+(defmacro defun-gmm (name function arg-list &rest body)
+ "Create function NAME.
+If FUNCTION exists, then NAME becomes an alias for FUNCTION.
+Otherwise, create function NAME with ARG-LIST and BODY."
+ (let ((defined-p (fboundp function)))
+ (if defined-p
+ `(defalias ',name ',function)
+ `(defun ,name ,arg-list ,@body))))
+
+(defun-gmm gmm-image-search-load-path
+ image-search-load-path (file &optional path)
+ "Emacs 21 and XEmacs don't have `image-search-load-path'.
+This function returns nil on those systems."
+ nil)
+
+;; Cf. `mh-image-load-path-for-library' in `mh-compat.el'.
+
+(defun-gmm gmm-image-load-path-for-library
+ image-load-path-for-library (library image &optional path no-error)
+ "Return a suitable search path for images used by LIBRARY.
+
+It searches for IMAGE in `image-load-path' (excluding
+\"`data-directory'/images\") and `load-path', followed by a path
+suitable for LIBRARY, which includes \"../../etc/images\" and
+\"../etc/images\" relative to the library file itself, and then
+in \"`data-directory'/images\".
+
+Then this function returns a list of directories which contains
+first the directory in which IMAGE was found, followed by the
+value of `load-path'. If PATH is given, it is used instead of
+`load-path'.
+
+If NO-ERROR is non-nil and a suitable path can't be found, don't
+signal an error. Instead, return a list of directories as before,
+except that nil appears in place of the image directory.
+
+Here is an example that uses a common idiom to provide
+compatibility with versions of Emacs that lack the variable
+`image-load-path':
+
+ ;; Shush compiler.
+ (defvar image-load-path)
+
+ (let* ((load-path (image-load-path-for-library \"mh-e\" \"mh-logo.xpm\"))
+ (image-load-path (cons (car load-path)
+ (when (boundp 'image-load-path)
+ image-load-path))))
+ (mh-tool-bar-folder-buttons-init))"
+ (unless library (error "No library specified"))
+ (unless image (error "No image specified"))
+ (let (image-directory image-directory-load-path)
+ ;; Check for images in image-load-path or load-path.
+ (let ((img image)
+ (dir (or
+ ;; Images in image-load-path.
+ (gmm-image-search-load-path image) ;; "gmm-" prefix!
+ ;; Images in load-path.
+ (locate-library image)))
+ parent)
+ ;; Since the image might be in a nested directory (for
+ ;; example, mail/attach.pbm), adjust `image-directory'
+ ;; accordingly.
+ (when dir
+ (setq dir (file-name-directory dir))
+ (while (setq parent (file-name-directory img))
+ (setq img (directory-file-name parent)
+ dir (expand-file-name "../" dir))))
+ (setq image-directory-load-path dir))
+
+ ;; If `image-directory-load-path' isn't Emacs' image directory,
+ ;; it's probably a user preference, so use it. Then use a
+ ;; relative setting if possible; otherwise, use
+ ;; `image-directory-load-path'.
+ (cond
+ ;; User-modified image-load-path?
+ ((and image-directory-load-path
+ (not (equal image-directory-load-path
+ (file-name-as-directory
+ (expand-file-name "images" data-directory)))))
+ (setq image-directory image-directory-load-path))
+ ;; Try relative setting.
+ ((let (library-name d1ei d2ei)
+ ;; First, find library in the load-path.
+ (setq library-name (locate-library library))
+ (if (not library-name)
+ (error "Cannot find library %s in load-path" library))
+ ;; And then set image-directory relative to that.
+ (setq
+ ;; Go down 2 levels.
+ d2ei (file-name-as-directory
+ (expand-file-name
+ (concat (file-name-directory library-name) "../../etc/images")))
+ ;; Go down 1 level.
+ d1ei (file-name-as-directory
+ (expand-file-name
+ (concat (file-name-directory library-name) "../etc/images"))))
+ (setq image-directory
+ ;; Set it to nil if image is not found.
+ (cond ((file-exists-p (expand-file-name image d2ei)) d2ei)
+ ((file-exists-p (expand-file-name image d1ei)) d1ei)))))
+ ;; Use Emacs' image directory.
+ (image-directory-load-path
+ (setq image-directory image-directory-load-path))
+ (no-error
+ (message "Could not find image %s for library %s" image library))
+ (t
+ (error "Could not find image %s for library %s" image library)))
+
+ ;; Return an augmented `path' or `load-path'.
+ (nconc (list image-directory)
+ (delete image-directory (copy-sequence (or path load-path))))))
+
+(defun gmm-customize-mode (&optional mode)
+ "Customize customization group for MODE.
+If mode is nil, use `major-mode' of the current buffer."
+ (interactive)
+ (customize-group
+ (or mode
+ (intern (let ((mode (symbol-name major-mode)))
+ (string-match "^\\(.+\\)-mode$" mode)
+ (match-string 1 mode))))))
+
+(defun gmm-write-region (start end filename &optional append visit
+ lockname mustbenew)
+ "Compatibility function for `write-region'.
+
+In XEmacs, the seventh argument of `write-region' specifies the
+coding-system."
+ (if (and mustbenew
+ (or (featurep 'xemacs)
+ (= emacs-major-version 20)))
+ (if (file-exists-p filename)
+ (signal 'file-already-exists
+ (list "File exists" filename))
+ (write-region start end filename append visit lockname))
+ (write-region start end filename append visit lockname mustbenew)))
+