ecb / ecb-util.el

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;;; ecb-util.el --- utility functions for ECB

;; Copyright (C) 2000 - 2003 Jesper Nordenberg,
;;                           Klaus Berndl,
;;                           Kevin A. Burton,
;;                           Free Software Foundation, Inc.

;; Author: Jesper Nordenberg <mayhem@home.se>
;;         Klaus Berndl <klaus.berndl@sdm.de>
;;         Kevin A. Burton <burton@openprivacy.org>
;; Maintainer: Klaus Berndl <klaus.berndl@sdm.de>
;;             Kevin A. Burton <burton@openprivacy.org>
;; Keywords: browser, code, programming, tools
;; Created: 2000

;; This program 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.

;; This program 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
;; GNU Emacs; see the file COPYING.  If not, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

;; $Id$

;;; Commentary:
;;
;; Contains misc utility functions for ECB.
;;
;; This file is part of the ECB package which can be found at:
;; http://ecb.sourceforge.net

;;; History
;;
;; For the ChangeLog of this file see the CVS-repository. For a complete
;; history of the ECB-package see the file NEWS.

;;; Code:

(eval-when-compile
  (require 'silentcomp))

(eval-when-compile (require 'cl))

;; XEmacs
(silentcomp-defun frame-property)
(silentcomp-defun point-at-bol)
(silentcomp-defun point-at-eol)
(silentcomp-defun frame-parameter)
(silentcomp-defun line-beginning-position)
(silentcomp-defun line-end-position)
(silentcomp-defun window-pixel-edges)
(silentcomp-defun noninteractive)
;; Emacs
(silentcomp-defvar noninteractive)
(silentcomp-defun window-edges)
(silentcomp-defun buffer-local-value)
(silentcomp-defun posn-point)
(silentcomp-defun posn-window)
(silentcomp-defun event-start)
;; XEmacs
(silentcomp-defun mswindows-cygwin-to-win32-path)
(silentcomp-defun make-dialog-box)
(silentcomp-defun display-message)
(silentcomp-defun clear-message)
(silentcomp-defun make-event)
;; Emacs
(silentcomp-defvar message-log-max)
(silentcomp-defvar message-truncate-lines)
(silentcomp-defun x-popup-dialog)
(silentcomp-defun display-images-p)
(silentcomp-defvar tar-subfile-mode)
(silentcomp-defvar archive-subfile-mode)

;; timer stuff for Xemacs
(silentcomp-defun delete-itimer)
(silentcomp-defun start-itimer)
;; thing stuff for XEmacs
(silentcomp-defun thing-boundaries)
(silentcomp-defun thing-symbol)

(silentcomp-defun custom-file)

;; Some constants
(defconst ecb-running-xemacs (string-match "XEmacs\\|Lucid" emacs-version))
(defconst ecb-running-emacs-21 (and (not ecb-running-xemacs)
                                    (> emacs-major-version 20)))

;; TODO: Klaus Berndl <klaus.berndl@sdm.de>: Test this with native
;; Windows-XEmacs if it works with this change correct and also if it works
;; without this change incorrect!
(defconst ecb-directory-sep-char
  (if ecb-running-xemacs directory-sep-char ?/))
(defconst ecb-directory-sep-string (char-to-string ecb-directory-sep-char))

(defconst ecb-temp-dir
  (file-name-as-directory
   (or (getenv "TMPDIR") (getenv "TMP") (getenv "TEMP")
       (cond ((eq system-type 'windows-nt) "c:/temp/")
             (t "/tmp/"))))
  "A directory where ECB can store temporary files.")

(defconst ecb-ecb-dir
  (expand-file-name (file-name-directory (locate-library "ecb"))))
(defconst ecb-semantic-dir
  (if (locate-library "semantic")
      (expand-file-name (file-name-directory (locate-library "semantic")))))

(defconst ecb-ecb-parent-dir (expand-file-name (concat ecb-ecb-dir "../")))

;; we assume that current loaded ECB is a regular XEmacs-package if and only
;; if `ecb-ecb-dir' contains the files "_pkg.el" and "auto-autoloads.el" and
;; we are running XEmacs
(defconst ecb-regular-xemacs-package-p
  (and ecb-running-xemacs
       (file-exists-p (expand-file-name (concat ecb-ecb-dir "_pkg.el")))
       (file-exists-p (expand-file-name (concat ecb-ecb-dir "auto-autoloads.el")))))
(defconst ecb-semantic-regular-xemacs-package-p
  (and ecb-running-xemacs
       ecb-semantic-dir
       (file-exists-p (expand-file-name (concat ecb-semantic-dir "_pkg.el")))
       (file-exists-p (expand-file-name (concat ecb-semantic-dir "auto-autoloads.el")))))

(defconst ecb-images-can-be-used
  (and (or (fboundp 'defimage)
           (fboundp 'make-image-specifier))
       (if (fboundp 'display-images-p)
           (display-images-p)
         window-system)))

;; ---------- compatibility between GNU Emacs and XEmacs ---------------------

;; miscellaneous differences

(if ecb-running-xemacs
    (progn
;;; Compatibility
      (defun ecb-noninteractive ()
        "Return non-nil if running non-interactively, i.e. in batch mode."
        (noninteractive))
      (defun ecb-subst-char-in-string (fromchar tochar string &optional inplace)
        "Replace FROMCHAR with TOCHAR in STRING each time it occurs.
Unless optional argument INPLACE is non-nil, return a new string."
        (let ((i (length string))
              (newstr (if inplace string (copy-sequence string))))
          (while (> i 0)
            (setq i (1- i))
            (if (eq (aref newstr i) fromchar)
                (aset newstr i tochar)))
          newstr))
      (defalias 'ecb-frame-parameter 'frame-property)
      (defalias 'ecb-line-beginning-pos 'point-at-bol)
      (defalias 'ecb-line-end-pos 'point-at-eol)
      (defalias 'ecb-event-window 'event-window)
      (defalias 'ecb-event-point 'event-point)
      (defalias 'ecb-event-buffer 'event-buffer)
      (defalias 'ecb-window-full-width 'window-full-width)
      (defalias 'ecb-window-full-height 'window-height)
      (defun ecb-frame-char-width (&optional frame)
        (/ (frame-pixel-width frame) (frame-width frame)))
      (defun ecb-frame-char-height (&optional frame)
        (/ (frame-pixel-height frame) (frame-height frame)))
      (defun ecb-window-edges (&optional window)
        (let ((pix-edges (window-pixel-edges window)))
          (list (/ (nth 0 pix-edges) (ecb-frame-char-width))
                (/ (nth 1 pix-edges) (ecb-frame-char-height))
                (/ (nth 2 pix-edges) (ecb-frame-char-width))
                (/ (nth 3 pix-edges) (ecb-frame-char-height))))))
      
