Hi List, 

I ported this from outshine.el (i.e. outline-minor-mode) to Org-mode,
hope it is useful. 

What is it all about? With 'org-hlc' 

| Behind every folded headline, a little 'cookie' shows the number of
| hidden lines till the next visible headline.


| * my-file.org [#13]
| ** Commentary [#1]
| *** About my-file
|  This file implements extensions for occur-mode. You can think of a
|  navi-buffer as a kind of 'remote-control' for an (adecuately)
|  outline-structured original-buffer.
| *** Usage [#165]

I attach the code to this message, you can find the git-repo here:

| https://github.com/tj64/org-hlc
| git clone https://github.com/tj64/org-hlc

Please let me know if there is interest to include this in Org-mode. 


;;; org-hlc.el --- hidden-lines-cookies for folded Org-mode headlines

;; Copyright (C) 2013 Thorsten Jolitz

;; Author: Thorsten Jolitz <tjolitz at gmail dot com>
;; Keywords: org-mode, outline, visibility, overlays

;; This file is (NOT YET) part of GNU Emacs.

;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; 'hidden-lines-cookies' (hlc) are small cookies at the end of each folded
;; (and visible) headline in an Org-mode buffer that show the number of hidden
;; lines before the next visible headline.

;; hidden-lines-cookies can be handled with three user commands:
;; `org-hlc-show-hidden-lines-cookies', `org-hlc-hide-hidden-lines-cookies',
;; and the convenience command `org-hlc-toggle-hidden-lines-cookies' that
;; toggles between the two other commands conditional on the last one
;; executed.

;; The appearance of the cookies can be customized by changing the values of
;; four customizable variables: `org-hlc-hidden-lines-cookie-left-delimiter'
;; (with default value "["), `org-hlc-hidden-lines-cookie-right-delimiter'
;; (with default value ']), `org-hlc-hidden-lines-cookie-left-signal-char'
;; (with default value "#") and
;; `org-hlc-hidden-lines-cookie-right-signal-char' (with default value "").

;; Thus an exemplary folded headline with 165 hidden lines before the next
;; visible headline might look like this when hidden-lines-cookies are shown:

;; ,-----------------
;; | *** Headline [#165]
;; `-----------------

;;; Code:

;;;; Variables

(defvar org-hlc-hidden-lines-cookies-on-p nil
  "If non-nil, hidden-lines cookies are shown, otherwise hidden.")

(defgroup org-hlc nil
  "Enhanced library for outline navigation in source code buffers."
  :prefix "org-hlc-"
  :group 'org)

(defcustom org-hlc-hidden-lines-cookie-left-delimiter "["
  "Left delimiter of cookie that shows number of hidden lines."
  :group 'org-hlc
  :type 'string)

(defcustom org-hlc-hidden-lines-cookie-right-delimiter "]"
  "Left delimiter of cookie that shows number of hidden lines."
  :group 'org-hlc
  :type 'string)

(defcustom org-hlc-hidden-lines-cookie-left-signal-char "#"
  "Left signal character of cookie that shows number of hidden lines."
  :group 'org-hlc
  :type 'string)

(defcustom org-hlc-hidden-lines-cookie-right-signal-char ""
  "Right signal character of cookie that shows number of hidden lines."
  :group 'org-hlc
  :type 'string)

(defvar org-hlc-hidden-lines-cookie-format-regexp
   "\\( "
   (regexp-quote org-hlc-hidden-lines-cookie-left-delimiter)
   (regexp-quote org-hlc-hidden-lines-cookie-left-signal-char)
   (regexp-quote org-hlc-hidden-lines-cookie-right-signal-char)
   ;; FIXME robust enough?
   (format "\\%s" org-hlc-hidden-lines-cookie-right-delimiter)
  "Matches cookies that show number of hidden lines for folded subtrees.")

;;;; Functions

;; Calc and show line number of hidden body for all visible headlines
(defun org-hlc-write-hidden-lines-cookies ()
  "Show line number of hidden lines in folded headline."
    (goto-char (point-min))
    (and (outline-on-heading-p)
    (while (not (eobp))
      (outline-next-visible-heading 1)
      (and (outline-on-heading-p)

(defun org-hlc-hidden-lines-cookie-status-changed-p ()
  "Return non-nil if hidden-lines cookie needs modification."
      (or (not (outline-body-visible-p))

(defun org-hlc-set-hidden-lines-cookie ()
  "Calculate and set number of hidden lines in folded headline."
  (let* ((folded-p (not (outline-body-visible-p)))
         (line-num-current-header (line-number-at-pos))
            (outline-next-visible-heading 1)
          (1- (- line-num-next-visible-header line-num-current-header))))
    (if (re-search-forward
         ((not folded-p) (replace-match ""))
         (folded-p (replace-match (format "%s" body-lines) nil nil nil 2)))
          " %s%s%s%s%s"

(defun org-hlc-show-hidden-lines-cookies ()
  "Show hidden-lines cookies for all visible and folded headlines."
  (setq org-hlc-hidden-lines-cookies-on-p 1))

(defun org-hlc-hide-hidden-lines-cookies ()
  "Delete all hidden-lines cookies."
  (let* ((base-buf (point-marker))
           (buffer-name (marker-buffer base-buf)))))
    (clone-indirect-buffer indirect-buf-name nil 'NORECORD)
      (switch-to-buffer indirect-buf-name)
      (let ((indirect-buf (point-marker)))
        (switch-to-buffer (marker-buffer base-buf))
        (kill-buffer (marker-buffer indirect-buf))
        (set-marker indirect-buf nil))
      (set-marker base-buf nil)))
  (setq org-hlc-hidden-lines-cookies-on-p nil))

(defun org-hlc-toggle-hidden-lines-cookies ()
  "Toggles status of hidden-lines cookies between shown and hidden."
  (if org-hlc-hidden-lines-cookies-on-p

(provide 'org-hlc)

;; Local variables:
;; generated-autoload-file: "org-loaddefs.el"
;; End:

;;; org-hlc.el ends here


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