bug#14029: 24.2.50; [PATCH] imenu problems with special elements

[Andreas Politz]

,----[ (info "(elisp) Imenu") ]
| Special elements look like this:
| 
|           (INDEX-NAME INDEX-POSITION FUNCTION ARGUMENTS...)
| 
|      Selecting a special element performs:
| 
|           (funcall FUNCTION
|                    INDEX-NAME INDEX-POSITION ARGUMENTS...)
`----

1. At least one function does not recognize these elements, resulting
in an error.

2. The advertised calling convention is different from the actual one in
`imenu'.

3. The `imenu--subalist-p' predicate is unsafe and incomplete.

Andreas

diff -c -L /home/politza/src/emacs/trunk/lisp/imenu.el -L \#\<buffer\ 
imenu.el\> /home/politza/src/emacs/trunk/lisp/imenu.el 
/tmp/buffer-content-3095O-q
*** /home/politza/src/emacs/trunk/lisp/imenu.el
--- #<buffer imenu.el>
***************
*** 286,293 ****
  
  
  (defun imenu--subalist-p (item)
!   (and (consp (cdr item)) (listp (cadr item))
!        (not (eq (car (cadr item)) 'lambda))))
  
  (defmacro imenu-progress-message (_prevpos &optional _relpos _reverse)
    "Macro to display a progress message.
--- 286,295 ----
  
  
  (defun imenu--subalist-p (item)
!   (and (consp item)
!        (consp (cdr item))
!        (listp (cadr item))
!        (not (functionp (cadr item)))))
  
  (defmacro imenu-progress-message (_prevpos &optional _relpos _reverse)
    "Macro to display a progress message.
***************
*** 641,647 ****
        ;; We are only interested in the bottom-level elements, so we need to
        ;; recurse if TAIL is a list.
        (cond ((listp tail)
!            (if (setq res (imenu--in-alist str tail))
                 (setq alist nil)))
            ((if imenu-name-lookup-function
                   (funcall imenu-name-lookup-function str head)
--- 643,650 ----
        ;; We are only interested in the bottom-level elements, so we need to
        ;; recurse if TAIL is a list.
        (cond ((listp tail)
!            (if (and (imenu--subalist-p elt)
!                       (setq res (imenu--in-alist str tail)))
                 (setq alist nil)))
            ((if imenu-name-lookup-function
                   (funcall imenu-name-lookup-function str head)
***************
*** 1024,1030 ****
                (nth 2 index-item) imenu-default-goto-function))
           (position (if is-special-item
                         (cadr index-item) (cdr index-item)))
!          (rest (if is-special-item (cddr index-item))))
        (apply function (car index-item) position rest))
      (run-hooks 'imenu-after-jump-hook)))
  
--- 1027,1033 ----
                (nth 2 index-item) imenu-default-goto-function))
           (position (if is-special-item
                         (cadr index-item) (cdr index-item)))
!          (rest (if is-special-item (cdddr index-item))))
        (apply function (car index-item) position rest))
      (run-hooks 'imenu-after-jump-hook)))
  

Diff finished.  Fri Mar 22 02:15:09 2013