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1 ;;; loadhist.el --- lisp functions for working with feature groups
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2 ;;; Copyright (C) 1995 Free Software Foundation, Inc.
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3
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4 ;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
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5 ;; Version: 1.0
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6 ;; Keywords: internal
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;;; Commentary:
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27
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28 ;; These functions exploit the load-history system variable.
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29 ;; Entry points include `unload-feature', `symbol-file', and `feature-file'.
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30
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31 ;;; Code:
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32
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33 (defun symbol-file (sym)
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34 "Return the input source from which SYM was loaded.
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35 This is a file name, or nil if the source was a buffer with no associated file."
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36 (catch 'foundit
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37 (mapcar
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38 (function (lambda (x) (if (memq sym (cdr x)) (throw 'foundit (car x)))))
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39 load-history)
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40 nil))
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41
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42 (defun feature-symbols (feature)
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43 "Return the file and list of symbols associated with a given FEATURE."
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44 (catch 'foundit
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45 (mapcar
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46 (function (lambda (x)
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47 (if (member (cons 'provide feature) (cdr x))
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48 (throw 'foundit x))))
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49 load-history)
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50 nil))
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51
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52 (defun feature-file (feature)
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53 "Return the file name from which a given FEATURE was loaded.
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54 Actually, return the load argument, if any; this is sometimes the name of a
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55 Lisp file without an extension. If the feature came from an eval-buffer on
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56 a buffer with no associated file, or an eval-region, return nil."
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57 (if (not (featurep feature))
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58 (error "%s is not a currently loaded feature" (symbol-name feature))
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59 (car (feature-symbols feature))))
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60
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61 (defun file-provides (file)
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62 "Return the list of features provided by FILE."
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63 (let ((symbols (cdr (assoc file load-history))) (provides nil))
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64 (mapcar
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65 (function (lambda (x)
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66 (if (and (consp x) (eq (car x) 'provide))
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67 (setq provides (cons (cdr x) provides)))))
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68 symbols)
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69 provides
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70 ))
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71
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72 (defun file-requires (file)
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73 "Return the list of features required by FILE."
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74 (let ((symbols (cdr (assoc file load-history))) (requires nil))
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75 (mapcar
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76 (function (lambda (x)
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77 (if (and (consp x) (eq (car x) 'require))
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78 (setq requires (cons (cdr x) requires)))))
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79 symbols)
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80 requires
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81 ))
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82
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83 (defun file-set-intersect (p q)
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84 ;; Return the set intersection of two lists
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85 (let ((ret nil))
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86 (mapcar
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87 (function (lambda (x) (if (memq x q) (setq ret (cons x ret)))))
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88 p)
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89 ret
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90 ))
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91
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92 (defun file-dependents (file)
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93 "Return the list of loaded libraries that depend on FILE.
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94 This can include FILE itself."
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95 (let ((provides (file-provides file)) (dependents nil))
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96 (mapcar
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97 (function (lambda (x)
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98 (if (file-set-intersect provides (file-requires (car x)))
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99 (setq dependents (cons (car x) dependents)))))
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100 load-history)
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101 dependents
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102 ))
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103
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104 ;;;###autoload
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105 (defun unload-feature (feature &optional force)
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106 "Unload the library that provided FEATURE, restoring all its autoloads.
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107 If the feature is required by any other loaded code, and optional FORCE
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108 is nil, raise an error."
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109 (interactive "SFeature: ")
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110 (if (not (featurep feature))
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111 (error "%s is not a currently loaded feature" (symbol-name feature)))
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112 (if (not force)
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113 (let* ((file (feature-file feature))
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114 (dependents (delete file (copy-sequence (file-dependents file)))))
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115 (if dependents
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116 (error "Loaded libraries %s depend on %s"
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117 (prin1-to-string dependents) file)
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118 )))
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119 (let* ((flist (feature-symbols feature)) (file (car flist)))
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120 (mapcar
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121 (function (lambda (x)
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122 (cond ((stringp x) nil)
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123 ((consp x)
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124 ;; Remove any feature names that this file provided.
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125 (if (eq (car x) 'provide)
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126 (setq features (delq (cdr x) features))))
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127 ((boundp x) (makunbound x))
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128 ((fboundp x)
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129 (fmakunbound x)
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130 (let ((aload (get x 'autoload)))
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131 (if aload (fset x (cons 'autoload aload))))))))
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132 (cdr flist))
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133 ;; Delete the load-history element for this file.
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134 (let ((elt (assoc file load-history)))
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135 (setq load-history (delq elt load-history)))))
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136
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137 (provide 'loadhist)
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138
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139 ;;; loadhist.el ends here
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