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428
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1 ;;; loadhist.el --- lisp functions for working with feature groups
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2
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3 ;; Copyright (C) 1995 Free Software Foundation, Inc.
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4
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5 ;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
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6 ;; Version: 1.0
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7 ;; Keywords: internal, dumped
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Synched up with: FSF 20.2.
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27
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28 ;;; Commentary:
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29
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30 ;; This file is dumped with XEmacs.
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31
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32 ;; These functions exploit the load-history system variable.
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33 ;; Entry points include `unload-feature', `symbol-file', and `feature-file'.
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34
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35 ;;; Code:
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36
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37 ;; load-history is a list of entries that look like this:
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38 ;; ("outline" outline-regexp ... (require . wid-edit) ... (provide . outline) ...)
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39
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40 (defun symbol-file (sym)
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41 "Return the input source from which SYM was loaded.
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42 This is a file name, or nil if the source was a buffer with no associated file."
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43 (interactive "SFind source file for symbol: ") ; XEmacs
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44 (dolist (entry load-history)
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45 (when (memq sym (cdr entry))
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46 (return (car entry)))))
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47
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48 (defun feature-symbols (feature)
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49 "Return the file and list of symbols associated with a given FEATURE."
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50 (let ((pair `(provide . ,feature)))
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51 (dolist (entry load-history)
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52 (when (member pair (cdr entry))
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53 (return entry)))))
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54
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55 (defun feature-file (feature)
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56 "Return the file name from which a given FEATURE was loaded.
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57 Actually, return the load argument, if any; this is sometimes the name of a
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58 Lisp file without an extension. If the feature came from an eval-buffer on
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59 a buffer with no associated file, or an eval-region, return nil."
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60 (unless (featurep feature)
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61 (error "%s is not a currently loaded feature" (symbol-name feature)))
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62 (car (feature-symbols feature)))
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63
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64 (defun file-symbols (file)
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65 "Return the file and list of symbols associated with FILE.
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66 The file name in the returned list is the string used to load the file,
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67 and may not be the same string as FILE, but it will be equivalent."
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68 (or (assoc file load-history)
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69 (assoc (file-name-sans-extension file) load-history)
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70 (assoc (concat file ".el") load-history)
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71 (assoc (concat file ".elc") load-history)))
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72
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73 (defun file-provides (file)
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74 "Return the list of features provided by FILE."
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75 (let ((provides nil))
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76 (dolist (x (cdr (file-symbols file)))
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77 (when (eq (car-safe x) 'provide)
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78 (push (cdr x) provides)))
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79 provides))
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80
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81 (defun file-requires (file)
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82 "Return the list of features required by FILE."
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83 (let ((requires nil))
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84 (dolist (x (cdr (file-symbols file)))
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85 (when (eq (car-safe x) 'require)
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86 (push (cdr x) requires)))
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87 requires))
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88
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89 (defun file-dependents (file)
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90 "Return the list of loaded libraries that depend on FILE.
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91 This can include FILE itself."
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92 (let ((provides (file-provides file))
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93 (dependents nil))
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94 (dolist (entry load-history)
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95 (dolist (x (cdr entry))
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96 (when (and (eq (car-safe x) 'require)
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97 (memq (cdr-safe x) provides))
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98 (push (car entry) dependents))))
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99 dependents))
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100
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101 ;; FSFmacs
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102 ;(defun read-feature (prompt)
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103 ; "Read a feature name \(string\) from the minibuffer,
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104 ;prompting with PROMPT and completing from `features', and
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105 ;return the feature \(symbol\)."
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106 ; (intern (completing-read prompt
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107 ; (mapcar #'(lambda (feature)
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108 ; (list (symbol-name feature)))
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109 ; features)
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110 ; nil t)))
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111
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112 ;; ;;;###autoload
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113 (defun unload-feature (feature &optional force)
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114 "Unload the library that provided FEATURE, restoring all its autoloads.
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115 If the feature is required by any other loaded code, and optional FORCE
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116 is nil, raise an error."
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117 (interactive "SFeature: ")
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118 (unless (featurep feature)
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119 (error "%s is not a currently loaded feature" (symbol-name feature)))
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120 (when (not force)
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121 (let* ((file (feature-file feature))
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122 (dependents (delete file (copy-sequence (file-dependents file)))))
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123 (when dependents
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124 (error "Loaded libraries %s depend on %s"
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125 (prin1-to-string dependents) file))))
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126 (let* ((flist (feature-symbols feature)) (file (car flist)))
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127 (mapcar
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128 #'(lambda (x)
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129 (cond ((stringp x) nil)
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130 ((consp x)
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131 ;; Remove any feature names that this file provided.
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132 (if (eq (car x) 'provide)
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133 (setq features (delq (cdr x) features))))
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134 ((boundp x) (makunbound x))
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135 ((fboundp x)
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136 (fmakunbound x)
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137 (let ((aload (get x 'autoload)))
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138 (if aload (fset x (cons 'autoload aload)))))))
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139 (cdr flist))
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140 ;; Delete the load-history element for this file.
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141 (let ((elt (assoc file load-history)))
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142 (setq load-history (delq elt load-history)))))
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143
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144 (provide 'loadhist)
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145
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146 ;;; loadhist.el ends here
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