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(diff-latest-backup-file): Check for a file-name-handler and run it.

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This commit is contained in:
Roland McGrath 1994-03-02 10:27:36 +00:00
parent b8ca7cc378
commit 34c46d8756
1 changed files with 24 additions and 21 deletions
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45
lisp/diff.el
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@ -1,6 +1,6 @@
;;; diff.el --- Run `diff' in compilation-mode.
;; Copyright (C) 1992 Free Software Foundation, Inc.
;; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
;; Keywords: unix, tools
@ -254,26 +254,29 @@ The backup file is the first file given to `diff'."
(defun diff-latest-backup-file (fn) ; actually belongs into files.el
"Return the latest existing backup of FILE, or nil."
;; First try simple backup, then the highest numbered of the
;; numbered backups.
;; Ignore the value of version-control because we look for existing
;; backups, which maybe were made earlier or by another user with
;; a different value of version-control.
(setq fn (file-chase-links (expand-file-name fn)))
(or
(let ((bak (make-backup-file-name fn)))
(if (file-exists-p bak) bak))
(let* ((dir (file-name-directory fn))
(base-versions (concat (file-name-nondirectory fn) ".~"))
(bv-length (length base-versions)))
(concat dir
(car (sort
(file-name-all-completions base-versions dir)
;; bv-length is a fluid var for backup-extract-version:
(function
(lambda (fn1 fn2)
(> (backup-extract-version fn1)
(backup-extract-version fn2))))))))))
(let ((handler (find-file-name-handler fn)))
(if handler
(funcall handler fn)
;; First try simple backup, then the highest numbered of the
;; numbered backups.
;; Ignore the value of version-control because we look for existing
;; backups, which maybe were made earlier or by another user with
;; a different value of version-control.
(setq fn (file-chase-links (expand-file-name fn)))
(or
(let ((bak (make-backup-file-name fn)))
(if (file-exists-p bak) bak))
(let* ((dir (file-name-directory fn))
(base-versions (concat (file-name-nondirectory fn) ".~"))
(bv-length (length base-versions)))
(concat dir
(car (sort
(file-name-all-completions base-versions dir)
;; bv-length is a fluid var for backup-extract-version:
(function
(lambda (fn1 fn2)
(> (backup-extract-version fn1)
(backup-extract-version fn2))))))))))))
(provide 'diff)