X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/a971635315e259c076de020b3676c04d1dcc415e..f036e167feaf875873636972b28a4adc12c32254:/lisp/org/org-compat.el

diff --git a/lisp/org/org-compat.el b/lisp/org/org-compat.el
index a80f671ace..c3ccf062db 100644
--- a/lisp/org/org-compat.el
+++ b/lisp/org/org-compat.el
@@ -1,11 +1,10 @@
 ;;; org-compat.el --- Compatibility code for Org-mode
 
-;; Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+;; Copyright (C) 2004-2014 Free Software Foundation, Inc.
 
 ;; Author: Carsten Dominik <carsten at orgmode dot org>
 ;; Keywords: outlines, hypermedia, calendar, wp
 ;; Homepage: http://orgmode.org
-;; Version: 6.06b
 ;;
 ;; This file is part of GNU Emacs.
 ;;
@@ -30,7 +29,17 @@
 
 ;;; Code:
 
-(defconst org-xemacs-p (featurep 'xemacs)) ; not used by org.el itself
+(eval-when-compile
+  (require 'cl))
+
+(require 'org-macs)
+
+(declare-function w32-focus-frame "term/w32-win" (frame))
+
+;; The following constant is for backward compatibility.  We do not use
+;; it in org-mode, because the Byte compiler evaluates (featurep 'xemacs)
+;; at compilation time and can therefore optimize code better.
+(defconst org-xemacs-p (featurep 'xemacs))
 (defconst org-format-transports-properties-p
   (let ((x "a"))
     (add-text-properties 0 1 '(test t) x)
@@ -40,17 +49,25 @@
 (defun org-compatible-face (inherits specs)
   "Make a compatible face specification.
 If INHERITS is an existing face and if the Emacs version supports it,
-just inherit the face.  If not, use SPECS to define the face.
+just inherit the face.  If INHERITS is set and the Emacs version does
+not support it, copy the face specification from the inheritance face.
+If INHERITS is not given and SPECS is, use SPECS to define the face.
 XEmacs and Emacs 21 do not know about the `min-colors' attribute.
 For them we convert a (min-colors 8) entry to a `tty' entry and move it
 to the top of the list.  The `min-colors' attribute will be removed from
 any other entries, and any resulting duplicates will be removed entirely."
+  (when (and inherits (facep inherits) (not specs))
+    (setq specs (or specs
+		    (get inherits 'saved-face)
+		    (get inherits 'face-defface-spec))))
   (cond
    ((and inherits (facep inherits)
-	 (not (featurep 'xemacs)) (> emacs-major-version 22))
-    ;; In Emacs 23, we use inheritance where possible.
-    ;; We only do this in Emacs 23, because only there the outline
-    ;; faces have been changed to the original org-mode-level-faces.
+	 (not (featurep 'xemacs))
+	 (>= emacs-major-version 22)
+	 ;; do not inherit outline faces before Emacs 23
+	 (or (>= emacs-major-version 23)
+	     (not (string-match "\\`outline-[0-9]+"
+				(symbol-name inherits)))))
     (list (list t :inherit inherits)))
    ((or (featurep 'xemacs) (< emacs-major-version 22))
     ;; These do not understand the `min-colors' attribute.
@@ -69,25 +86,80 @@ any other entries, and any resulting duplicates will be removed entirely."
    (t specs)))
 (put 'org-compatible-face 'lisp-indent-function 1)
 
+(defun org-version-check (version feature level)
+  (let* ((v1 (mapcar 'string-to-number (split-string version "[.]")))
+	 (v2 (mapcar 'string-to-number (split-string emacs-version "[.]")))
+	 (rmaj (or (nth 0 v1) 99))
+	 (rmin (or (nth 1 v1) 99))
+	 (rbld (or (nth 2 v1) 99))
+	 (maj (or (nth 0 v2) 0))
+	 (min (or (nth 1 v2) 0))
+	 (bld (or (nth 2 v2) 0)))
+    (if (or (< maj rmaj)
+	    (and (= maj rmaj)
+		 (< min rmin))
+	    (and (= maj rmaj)
+		 (= min rmin)
+		 (< bld rbld)))
+	(if (eq level :predicate)
+	    ;; just return if we have the version
+	    nil
+	  (let ((msg (format "Emacs %s or greater is recommended for %s"
+			     version feature)))
+	    (display-warning 'org msg level)
+	    t))
+      t)))
+
+
 ;;;; Emacs/XEmacs compatibility
 
