;;; loadhist.el --- lisp functions for working with feature groups
-;; Copyright (C) 1995, 1998 Free Software Foundation, Inc.
+;; Copyright (C) 1995, 1998, 2000 Free Software Foundation, Inc.
;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
-;; Version: 1.0
+;; Maintainer: FSF
;; Keywords: internal
;; This file is part of GNU Emacs.
;;; Code:
-(defvar load-history-loaded nil
- "Non-nil means we have loaded the file `fns-VERSION.el' in `exec-directory'.
-That file records the part of `load-history' for preloaded files,
-which is cleared out before dumping to make Emacs smaller.")
-
-(defun symbol-file (sym)
- "Return the input source from which SYM was loaded.
-This is a file name, or nil if the source was a buffer with no associated file."
- (unless load-history-loaded
- (load (expand-file-name
- ;; fns-XX.YY.ZZ.el does not work on DOS filesystem.
- (convert-standard-filename (format "fns-%s.el" emacs-version))
- exec-directory)
- ;; The file name fns-%s.el already has a .el extension.
- nil nil t)
- (setq load-history-loaded t))
- (catch 'foundit
- (mapcar
- (function (lambda (x) (if (memq sym (cdr x)) (throw 'foundit (car x)))))
- load-history)
- nil))
-
(defun feature-symbols (feature)
- "Return the file and list of symbols associated with a given FEATURE."
+ "Return the file and list of definitions associated with FEATURE.
+The value is actually the element of `load-history'
+for the file that did (provide FEATURE)."
(catch 'foundit
- (mapcar
- (function (lambda (x)
- (if (member (cons 'provide feature) (cdr x))
- (throw 'foundit x))))
- load-history)
+ (mapc (lambda (x)
+ (if (member (cons 'provide feature) (cdr x))
+ (throw 'foundit x)))
+ load-history)
nil))
(defun feature-file (feature)
"Return the file name from which a given FEATURE was loaded.
Actually, return the load argument, if any; this is sometimes the name of a
-Lisp file without an extension. If the feature came from an eval-buffer on
-a buffer with no associated file, or an eval-region, return nil."
+Lisp file without an extension. If the feature came from an `eval-buffer' on
+a buffer with no associated file, or an `eval-region', return nil."
(if (not (featurep feature))
- (error "%s is not a currently loaded feature" (symbol-name feature))
+ (error "%S is not a currently loaded feature" feature)
(car (feature-symbols feature))))
(defun file-provides (file)
"Return the list of features provided by FILE."
- (let ((symbols (cdr (assoc file load-history))) (provides nil))
- (mapcar
- (function (lambda (x)
- (if (and (consp x) (eq (car x) 'provide))
- (setq provides (cons (cdr x) provides)))))
- symbols)
- provides
- ))
+ (let ((symbols (cdr (assoc file load-history)))
+ provides)
+ (mapc (lambda (x)
+ (if (and (consp x) (eq (car x) 'provide))
+ (setq provides (cons (cdr x) provides))))
+ symbols)
+ provides))
(defun file-requires (file)
"Return the list of features required by FILE."
- (let ((symbols (cdr (assoc file load-history))) (requires nil))
- (mapcar
- (function (lambda (x)
- (if (and (consp x) (eq (car x) 'require))
- (setq requires (cons (cdr x) requires)))))
- symbols)
- requires
- ))
-
-(defun file-set-intersect (p q)
- ;; Return the set intersection of two lists
+ (let ((symbols (cdr (assoc file load-history)))
+ requires)
+ (mapc (lambda (x)
+ (if (and (consp x) (eq (car x) 'require))
+ (setq requires (cons (cdr x) requires))))
+ symbols)
+ requires))
+
+(defsubst file-set-intersect (p q)
+ "Return the set intersection of two lists."
(let ((ret nil))
- (mapcar
- (function (lambda (x) (if (memq x q) (setq ret (cons x ret)))))
- p)
- ret
- ))
+ (dolist (x p ret)
+ (if (memq x q) (setq ret (cons x ret))))
+ ret))
(defun file-dependents (file)
"Return the list of loaded libraries that depend on FILE.