  (defun ecb-noninteractive ()
    "Return non-nil if running non-interactively, i.e. in batch mode."
    noninteractive)
  (defalias 'ecb-subst-char-in-string 'subst-char-in-string)
  (defalias 'ecb-thing-at-point 'thing-at-point)
  (defalias 'ecb-frame-parameter 'frame-parameter)
  (defalias 'ecb-line-beginning-pos 'line-beginning-position)
  (defalias 'ecb-line-end-pos 'line-end-position)
  (defun ecb-event-window (event)
    (posn-window (event-start event)))
  (defun ecb-event-point (event)
    (posn-point (event-start event)))
  (defun ecb-event-buffer (event)
    (window-buffer (ecb-event-window event)))
  (defun ecb-window-full-width (&optional window)
    (let ((edges (window-edges window)))
      (- (nth 2 edges) (nth 0 edges))))
  (defalias 'ecb-window-full-height 'window-height)
  (defalias 'ecb-frame-char-width 'frame-char-width)
  (defalias 'ecb-frame-char-height 'frame-char-height)
  (defalias 'ecb-window-edges 'window-edges))

;; thing at point stuff

(if (not ecb-running-xemacs)
    (progn
      (require 'thingatpt)
      (defalias 'ecb-thing-at-point 'thing-at-point)
      (defalias 'ecb-end-of-thing 'end-of-thing)
      (defalias 'ecb-beginning-of-thing 'beginning-of-thing))
  ;; Xemacs
  (require 'thing)
  (defun ecb-thing-at-point (thing)
    (let ((bounds (if (eq 'symbol thing)
                      (thing-symbol (point))
                    (thing-boundaries (point)))))
      (buffer-substring (car bounds) (cdr bounds))))
  (defun ecb-end-of-thing (thing)
    (goto-char (cdr (if (eq 'symbol thing)
                        (thing-symbol (point))
                      (thing-boundaries (point))))))
  (defun ecb-beginning-of-thing (thing)
    (goto-char (car (if (eq 'symbol thing)
                        (thing-symbol (point))
                      (thing-boundaries (point)))))))

;; overlay- and extend-stuff

(if (not ecb-running-xemacs)
    (progn
      (defalias 'ecb-make-overlay            'make-overlay)
      (defalias 'ecb-overlay-put             'overlay-put)
      (defalias 'ecb-overlay-move            'move-overlay)
      (defalias 'ecb-overlay-delete          'delete-overlay)
      (defalias 'ecb-overlay-kill            'delete-overlay))
  ;; XEmacs
  (defalias 'ecb-make-overlay            'make-extent)
  (defalias 'ecb-overlay-put             'set-extent-property)
  (defalias 'ecb-overlay-move            'set-extent-endpoints)
  (defalias 'ecb-overlay-delete          'detach-extent)
  (defalias 'ecb-overlay-kill            'delete-extent))

;; timer stuff

(if (not ecb-running-xemacs)
    (progn
      (defalias 'ecb-run-with-timer 'run-with-timer)
      (defalias 'ecb-run-with-idle-timer 'run-with-idle-timer)
      (defalias 'ecb-cancel-timer 'cancel-timer))
  ;; XEmacs
  (defun ecb-run-with-timer (secs repeat function &rest args)
    (start-itimer "ecb-timer" function secs repeat
                  nil (if args t nil) args))
  (defun ecb-run-with-idle-timer (secs repeat function &rest args)
    (start-itimer "ecb-idle-timer"
                  function secs (if repeat secs nil)
                  t (if args t nil) args))
  (defun ecb-cancel-timer (timer)
    (delete-itimer timer))
  )

;; ---------- End of compatibility between GNU Emacs and XEmacs -------------
  
;; Emacs 20 has no window-list function and the XEmacs and Emacs 21 one has no
;; specified ordering. The following one is stolen from XEmacs and has fixed
;; this lack of a well defined order. We preserve also point of current
;; buffer! IMPORTANT: When the window-ordering is important then currently
;; these function should only be used with WINDOW = (frame-first-window
;; ecb-frame)!
(defun ecb-window-list (&optional frame minibuf window)
  "Return a list of windows on FRAME, beginning with WINDOW. The
windows-objects in the result-list are in the same canonical windows-ordering
of `next-window'. If omitted, WINDOW defaults to the selected window. FRAME and
WINDOW default to the selected ones. Optional second arg MINIBUF t means count
the minibuffer window even if not active. If MINIBUF is neither t nor nil it
means not to count the minibuffer even if it is active."
  (if ecb-running-emacs-21
      ;; TODO: Klaus Berndl <klaus.berndl@sdm.de>: There seems to be
      ;; mysterious behavior when running our own window-list version with
      ;; GNU Emacs >= 21.3 - especially when running an igrep when the
      ;; igrep-buffer is already in another window. We can here savely use the
      ;; function `window-list' because it returns an ordered list
      (window-list frame minibuf window)
    (setq window (or window (selected-window))
          frame (or frame (selected-frame)))
    (if (not (eq (window-frame window) frame))
        (error "Window must be on frame."))
    (let ((current-frame (selected-frame))
          (current-point (point))
          list)
      (unwind-protect
          (save-window-excursion
            (select-frame frame)
            ;; this is needed for correct start-point
            (select-window window)
            (walk-windows
             (function (lambda (cur-window)
                         (if (not (eq window cur-window))
                             (setq list (cons cur-window list)))))
             minibuf
             'selected)
            ;; This is needed to get the right canonical windows-order, i.e. the
            ;; same order of windows than `walk-windows' walks through!
            (setq list (nreverse list))
            (setq list (cons window list)))
        (select-frame current-frame)
        ;; we must reset the point of the buffer which was current at call-time
        ;; of this function
        (goto-char current-point)))))