+(eval-and-compile
+  (defun org-defvaralias (new-alias base-variable &optional docstring)
+    "Compatibility function for defvaralias.
+Don't do the aliasing when `defvaralias' is not bound."
+    (declare (indent 1))
+    (when (fboundp 'defvaralias)
+      (defvaralias new-alias base-variable docstring)))
+
+  (when (and (not (boundp 'user-emacs-directory))
+	     (boundp 'user-init-directory))
+    (org-defvaralias 'user-emacs-directory 'user-init-directory)))
+
+(when (featurep 'xemacs)
+  (defadvice custom-handle-keyword
+    (around org-custom-handle-keyword
+	    activate preactivate)
+    "Remove custom keywords not recognized to avoid producing an error."
+    (cond
+     ((eq (ad-get-arg 1) :package-version))
+     (t ad-do-it)))
+  (defadvice define-obsolete-variable-alias
+    (around org-define-obsolete-variable-alias
+	    (obsolete-name current-name &optional when docstring)
+	    activate preactivate)
+    "Declare arguments defined in later versions of Emacs."
+    ad-do-it)
+  (defadvice define-obsolete-function-alias
+    (around org-define-obsolete-function-alias
+	    (obsolete-name current-name &optional when docstring)
+	    activate preactivate)
+    "Declare arguments defined in later versions of Emacs."
+    ad-do-it)
+  (defvar customize-package-emacs-version-alist nil)
+  (defvar temporary-file-directory (temp-directory)))
+
+;; Keys
+(defconst org-xemacs-key-equivalents
+  '(([mouse-1] . [button1])
+    ([mouse-2] . [button2])
+    ([mouse-3] . [button3])
+    ([C-mouse-4] . [(control mouse-4)])
+    ([C-mouse-5] . [(control mouse-5)]))
+  "Translation alist for a couple of keys.")
+
 ;; Overlay compatibility functions
-(defun org-make-overlay (beg end &optional buffer)
-  (if (featurep 'xemacs)
-      (make-extent beg end buffer)
-    (make-overlay beg end buffer)))
-(defun org-delete-overlay (ovl)
-  (if (featurep 'xemacs) (progn (delete-extent ovl) nil) (delete-overlay ovl)))
 (defun org-detach-overlay (ovl)
   (if (featurep 'xemacs) (detach-extent ovl) (delete-overlay ovl)))
-(defun org-move-overlay (ovl beg end &optional buffer)
-  (if (featurep 'xemacs)
-      (set-extent-endpoints ovl beg end (or buffer (current-buffer)))
-    (move-overlay ovl beg end buffer)))
-(defun org-overlay-put (ovl prop value)
-  (if (featurep 'xemacs)
-      (set-extent-property ovl prop value)
-    (overlay-put ovl prop value)))
 (defun org-overlay-display (ovl text &optional face evap)
   "Make overlay OVL display TEXT with face FACE."
   (if (featurep 'xemacs)
@@ -107,32 +179,35 @@ any other entries, and any resulting duplicates will be removed entirely."
     (if face (org-add-props text nil 'face face))
     (overlay-put ovl 'before-string text)
     (if evap (overlay-put ovl 'evaporate t))))
-(defun org-overlay-get (ovl prop)
-  (if (featurep 'xemacs)
-      (extent-property ovl prop)
-    (overlay-get ovl prop)))
-(defun org-overlays-at (pos)
-  (if (featurep 'xemacs) (extents-at pos) (overlays-at pos)))
-(defun org-overlays-in (&optional start end)
-  (if (featurep 'xemacs)
-      (extent-list nil start end)
-    (overlays-in start end)))
-(defun org-overlay-start (o)
-  (if (featurep 'xemacs) (extent-start-position o) (overlay-start o)))
-(defun org-overlay-end (o)
-  (if (featurep 'xemacs) (extent-end-position o) (overlay-end o)))
-(defun org-overlay-buffer (o)
-  (if (featurep 'xemacs) (extent-buffer o) (overlay-buffer o)))
 (defun org-find-overlays (prop &optional pos delete)
   "Find all overlays specifying PROP at POS or point.
 If DELETE is non-nil, delete all those overlays."
-  (let ((overlays (org-overlays-at (or pos (point))))
+  (let ((overlays (overlays-at (or pos (point))))
 	ov found)
     (while (setq ov (pop overlays))
-      (if (org-overlay-get ov prop)
-          (if delete (org-delete-overlay ov) (push ov found))))
+      (if (overlay-get ov prop)
+          (if delete (delete-overlay ov) (push ov found))))
     found))
 
