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1 ;;; cus-dep.el --- Find customization dependencies.
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2 ;;
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3 ;; Copyright (C) 1997 Free Software Foundation, Inc.
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4 ;;
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5 ;; Author: Per Abrahamsen <abraham@dina.kvl.dk>, then
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6 ;; Richar Stallman <rms@gnu.ai.mit.edu>, then
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7 ;; Hrvoje Niksic <hniksic@srce.hr> (rewritten for XEmacs)
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8 ;; Maintainer: Hrvoje Niksic <hniksic@srce.hr>
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9 ;; Keywords: internal
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10
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11 ;; This file is part of XEmacs.
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12
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13 ;; XEmacs is free software; you can redistribute it and/or modify
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14 ;; it under the terms of the GNU General Public License as published by
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15 ;; the Free Software Foundation; either version 2, or (at your option)
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16 ;; any later version.
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17
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18 ;; XEmacs is distributed in the hope that it will be useful,
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19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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21 ;; GNU General Public License for more details.
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22
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23 ;; You should have received a copy of the GNU General Public License
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24 ;; along with XEmacs; see the file COPYING. If not, write to the
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25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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26 ;; Boston, MA 02111-1307, USA.
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27
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28 ;;; Synched up with: Not synched with FSF.
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29
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30
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31 ;;; Commentary:
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32
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33 ;; This file generates the custom-load files, loaded by cus-load.el.
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34 ;; The only entry point is `Custom-make-dependencies'.
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35
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36 ;; It works by scanning all the `.el' files in a directory, and
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37 ;; evaluates any `defcustom', `defgroup', or `defface' expression that
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38 ;; it finds. The symbol changed by this expression is stored to a
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39 ;; hash table as the hash key, file name being the value.
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40
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41 ;; After all the files have been examined, custom-loads.el is
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42 ;; generated by mapping all the atoms, and seeing if any of them
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43 ;; contains a `custom-group' property. This property is a list whose
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44 ;; each element's car is the "child" group symbol. If that property
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45 ;; is in the hash-table, the file name will be looked up from the
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46 ;; hash-table, and added to cusload-file. Because the hash-table is
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47 ;; cleared whenever we process a new directory, we cannot get confused
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48 ;; by custom-loads from another directory, or from a previous
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49 ;; installation. This is also why it is perfectly safe to have old
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50 ;; custom-loads around, and have them loaded by `cus-load.el' (as
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51 ;; invoked by `cus-edit.el').
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52
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53 ;; A trivial, but useful optimization is that if cusload-file exists,
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54 ;; and no .el files in the directory are newer than cusload-file, it
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55 ;; will not be generated. This means that the directories where
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56 ;; nothing has changed will be skipped.
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57
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58 ;; The `custom-put' function, used by files generated by
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59 ;; `Custom-make-dependencies', is a specialized function that updates
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60 ;; a property (which must be a list of strings) with a new list of
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61 ;; strings, eliminating the duplicates. As it also adds an
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62 ;; appropriate entry to a custom hash-table, *do not* use it outside
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63 ;; of custom. Its inner workings can change anytime, without prior
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64 ;; notice. `custom-put' is defined in `cus-load.el'.
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65
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66 ;; Example:
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67
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68 ;; (custom-put 'foo 'custom-loads '("bar" "baz"))
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69 ;; (get 'foo 'custom-loads)
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70 ;; => ("bar" "baz")
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71 ;;
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72 ;; (custom-put 'foo 'custom-loads '("hmph" "baz" "quz"))
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73 ;; (get 'foo 'custom-loads)
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74 ;; => ("bar" "baz" "hmph" "qux")
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75
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76 ;; Obviously, this allows correct incremental loading of custom-load
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77 ;; files. This is not necessary under FSF (they use a simple `put'),
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78 ;; since they have only *one* file. With the advent of packages, we
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79 ;; cannot afford the same luxury.