;; TODO: Klaus Berndl <klaus.berndl@sdm.de>: Attention. Current mechanism of
;; (de)activating the basic advices and the intelligent window advices of
;; `ecb-advice-window-functions' independent from each other works only if
;; both sets of functions are disjunct (because ad-activate always activates
;; ALL advices of a function if they are not disabled!)
(defconst ecb-basic-adviced-functions (if ecb-running-xemacs
                                          '((delete-frame . around)
                                            (compilation-set-window-height . around)
                                            (shrink-window-if-larger-than-buffer . around)
                                            (show-temp-buffer-in-current-frame . around)
                                            (pop-to-buffer . around)
                                            (current-window-configuration . after)
                                            (set-window-configuration . after)
                                            (scroll-other-window . around)
                                            (custom-save-all . around)
                                            (count-windows . around)
                                            (scroll-all-mode . after))
                                        '((delete-frame . around)
                                          (compilation-set-window-height . around)
                                          (resize-temp-buffer-window . around)
                                          (shrink-window-if-larger-than-buffer . around)
                                          (mouse-drag-vertical-line . around)
                                          (mouse-drag-mode-line . around)
                                          (pop-to-buffer . around)
                                          (current-window-configuration . after)
                                          (set-window-configuration . after)
                                          (enlarge-window . around)
                                          (shrink-window . around)
                                          (tmm-prompt . around)
                                          (scroll-other-window . around)
                                          (custom-save-all . around)
                                          (count-windows . around)
                                          (scroll-all-mode . after)))
  "These functions are always adviced if ECB is active. Each element of the
list is a cons-cell where the car is the function-symbol and the cdr the
advice-class \(before, around or after). If a function should be adviced with
more than one class \(e.g. with a before and an after-advice) then for every
class a cons must be added to this list.

Every basic advice of ECB must be registered in this constant but can be
implemented in another file!")

(defun ecb-enable-advices (advice-list)
  "Enable all advices of ADVICE-LIST. ADVICE-LIST must have the format of
`ecb-basic-adviced-functions'."
  (dolist (elem advice-list)
    (ad-enable-advice (car elem) (cdr elem) 'ecb)
    (ad-activate (car elem))))
  
(defun ecb-disable-advices (advice-list)
  "Disable all advices of ADVICE-LIST. ADVICE-LIST must have the format of
`ecb-basic-adviced-functions'."
  (dolist (elem advice-list)
    (ad-disable-advice (car elem) (cdr elem) 'ecb)
    (ad-activate (car elem))))
  

(defmacro ecb-with-original-basic-functions (&rest body)
  "Evaluates BODY with all adviced basic-functions of ECB deactivated \(means
with their original definition). Restores always the previous state of the ECB
adviced basic-functions, means after evaluating BODY it activates the advices
of exactly the functions in `ecb-basic-adviced-functions'!"
  `(unwind-protect
       (progn
         (ecb-disable-advices ecb-basic-adviced-functions)
         ,@body)
     (ecb-enable-advices ecb-basic-adviced-functions)))

(defun ecb-enable-ecb-advice (function-symbol advice-type arg)
  "If ARG is greater or equal zero then enable the adviced version of
FUNCTION-SYMBOL. The advice must be of type of the ADVICE-TYPE which can be
'around, 'before or 'after."
  (if (< arg 0)
      (progn
        (ad-disable-advice function-symbol advice-type 'ecb)
        (ad-activate function-symbol))
    (ad-enable-advice function-symbol advice-type  'ecb)
    (ad-activate function-symbol)))

(defmacro ecb-with-ecb-advice (function-symbol advice-type &rest body)
  "Evaluates BODY with the adviced version of FUNCTION-SYMBOL. The advice must
be of type of the ADVICE-TYPE which can be 'around, 'before or 'after. Such an
advice has to ensure that it behaves as its original version when called for
another frame than the `ecb-frame'."
  `(unwind-protect
       (progn
         (ecb-enable-ecb-advice ,function-symbol ,advice-type 1)
         ,@body)
     (ecb-enable-ecb-advice ,function-symbol ,advice-type -1)))

(put 'ecb-with-ecb-advice 'lisp-indent-function 2)


;; some basic advices

(defun ecb-custom-file ()
  "Filename of that file which is used by \(X)Emacs to store the
customize-options."
  (cond (ecb-running-xemacs
         custom-file)
        (ecb-running-emacs-21
         (custom-file))
        (t
         (or custom-file
             user-init-file))))

(defadvice custom-save-all (around ecb)
  "Save the customized options completely in the background, i.e. the
file-buffer where the value is saved \(see option `custom-file') is not parsed
by semantic and also killed afterwards."
  (if ecb-minor-mode
      (let ((ecb-window-sync nil)
            (kill-buffer-hook nil)
            ;; we prevent parsing the custom-file
            (semantic-before-toplevel-bovination-hook (lambda ()
                                                        nil))
            (semantic--before-fetch-tags-hook (lambda ()
                                                nil))
            (semantic-after-toplevel-cache-change-hook nil)
            (semantic-after-partial-cache-change-hook nil))
        ;; now we do the standard task
        ad-do-it
        ;; now we have to kill the custom-file buffer otherwise semantic would
        ;; parse the buffer of custom-file and the method-buffer would be
        ;; updated with the contents of custom-file which is definitely not
        ;; desired.
        (ignore-errors
          (kill-buffer (find-file-noselect (ecb-custom-file)))))
    ad-do-it))

;; assoc helpers

(defun ecb-remove-assoc (key list)
  (delete nil
          (mapcar (function (lambda (elem)
                              (if (equal (car elem) key)
                                  nil
                                elem)))
                  list)))


(defun ecb-add-assoc (key-value list)
  (cons key-value list))

(defun ecb-find-assoc-value (key list)
  (cdr (assoc key list)))

(defun ecb-find-assoc (key list)
  (assoc key list))


;; some function from cl - but we do not want to call cl-functions at runtime

(defun ecb-filter (seq pred)
  "Filter out those elements of SEQUENCE for which PREDICATE returns nil."
  (let ((res))
    (dolist (elem seq)
      (if (if pred (funcall pred elem) elem)
          (setq res (append res (list elem)))))
    res))

(defun ecb-some (cl-pred cl-seq &rest cl-rest)
  "Return true if PREDICATE is true of any element of SEQ or SEQs.
If so, return the true (non-nil) value returned by PREDICATE."
  (if (or cl-rest (nlistp cl-seq))
      (catch 'cl-some
	(apply 'map nil
	       (function (lambda (&rest cl-x)
			   (let ((cl-res (apply cl-pred cl-x)))
			     (if cl-res (throw 'cl-some cl-res)))))
	       cl-seq cl-rest) nil)
    (let ((cl-x nil))
      (while (and cl-seq (not (setq cl-x (funcall cl-pred (pop cl-seq))))))
      cl-x)))

