mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
5f15b2efed
instead of data-directory since it is architecture dependent. (load-history-loaded): Update doc string.
201 lines
7.4 KiB
EmacsLisp
201 lines
7.4 KiB
EmacsLisp
;;; loadhist.el --- lisp functions for working with feature groups
|
|
|
|
;; Copyright (C) 1995, 1998 Free Software Foundation, Inc.
|
|
|
|
;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
|
|
;; Version: 1.0
|
|
;; Keywords: internal
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; 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 2, 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
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; 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., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; These functions exploit the load-history system variable.
|
|
;; Entry points include `unload-feature', `symbol-file', and
|
|
;; `feature-file', documented in the Emacs Lisp manual.
|
|
|
|
;;; 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 (format "fns-%s.el" emacs-version)
|
|
exec-directory))
|
|
(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."
|
|
(catch 'foundit
|
|
(mapcar
|
|
(function (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."
|
|
(if (not (featurep feature))
|
|
(error "%s is not a currently loaded feature" (symbol-name 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
|
|
))
|
|
|
|
(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 ((ret nil))
|
|
(mapcar
|
|
(function (lambda (x) (if (memq x q) (setq ret (cons x ret)))))
|
|
p)
|
|
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
|
|
))
|
|
|
|
(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))))
|
|
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.
|
|
|
|
These are symbols with hook-type values whose names don't end in
|
|
`-hook' or `-hooks', from which `unload-feature' tries to remove
|
|
pertinent symbols.")
|
|
|
|
;;;###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
|
|
is nil, raise an error."
|
|
(interactive (list (read-feature "Feature: ")))
|
|
(if (not (featurep feature))
|
|
(error "%s is not a currently loaded feature" (symbol-name feature)))
|
|
(if (not force)
|
|
(let* ((file (feature-file feature))
|
|
(dependents (delete file (copy-sequence (file-dependents file)))))
|
|
(if dependents
|
|
(error "Loaded libraries %s depend on %s"
|
|
(prin1-to-string dependents) file))))
|
|
(let* ((flist (feature-symbols feature))
|
|
(file (car flist))
|
|
(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 defining `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)
|
|
(if (or (and (boundp x) ; Random hooks.
|
|
(consp (symbol-value x))
|
|
(string-match "-hooks?\\'" (symbol-name x)))
|
|
(and (fboundp x) ; Known abnormal hooks etc.
|
|
(memq x loadhist-hook-functions)))
|
|
(mapcar (lambda (y) (remove-hook x y))
|
|
(cdr flist))))))
|
|
(mapcar
|
|
(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)))))))
|
|
(cdr flist))
|
|
;; Delete the load-history element for this file.
|
|
(let ((elt (assoc file load-history)))
|
|
(setq load-history (delq elt load-history)))))
|
|
|
|
(provide 'loadhist)
|
|
|
|
;;; loadhist.el ends here
|