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+ − 1 ;;; loadhist.el --- lisp functions for working with feature groups
+ − 2
+ − 3 ;; Copyright (C) 1995 Free Software Foundation, Inc.
+ − 4
+ − 5 ;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
+ − 6 ;; Version: 1.0
+ − 7 ;; Keywords: internal, dumped
+ − 8
+ − 9 ;; This file is part of XEmacs.
+ − 10
+ − 11 ;; XEmacs is free software; you can redistribute it and/or modify it
+ − 12 ;; under the terms of the GNU General Public License as published by
+ − 13 ;; the Free Software Foundation; either version 2, or (at your option)
+ − 14 ;; any later version.
+ − 15
+ − 16 ;; XEmacs is distributed in the hope that it will be useful, but
+ − 17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
+ − 18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ − 19 ;; General Public License for more details.
+ − 20
+ − 21 ;; You should have received a copy of the GNU General Public License
+ − 22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
+ − 23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ − 24 ;; 02111-1307, USA.
+ − 25
+ − 26 ;;; Synched up with: FSF 20.2.
+ − 27
+ − 28 ;;; Commentary:
+ − 29
+ − 30 ;; This file is dumped with XEmacs.
+ − 31
+ − 32 ;; These functions exploit the load-history system variable.
+ − 33 ;; Entry points include `unload-feature', `symbol-file', and `feature-file'.
+ − 34
+ − 35 ;;; Code:
+ − 36
+ − 37 ;; load-history is a list of entries that look like this:
+ − 38 ;; ("outline" outline-regexp ... (require . wid-edit) ... (provide . outline) ...)
+ − 39
+ − 40 (defun symbol-file (sym)
+ − 41 "Return the input source from which SYM was loaded.
+ − 42 This is a file name, or nil if the source was a buffer with no associated file."
+ − 43 (interactive "SFind source file for symbol: ") ; XEmacs
+ − 44 (dolist (entry load-history)
+ − 45 (when (memq sym (cdr entry))
+ − 46 (return (car entry)))))
+ − 47
+ − 48 (defun feature-symbols (feature)
+ − 49 "Return the file and list of symbols associated with a given FEATURE."
+ − 50 (let ((pair `(provide . ,feature)))
+ − 51 (dolist (entry load-history)
+ − 52 (when (member pair (cdr entry))
+ − 53 (return entry)))))
+ − 54
+ − 55 (defun feature-file (feature)
+ − 56 "Return the file name from which a given FEATURE was loaded.
+ − 57 Actually, return the load argument, if any; this is sometimes the name of a
+ − 58 Lisp file without an extension. If the feature came from an eval-buffer on
+ − 59 a buffer with no associated file, or an eval-region, return nil."
+ − 60 (unless (featurep feature)
+ − 61 (error "%s is not a currently loaded feature" (symbol-name feature)))
+ − 62 (car (feature-symbols feature)))
+ − 63
+ − 64 (defun file-symbols (file)
+ − 65 "Return the file and list of symbols associated with FILE.
+ − 66 The file name in the returned list is the string used to load the file,
+ − 67 and may not be the same string as FILE, but it will be equivalent."
+ − 68 (or (assoc file load-history)
+ − 69 (assoc (file-name-sans-extension file) load-history)
+ − 70 (assoc (concat file ".el") load-history)
+ − 71 (assoc (concat file ".elc") load-history)))
+ − 72
+ − 73 (defun file-provides (file)
+ − 74 "Return the list of features provided by FILE."
+ − 75 (let ((provides nil))
+ − 76 (dolist (x (cdr (file-symbols file)))
+ − 77 (when (eq (car-safe x) 'provide)
+ − 78 (push (cdr x) provides)))
+ − 79 provides))
+ − 80
+ − 81 (defun file-requires (file)
+ − 82 "Return the list of features required by FILE."
+ − 83 (let ((requires nil))
+ − 84 (dolist (x (cdr (file-symbols file)))
+ − 85 (when (eq (car-safe x) 'require)
+ − 86 (push (cdr x) requires)))
+ − 87 requires))
+ − 88
+ − 89 (defun file-dependents (file)
+ − 90 "Return the list of loaded libraries that depend on FILE.
+ − 91 This can include FILE itself."
+ − 92 (let ((provides (file-provides file))
+ − 93 (dependents nil))
+ − 94 (dolist (entry load-history)
+ − 95 (dolist (x (cdr entry))
+ − 96 (when (and (eq (car-safe x) 'require)
+ − 97 (memq (cdr-safe x) provides))
+ − 98 (push (car entry) dependents))))
+ − 99 dependents))
+ − 100
+ − 101 ;; FSFmacs
+ − 102 ;(defun read-feature (prompt)
+ − 103 ; "Read a feature name \(string\) from the minibuffer,
+ − 104 ;prompting with PROMPT and completing from `features', and
+ − 105 ;return the feature \(symbol\)."
+ − 106 ; (intern (completing-read prompt
+ − 107 ; (mapcar #'(lambda (feature)
+ − 108 ; (list (symbol-name feature)))
+ − 109 ; features)
+ − 110 ; nil t)))
+ − 111
+ − 112 ;; ;;;###autoload
+ − 113 (defun unload-feature (feature &optional force)
+ − 114 "Unload the library that provided FEATURE, restoring all its autoloads.
+ − 115 If the feature is required by any other loaded code, and optional FORCE
+ − 116 is nil, raise an error."
+ − 117 (interactive "SFeature: ")
+ − 118 (unless (featurep feature)
+ − 119 (error "%s is not a currently loaded feature" (symbol-name feature)))
+ − 120 (when (not force)
+ − 121 (let* ((file (feature-file feature))
+ − 122 (dependents (delete file (copy-sequence (file-dependents file)))))
+ − 123 (when dependents
+ − 124 (error "Loaded libraries %s depend on %s"
+ − 125 (prin1-to-string dependents) file))))
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+ − 126 (let* ((flist (feature-symbols feature))
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+ − 127 (file (car flist))
+ − 128 (unloading-module nil))
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+ − 129 (flet ((reset-aload (x)
+ − 130 (let ((aload (get x 'autoload)))
+ − 131 (if aload (fset x (cons 'autoload aload))))))
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+ − 132 (mapcar
+ − 133 #'(lambda (x)
+ − 134 (cond ((stringp x) nil)
+ − 135 ((consp x)
+ − 136 ;; Remove any feature names that this file provided.
+ − 137 (if (eq (car x) 'provide)
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+ − 138 (setq features (delq (cdr x) features))
+ − 139 (if (eq (car x) 'module)
+ − 140 (setq unloading-module t))))
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+ − 141 ((and (boundp x)
+ − 142 (fboundp x))
+ − 143 (makunbound x)
+ − 144 (fmakunbound x)
+ − 145 (reset-aload x))
+ − 146 ((boundp x)
+ − 147 (makunbound x))
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+ − 148 ((fboundp x)
+ − 149 (fmakunbound x)
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+ − 150 (reset-aload x))))
+ − 151 (cdr flist)))
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+ − 152 ;; Delete the load-history element for this file.
+ − 153 (let ((elt (assoc file load-history)))
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+ − 154 (setq load-history (delq elt load-history)))
+ − 155 ;; If it is a module, really unload it.
+ − 156 (if unloading-module
+ − 157 (unload-module (symbol-name feature)))))
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+ − 158
+ − 159 (provide 'loadhist)
+ − 160
+ − 161 ;;; loadhist.el ends here
