;;; loadhist.el --- lisp functions for working with feature groups
-;; Copyright (C) 1995, 1998, 2000, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007 Free Software Foundation, Inc.
+;; Copyright (C) 1995, 1998, 2000-2015 Free Software Foundation, Inc.
;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
-;; Maintainer: FSF
+;; Maintainer: emacs-devel@gnu.org
;; Keywords: internal
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 3, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
-(eval-when-compile (require 'cl))
-
(defun feature-symbols (feature)
"Return the file and list of definitions associated with FEATURE.
The value is actually the element of `load-history'
(let (provides)
(dolist (x (file-loadhist-lookup file) provides)
(when (eq (car-safe x) 'provide)
- (push x provides)))))
+ (push (cdr x) provides)))))
(defun file-requires (file)
"Return the list of features required by FILE as it was loaded.
(let (requires)
(dolist (x (file-loadhist-lookup file) requires)
(when (eq (car-safe x) 'require)
- (push x requires)))))
+ (push (cdr x) requires)))))
(defsubst file-set-intersect (p q)
"Return the set intersection of two lists."
"Read feature name from the minibuffer, prompting with string PROMPT.
If optional second arg LOADED-P is non-nil, the feature must be loaded
from a file."
- (intern
- (completing-read prompt
- (cons nil features)
- (and loaded-p
- #'(lambda (f)
- (and f ; ignore nil
- (feature-file f))))
- loaded-p)))
+ (intern (completing-read
+ prompt
+ (mapcar #'symbol-name
+ (if loaded-p
+ (delq nil
+ (mapcar
+ (lambda (x) (and (feature-file x) x))
+ features))
+ features)))))
(defvaralias 'loadhist-hook-functions 'unload-feature-special-hooks)
(defvar unload-feature-special-hooks
'(after-change-functions after-insert-file-functions
- after-make-frame-functions auto-fill-function before-change-functions
- blink-paren-function buffer-access-fontify-functions command-line-functions
+ after-make-frame-functions auto-coding-functions
+ auto-fill-function before-change-functions
+ blink-paren-function buffer-access-fontify-functions
+ choose-completion-string-functions
+ comint-output-filter-functions command-line-functions
comment-indent-function compilation-finish-functions
- disabled-command-function find-file-not-found-functions
- font-lock-beginning-of-syntax-function font-lock-fontify-buffer-function
- font-lock-fontify-region-function font-lock-mark-block-function
- font-lock-syntactic-face-function font-lock-unfontify-buffer-function
- font-lock-unfontify-region-function kill-buffer-query-functions
- kill-emacs-query-functions lisp-indent-function mouse-position-function
- redisplay-end-trigger-functions temp-buffer-show-function
- window-scroll-functions window-size-change-functions
- write-contents-functions write-file-functions
- write-region-annotate-functions)
+ delete-frame-functions disabled-command-function
+ fill-nobreak-predicate find-directory-functions
+ find-file-not-found-functions
+ font-lock-fontify-buffer-function
+ font-lock-fontify-region-function
+ font-lock-mark-block-function
+ font-lock-syntactic-face-function
+ font-lock-unfontify-buffer-function
+ font-lock-unfontify-region-function
+ kill-buffer-query-functions kill-emacs-query-functions
+ lisp-indent-function mouse-position-function
+ redisplay-end-trigger-functions suspend-tty-functions
+ temp-buffer-show-function window-scroll-functions
+ window-size-change-functions write-contents-functions
+ write-file-functions write-region-annotate-functions)
"A list of special hooks from Info node `(elisp)Standard Hooks'.
-These are symbols with hook-type values whose names don't end in
-`-hook' or `-hooks', from which `unload-feature' tries to remove
+These are symbols with hooklike values whose names don't end in
+`-hook' or `-hooks', from which `unload-feature' should try to remove
pertinent symbols.")
-(defvar unload-hook-features-list nil
- "List of features of the package being unloaded.
+(define-obsolete-variable-alias 'unload-hook-features-list
+ 'unload-function-defs-list "22.2")
+(defvar unload-function-defs-list nil
+ "List of definitions in the Lisp library being unloaded.
-This is meant to be used by FEATURE-unload-hook hooks, see the
+This is meant to be used by `FEATURE-unload-function'; see the
documentation of `unload-feature' for details.")
+(defun unload--set-major-mode ()
+ (save-current-buffer
+ (dolist (buffer (buffer-list))
+ (set-buffer buffer)
+ (let ((proposed major-mode))
+ ;; Look for a predecessor mode not defined in the feature we're processing
+ (while (and proposed (rassq proposed unload-function-defs-list))
+ (setq proposed (get proposed 'derived-mode-parent)))
+ (unless (eq proposed major-mode)
+ ;; Two cases: either proposed is nil, and we want to switch to fundamental
+ ;; mode, or proposed is not nil and not major-mode, and so we use it.