+(defun org-get-x-clipboard (value)
+  "Get the value of the x or Windows clipboard, compatible with XEmacs, and GNU Emacs 21."
+  (cond ((eq window-system 'x)
+	 (let ((x (org-get-x-clipboard-compat value)))
+	   (if x (org-no-properties x))))
+	((and (eq window-system 'w32) (fboundp 'w32-get-clipboard-data))
+	 (w32-get-clipboard-data))))
+
+(defsubst org-decompose-region (beg end)
+  "Decompose from BEG to END."
+  (if (featurep 'xemacs)
+      (let ((modified-p (buffer-modified-p))
+	    (buffer-read-only nil))
+	(remove-text-properties beg end '(composition nil))
+	(set-buffer-modified-p modified-p))
+    (decompose-region beg end)))
+
+;; Miscellaneous functions
+
 (defun org-add-hook (hook function &optional append local)
   "Add-hook, compatible with both Emacsen."
   (if (and local (featurep 'xemacs))
@@ -148,10 +223,53 @@ that will be added to PLIST.  Returns the string that was modified."
   string)
 (put 'org-add-props 'lisp-indent-function 2)
 
+(defun org-fit-window-to-buffer (&optional window max-height min-height
+					   shrink-only)
+  "Fit WINDOW to the buffer, but only if it is not a side-by-side window.
+WINDOW defaults to the selected window.  MAX-HEIGHT and MIN-HEIGHT are
+passed through to `fit-window-to-buffer'.  If SHRINK-ONLY is set, call
+`shrink-window-if-larger-than-buffer' instead, the height limit is
+ignored in this case."
+  (cond ((if (fboundp 'window-full-width-p)
+	     (not (window-full-width-p window))
+	   ;; do nothing if another window would suffer
+	   (> (frame-width) (window-width window))))
+	((and (fboundp 'fit-window-to-buffer) (not shrink-only))
+	 (fit-window-to-buffer window max-height min-height))
+	((fboundp 'shrink-window-if-larger-than-buffer)
+	 (shrink-window-if-larger-than-buffer window)))
+  (or window (selected-window)))
+
+(defun org-number-sequence (from &optional to inc)
+  "Call `number-sequence or emulate it."
+  (if (fboundp 'number-sequence)
+      (number-sequence from to inc)
+    (if (or (not to) (= from to))
+	(list from)
+      (or inc (setq inc 1))
+      (when (zerop inc) (error "The increment can not be zero"))
+      (let (seq (n 0) (next from))
+	(if (> inc 0)
+	    (while (<= next to)
+	      (setq seq (cons next seq)
+		    n (1+ n)
+		    next (+ from (* n inc))))
+	  (while (>= next to)
+	    (setq seq (cons next seq)
+		  n (1+ n)
+		  next (+ from (* n inc)))))
+	(nreverse seq)))))
+
+;; `set-transient-map' is only in Emacs >= 24.4
+(defalias 'org-set-transient-map
+  (if (fboundp 'set-transient-map)
+      'set-transient-map
+    'set-temporary-overlay-map))
+
 ;; Region compatibility
 
 (defvar org-ignore-region nil
-  "To temporarily disable the active region.")
+  "Non-nil means temporarily disable the active region.")
 
