|
233
|
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 (defun symbol-file (sym)
|
|
|
38 "Return the input source from which SYM was loaded.
|
|
|
39 This is a file name, or nil if the source was a buffer with no associated file."
|
|
|
40 (interactive "S") ; XEmacs
|
|
|
41 (catch 'foundit
|
|
|
42 (mapcar
|
|
|
43 (function (lambda (x) (if (memq sym (cdr x)) (throw 'foundit (car x)))))
|
|
|
44 load-history)
|
|
|
45 nil))
|
|
|
46
|
|
|
47 (defun feature-symbols (feature)
|
|
|
48 "Return the file and list of symbols associated with a given FEATURE."
|
|
|
49 (catch 'foundit
|
|
|
50 (mapcar
|
|
|
51 (function (lambda (x)
|
|
|
52 (if (member (cons 'provide feature) (cdr x))
|
|
|
53 (throw 'foundit x))))
|
|
|
54 load-history)
|
|
|
55 nil))
|
|
|
56
|
|
|
57 (defun feature-file (feature)
|
|
|
58 "Return the file name from which a given FEATURE was loaded.
|
|
|
59 Actually, return the load argument, if any; this is sometimes the name of a
|
|
|
60 Lisp file without an extension. If the feature came from an eval-buffer on
|
|
|
61 a buffer with no associated file, or an eval-region, return nil."
|
|
|
62 (if (not (featurep feature))
|
|
|
63 (error "%s is not a currently loaded feature" (symbol-name feature))
|
|
|
64 (car (feature-symbols feature))))
|
|
|
65
|
|
|
66 (defun file-provides (file)
|
|
|
67 "Return the list of features provided by FILE."
|
|
|
68 (let ((symbols (cdr (assoc file load-history))) (provides nil))
|
|
|
69 (mapcar
|
|
|
70 (function (lambda (x)
|
|
|
71 (if (and (consp x) (eq (car x) 'provide))
|
|
|
72 (setq provides (cons (cdr x) provides)))))
|
|
|
73 symbols)
|
|
|
74 provides
|
|
|
75 ))
|
|
|
76
|
|
|
77 (defun file-requires (file)
|
|
|
78 "Return the list of features required by FILE."
|
|
|
79 (let ((symbols (cdr (assoc file load-history))) (requires nil))
|
|
|
80 (mapcar
|
|
|
81 (function (lambda (x)
|
|
|
82 (if (and (consp x) (eq (car x) 'require))
|
|
|
83 (setq requires (cons (cdr x) requires)))))
|
|
|
84 symbols)
|
|
|
85 requires
|
|
|
86 ))
|
|
|
87
|
|
|
88 (defun file-set-intersect (p q)
|
|
|
89 ;; Return the set intersection of two lists
|
|
|
90 (let ((ret nil))
|
|
|
91 (mapcar
|
|
|
92 (function (lambda (x) (if (memq x q) (setq ret (cons x ret)))))
|
|
|
93 p)
|
|
|
94 ret
|
|
|
95 ))
|
|
|
96
|
|
|
97 (defun file-dependents (file)
|
|
|
98 "Return the list of loaded libraries that depend on FILE.
|
|
|
99 This can include FILE itself."
|
|
|
100 (let ((provides (file-provides file)) (dependents nil))
|
|
|
101 (mapcar
|
|
|
102 (function (lambda (x)
|
|
|
103 (if (file-set-intersect provides (file-requires (car x)))
|
|
|
104 (setq dependents (cons (car x) dependents)))))
|
|
|
105 load-history)
|
|
|
106 dependents
|
|
|
107 ))
|
|
|
108
|
|
|
109 ;; FSFmacs
|
|
|
110 ;(defun read-feature (prompt)
|
|
|
111 ; "Read a feature name \(string\) from the minibuffer,
|
|
|
112 ;prompting with PROMPT and completing from `features', and
|
|
|
113 ;return the feature \(symbol\)."
|
|
|
114 ; (intern (completing-read prompt
|
|
|
115 ; (mapcar (function (lambda (feature)
|
|
|
116 ; (list (symbol-name feature))))
|
|
|
117 ; features)
|
|
|
118 ; nil t)))
|
|
|
119
|
|
|
120 ;; ;;;###autoload
|
|
|
121 (defun unload-feature (feature &optional force)
|
|
|
122 "Unload the library that provided FEATURE, restoring all its autoloads.
|
|
|
123 If the feature is required by any other loaded code, and optional FORCE
|
|
|
124 is nil, raise an error."
|
|
|
125 (interactive "SFeature: ")
|
|
|
126 (if (not (featurep feature))
|
|
|
127 (error "%s is not a currently loaded feature" (symbol-name feature)))
|
|
|
128 (if (not force)
|
|
|
129 (let* ((file (feature-file feature))
|
|
|
130 (dependents (delete file (copy-sequence (file-dependents file)))))
|
|
|
131 (if dependents
|
|
|
132 (error "Loaded libraries %s depend on %s"
|
|
|
133 (prin1-to-string dependents) file)
|
|
|
134 )))
|
|
|
135 (let* ((flist (feature-symbols feature)) (file (car flist)))
|
|
|
136 (mapcar
|
|
|
137 (function (lambda (x)
|
|
|
138 (cond ((stringp x) nil)
|
|
|
139 ((consp x)
|
|
|
140 ;; Remove any feature names that this file provided.
|
|
|
141 (if (eq (car x) 'provide)
|
|
|
142 (setq features (delq (cdr x) features))))
|
|
|
143 ((boundp x) (makunbound x))
|
|
|
144 ((fboundp x)
|
|
|
145 (fmakunbound x)
|
|
|
146 (let ((aload (get x 'autoload)))
|
|
|
147 (if aload (fset x (cons 'autoload aload))))))))
|
|
|
148 (cdr flist))
|
|
|
149 ;; Delete the load-history element for this file.
|
|
|
150 (let ((elt (assoc file load-history)))
|
|
|
151 (setq load-history (delq elt load-history)))))
|
|
|
152
|
|
|
153 (provide 'loadhist)
|
|
|
154
|
|
|
155 ;;; loadhist.el ends here
|
