--- /dev/null
+;;; loadhist.el --- lisp functions for working with feature groups
+
+;; Copyright (C) 1995 Free Software Foundation, Inc.
+
+;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
+;; Version: 1.0
+;; Keywords: internal, dumped
+
+;; This file is part of XEmacs.
+
+;; XEmacs 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.
+
+;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the Free
+;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+;; 02111-1307, USA.
+
+;;; Synched up with: FSF 20.2.
+
+;;; Commentary:
+
+;; This file is dumped with XEmacs.
+
+;; These functions exploit the load-history system variable.
+;; Entry points include `unload-feature', `symbol-file', and `feature-file'.
+
+;;; Code:
+
+;; load-history is a list of entries that look like this:
+;; ("outline" outline-regexp ... (require . wid-edit) ... (provide . outline) ...)
+
+(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."
+ (interactive "SFind source file for symbol: ") ; XEmacs
+ (dolist (entry load-history)
+ (when (memq sym (cdr entry))
+ (return (car entry)))))
+
+(defun feature-symbols (feature)
+ "Return the file and list of symbols associated with a given FEATURE."
+ (let ((pair `(provide . ,feature)))
+ (dolist (entry load-history)
+ (when (member pair (cdr entry))
+ (return entry)))))
+
+(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."
+ (unless (featurep feature)
+ (error "%s is not a currently loaded feature" (symbol-name feature)))
+ (car (feature-symbols feature)))
+
+(defun file-symbols (file)
+ "Return the file and list of symbols associated with FILE.
+The file name in the returned list is the string used to load the file,
+and may not be the same string as FILE, but it will be equivalent."
+ (or (assoc file load-history)
+ (assoc (file-name-sans-extension file) load-history)
+ (assoc (concat file ".el") load-history)
+ (assoc (concat file ".elc") load-history)))
+
+(defun file-provides (file)
+ "Return the list of features provided by FILE."
+ (let ((provides nil))
+ (dolist (x (cdr (file-symbols file)))
+ (when (eq (car-safe x) 'provide)
+ (push (cdr x) provides)))
+ provides))
+
+(defun file-requires (file)
+ "Return the list of features required by FILE."
+ (let ((requires nil))
+ (dolist (x (cdr (file-symbols file)))
+ (when (eq (car-safe x) 'require)
+ (push (cdr x) requires)))
+ requires))
+
+(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))
+ (dolist (entry load-history)
+ (dolist (x (cdr entry))
+ (when (and (eq (car-safe x) 'require)
+ (memq (cdr-safe x) provides))
+ (push (car entry) dependents))))
+ dependents))
+
+;; FSFmacs
+;(defun read-feature (prompt)
+; "Read a feature name \(string\) from the minibuffer,
+;prompting with PROMPT and completing from `features', and
+;return the feature \(symbol\)."
+; (intern (completing-read prompt
+; (mapcar #'(lambda (feature)
+; (list (symbol-name feature)))
+; features)
+; nil t)))
+
+;; ;;;###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 "SFeature: ")
+ (unless (featurep feature)
+ (error "%s is not a currently loaded feature" (symbol-name feature)))
+ (when (not force)
+ (let* ((file (feature-file feature))
+ (dependents (delete file (copy-sequence (file-dependents file)))))
+ (when dependents
+ (error "Loaded libraries %s depend on %s"
+ (prin1-to-string dependents) file))))
+ (let* ((flist (feature-symbols feature))
+ (file (car flist)))
+ (flet ((reset-aload (x)
+ (let ((aload (get x 'autoload)))
+ (if aload (fset x (cons 'autoload aload))))))
+ (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))))
+ ((and (boundp x)
+ (fboundp x))
+ (makunbound x)
+ (fmakunbound x)
+ (reset-aload x))
+ ((boundp x)
+ (makunbound x))
+ ((fboundp x)
+ (fmakunbound x)
+ (reset-aload x))))
+ (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
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