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+;;; org-compat.el --- Compatibility code for Org-mode
+
+;; Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
+;;   Free Software Foundation, Inc.
+
+;; Author: Carsten Dominik <carsten at orgmode dot org>
+;; Keywords: outlines, hypermedia, calendar, wp
+;; Homepage: http://orgmode.org
+;; Version: 7.4
+;;
+;; 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:
+
+;; This file contains code needed for compatibility with XEmacs and older
+;; versions of GNU Emacs.
+
+;;; Code:
+
+(eval-when-compile
+  (require 'cl))
+
+(require 'org-macs)
+
+(declare-function find-library-name "find-func"  (library))
+(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)
+    (get-text-property 0 'test (format "%s" x)))
+  "Does format transport text properties?")
+
+(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 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)
+	 ;; 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.
+    (let (r e a)
+      (while (setq e (pop specs))
+	(cond
+	 ((memq (car e) '(t default)) (push e r))
+	 ((setq a (member '(min-colors 8) (car e)))
+	  (nconc r (list (cons (cons '(type tty) (delq (car a) (car e)))
+			       (cdr e)))))
+	 ((setq a (assq 'min-colors (car e)))
+	  (setq e (cons (delq a (car e)) (cdr e)))
+	  (or (assoc (car e) r) (push e r)))
+	 (t (or (assoc (car e) r) (push e r)))))
+      (nreverse r)))
+   (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
+
+;; 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-detach-overlay (ovl)
+  (if (featurep 'xemacs) (detach-extent ovl) (delete-overlay ovl)))
+(defun org-overlay-display (ovl text &optional face evap)
+  "Make overlay OVL display TEXT with face FACE."
+  (if (featurep 'xemacs)
+      (let ((gl (make-glyph text)))
+	(and face (set-glyph-face gl face))
+	(set-extent-property ovl 'invisible t)
+	(set-extent-property ovl 'end-glyph gl))
+    (overlay-put ovl 'display text)
+    (if face (overlay-put ovl 'face face))
+    (if evap (overlay-put ovl 'evaporate t))))
+(defun org-overlay-before-string (ovl text &optional face evap)
+  "Make overlay OVL display TEXT with face FACE."
+  (if (featurep 'xemacs)
+      (let ((gl (make-glyph text)))
+	(and face (set-glyph-face gl face))
+	(set-extent-property ovl 'begin-glyph gl))
+    (if face (org-add-props text nil 'face face))
+    (overlay-put ovl 'before-string text)
+    (if evap (overlay-put ovl 'evaporate t))))
+(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 (overlays-at (or pos (point))))
+	ov found)
+    (while (setq ov (pop overlays))
+      (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 clipboard, compatible with XEmacs, and GNU Emacs 21."
+  (if (eq window-system 'x)
+      (let ((x (org-get-x-clipboard-compat value)))
+	(if x (org-no-properties x)))))
+
+(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))
+      (add-local-hook hook function append)
+    (add-hook hook function append local)))
+
+(defun org-add-props (string plist &rest props)
+  "Add text properties to entire string, from beginning to end.
+PLIST may be a list of properties, PROPS are individual properties and values
+that will be added to PLIST.  Returns the string that was modified."
+  (add-text-properties
+   0 (length string) (if props (append plist props) plist) string)
+  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))
+	   (> (frame-width) (window-width window)))
+	 ;; do nothing if another window would suffer
+	 )
+	((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)))))
+
+;; Region compatibility
+
+(defvar org-ignore-region nil
+  "To temporarily disable the active region.")
+
+(defun org-region-active-p ()
+  "Is `transient-mark-mode' on and the region active?
+Works on both Emacs and XEmacs."
+  (if org-ignore-region
+      nil
+    (if (featurep 'xemacs)
+	(and zmacs-regions (region-active-p))
+      (if (fboundp 'use-region-p)
+	  (use-region-p)
+	(and transient-mark-mode mark-active))))) ; Emacs 22 and before
+
+(defun org-cursor-to-region-beginning ()
+  (when (and (org-region-active-p)
+	     (> (point) (region-beginning)))
+    (exchange-point-and-mark)))
+
+;; Invisibility compatibility
+
+(defun org-remove-from-invisibility-spec (arg)
+  "Remove elements from `buffer-invisibility-spec'."
+  (if (fboundp 'remove-from-invisibility-spec)
+      (remove-from-invisibility-spec arg)
+    (if (consp buffer-invisibility-spec)
+	(setq buffer-invisibility-spec
+	      (delete arg buffer-invisibility-spec)))))
+
+(defun org-in-invisibility-spec-p (arg)
+  "Is ARG a member of `buffer-invisibility-spec'?"
+  (if (consp buffer-invisibility-spec)
+      (member arg buffer-invisibility-spec)
+    nil))
+
+(defmacro org-xemacs-without-invisibility (&rest body)
+  "Turn off exents 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)))))
+
+(defun org-indent-to-column (column &optional minimum buffer)
+  "Work around a bug with extents with invisibility in XEmacs."
+  (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)
+      (org-xemacs-without-invisibility (indent-line-to column))
+    (indent-line-to column)))
+
+(defun org-move-to-column (column &optional force buffer)
+  (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)))
+
+(defun org-substring-no-properties (string &optional from to)
+  (if (featurep 'xemacs)
+      (org-no-properties (substring string (or from 0) to))
+    (substring-no-properties string from to)))
+
+(defun org-find-library-name (library)
+  (if (fboundp 'find-library-name)
+      (file-name-directory (find-library-name library))
+    ; XEmacs does not have `find-library-name'
+    (flet ((find-library-name-helper (filename ignored-codesys)
+				     filename)
+	   (find-library-name (library)
+	    (find-library library nil 'find-library-name-helper)))
+      (file-name-directory (find-library-name 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)))
+
+(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)))))
+
+(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)))))
+
+(provide 'org-compat)
+
+;; arch-tag: a0a0579f-e68c-4bdf-9e55-93768b846bbe
+
+;;; org-compat.el ends here