell-quote-argument (or old-alt old))
- ,(shell-quote-argument (or new-alt new)))
+ ,@switches
+ ,@(mapcar #'shell-quote-argument
+ (nconc
+ (when (or old-alt new-alt)
+ (list "-L" (if (stringp old)
+ old (prin1-to-string old))
+ "-L" (if (stringp new)
+ new (prin1-to-string new))))
+ (list (or old-alt old)
+ (or new-alt new)))))
" "))
- (thisdir default-directory)
- proc)
- (save-excursion
- (display-buffer buf)
- (set-buffer buf)
- (setq buffer-read-only nil)
+ (thisdir default-directory))
+ (with-current-buffer buf
+ (setq buffer-read-only t)
(buffer-disable-undo (current-buffer))
(let ((inhibit-read-only t))
(erase-buffer))
(buffer-enable-undo (current-buffer))
(diff-mode)
- ;; Use below 2 vars for backward-compatibility.
- (set (make-local-variable 'diff-old-file) old)
- (set (make-local-variable 'diff-new-file) new)
- (set (make-local-variable 'diff-extra-args) (list switches no-async))
(set (make-local-variable 'revert-buffer-function)
+ (lexical-let ((old old) (new new)
+ (switches switches)
+ (no-async no-async))
(lambda (ignore-auto noconfirm)
- (apply 'diff diff-old-file diff-new-file diff-extra-args)))
- (set (make-local-variable 'diff-old-temp-file) old-alt)
- (set (make-local-variable 'diff-new-temp-file) new-alt)
+ (diff-no-select old new switches no-async (current-buffer)))))
(setq default-directory thisdir)
(let ((inhibit-read-only t))
(insert command "\n"))
(if (and (not no-async) (fboundp 'start-process))
- (progn
- (setq proc (start-process "Diff" buf shell-file-name
- shell-command-switch command))
+ (let ((proc (start-process "Diff" buf shell-file-name
+ shell-command-switch command)))
(set-process-filter proc 'diff-process-filter)
+ (lexical-let ((old-alt old-alt) (new-alt new-alt))
(set-process-sentinel
proc (lambda (proc msg)
(with-current-buffer (process-buffer proc)
- (diff-sentinel (process-exit-status proc))))))
+ (diff-sentinel (process-exit-status proc)
+ old-alt new-alt))))))
;; Async processes aren't available.
(let ((inhibit-read-only t))
(diff-sentinel
(call-process shell-file-name nil buf nil
- shell-command-switch command)))))
+ shell-command-switch command)
+ old-alt new-alt))))
buf))
(defun diff-process-filter (proc string)
@@ -203,6 +214,14 @@
(funcall handler 'diff-latest-backup-file fn)
(file-newest-backup fn))))
+;;;###autoload
+(defun diff-buffer-with-file (&optional buffer)
+ "View the differences between BUFFER and its associated file.
+This requires the external program `diff' to be in your `exec-path'."
+ (interactive "bBuffer: ")
+ (with-current-buffer (get-buffer (or buffer (current-buffer)))
+ (diff buffer-file-name (current-buffer) nil 'noasync)))
+
(provide 'diff)
;; arch-tag: 7de2c29b-7ea5-4b85-9b9d-72dd860de2bd
--- End Message ---