(defun ecb-copy-list (list)
  "Return a copy of a list, which may be a dotted list.
The elements of the list are not copied, just the list structure itself."
  (if (consp list)
      (let ((res nil))
	(while (consp list) (push (pop list) res))
	(prog1 (nreverse res) (setcdr res list)))
    (car list)))

(defun ecb-set-difference (list1 list2)
  "Combine LIST1 and LIST2 using a set-difference operation.
The result list contains all items that appear in LIST1 but not LIST2.
This is a non-destructive function; it makes a copy of the data if necessary
to avoid corrupting the original LIST1 and LIST2."
  (if (or (null list1) (null list2)) list1
    (let ((res nil))
      (while list1
        (or (if (numberp (car list1))
                (apply 'ecb-member (car list1) list2)
              (memq (car list1) list2))
            (push (car list1) res))
        (pop list1))
      res)))

(defun ecb-member (item list)
  "Find the first occurrence of ITEM in LIST.
Return the sublist of LIST whose car is ITEM."
  (if (and (numberp item) (not (integerp item)))
      (member item list)
    (memq item list)))

(defun ecb-set-elt (seq n val)
  "Set VAL as new N-th element of SEQ. SEQ can be any sequence. SEQ will be
changed because this is desctructive function. SEQ is returned."
  (if (listp seq)
      (setcar (nthcdr n seq) val)
    (aset seq n val))
  seq)

(defun ecb-replace-first-occurence (seq old-elem new-elem)
  "Replace in SEQ the first occurence of OLD-ELEM with NEW-ELEM. Comparison is
done by `equal'. This is desctructive function. SEQ is returned."
  (let ((pos (ecb-position seq old-elem)))
    (if pos
        (ecb-set-elt seq pos new-elem)))
  seq)

(defun ecb-replace-all-occurences (seq old-elem new-elem)
  "Replace in SEQ all occurences of OLD-ELEM with NEW-ELEM. Comparison is
done by `equal'. This is desctructive function. SEQ is returned."
  (while (ecb-position seq old-elem)
    (setq seq (ecb-replace-first-occurence seq old-elem new-elem)))
  seq)

(defun ecb-remove-first-occurence-from-list (list elem)
  "Replace first occurence of ELEM from LIST. Comparison is done by `equal'.
This is desctructive function. LIST is returned."
  (delq nil (ecb-replace-first-occurence list elem nil)))

(defun ecb-remove-all-occurences-from-list (list elem)
  "Replace all occurences of ELEM from LIST. Comparison is done by `equal'.
This is desctructive function. LIST is returned."
  (delq nil
        (progn          
          (while (ecb-position list elem)
            (setq list (ecb-replace-first-occurence list elem nil)))
          list)))

;; canonical filenames

(defun ecb-fix-path (path)
  "Fixes an annoying behavior of the native windows-version of XEmacs:
When PATH contains only a drive-letter and a : then `expand-file-name' does
not interpret this PATH as root of that drive. So we add a trailing
`directory-sep-char' and return this new path because then `expand-file-name'
treats this as root-dir of that drive. For all \(X)Emacs-version besides the
native-windows-XEmacs PATH is returned."
  (if (and ecb-running-xemacs
           (equal system-type 'windows-nt))
      (if (and (= (length path) 2)
               (equal (aref path 1) ?:))
          (concat path ecb-directory-sep-string)
        path)
    path))

;; TODO: Klaus Berndl <klaus.berndl@sdm.de>: What about the new cygwin-version
;; of GNU Emacs 21? We have to test if this function and all locations where
;; `ecb-fix-path' is used work correctly with the cygwin-port of GNU Emacs.
(defun ecb-fix-filename (path &optional filename substitute-env-vars)
  "Normalizes path- and filenames for ECB. If FILENAME is not nil its pure
filename \(i.e. without directory part) will be concatenated to PATH. The
result will never end with the directory-separator! If SUBSTITUTE-ENV-VARS is
not nil then in both PATH and FILENAME env-var substitution is done. If the
`system-type' is 'cygwin32 then the path is converted to win32-path-style!"
  (when (stringp path)
    (let (norm-path)
      (setq norm-path (if ecb-running-xemacs
                          (cond ((equal system-type 'cygwin32)
                                 (mswindows-cygwin-to-win32-path
                                  (expand-file-name path)))
                                ((equal system-type 'windows-nt)
                                 (expand-file-name (ecb-fix-path path)))
                                (t (expand-file-name path)))
                        (expand-file-name path)))
      ;; For windows systems we normalize drive-letters to downcase
      (setq norm-path (if (and (member system-type '(windows-nt cygwin32))
                               (> (length norm-path) 1)
                               (equal (aref norm-path 1) ?:))
                          (concat (downcase (substring norm-path 0 2))
                                  (substring norm-path 2))
                        norm-path))
      ;; substitute environment-variables
      (setq norm-path (expand-file-name (if substitute-env-vars
                                            (substitute-in-file-name norm-path)
                                          norm-path)))
      ;; delete a trailing directory-separator if there is any
      (setq norm-path (if (and (> (length norm-path) 1)
                               (= (aref norm-path
                                        (1- (length norm-path))) ecb-directory-sep-char))
                          (substring norm-path 0 (1- (length norm-path)))
                        norm-path))
      (concat norm-path
              (if (stringp filename)
                  (concat (if (> (length norm-path) 1)
                              ecb-directory-sep-string)
                          (file-name-nondirectory (if substitute-env-vars
                                                      (substitute-in-file-name filename)
                                                    filename))))))))


(defun ecb-nolog-message (&rest args)
  "Works exactly like `message' but does not log the message"
  (let ((msg (cond ((or (null args)
                        (null (car args)))
                    nil)
                   ((null (cdr args))
                    (car args))
                   (t
                    (apply 'format args)))))
    ;; Now message is either nil or the formated string.
    (if ecb-running-xemacs
        ;; XEmacs way of preventing log messages.
        (if msg
            (display-message 'no-log msg)
          (clear-message 'no-log))
      ;; Emacs way of preventing log messages.
      (let ((message-log-max nil)
            (message-truncate-lines nil))
        (if msg
            (message "%s" msg)
          (message nil))))
    msg))

(defun ecb-confirm (text)
  (yes-or-no-p text))

(defun ecb-delete-file (file)
  (let ((exp-file (expand-file-name file)))
    (if (file-exists-p exp-file)
        (delete-file exp-file))))

(defun ecb-enlarge-window(window &optional val)
  "Enlarge the given window.
If VAL is nil then WINDOW is enlarged so that it is 1/2 of the current frame.
If VAL is a positive integer then WINDOW is enlarged so that its new height is
VAL lines. If VAL is > 0 and < 1 then WINDOW is enlarged so that its new
height is that fraction of the frame."
  (if (and window (window-live-p window))
      (let* ((norm-val (if val
                           (ecb-normalize-number val (1- (frame-height)))
                         (/ (1- (frame-height)) 2)))
             (enlargement (- norm-val (ecb-window-full-height window))))
        (save-selected-window
          (select-window window)          
          (if (> enlargement 0)
              (enlarge-window enlargement))))
    (error "Window is not alive!")))