 (defun org-region-active-p ()
   "Is `transient-mark-mode' on and the region active?
@@ -164,20 +282,24 @@ Works on both Emacs and XEmacs."
 	  (use-region-p)
 	(and transient-mark-mode mark-active))))) ; Emacs 22 and before
 
-;; Invisibility compatibility
+(defun org-cursor-to-region-beginning ()
+  (when (and (org-region-active-p)
+	     (> (point) (region-beginning)))
+    (exchange-point-and-mark)))
 
-(defun org-add-to-invisibility-spec (arg)
-  "Add elements to `buffer-invisibility-spec'.
-See documentation for `buffer-invisibility-spec' for the kind of elements
-that can be added."
-  (cond
-   ((fboundp 'add-to-invisibility-spec)
-    (add-to-invisibility-spec arg))
-   ((or (null buffer-invisibility-spec) (eq buffer-invisibility-spec t))
-	(setq buffer-invisibility-spec (list arg)))
-   (t
-    (setq buffer-invisibility-spec
-	  (cons arg buffer-invisibility-spec)))))
+;; Emacs 22 misses `activate-mark'
+(if (fboundp 'activate-mark)
+    (defalias 'org-activate-mark 'activate-mark)
+  (defun org-activate-mark ()
+    (when (mark t)
+      (setq mark-active t)
+      (when (and (boundp 'transient-mark-mode)
+		 (not transient-mark-mode))
+	(set (make-local-variable 'transient-mark-mode) 'lambda))
+      (when (boundp 'zmacs-regions)
+	(setq zmacs-regions t)))))
+
+;; Invisibility compatibility
 
 (defun org-remove-from-invisibility-spec (arg)
   "Remove elements from `buffer-invisibility-spec'."
@@ -193,61 +315,262 @@ that can be added."
       (member arg buffer-invisibility-spec)
     nil))
 
+(defmacro org-xemacs-without-invisibility (&rest body)
+  "Turn off extents with invisibility while executing BODY."
+  `(let ((ext-inv (extent-list nil (point-at-bol) (point-at-eol)
+			       'all-extents-closed-open 'invisible))
+	 ext-inv-specs)
+     (dolist (ext ext-inv)
+       (when (extent-property ext 'invisible)
+	 (add-to-list 'ext-inv-specs (list ext (extent-property
+						ext 'invisible)))
+	 (set-extent-property ext 'invisible nil)))
+     ,@body
+     (dolist (ext-inv-spec ext-inv-specs)
+       (set-extent-property (car ext-inv-spec) 'invisible
+			    (cadr ext-inv-spec)))))
+(def-edebug-spec org-xemacs-without-invisibility (body))
+
 (defun org-indent-to-column (column &optional minimum buffer)
   "Work around a bug with extents with invisibility in XEmacs."
- (if (featurep 'xemacs)
-     (let ((ext-inv (extent-list
-                     nil (point-at-bol) (point-at-eol)
-                     'all-extents-closed-open 'invisible))
-           ext-inv-specs)
-       (dolist (ext ext-inv)
-         (when (extent-property ext 'invisible)
-           (add-to-list 'ext-inv-specs (list ext (extent-property
-						  ext 'invisible)))
-           (set-extent-property ext 'invisible nil)))
-       (indent-to-column column minimum buffer)
-       (dolist (ext-inv-spec ext-inv-specs)
-         (set-extent-property (car ext-inv-spec) 'invisible
-			      (cadr ext-inv-spec))))
-   (indent-to-column column minimum)))
+  (if (featurep 'xemacs)
+      (org-xemacs-without-invisibility (indent-to-column column minimum buffer))
+    (indent-to-column column minimum)))
 
