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+;;; org-track.el --- Track the most recent Org-mode version available.
+;;
+;; Copyright (C) 2009
+;;   Free Software Foundation, Inc.
+;;
+;; Author: Bastien Guerry <bzg at altern dot org>
+;;         Eric S Fraga   <e.fraga at ucl.ac dot uk>
+;;         Sebastian Rose <sebastian_rose at gmx dot de>
+;;         The Worg people http://orgmode.org/worg/
+;; Keywords: outlines, hypermedia, calendar, wp
+;; Homepage: http://orgmode.org
+;; Version: 6.29a
+;;
+;; Released under the GNU General Public License version 3
+;; see: http://www.gnu.org/licenses/gpl-3.0.html
+;;
+;; This file is 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
+;; 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.  If not, see <http://www.gnu.org/licenses/>.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;;; Commentary:
+;;
+;; Download the latest development tarball, unpack and optionally compile it
+;;
+;; Usage:
+;;
+;;   (require 'org-track)
+;;
+;;   ;; ... somewhere in your setup (use customize):
+;;
+;;   (setq org-track-directory "~/test/")
+;;   (setq org-track-compile-sources nil)
+;;   (setq org-track-remove-package t)
+;;
+;;   M-x org-track-update RET
+
+
+
+(require 'url-parse)
+(require 'url-handlers)
+(autoload 'url-file-local-copy "url-handlers")
+(autoload 'url-generic-parse-url "url-parse")
+
+
+
+
+
+;;; Variables:
+
+(defgroup org-track nil
+  "Track the most recent Org-mode version available.
+
+To use org-track, adjust `org-track-directory'.
+Org will download the archived latest git version for you,
+unpack it into that directory (i.e. a subdirectory
+`org-mode/' is added), create the autoloads file
+`org-install.el' for you and, optionally, compile the
+sources.
+All you'll have to do is call `M-x org-track-update' from
+time to time."
+  :version "22.1"
+  :group 'org)
+
+(defcustom org-track-directory "~/.emacs.d/org/lisp"
+  "Directory where your org-mode/ directory lives.
+If that directory does not exist, it will be created."
+  :type 'directory)
+
+(defcustom org-track-compile-sources t
+  "If `nil', never compile org-sources.
+Org will only create the autoloads file `org-install.el' for
+you then. If `t', compile the sources, too.
+Note, that emacs preferes compiled elisp files over
+non-compiled ones."
+  :type 'boolean)
+
+(defcustom org-track-org-url "http://orgmode.org/"
+  "The URL where the package to download can be found.
+Please append a slash."
+  :type 'string)
+
+(defcustom org-track-org-package "org-latest.tar.gz"
+  "The basename of the package you use.
+Defaults to the development version of Org-mode.
+This should be a *.tar.gz package, since emacs provides all
+you need to unpack it."
+  :type 'string)
+
+(defcustom org-track-remove-package nil
+  "Remove org-latest.tar.gz after updates?"
+  :type 'boolean)
+
+
+
+
+
+;;; Frontend
+
+(defun org-track-update ()
+  "Update to current Org-mode version.
+Also, generate autoloads and evtl. compile the sources."
+  (interactive)
+  (let* ((base (file-truename org-track-directory))
+         (org-exists (file-exists-p
+                      (file-truename
+                       (concat base "/org-mode/lisp/org.el"))))
+         (nobase (not (file-directory-p
+                       (file-truename org-track-directory)))))
+    (if nobase
+        (when (y-or-n-p
+               (format "Directory %s does not exist. Create it?" base))
+          (make-directory base t)
+          (setq nobase nil)))
+    (if nobase
+        (message "Not creating %s - giving up." org-track-directory)
+      (condition-case err
+          (progn
+            (org-track-fetch-package)
+            (org-track-compile-org))
+        (error (message "%s" (error-message-string err)))))))
+
+
+
+
+;;; tar related functions
+
+;; `url-retrieve-synchronously' fetches files synchronously. How can we ensure
+;; that? If the maintainers of that package decide, that an assynchronous
+;; download might be better??? (used by `url-file-local-copy')
+
+;;;###autoload
+(defun org-track-fetch-package (&optional directory)
+  "Fetch Org package depending on `org-track-fetch-package-extension'.
+If DIRECTORY is defined, unpack the package there, i.e. add the
+subdirectory org-mode/ to DIRECTORY."
+  (interactive "Dorg-track directory: ")
+  (let* ((pack (concat
+                (if (string-match "/$" org-track-org-url)
+                    org-track-org-url
+                  (concat org-track-org-url "/"))
+                org-track-org-package))
+         (base (file-truename
+                (or directory org-track-directory)))
+         (target (file-truename
+                  (concat base "/" org-track-org-package)))
+         url download tarbuff)
+    (message "Fetching to %s - this might take some time..."  base)
+    (setq url (url-generic-parse-url pack))
+    (setq download (url-file-local-copy url)) ;; errors if fail
+    (copy-file download target t)
+    (delete-file download)
+    ;; (tar-mode) leads to dubious errors. We use the auto-mode-alist to
+    ;; ensure tar-mode is used:
+    (add-to-list 'auto-mode-alist '("org-latest\\.tar\\.gz\\'" . tar-mode))
+    (setq tarbuff (find-file target))
+    (with-current-buffer tarbuff ;; with-temp-buffer does not work with tar-mode??
+      (tar-untar-buffer))
+    (kill-buffer tarbuff)
+    (if org-track-remove-package
+        (delete-file target))))
+
+
+
+
+;;; Compile Org-mode sources
+
+
+;;;###autoload
+(defun org-track-compile-org (&optional directory)
+  "Compile all *.el files that come with org-mode.
+Generate the autoloads file `org-install.el'.
+
+DIRECTORY is where the directory org-mode/ lives (i.e. the
+          parent directory of your local repo."
+  (interactive)
+  ;; file-truename expands the filename and removes double slash, if exists:
+  (setq directory (file-truename
+                   (concat
+                    (or directory
+                        (file-truename (concat org-track-directory "/org-mode/lisp")))
+                    "/")))
+  (add-to-list 'load-path directory)
+  (let ((list-of-org-files (file-expand-wildcards (concat directory "*.el"))))
+    ;; create the org-install file
+    (require 'autoload)
+    (setq esf/org-install-file (concat directory "org-install.el"))
+    (find-file esf/org-install-file)
+    (erase-buffer)
+    (mapc (lambda (x)
+            (generate-file-autoloads x))
+          list-of-org-files)
+    (insert "\n(provide (quote org-install))\n")
+    (save-buffer)
+    (kill-buffer)
+    (byte-compile-file esf/org-install-file t)
+
+    (mapc (lambda (f)
+            (if (file-exists-p (concat f "c"))
+                (delete-file (concat f "c"))))
+          list-of-org-files)
+    (if org-track-compile-sources
+        (mapc (lambda (f) (byte-compile-file f)) list-of-org-files))))
+
+
+(provide 'org-track)
+
+;;; org-track.el ends here