;; stolen from query.el and slightly enhanced
;; This for a small number of choices each of them a short string
(defun ecb-query-string (prompt choices &optional other-prompt)
  "Prints PROMPT and returns a string which must be one of CHOICES.
CHOICES is either a list of strings whereas the first choice is the default
\(which is returned if the user simply types RET) or nil \(then only a simple
RET quits the query and returns nil). If OTHER-PROMPT is not nil and a string
then the choice \"other\" is added to CHOICES and after selecting this choice
the user is prompted with OTHER-PROMPT to insert any arbitrary string."
  (let* ((new-choices (if other-prompt
                          ;; Emacs 20.X add-to-list can not append at the end
                          (append choices (list "other"))
                        choices))
         (default (car new-choices))
         answer)
    (setq prompt (concat prompt
                         " ["
                         (if new-choices
                             (mapconcat (function (lambda (x) x))
                                        new-choices ", ")
                           "RET")
                         "] "))
    (setq new-choices (nconc (mapcar (function (lambda (x) (list x t)))
                                     new-choices)
                             '('("" t))))
    (setq answer (completing-read prompt new-choices nil t))
    (cond ((string= answer "")
           (setq answer default))
          ((string= answer "other")
           (setq answer (read-string (concat other-prompt ": ")))))
    answer))

;; This is for any number of string-choices without any length restriction -
;; see also `ecb-query-string'.
(defun ecb-offer-choices (prompt choices)
  "Prints PROMPT and returns a string which must be one of CHOICES.
CHOICES is a list of strings whereas the first choice is the default. All
choices are immediately displayed as if completion does it so a selection can
be made either with the mouse or with the keyboard."
  (let* ((minibuffer-setup-hook
          (append minibuffer-setup-hook
                  (list (lambda ()
                          (with-output-to-temp-buffer "*Completions*"
                            (display-completion-list (all-completions "" minibuffer-completion-table)))))))
         (completion-list (mapcar (function (lambda (x) (list x t)))
                                  choices))
         (answer (completing-read prompt
                                  completion-list
                                  nil t
                                  (try-completion "" completion-list))))
    (if (string= answer "")
        (car choices)
      answer)))


;; ecb-offer-choices-1 and ecb-offer-choices-2 are two other approaches for
;; ecb-offer-choices - but IMHO not as good and clean as the current one and
;; therefore not used in ECB
(defun ecb-offer-choices-1 (prompt choices)
  "Prints PROMPT and returns a string which must be one of CHOICES.
CHOICES is a list of strings whereas the first choice is the default. All
choices are immediately displayed as if completion does it so a selection can
be made either with the mouse or with the keyboard."
  (let* ((minibuffer-setup-hook
          (append minibuffer-setup-hook
                  '(minibuffer-complete
                    minibuffer-complete
                    minibuffer-complete)))
         (answer (completing-read
                  prompt
                  (mapcar (function (lambda (x) (list x t)))
                          choices)
                  nil t)))
    (if (string= answer "")
        (car choices)
      answer)))

(defun ecb-offer-choices-2 (prompt choices)
  "Prints PROMPT and returns a string which must be one of CHOICES.
CHOICES is a list of strings whereas the first choice is the default. All
choices are immediately displayed as if completion does it so a selection can
be made either with the mouse or with the keyboard."
  ;; First we create a TAB-event
  (let ((event (if ecb-running-xemacs
                   (make-event 'key-press '(key tab))
                 9)))
    ;; With these 3 TAB-events we ensure that
    ;; 1. The longest possible common substring is display in the minibuffer
    ;; 2. All possible completions are displayed
    (dotimes (i 3)
      (setq unread-command-events (cons event unread-command-events))))
  (let ((answer (completing-read
                 prompt
                 (mapcar (function (lambda (x) (list x t)))
                         choices)
                 nil t)))
    (if (string= answer "")
        (car choices)
      answer)))

(defun ecb-normalize-number (value &optional ref-value)
  "Normalize VALUE in the following manner and return:
* VALUE > -1.0 and < +1.0 and REF-VALUE a number: `floor' of VALUE * REF-VALUE
* all other cases: `floor' of VALUE"
  (floor (if (and (< value 1.0)
                  (> value -1.0)
                  (numberp ref-value))
             (* ref-value value)
           value)))

(defmacro ecb-with-readonly-buffer (buffer &rest body)
  "Make buffer BUFFER current but do not display it. Evaluate BODY in buffer
BUFFER \(not read-only an evaluation-time of BODY) and make afterwards BUFFER
read-only. Note: All this is done with `save-excursion' so after BODY that
buffer is current which was it before calling this macro."
  `(if (buffer-live-p ,buffer)
       (save-excursion
         (set-buffer ,buffer)
         (unwind-protect
             (progn
               (setq buffer-read-only nil)
               ,@body)
           (setq buffer-read-only t)))
     (ecb-error "Try to set a not existing buffer.")))

(put 'ecb-with-readonly-buffer 'lisp-indent-function 1)

(defmacro ecb-do-if-buffer-visible-in-ecb-frame (buffer-name-symbol &rest body)
  "Evaluate BODY if the following conditions are all true:
- The symbol BUFFER-NAME-SYMBOL is bound
- The value of BUFFER-NAME-SYMBOL is a name of a living buffer B
- The buffer B is visible and displayed in a window of the `ecb-frame'
- ECB is active
- The current frame is the `ecb-frame'
- The window of buffer B is not a window in the edit-area.
If one of these conditions is false then nothing will be done.