 (defun org-indent-line-to (column)
   "Work around a bug with extents with invisibility in XEmacs."
- (if (featurep 'xemacs)
-     (let ((ext-inv (extent-list
-                     nil (point-at-bol) (point-at-eol)
-                     'all-extents-closed-open 'invisible))
-           ext-inv-specs)
-       (dolist (ext ext-inv)
-         (when (extent-property ext 'invisible)
-           (add-to-list 'ext-inv-specs (list ext (extent-property
-						  ext 'invisible)))
-           (set-extent-property ext 'invisible nil)))
-       (indent-line-to column)
-       (dolist (ext-inv-spec ext-inv-specs)
-         (set-extent-property (car ext-inv-spec) 'invisible
-			      (cadr ext-inv-spec))))
-   (indent-line-to column)))
+  (if (featurep 'xemacs)
+      (org-xemacs-without-invisibility (indent-line-to column))
+    (indent-line-to column)))
 
 (defun org-move-to-column (column &optional force buffer)
- (if (featurep 'xemacs)
-     (let ((ext-inv (extent-list
-                     nil (point-at-bol) (point-at-eol)
-                     'all-extents-closed-open 'invisible))
-           ext-inv-specs)
-       (dolist (ext ext-inv)
-         (when (extent-property ext 'invisible)
-           (add-to-list 'ext-inv-specs (list ext (extent-property ext
-								  'invisible)))
-           (set-extent-property ext 'invisible nil)))
-       (move-to-column column force buffer)
-       (dolist (ext-inv-spec ext-inv-specs)
-         (set-extent-property (car ext-inv-spec) 'invisible
-			      (cadr ext-inv-spec))))
-   (move-to-column column force)))
- 
-(provide 'org-compat)
+  "Move to column COLUMN.
+Pass COLUMN and FORCE to `move-to-column'.
+Pass BUFFER to the XEmacs version of `move-to-column'."
+  (let* ((with-bracket-link
+	  (save-excursion
+	    (forward-line 0)
+	    (looking-at (concat "^.*" org-bracket-link-regexp))))
+	 (buffer-invisibility-spec
+	  (cond
+	   ((or (not (derived-mode-p 'org-mode))
+		(and with-bracket-link (org-invisible-p2)))
+	    (remove '(org-link) buffer-invisibility-spec))
+	   (with-bracket-link
+	    (remove t buffer-invisibility-spec))
+	   (t buffer-invisibility-spec))))
+    (if (featurep 'xemacs)
+	(org-xemacs-without-invisibility
+	 (move-to-column column force buffer))
+      (move-to-column column force))))
+
+(defun org-get-x-clipboard-compat (value)
+  "Get the clipboard value on XEmacs or Emacs 21."
+  (cond ((featurep 'xemacs)
+	 (org-no-warnings (get-selection-no-error value)))
+	((fboundp 'x-get-selection)
+	 (condition-case nil
+	     (or (x-get-selection value 'UTF8_STRING)
+		 (x-get-selection value 'COMPOUND_TEXT)
+		 (x-get-selection value 'STRING)
+		 (x-get-selection value 'TEXT))
+	   (error nil)))))
+
+(defun org-propertize (string &rest properties)
+  (if (featurep 'xemacs)
+      (progn
+	(add-text-properties 0 (length string) properties string)
+	string)
+    (apply 'propertize string properties)))
+
+(defmacro org-find-library-dir (library)
+  `(file-name-directory (or (locate-library ,library) "")))
+
+(defun org-count-lines (s)
+  "How many lines in string S?"
+  (let ((start 0) (n 1))
+    (while (string-match "\n" s start)
+      (setq start (match-end 0) n (1+ n)))
+    (if (and (> (length s) 0) (= (aref s (1- (length s))) ?\n))
+	(setq n (1- n)))
+    n))
+
+(defun org-kill-new (string &rest args)
+  (remove-text-properties 0 (length string) '(line-prefix t wrap-prefix t)
+			  string)
+  (apply 'kill-new string args))
+
+(defun org-select-frame-set-input-focus (frame)
+  "Select FRAME, raise it, and set input focus, if possible."
+  (cond ((featurep 'xemacs)
+	 (if (fboundp 'select-frame-set-input-focus)
+	     (select-frame-set-input-focus frame)
+	   (raise-frame frame)
+	   (select-frame frame)
+	   (focus-frame frame)))
+	;; `select-frame-set-input-focus' defined in Emacs 21 will not
+	;; set the input focus.
+	((>= emacs-major-version 22)
+	 (select-frame-set-input-focus frame))
+	(t
+	 (raise-frame frame)
+	 (select-frame frame)
+	 (cond ((memq window-system '(x ns mac))
+		(x-focus-frame frame))
+	       ((eq window-system 'w32)
+		(w32-focus-frame frame)))
+	 (when focus-follows-mouse
+	   (set-mouse-position frame (1- (frame-width frame)) 0)))))
+
+(defun org-float-time (&optional time)
+  "Convert time value TIME to a floating point number.
+TIME defaults to the current time."
+  (if (featurep 'xemacs)
+      (time-to-seconds (or time (current-time)))
+    (float-time time)))
+
+;; `user-error' is only available from 24.2.50 on
+(unless (fboundp 'user-error)
+  (defalias 'user-error 'error))
+
+(defmacro org-no-popups (&rest body)
+  "Suppress popup windows.
+Let-bind some variables to nil around BODY to achieve the desired
+effect, which variables to use depends on the Emacs version."
+  (if (org-version-check "24.2.50" "" :predicate)
+      `(let (pop-up-frames display-buffer-alist)
+	 ,@body)
+    `(let (pop-up-frames special-display-buffer-names special-display-regexps special-display-function)
+       ,@body)))
 