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80
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81
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82 ;;; Code:
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83
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84 (require 'cl)
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85 (require 'widget)
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86 (require 'cus-face)
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87
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88 ;; Don't change this, unless you plan to change the code in
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89 ;; cus-start.el, too.
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90 (defconst cusload-base-file "custom-load.el")
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91
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92 ;; Be very careful when changing this function. It looks easy to
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93 ;; understand, but is in fact very easy to break. Be sure to read and
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94 ;; understand the commentary above!
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95
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96 ;;;###autoload
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97 (defun Custom-make-dependencies (&optional subdirs)
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98 "Extract custom dependencies from .el files in SUBDIRS.
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99 SUBDIRS is a list of directories. If it is nil, the command-line
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100 arguments are used. If it is a string, only that directory is
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101 processed. This function is especially useful in batch mode.
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102
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103 Batch usage: xemacs -batch -l cus-dep.el -f Custom-make-dependencies DIRS"
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104 (interactive "DDirectory: ")
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105 (and (stringp subdirs)
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106 (setq subdirs (list subdirs)))
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107 (or subdirs
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108 ;; Usurp the command-line-args
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109 (setq subdirs command-line-args-left
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110 command-line-args-left nil))
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111 (setq subdirs (mapcar #'expand-file-name subdirs))
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112 (with-temp-buffer
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113 (let ((enable-local-eval nil)
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114 (hash (make-hash-table :test 'eq)))
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115 (dolist (dir subdirs)
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116 (princ (format "Processing %s\n" dir))
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117 (let ((cusload-file (expand-file-name cusload-base-file dir))
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118 (files (directory-files dir t "\\`[^=].*\\.el\\'")))
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119 ;; A trivial optimization: if no file in the directory is
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120 ;; newer than custom-load.el, no need to do anything!
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121 (if (and (file-exists-p cusload-file)
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122 (dolist (file files t)
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123 (when (file-newer-than-file-p file cusload-file)
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124 (return nil))))
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125 (princ "(No changes need to be written)\n")
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126 ;; Process directory
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127 (dolist (file files)
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128 (when (file-exists-p file)
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129 (erase-buffer)
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130 (insert-file-contents file)
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131 (goto-char (point-min))
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132 (let ((name (file-name-sans-extension
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133 (file-name-nondirectory file))))
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134 ;; Search for defcustom/defface/defgroup
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135 ;; expressions, and evaluate them.
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136 (ignore-errors
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137 (while (re-search-forward
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138 "^(defcustom\\|^(defface\\|^(defgroup"
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139 nil t)
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140 (beginning-of-line)
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141 (let ((expr (read (current-buffer))))
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142 (eval expr)
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143 ;; Hash the file of the affected symbol.
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144 (setf (gethash (nth 1 expr) hash) name)))))))
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145 (cond
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146 ((zerop (hash-table-count hash))
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147 (princ "(No customization dependencies")
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148 (when (file-exists-p cusload-file)
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149 (princ (format ", deleting %s" cusload-file))
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150 (delete-file cusload-file))
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151 (princ ")\n"))
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152 (t
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153 (princ (format "Generating %s...\n" cusload-base-file))
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154 (with-temp-file cusload-file
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155 (insert ";;; " cusload-base-file
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156 " --- automatically extracted custom dependencies\n"
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157 "\n\n;;; Code:\n\n")
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158 (mapatoms
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159 (lambda (sym)
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160 (let ((members (get sym 'custom-group))
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161 item where found)
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162 (when members
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163 (while members
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164 (setq item (car (car members))
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165 members (cdr members)
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166 where (gethash item hash))
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167 (unless (or (null where)
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168 (member where found))
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169 (if found
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170 (insert " ")
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171 (insert "(custom-add-loads '"
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172 (symbol-name sym) " '("))
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173 (prin1 where (current-buffer))
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174 (push where found)))
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175 (when found
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176 (insert "))\n"))))))
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177 (insert "\n;;; custom-load.el ends here\n"))
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178 (clrhash hash)))))))))
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179
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180 (provide 'cus-dep)
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181
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182 ;;; cus-dep.el ends here
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