During the evaluation of BODY the following local variables are bound:
- visible-buffer: The buffer-object which name is the value of
  BUFFER-NAME-SYMBOL.
- visible-window: The window which displays visible-buffer"
  `(let* ((visible-buffer (if (and (boundp ,buffer-name-symbol)
                                   (stringp (symbol-value ,buffer-name-symbol)))
                              (get-buffer (symbol-value ,buffer-name-symbol))))
          (visible-window (if (bufferp visible-buffer)
                              (get-buffer-window visible-buffer))))
     (when (and ecb-minor-mode
                (equal (selected-frame) ecb-frame)
                visible-window
                (window-live-p visible-window)
                (not (member visible-window (ecb-canonical-edit-windows-list))))
       ,@body)))

(put 'ecb-do-if-buffer-visible-in-ecb-frame 'lisp-indent-function 1)

(defun ecb-read-number (prompt &optional init-value)
  "Ask in the minibuffer for a number with prompt-string PROMPT. Optional
INIT-VALUE can be either a number or a string-representation of a number."
  (let ((init (cond ((numberp init-value)
                     (number-to-string init-value))
                    ((stringp init-value)
                     (if (string= init-value "0")
                         init-value
                       (if (not (= 0 (string-to-number init-value)))
                           init-value
                         (ecb-error "ecb-read-number: init-value not a valid number!"))))
                    (t nil)))
        result)
    (while (progn
             (setq result (read-string prompt init))
             (not (or (string= "0" result)
                      (not (= 0 (string-to-number result)))))))
    (string-to-number result)))

(defun ecb-option-get-value (option &optional type)
  "Return the value of a customizable ECB-option OPTION with TYPE, where TYPE
can either be 'standard-value \(the default-value of the defcustom) or
'saved-value \(the value stored durable by the user via customize) or
'customized-value \(the value set but not saved in the customize buffer).
If TYPE is nil then the most recent set value is returned, means it
tries the customized-value, then the saved-value and then the standard-value
in exactly this sequence."
  (let ((val (car (if type
                      (get option type)
                    (or (get option 'customized-value)
                        (get option 'saved-value)
                        (get option 'standard-value))))))
    (cond ((not (listp val)) val)
          ((equal 'quote (car val)) (car (cdr val)))
          (t (car val)))))

(defun ecb-message-box (message-str &optional title-text button-text)
  "Display a message-box with message MESSAGE-STR and title TITLE-TEXT if
TITLE-TEXT is not nil - otherwise \"Message-box\" is used as title. The title
gets always the prefix \"ECB - \". Second optional argument BUTTON-TEXT
specifies the text of the message-box button; if nil then \"OK\" is used.

Remark: BUTTON-TEXT is currently only used with XEmacs. With GNU Emacs the
message itself is the button because GNU Emacs currently does not support
dialog-boxes very well.

If `window-system' is nil then a simple message is displayed in the echo-area."
  (let ((button (if (stringp button-text)
                    button-text
                  "OK"))
        (title (concat "ECB"
                       (if (stringp title-text)
                           (concat " - " title-text)
                         " Message"))))
    (if window-system
        (progn
          (if ecb-running-xemacs
              (make-dialog-box 'question
                               :title title
                               :modal t
                               :question message-str
                               :buttons (list (vector button '(identity nil) t)))
            (x-popup-dialog t (list title (cons message-str t))))
          t)
      (message (concat title " " message-str)))))

(defun ecb-merge-face-into-text (text face)
  "Merge FACE to the already precolored TEXT so the values of all
face-attributes of FACE take effect and but the values of all face-attributes
of TEXT which are not set by FACE are preserved.
For XEmacs this merge does currently not work therefore here FACE replaces all
faces of TEXT!"
  (if (null face)
      text
    (let ((newtext (concat text)))
      (if ecb-running-xemacs
          (add-text-properties 0 (length newtext) (list 'face face) newtext)
        (alter-text-property 0 (length newtext) 'face
                             (lambda (current-face)
                               (let ((cf
                                      (cond ((facep current-face)
                                             (list current-face))
                                            ((listp current-face)
                                             current-face)
                                            (t nil)))
                                     (nf
                                      (cond ((facep face)
                                             (list face))
                                            ((listp face)
                                             face)
                                            (t nil))))
                                 ;; we must add the new-face in front of
                                 ;; current-face to get the right merge!
                                 (append nf cf)))
                             newtext))
      newtext)))


(defun ecb-error (&rest args)
  "Signals an error but prevents it from entering the debugger. This is
useful if an error-message should be signaled to the user and evaluating
should stopped but no debugging is senseful."
  (let ((debug-on-error nil))
    (error (concat "ECB " ecb-version " - Error: "
                   (apply 'format args)))))

(defun ecb-warning (&rest args)
  "Displays a warning."
  (message (concat "ECB " ecb-version " - Warning: " (apply 'format args))))

(defun ecb-info-message (&rest args)
  "Displays an information."
  (message (concat "ECB " ecb-version " - Info: " (apply 'format args))))

;; trimming

(defun ecb-excessive-trim (str)
  "Return a string where all double-and-more whitespaces in STR are replaced
with a single space-character."
  (let ((s str))
    (while (string-match "[ \t][ \t]+" s)
      (setq s (concat (substring s 0 (match-beginning 0))
                      " "
                      (substring s (match-end 0)))))
    s))

;; Klaus Berndl <klaus.berndl@sdm.de>: we have to take account that GNU Emacs
;; > 21.3 has changed its split-string function! For the new split-string is
;; >      (cdr (split-string ...)) not nil (at least in our context below),
;; >      for GNU Emacs <= 21.3 nil!
(defun ecb-left-trim (str)
  "Return a string stripped of all leading whitespaces of STR."
  (let ((split-result (split-string str "^[\n\t ]*")))
    (or (or (and (cdr split-result) ;; GNU Emacs > 21.3
                 (car (cdr split-result)))
            (car split-result))
        "")))

(defun ecb-right-trim (str)
  "Return a string stripped of all trailing whitespaces of STR."
  (or (car (split-string str "[\n\t ]*$")) ""))

(defun ecb-trim (str)
  "Applies `ecb-right-trim' and `ecb-left-trim' to STR."
  (ecb-left-trim (ecb-right-trim str)))

(defun ecb-full-trim (str)
  "Applies `ecb-trim' and `ecb-middle-trim' to STR."
  (ecb-excessive-trim (ecb-trim str)))



;; code for a working display - complete stolen from the semantic-package.
;; ECB has thrown away all code which is not needed by ECB
;; The original code is written by Eric M. Ludlam <zappo@gnu.org>

;; we need this here so we are independent of the semantic-package so we can
;; download eieio and semantic even if the user has not installed any version
;; of semantic.