-;; arch-tag: a0a0579f-e68c-4bdf-9e55-93768b846bbe
+(if (fboundp 'string-match-p)
+    (defalias 'org-string-match-p 'string-match-p)
+  (defun org-string-match-p (regexp string &optional start)
+    (save-match-data
+      (funcall 'string-match regexp string start))))
+
+(if (fboundp 'looking-at-p)
+    (defalias 'org-looking-at-p 'looking-at-p)
+  (defun org-looking-at-p (&rest args)
+    (save-match-data
+      (apply 'looking-at args))))
+
+;; XEmacs does not have `looking-back'.
+(if (fboundp 'looking-back)
+    (defalias 'org-looking-back 'looking-back)
+  (defun org-looking-back (regexp &optional limit greedy)
+    "Return non-nil if text before point matches regular expression REGEXP.
+Like `looking-at' except matches before point, and is slower.
+LIMIT if non-nil speeds up the search by specifying a minimum
+starting position, to avoid checking matches that would start
+before LIMIT.
+
+If GREEDY is non-nil, extend the match backwards as far as
+possible, stopping when a single additional previous character
+cannot be part of a match for REGEXP.  When the match is
+extended, its starting position is allowed to occur before
+LIMIT."
+    (let ((start (point))
+	  (pos
+	   (save-excursion
+	     (and (re-search-backward (concat "\\(?:" regexp "\\)\\=") limit t)
+		  (point)))))
+      (if (and greedy pos)
+	  (save-restriction
+	    (narrow-to-region (point-min) start)
+	    (while (and (> pos (point-min))
+			(save-excursion
+			  (goto-char pos)
+			  (backward-char 1)
+			  (looking-at (concat "\\(?:"  regexp "\\)\\'"))))
+	      (setq pos (1- pos)))
+	    (save-excursion
+	      (goto-char pos)
+	      (looking-at (concat "\\(?:"  regexp "\\)\\'")))))
+      (not (null pos)))))
+
+(defalias 'org-font-lock-ensure
+  (if (fboundp 'org-font-lock-ensure)
+      #'font-lock-ensure
+    (lambda (_beg _end) (font-lock-fontify-buffer))))
+
+(defun org-floor* (x &optional y)
+  "Return a list of the floor of X and the fractional part of X.
+With two arguments, return floor and remainder of their quotient."
+  (let ((q (floor x y)))
+    (list q (- x (if y (* y q) q)))))
+
+;; `pop-to-buffer-same-window' has been introduced in Emacs 24.1.
+(defun org-pop-to-buffer-same-window
+  (&optional buffer-or-name norecord label)
+  "Pop to buffer specified by BUFFER-OR-NAME in the selected window."
+  (if (fboundp 'pop-to-buffer-same-window)
+      (funcall
+       'pop-to-buffer-same-window buffer-or-name norecord)
+    (funcall 'switch-to-buffer buffer-or-name norecord)))
+
+;; RECURSIVE has been introduced with Emacs 23.2.
