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+;;; org-annotate-file.el --- Annotate a file with org syntax
+
+;; Copyright (C) 2008-2012 Philip Jackson
+
+;; Author: Philip Jackson <phil@shellarchive.co.uk>
+;; Version: 0.2
+
+;; This file is not currently part of GNU Emacs.
+
+;; 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 this program ; see the file COPYING.  If not, write to
+;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This is yet another implementation to allow the annotation of a
+;; file without modification of the file itself. The annotation is in
+;; org syntax so you can use all of the org features you are used to.
+
+;; To use you might put the following in your .emacs:
+;;
+;; (require 'org-annotate-file)
+;; (global-set-key (kbd "C-c C-l") 'org-annotate-file) ; for example
+;;
+;; To change the location of the annotation file:
+;;
+;; (setq org-annotate-file-storage-file "~/annotated.org")
+;;
+;; Then when you visit any file and hit C-c C-l you will find yourself
+;; in an org buffer on a headline which links to the file you were
+;; visiting, e.g:
+
+;; * ~/org-annotate-file.el
+
+;; Under here you can put anything you like, save the file
+;; and next time you hit C-c C-l you will hit those notes again.
+;;
+;; To put a subheading with a text search for the current line set
+;; `org-annotate-file-add-search` to non-nil value. Then when you hit
+;; C-c C-l (on the above line for example) you will get:
+
+;; * ~/org-annotate-file.el
+;; ** `org-annotate-file-add-search` to non-nil value. Then whe...
+
+;; Note that both of the above will be links.
+
+(require 'org)
+
+(defvar org-annotate-file-storage-file "~/.org-annotate-file.org"
+  "File in which to keep annotations.")
+
+(defvar org-annotate-file-add-search nil
+  "If non-nil then add a link as a second level to the actual
+location in the file")
+
+(defvar org-annotate-file-always-open t
+  "non-nil means always expand the full tree when you visit
+`org-annotate-file-storage-file'.")
+
+(defun org-annotate-file-elipsify-desc (string &optional after)
+  "Strip starting and ending whitespace and replace any chars
+that appear after the value in `after' with '...'"
+  (let* ((after (number-to-string (or after 30)))
+         (replace-map (list (cons "^[ \t]*" "")
+                            (cons "[ \t]*$" "")
+                            (cons (concat "^\\(.\\{" after
+                                          "\\}\\).*") "\\1..."))))
+    (mapc (lambda (x)
+            (when (string-match (car x) string)
+              (setq string (replace-match (cdr x) nil nil string))))
+          replace-map)
+    string))
+
+(defun org-annotate-file ()
+  "Put a section for the current file into your annotation file"
+  (interactive)
+  (unless (buffer-file-name)
+    (error "This buffer has no associated file"))
+  (org-annotate-file-show-section))
+
+(defun org-annotate-file-show-section (&optional buffer)
+  "Visit the buffer named `org-annotate-file-storage-file' and
+show the relevant section"
+  (let* ((filename (abbreviate-file-name (or buffer (buffer-file-name))))
+         (line (buffer-substring-no-properties (point-at-bol) (point-at-eol)))
+         (link (org-make-link-string (concat "file:" filename) filename))
+         (search-link (org-make-link-string
+                       (concat "file:" filename "::" line)
+                               (org-annotate-file-elipsify-desc line))))
+    (with-current-buffer (find-file org-annotate-file-storage-file)
+      (unless (eq major-mode 'org-mode)
+        (org-mode))
+      (goto-char (point-min))
+      (widen)
+      (when org-annotate-file-always-open
+        (show-all))
+      (unless (search-forward-regexp
+               (concat "^* " (regexp-quote link)) nil t)
+        (org-annotate-file-add-upper-level link))
+      (beginning-of-line)
+      (org-narrow-to-subtree)
+      ;; deal with a '::' search if need be
+      (when org-annotate-file-add-search
+        (unless (search-forward-regexp
+                 (concat "^** " (regexp-quote search-link)) nil t)
+          (org-annotate-file-add-second-level search-link))))))
+
+(defun org-annotate-file-add-upper-level (link)
+  (goto-char (point-min))
+  (call-interactively 'org-insert-heading)
+  (insert link))
+
+(defun org-annotate-file-add-second-level (link)
+  (goto-char (point-at-eol))
+  (call-interactively 'org-insert-subheading)
+  (insert link))
+
+(provide 'org-annotate-file)
+
+;;; org-annotate-file.el ends here