;;; cus-dep.el --- Find customization dependencies.
;; Copyright (C) 1997 Free Software Foundation, Inc.
;; Author: Per Abrahamsen <firstname.lastname@example.org>, then
;; Richard Stallman <email@example.com>, then
;; Hrvoje Niksic <firstname.lastname@example.org> (rewritten for XEmacs)
;; Maintainer: Hrvoje Niksic <email@example.com>
;; Keywords: internal
;; This file is part of XEmacs.
;; XEmacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; XEmacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with XEmacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Synched up with: Not synched with FSF.
;; This file generates the custom-load files, loaded by cus-load.el.
;; The only entry point is `Custom-make-dependencies'.
;; It works by scanning all the `.el' files in a directory, and
;; evaluates any `defcustom', `defgroup', or `defface' expression that
;; it finds. The symbol changed by this expression is stored to a
;; hash table as the hash key, file name being the value.
;; After all the files have been examined, custom-loads.el is
;; generated by mapping all the atoms, and seeing if any of them
;; contains a `custom-group' property. This property is a list whose
;; each element's car is the "child" group symbol. If that property
;; is in the hash-table, the file name will be looked up from the
;; hash-table, and added to cusload-file. Because the hash-table is
;; cleared whenever we process a new directory, we cannot get confused
;; by custom-loads from another directory, or from a previous
;; installation. This is also why it is perfectly safe to have old
;; custom-loads around, and have them loaded by `cus-load.el' (as
;; invoked by `cus-edit.el').
;; A trivial, but useful optimization is that if cusload-file exists,
;; and no .el files in the directory are newer than cusload-file, it
;; will not be generated. This means that the directories where
;; nothing has changed will be skipped.
;; The `custom-put' function, used by files generated by
;; `Custom-make-dependencies', is a specialized function that updates
;; a property (which must be a list of strings) with a new list of
;; strings, eliminating the duplicates. As it also adds an
;; appropriate entry to a custom hash-table, *do not* use it outside
;; of custom. Its inner workings can change anytime, without prior
;; notice. `custom-put' is defined in `cus-load.el'.
;; (custom-put 'foo 'custom-loads '("bar" "baz"))
;; (get 'foo 'custom-loads)
;; => ("bar" "baz")
;; (custom-put 'foo 'custom-loads '("hmph" "baz" "quz"))
;; (get 'foo 'custom-loads)
;; => ("bar" "baz" "hmph" "qux")
;; Obviously, this allows correct incremental loading of custom-load
;; files. This is not necessary under FSF (they use a simple `put'),
;; since they have only *one* file. With the advent of packages, we
;; cannot afford the same luxury.
;; Don't change this, unless you plan to change the code in
;; cus-start.el, too.
(defconst cusload-base-file "custom-load.el")
;; Be very careful when changing this function. It looks easy to
;; understand, but is in fact very easy to break. Be sure to read and
;; understand the commentary above!
(defun Custom-make-dependencies (&optional subdirs)
"Extract custom dependencies from .el files in SUBDIRS.
SUBDIRS is a list of directories. If it is nil, the command-line
arguments are used. If it is a string, only that directory is
processed. This function is especially useful in batch mode.
Batch usage: xemacs -batch -l cus-dep.el -f Custom-make-dependencies DIRS"
(interactive "DDirectory: ")
(and (stringp subdirs)
(setq subdirs (list subdirs)))
;; Usurp the command-line-args
(setq subdirs command-line-args-left
(setq subdirs (mapcar #'expand-file-name subdirs))
(let ((enable-local-eval nil)
(hash (make-hash-table :test 'eq)))
(dolist (dir subdirs)
(princ (format "Processing %s\n" dir))
(let ((cusload-file (expand-file-name cusload-base-file dir))
(files (directory-files dir t "\\`[^=].*\\.el\\'")))
;; A trivial optimization: if no file in the directory is
;; newer than custom-load.el, no need to do anything!
(if (and (file-exists-p cusload-file)
(dolist (file files t)
(when (file-newer-than-file-p file cusload-file)
(princ "(No changes need to be written)\n")
;; Process directory
(dolist (file files)
(when (file-exists-p file)
(let ((name (file-name-sans-extension
;; Search for defcustom/defface/defgroup
;; expressions, and evaluate them.
(let ((expr (read (current-buffer))))
;; Hash the file of the affected symbol.
(setf (gethash (nth 1 expr) hash) name)))))))
((zerop (hash-table-count hash))
(princ "(No customization dependencies")
(when (file-exists-p cusload-file)
(princ (format ", deleting %s" cusload-file))
(princ (format "Generating %s...\n" cusload-base-file))
(insert ";;; " cusload-base-file
" --- automatically extracted custom dependencies\n"
(let ((members (get sym 'custom-group))
item where found)
(setq item (car (car members))
members (cdr members)
where (gethash item hash))
(unless (or (null where)
(member where found))
(insert " ")
(insert "(custom-add-loads '"
(symbol-name sym) " '("))
(prin1 where (current-buffer))
(push where found)))
(insert "\n;;; custom-load.el ends here\n"))
;;; cus-dep.el ends here