;;; Variables used in stages
;;
(defvar ecb-working-message nil
  "Message stored when in a status loop.")
(defvar ecb-working-donestring nil
  "Done string stored when in a status loop.")
(defvar ecb-working-ref1 nil
  "A reference number used in a status loop.")
(defvar ecb-working-last-percent 0
  "A reference number used in a status loop.")

(defun ecb-working-frame-animation-display (length number frames)
  "Manage a simple frame-based animation for working functions.
LENGTH is the number of characters left.  NUMBER is a passed in
number (which happens to be ignored.).  While coders pass t into
NUMBER, functions using this should convert NUMBER into a vector
describing how to render the done message.
Argument FRAMES are the frames used in the animation."
  (cond ((vectorp number)
	 (let ((zone (- (length (aref frames 0)) (length (aref number 0))
			(length (aref number 1)))))
	   (if (< (length ecb-working-donestring) zone)
	       (concat " " (aref number 0)
		       (make-string
			(ceiling (/ (- (float zone)
				       (length ecb-working-donestring)) 2)) ? )
		       ecb-working-donestring
		       (make-string
			(floor (/ (- (float zone)
				     (length ecb-working-donestring)) 2)) ? )
		       (aref number 1))
	     (concat " " (aref frames (% ecb-working-ref1 (length frames)))
		     " " ecb-working-donestring))))
	(t (concat " " (aref frames (% ecb-working-ref1 (length frames)))))))

(defvar ecb-working-celeron-strings
  [ "[O     ]" "[oO    ]" "[-oO   ]" "[ -oO  ]" "[  -oO ]" "[   -oO]"
    "[    -O]" "[     O]" "[    Oo]" "[   Oo-]"  "[  Oo- ]" "[ Oo-  ]"
    "[Oo-   ]" "[O-    ]"]
  "Strings representing a silly celeron.")

(defun ecb-working-celeron-display (length number)
  "Return a string displaying a celeron as things happen.
LENGTH is the amount of display that has been used.  NUMBER
is t to display the done string, or the number to display."
  (cond ((eq number t)
	 (ecb-working-frame-animation-display length [ "[" "]" ]
					  ecb-working-celeron-strings))
	;; All the % signs because it then gets passed to message.
	(t (ecb-working-frame-animation-display length number
					    ecb-working-celeron-strings))))



(defun ecb-working-dynamic-status (&optional number)
  "show the status. If NUMBER is nil, then increment a local NUMBER from 0
with each call. If it is a number or float, use it as the raw percentile."
  (let* ((n (or number ecb-working-ref1))
         (m1 (funcall 'format ecb-working-message))
         (m2 (ecb-working-celeron-display (length m1) n)))
    (ecb-nolog-message "%s%s" m1 m2)
    (setq ecb-working-ref1 (1+ ecb-working-ref1))))

(defmacro ecb-working-status-timeout (timeout message donestr &rest forms)
  "Contain a block of code during which working status is shown.
The code may call `sit-for' or `accept-process-output', so a timer
is needed to update the message.
TIMEOUT is the length of time to wait between message updates.
MESSAGE is the message string to use and DONESTR is the completed text
to use when the functions `ecb-working-status' is called from FORMS."
  (let ((current-message (make-symbol "ecb-working-current-message")))
    `(let* ((,current-message (current-message))
            (ecb-working-message ,message)
            (ecb-working-donestring ,donestr)
            (ecb-working-ref1 0)
            (time ,timeout)
            (ecb-working-timer
             (ecb-run-with-timer time time 'ecb-working-dynamic-status)))
       (unwind-protect
           (progn ,@forms)
         (ecb-cancel-timer ecb-working-timer)
         (ecb-working-dynamic-status t)
         (message ,current-message)))))


(defun ecb-working-status-call-process
  (timeout message donestr program &optional infile buffer display &rest args)
  "Display working messages while running a process.
TIMEOUT is how fast to display the messages.
MESSAGE is the message to show, and DONESTR is the string to add when done.
CALLPROCESSARGS are the same style of args as passed to `call-process'.
The are: PROGRAM, INFILE, BUFFER, DISPLAY, and ARGS.
Since it actually calls `start-process', not all features will work."
  (ecb-working-status-timeout timeout message donestr
    (let ((proc (apply 'start-process "ecb-working"
                       (if (listp buffer) (car buffer) buffer)
                       program args)))
      (set-process-sentinel proc 'list)
      (while (eq (process-status proc) 'run)
	(accept-process-output proc)
	;; accept-process-output caused my Solaris Emacs 20.3 to crash.
	;; If this is unreliable for you, use the below which will work
	;; in that situation.
	;; (if (not (sit-for timeout)) (read-event))
	))))

(defun ecb-position (seq elem)
  "Return the position of ELEM within SEQ counting from 0. Comparison is done
with `equal'."
  (if (listp seq)
      (let ((pos (- (length seq) (length (member elem seq)))))
        (if (= pos (length seq))
            nil
          pos))
    (catch 'found
      (dotimes (i (length seq))
        (if (equal elem (aref seq i))
            (throw 'found i)))
      nil)))

(defun ecb-last (seq)
  "Return the last elem of the sequence SEQ."
  (if (listp seq)
      (car (last seq))
    (if seq
        (aref seq (1- (length seq)))
      nil)))

(defun ecb-first (seq)
  "Return the first elem of the sequence SEQ."
  (if (listp seq)
      (car seq)
    (if seq
        (aref seq 0)
      nil)))
  

(defun ecb-next-listelem (list elem &optional nth-next)
  "Return that element of LIST which follows directly ELEM when ELEM is an
element of LIST. If ELEM is the last element of LIST then return the first
element of LIST. If ELEM is not an element of LIST nil is returned. Elements
are compared with `equal'.