This can include FILE itself."
- (let ((provides (file-provides file)) (dependents nil))
- (mapcar
- (function (lambda (x)
- (if (file-set-intersect provides (file-requires (car x)))
- (setq dependents (cons (car x) dependents)))))
- load-history)
- dependents
- ))
+ (let ((provides (file-provides file))
+ (dependents nil))
+ (dolist (x load-history dependents)
+ (if (file-set-intersect provides (file-requires (car x)))
+ (setq dependents (cons (car x) dependents))))
+ dependents))
(defun read-feature (prompt)
"Read a feature name \(string\) from the minibuffer.
Prompt with PROMPT and completing from `features', and
return the feature \(symbol\)."
(intern (completing-read prompt
- (mapcar (function (lambda (feature)
- (list (symbol-name feature))))
+ (mapcar (lambda (feature)
+ (list (symbol-name feature)))
features)
nil t)))
(defvar loadhist-hook-functions
- '(after-change-function after-change-functions
-after-insert-file-functions auto-fill-function before-change-function
-before-change-functions blink-paren-function
-buffer-access-fontify-functions command-line-functions
-comment-indent-function kill-buffer-query-functions
-kill-emacs-query-functions lisp-indent-function
-redisplay-end-trigger-functions temp-buffer-show-function
-window-scroll-functions window-size-change-functions
-write-region-annotate-functions)
- "A list of special hooks from the `Standard Hooks' node of the Lisp manual.
+ '(after-change-functions
+ after-insert-file-functions auto-fill-function
+ before-change-functions blink-paren-function
+ buffer-access-fontify-functions command-line-functions
+ comment-indent-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-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
;;;###autoload
(defun unload-feature (feature &optional force)
"Unload the library that provided FEATURE, restoring all its autoloads.
-If the feature is required by any other loaded code, and optional FORCE
+If the feature is required by any other loaded code, and prefix arg FORCE
is nil, raise an error."
- (interactive (list (read-feature "Feature: ")))
+ (interactive (list (read-feature "Feature: ") current-prefix-arg))
(if (not (featurep feature))
(error "%s is not a currently loaded feature" (symbol-name feature)))
(if (not force)
(if (or (and (boundp x) ; Random hooks.
(consp (symbol-value x))
(string-match "-hooks?\\'" (symbol-name x)))
- (and (fboundp x) ; Known abnormal hooks etc.
+ (and (boundp x) ; Known abnormal hooks etc.
(memq x loadhist-hook-functions)))
- (mapcar (lambda (y) (remove-hook x y))
- (cdr flist))))))
- (mapcar
- (lambda (x)
+ (dolist (y (cdr flist))
+ (remove-hook x y))))))
+ (if (fboundp 'elp-restore-function) ; remove ELP stuff first
+ (dolist (elt (cdr flist))
+ (if (symbolp elt)
+ (elp-restore-function elt))))
+ (mapc
+ (lambda (x)
(cond ((stringp x) nil)
((consp x)
;; Remove any feature names that this file provided.
(if (eq (car x) 'provide)
- (setq features (delq (cdr x) features))))
- ((boundp x) (makunbound x))
- ((fboundp x)
- (fmakunbound x)
- (let ((aload (get x 'autoload)))
- (if aload (fset x (cons 'autoload aload)))))))
+ (setq features (delq (cdr x) features)))
+ (when (eq (car x) 'defvar)
+ ;; Kill local values as much as possible.
+ (dolist (buf (buffer-list))
+ (with-current-buffer buf
+ (kill-local-variable (cdr x))))
+ ;; Get rid of the default binding if we can.
+ (unless (local-variable-if-set-p (cdr x))
+ (makunbound (cdr x)))))
+ (t
+ (when (fboundp x)
+ (if (fboundp 'ad-unadvise)
+ (ad-unadvise x))
+ (fmakunbound x)
+ (let ((aload (get x 'autoload)))
+ (if aload (fset x (cons 'autoload aload))))))))
(cdr flist))
;; Delete the load-history element for this file.
(let ((elt (assoc file load-history)))