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(save-place-forget-unreadable-files)

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(save-place-save-skipped, save-place-skip-check-regexp): New defcustoms.
(save-place-forget-unreadable-files): New function.
(save-place-alist-to-file): Use it to filter out files that are
no longer readable.
This commit is contained in:
Eli Zaretskii 2004-02-21 14:07:11 +00:00
parent 235de37296
commit 467997b7f3
1 changed files with 63 additions and 0 deletions
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63
lisp/saveplace.el
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@ -94,6 +94,40 @@ value of `version-control'."
(const :tag "No Limit" nil))
:group 'save-place)
(defcustom save-place-forget-unreadable-files t
"Non-nil means forget place in unreadable files.
The filenames in `save-place-alist' that do not match
`save-place-skip-check-regexp' are filtered through
`file-readable-p'. if nil, their alist entries are removed.
You may do this anytime by calling the complementary function,
`save-place-forget-unreadable-files'. When this option is turned on,
this happens automatically before saving `save-place-alist' to
`save-place-file'."
:type 'boolean :group 'save-place)
(defcustom save-place-save-skipped t
"If non-nil, remember files matching `save-place-skip-check-regexp'.
When filtering `save-place-alist' for unreadable files, some will not
be checked, based on said regexp, and instead saved or forgotten based
on this flag."
:type 'boolean :group 'save-place)
(defcustom save-place-skip-check-regexp
;; thanks to ange-ftp-name-format
"\\`/\\(?:cdrom\\|floppy\\|mnt\\|\\(?:[^@/:]*@\\)?[^@/:]*[^@/:.]:\\)"
"Regexp whose file names shall not be checked for readability.
When forgetting unreadable files, file names matching this regular
expression shall not be checked for readability, but instead be
subject to `save-place-save-skipped'.
Files for which such a check may be inconvenient include those on
removable and network volumes."
:type 'regexp :group 'save-place)
(defun toggle-save-place (&optional parg)
"Toggle whether to save your place in this file between sessions.
If this mode is enabled, point is recorded when you kill the buffer
@ -138,12 +172,41 @@ To save places automatically in all files, put this in your `.emacs' file:
(cons (cons buffer-file-name position)
save-place-alist)))))))
(defun save-place-forget-unreadable-files ()
"Remove unreadable files from `save-place-alist'.
For each entry in the alist, if `file-readable-p' returns nil for the
filename, remove the entry. Save the new alist \(as the first pair
may have changed\) back to `save-place-alist'."
(interactive)
;; the following was adapted from an in-place filtering function,
;; `filter-mod', used in the original.
(unless (null save-place-alist) ;says it better than `when'
;; first, check all except first
(let ((fmprev save-place-alist) (fmcur (cdr save-place-alist)))
(while fmcur ;not null
;; a value is only saved when it becomes FMPREV.
(if (if (string-match save-place-skip-check-regexp (caar fmcur))
save-place-save-skipped
(file-readable-p (caar fmcur)))
(setq fmprev fmcur)
(setcdr fmprev (cdr fmcur)))
(setq fmcur (cdr fmcur))))
;; test first pair, keep it if OK, otherwise 2nd element, which
;; may be '()
(unless (if (string-match save-place-skip-check-regexp
(caar save-place-alist))
save-place-save-skipped
(file-readable-p (caar save-place-alist)))
(setq save-place-alist (cdr save-place-alist)))))
(defun save-place-alist-to-file ()
(let ((file (expand-file-name save-place-file)))
(save-excursion
(message "Saving places to %s..." file)
(set-buffer (get-buffer-create " *Saved Places*"))
(delete-region (point-min) (point-max))
(when save-place-forget-unreadable-files
(save-place-forget-unreadable-files))
(print save-place-alist (current-buffer))
(let ((version-control
(cond