+ (funcall (or proposed 'fundamental-mode)))))))
+
;;;###autoload
(defun unload-feature (feature &optional force)
- "Unload the library that provided FEATURE, restoring all its autoloads.
+ "Unload the library that provided FEATURE.
If the feature is required by any other loaded code, and prefix arg FORCE
is nil, raise an error.
-This function tries to undo any modifications that the package has
-made to hook values in Emacs. Normally it does this using heuristics.
-The packages may define a hook `FEATURE-unload-hook'; if that exists,
-it is called instead of the normal heuristics.
+Standard unloading activities include restoring old autoloads for
+functions defined by the library, undoing any additions that the
+library has made to hook variables or to `auto-mode-alist', undoing
+ELP profiling of functions in that library, unproviding any features
+provided by the library, and canceling timers held in variables
+defined by the library.
+
+If a function `FEATURE-unload-function' is defined, this function
+calls it with no arguments, before doing anything else. That function
+can do whatever is appropriate to undo the loading of the library. If
+`FEATURE-unload-function' returns non-nil, that suppresses the
+standard unloading of the library. Otherwise the standard unloading
+proceeds.
-Such a hook should undo all the relevant global state changes that may
-have been made by loading the package or executing functions in it.
-It has access to the package's feature list (before anything is unbound)
-in the variable `unload-hook-features-list' and could remove features
-from it in the event that the package has done something strange,
-such as redefining an Emacs function."
+`FEATURE-unload-function' has access to the package's list of
+definitions in the variable `unload-function-defs-list' and could
+remove symbols from it in the event that the package has done
+something strange, such as redefining an Emacs function."
(interactive
(list
(read-feature "Unload feature: " t)
(when dependents
(error "Loaded libraries %s depend on %s"
(prin1-to-string dependents) file))))
- (let* ((unload-hook-features-list (feature-symbols feature))
- (file (pop unload-hook-features-list))
+ (let* ((unload-function-defs-list (feature-symbols feature))
+ (file (pop unload-function-defs-list))
;; If non-nil, this is a symbol for which we should
;; restore a previous autoload if possible.
restore-autoload
- (unload-hook (intern-soft (concat (symbol-name feature)
- "-unload-hook"))))
- ;; Try to avoid losing badly when hooks installed in critical
- ;; places go away. (Some packages install things on
- ;; `kill-buffer-hook', `activate-menubar-hook' and the like.)
- ;; First off, provide a clean way for package FOO to arrange
- ;; this by adding hooks on the variable `FOO-unload-hook'.
- (if unload-hook
- (run-hooks unload-hook)
- ;; Otherwise, do our best. Look through the obarray for symbols
- ;; which seem to be hook variables or special hook functions and
- ;; remove anything from them which matches the feature-symbols
- ;; about to get zapped. Obviously this won't get anonymous
- ;; functions which the package might just have installed, and
- ;; there might be other important state, but this tactic
- ;; normally works.
- (mapatoms
- (lambda (x)
- (when (and (boundp x)
- (or (and (consp (symbol-value x)) ; Random hooks.
- (string-match "-hooks?\\'" (symbol-name x)))
- (memq x unload-feature-special-hooks))) ; Known abnormal hooks etc.
- (dolist (y unload-hook-features-list)
- (when (and (eq (car-safe y) 'defun)
- (not (get (cdr y) 'autoload)))
- (remove-hook x (cdr y)))))))
- ;; Remove any feature-symbols from auto-mode-alist as well.
- (dolist (y unload-hook-features-list)
- (when (and (eq (car-safe y) 'defun)
- (not (get (cdr y) 'autoload)))
- (setq auto-mode-alist
- (rassq-delete-all (cdr y) auto-mode-alist)))))
- (when (fboundp 'elp-restore-function) ; remove ELP stuff first
- (dolist (elt unload-hook-features-list)
- (when (symbolp elt)
- (elp-restore-function elt))))
+ (name (symbol-name feature))
+ (unload-hook (intern-soft (concat name "-unload-hook")))
+ (unload-func (intern-soft (concat name "-unload-function"))))
+ ;; If FEATURE-unload-function is defined and returns non-nil,
+ ;; don't try to do anything more; otherwise proceed normally.
+ (unless (and (fboundp unload-func)
+ (funcall unload-func))
+ ;; Try to avoid losing badly when hooks installed in critical
+ ;; places go away. (Some packages install things on
+ ;; `kill-buffer-hook', `activate-menubar-hook' and the like.)
+ (if unload-hook
+ ;; First off, provide a clean way for package FOO to arrange
+ ;; this by adding hooks on the variable `FOO-unload-hook'.