If NTH-NEXT is an integer then the NTH-NEXT element of LIST in the meaning
described above is returned, i.e. the algorithm above is applied NTH-NEXT
times. Example: Suppose LIST = '\(a b c d), ELEM is 'c and NTH-NEXT = 3 then
'b is returned - same result for NTH-NEXT = 7, 11... It works also for
negative integers, so when NTH-NEXT is -1 in the example above then 'b is
returned."
  (let ((elem-pos (ecb-position list elem))
        (next (or nth-next 1)))
    (and elem-pos
         (nth (mod (+ elem-pos next)
                   (length list))
              list))))

(defun ecb-buffer-name (buffer-or-name)
  "Return the buffer-name of BUFFER-OR-NAME."
  (cond ((stringp buffer-or-name)
         buffer-or-name)
        ((bufferp buffer-or-name)
         (buffer-name buffer-or-name))
        (t
         nil)))

(defun ecb-buffer-obj (buffer-or-name)
  "Return the buffer-object of BUFFER-OR-NAME."
  (cond ((stringp buffer-or-name)
         (get-buffer buffer-or-name))
        ((bufferp buffer-or-name)
         buffer-or-name)
        (t
         nil)))

(defun ecb-file-content-as-string (file)
  "If FILE exists and is readable returns the contents as a string otherwise
return nil.
Note: No major/minor-mode is activated and no local variables are evaluated
for FILE, but proper EOL-conversion and character interpretation is done!"
  (let ((exp-filename (expand-file-name file)))
    (if (and (file-exists-p exp-filename)
             (file-readable-p exp-filename))
        (with-temp-buffer
          (insert-file-contents exp-filename)
          (buffer-string)))))

(defun ecb-current-buffer-archive-extract-p ()
  "Return not nil if current buffer was extracted of an archive which is in
`tar-mode' or `archive-mode'. For this the current buffer has either to be in
minor-mode `tar-subfile-mode' or `archive-subfile-mode'."
  (or (and (boundp 'tar-subfile-mode)
           tar-subfile-mode)
      (and (boundp 'archive-subfile-mode)
           archive-subfile-mode)))

(defun ecb-buffer-or-file-readable-p (&optional filename)
  "Checks if a buffer or a file is a readable file in the sense of ECB which
means either a real physical file or an auto-extracted file from an archive.
See `ecb-current-buffer-archive-extract-p'. FILENAME is either a filename or
nil whereas in the latter case the current-buffer is assumed."
  (let* ((file (or filename (buffer-file-name (current-buffer)))))
    (or (and file (file-readable-p file))
        (and (not ecb-running-xemacs)
             (if filename
                 (save-excursion
                   (set-buffer (find-file-noselect filename))
                   (ecb-current-buffer-archive-extract-p))
               (ecb-current-buffer-archive-extract-p))))))

(defun ecb-fit-str-to-width (str width from)
  "If STR is longer than WIDTH then fit it to WIDTH by stripping from left or
right \(depends on FROM which can be 'left or 'right) and prepend \(rsp.
append) \"...\" to signalize that the string is stripped. If WIDTH >= length
of STR the always STR is returned. If either WIDTH or length of STR is < 5
then an empty string is returned because stripping makes no sense here."
  (let ((len-str (length str)))
    (if (>= width len-str)
        str
      (if (or (< len-str 5) ;; we want at least two characters visible of str
              (< width 5))
          ""
        (if (equal from 'left)
            (concat "..." (substring str (* -1 (- width 3))))
          (concat (substring str 0 (- width 3)) "..."))))))

(defun ecb-make-windows-not-dedicated (&optional frame)
  "Make all windows of FRAME not dedicated."
  (mapc (function (lambda (w)
                    (set-window-dedicated-p w nil)))
        (ecb-window-list (or frame (selected-frame)))))

(defun ecb-set-windows-dedicated-state (buf-list state)
  "For every buffer in BUF-LIST set its windows dedicated-state to STATE if
visible in the `ecb-frame'."
  (mapc (function (lambda (b)
                    (when (get-buffer-window b ecb-frame)
                      (set-window-dedicated-p
                       (get-buffer-window b ecb-frame) state))))
        buf-list))


(defun ecb-window-number (&optional window)
  "Return the number of WINDOW or - if nil - of the current selected window.
The left-top-most window of the ecb-frame has number 0. The other windows have
the same ordering as `other-window' would walk through the frame."
  (1- (length (memq (or window (selected-window))
                    (nreverse (if (not ecb-running-emacs-21)
                                  ;; TODO: Klaus Berndl <klaus.berndl@sdm.de>:
                                  ;; There seems to be a mysterious behavior of
                                  ;; `ecb-window-list' when changing one buffer,
                                  ;; immediately opening another buffer and
                                  ;; scrolling sown to bottom of the new buffer
                                  ;; - then if this function is added to the
                                  ;;   modeline via (:eval...) the new buffer
                                  ;;   scrolls autom. back to beginng of
                                  ;;   buffer.
                                  ;; With the original window-list all is ok...
                                  (ecb-window-list
                                   ecb-frame 0
                                   (frame-first-window ecb-frame))
                                (window-list)))))))


(defun ecb-buffer-local-value (sym buffer)
  "Get the buffer-local value of variable SYM in BUFFER. If there is no
buffer-local value in BUFFER then the global value of SYM is used."
  (if (fboundp 'buffer-local-value)
      (buffer-local-value sym buffer)
    (or (cdr (assoc sym (buffer-local-variables buffer)))
        (save-excursion
          (set-buffer buffer)
          (symbol-value sym)))))



;; ringstuff

(require 'ring)
(defalias 'ecb-make-ring 'make-ring)
(defalias 'ecb-ring-p 'ring-p)
(defalias 'ecb-ring-empty-p 'ring-empty-p)
(defalias 'ecb-ring-insert 'ring-insert)
(defalias 'ecb-ring-ref 'ring-ref)
;; at least XEmacs does not have this function.
(defun ecb-ring-elements (ring)
  "Return a list of the lements of RING."
  (mapcar #'identity (cddr ring)))

(defvar ecb-max-submenu-depth 4
  "The maximum depth of nesting submenus for the tree-buffers.")

(defun ecb-create-menu-user-ext-type (curr-level max-level)
  "Creates the :type-definition for the *-menu-user-extension options.
This allows nested submenus for the popup-menus of the tree-buffers up to a
maximum level of MAX-LEVEL. CURR-LEVEL must be 1 when used in a
defcustom-clause and has to be <= MAX-LEVEL."
  (list 'repeat (delq nil
                      (list 'choice ':tag "Menu-entry" ':menu-tag "Menu-entry"
                            ':value '(ignore "")
                            (list 'const ':tag "Separator" ':value '("---"))
                            (list 'list ':tag "Menu-command"
                                  (list 'function ':tag "Function" ':value 'ignore)
                                  (list 'string ':tag "Entry-name"))
                            (if (= curr-level max-level)
                                nil
                              (list 'cons ':tag "Submenu"
                                    (list 'string ':tag "Submenu-title")
                                    (ecb-create-menu-user-ext-type (1+ curr-level)
                                                                   max-level)))))))
(silentcomp-provide 'ecb-util)

;;; ecb-util.el ends here
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