+;; This is copying and adapted from `tramp-compat-delete-directory'
+(defun org-delete-directory (directory &optional recursive)
+  "Compatibility function for `delete-directory'."
+  (if (null recursive)
+      (delete-directory directory)
+    (condition-case nil
+	(funcall 'delete-directory directory recursive)
+      ;; This Emacs version does not support the RECURSIVE flag.  We
+      ;; use the implementation from Emacs 23.2.
+      (wrong-number-of-arguments
+       (setq directory (directory-file-name (expand-file-name directory)))
+       (if (not (file-symlink-p directory))
+	   (mapc (lambda (file)
+		   (if (eq t (car (file-attributes file)))
+		       (org-delete-directory file recursive)
+		     (delete-file file)))
+		 (directory-files
+		  directory 'full "^\\([^.]\\|\\.\\([^.]\\|\\..\\)\\).*")))
+       (delete-directory directory)))))
+
+;;;###autoload
+(defmacro org-check-version ()
+  "Try very hard to provide sensible version strings."
+  (let* ((org-dir        (org-find-library-dir "org"))
+	 (org-version.el (concat org-dir "org-version.el"))
+	 (org-fixup.el   (concat org-dir "../mk/org-fixup.el")))
+    (if (require 'org-version org-version.el 'noerror)
+	'(progn
+	   (autoload 'org-release     "org-version.el")
+	   (autoload 'org-git-version "org-version.el"))
+      (if (require 'org-fixup org-fixup.el 'noerror)
+	  '(org-fixup)
+	;; provide fallback definitions and complain
+	(warn "Could not define org version correctly.  Check installation!")
+	'(progn
+	   (defun org-release () "N/A")
+	   (defun org-git-version () "N/A !!check installation!!"))))))
+
+(defun org-file-equal-p (f1 f2)
+  "Return t if files F1 and F2 are the same.
+Implements `file-equal-p' for older emacsen and XEmacs."
+  (if (fboundp 'file-equal-p)
+      (file-equal-p f1 f2)
+    (let (f1-attr f2-attr)
+      (and (setq f1-attr (file-attributes (file-truename f1)))
+	   (setq f2-attr (file-attributes (file-truename f2)))
+	   (equal f1-attr f2-attr)))))
+
+;; `buffer-narrowed-p' is available for Emacs >=24.3
+(defun org-buffer-narrowed-p ()
+  "Compatibility function for `buffer-narrowed-p'."
+  (if (fboundp 'buffer-narrowed-p)
+      (buffer-narrowed-p)
+    (/= (- (point-max) (point-min)) (buffer-size))))
+
+(defmacro org-with-silent-modifications (&rest body)
+  (if (fboundp 'with-silent-modifications)
+      `(with-silent-modifications ,@body)
+    `(org-unmodified ,@body)))
+(def-edebug-spec org-with-silent-modifications (body))
+
+(provide 'org-compat)
 
 ;;; org-compat.el ends here