+ ;; This is obsolete; FEATURE-unload-function should be used now.
+ (run-hooks unload-hook)
+ ;; Otherwise, do our best. Look through the obarray for symbols
+ ;; which seem to be hook variables or special hook functions and
+ ;; remove anything from them which matches the feature-symbols
+ ;; about to get zapped. Obviously this won't get anonymous
+ ;; functions which the package might just have installed, and
+ ;; there might be other important state, but this tactic
+ ;; normally works.
+ (mapatoms
+ (lambda (x)
+ (when (and (boundp x)
+ (or (and (consp (symbol-value x)) ; Random hooks.
+ (string-match "-hooks?\\'" (symbol-name x)))
+ (memq x unload-feature-special-hooks))) ; Known abnormal hooks etc.
+ (dolist (y unload-function-defs-list)
+ (when (and (eq (car-safe y) 'defun)
+ (not (get (cdr y) 'autoload)))
+ (remove-hook x (cdr y)))))))
+ ;; Remove any feature-symbols from auto-mode-alist as well.
+ (dolist (y unload-function-defs-list)
+ (when (and (eq (car-safe y) 'defun)
+ (not (get (cdr y) 'autoload)))
+ (setq auto-mode-alist
+ (rassq-delete-all (cdr y) auto-mode-alist)))))
+
+ ;; Change major mode in all buffers using one defined in the feature being unloaded.
+ (unload--set-major-mode)
+
+ (when (fboundp 'elp-restore-function) ; remove ELP stuff first
+ (dolist (elt unload-function-defs-list)
+ (when (symbolp elt)
+ (elp-restore-function elt))))
- (dolist (x unload-hook-features-list)
- (if (consp x)
- (case (car x)
- ;; Remove any feature names that this file provided.
- (provide
- (setq features (delq (cdr x) features)))
- ((defun autoload)
- (let ((fun (cdr x)))
- (when (fboundp fun)
- (when (fboundp 'ad-unadvise)
- (ad-unadvise fun))
- (let ((aload (get fun 'autoload)))
- (if (and aload (eq fun restore-autoload))
- (fset fun (cons 'autoload aload))
- (fmakunbound fun))))))
- ;; (t . SYMBOL) comes before (defun . SYMBOL)
- ;; and says we should restore SYMBOL's autoload
- ;; when we undefine it.
- ((t) (setq restore-autoload (cdr x)))
- ((require defface) nil)
- (t (message "Unexpected element %s in load-history" x)))
- ;; Kill local values as much as possible.
- (dolist (buf (buffer-list))
- (with-current-buffer buf
- (if (and (boundp x) (timerp (symbol-value x)))
- (cancel-timer (symbol-value x)))
- (kill-local-variable x)))
- (if (and (boundp x) (timerp (symbol-value x)))
- (cancel-timer (symbol-value x)))
- ;; Get rid of the default binding if we can.
- (unless (local-variable-if-set-p x)
- (makunbound x))))
- ;; Delete the load-history element for this file.
- (setq load-history (delq (assoc file load-history) load-history)))
+ (dolist (x unload-function-defs-list)
+ (if (consp x)
+ (pcase (car x)
+ ;; Remove any feature names that this file provided.
+ (`provide
+ (setq features (delq (cdr x) features)))
+ ((or `defun `autoload)
+ (let ((fun (cdr x)))
+ (when (fboundp fun)
+ (when (fboundp 'ad-unadvise)
+ (ad-unadvise fun))
+ (let ((aload (get fun 'autoload)))
+ (if (and aload (eq fun restore-autoload))
+ (fset fun (cons 'autoload aload))
+ (fmakunbound fun))))))
+ ;; (t . SYMBOL) comes before (defun . SYMBOL)
+ ;; and says we should restore SYMBOL's autoload
+ ;; when we undefine it.
+ (`t (setq restore-autoload (cdr x)))
+ ((or `require `defface) nil)
+ (_ (message "Unexpected element %s in load-history" x)))
+ ;; Kill local values as much as possible.
+ (dolist (buf (buffer-list))
+ (with-current-buffer buf
+ (if (and (boundp x) (timerp (symbol-value x)))
+ (cancel-timer (symbol-value x)))
+ (kill-local-variable x)))
+ (if (and (boundp x) (timerp (symbol-value x)))
+ (cancel-timer (symbol-value x)))
+ ;; Get rid of the default binding if we can.
+ (unless (local-variable-if-set-p x)
+ (makunbound x))))
+ ;; Delete the load-history element for this file.
+ (setq load-history (delq (assoc file load-history) load-history))))
;; Don't return load-history, it is not useful.
nil)
(provide 'loadhist)
-;; arch-tag: 70bb846a-c413-4f01-bf88-78dba4ac0798
;;; loadhist.el ends here