lisp/org/org-compat.el

   1 ;;; org-compat.el --- Compatibility code for Org-mode
   2
   3 ;; Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   4 ;;   Free Software Foundation, Inc.
   5
   6 ;; Author: Carsten Dominik <carsten at orgmode dot org>
   7 ;; Keywords: outlines, hypermedia, calendar, wp
   8 ;; Homepage: http://orgmode.org
   9 ;; Version: 7.4
  10 ;;
  11 ;; This file is part of GNU Emacs.
  12 ;;
  13 ;; GNU Emacs is free software: you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation, either version 3 of the License, or
  16 ;; (at your option) any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  25 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  26 ;;
  27 ;;; Commentary:
  28
  29 ;; This file contains code needed for compatibility with XEmacs and older
  30 ;; versions of GNU Emacs.
  31
  32 ;;; Code:
  33
  34 (eval-when-compile
  35   (require 'cl))
  36
  37 (require 'org-macs)
  38
  39 (declare-function find-library-name "find-func"  (library))
  40 (declare-function w32-focus-frame "term/w32-win" (frame))
  41
  42 ;; The following constant is for backward compatibility.  We do not use
  43 ;; it in org-mode, because the Byte compiler evaluates (featurep 'xemacs)
  44 ;; at compilation time and can therefore optimize code better.
  45 (defconst org-xemacs-p (featurep 'xemacs))
  46 (defconst org-format-transports-properties-p
  47   (let ((x "a"))
  48     (add-text-properties 0 1 '(test t) x)
  49     (get-text-property 0 'test (format "%s" x)))
  50   "Does format transport text properties?")
  51
  52 (defun org-compatible-face (inherits specs)
  53   "Make a compatible face specification.
  54 If INHERITS is an existing face and if the Emacs version supports it,
  55 just inherit the face.  If INHERITS is set and the Emacs version does
  56 not support it, copy the face specification from the inheritance face.
  57 If INHERITS is not given and SPECS is, use SPECS to define the face.
  58 XEmacs and Emacs 21 do not know about the `min-colors' attribute.
  59 For them we convert a (min-colors 8) entry to a `tty' entry and move it
  60 to the top of the list.  The `min-colors' attribute will be removed from
  61 any other entries, and any resulting duplicates will be removed entirely."
  62   (when (and inherits (facep inherits) (not specs))
  63     (setq specs (or specs
  64                     (get inherits 'saved-face)
  65                     (get inherits 'face-defface-spec))))
  66   (cond
  67    ((and inherits (facep inherits)
  68          (not (featurep 'xemacs))
  69          (>= emacs-major-version 22)
  70          ;; do not inherit outline faces before Emacs 23
  71          (or (>= emacs-major-version 23)
  72              (not (string-match "\\`outline-[0-9]+"
  73                                 (symbol-name inherits)))))
  74     (list (list t :inherit inherits)))
  75    ((or (featurep 'xemacs) (< emacs-major-version 22))
  76     ;; These do not understand the `min-colors' attribute.
  77     (let (r e a)
  78       (while (setq e (pop specs))
  79         (cond
  80          ((memq (car e) '(t default)) (push e r))
  81          ((setq a (member '(min-colors 8) (car e)))
  82           (nconc r (list (cons (cons '(type tty) (delq (car a) (car e)))
  83                                (cdr e)))))
  84          ((setq a (assq 'min-colors (car e)))
  85           (setq e (cons (delq a (car e)) (cdr e)))
  86           (or (assoc (car e) r) (push e r)))
  87          (t (or (assoc (car e) r) (push e r)))))
  88       (nreverse r)))
  89    (t specs)))
  90 (put 'org-compatible-face 'lisp-indent-function 1)
  91
  92 (defun org-version-check (version feature level)
  93   (let* ((v1 (mapcar 'string-to-number (split-string version "[.]")))
  94          (v2 (mapcar 'string-to-number (split-string emacs-version "[.]")))
  95          (rmaj (or (nth 0 v1) 99))
  96          (rmin (or (nth 1 v1) 99))
  97          (rbld (or (nth 2 v1) 99))
  98          (maj (or (nth 0 v2) 0))
  99          (min (or (nth 1 v2) 0))
 100          (bld (or (nth 2 v2) 0)))
 101     (if (or (< maj rmaj)
 102             (and (= maj rmaj)
 103                  (< min rmin))
 104             (and (= maj rmaj)
 105                  (= min rmin)
 106                  (< bld rbld)))
 107         (if (eq level :predicate)
 108             ;; just return if we have the version
 109             nil
 110           (let ((msg (format "Emacs %s or greater is recommended for %s"
 111                              version feature)))
 112             (display-warning 'org msg level)
 113             t))
 114       t)))
 115
 116 ;;;; Emacs/XEmacs compatibility
 117
 118 ;; Keys
 119 (defconst org-xemacs-key-equivalents
 120   '(([mouse-1] . [button1])
 121     ([mouse-2] . [button2])
 122     ([mouse-3] . [button3])
 123     ([C-mouse-4] . [(control mouse-4)])
 124     ([C-mouse-5] . [(control mouse-5)]))
 125   "Translation alist for a couple of keys.")
 126
 127 ;; Overlay compatibility functions
 128 (defun org-detach-overlay (ovl)
 129   (if (featurep 'xemacs) (detach-extent ovl) (delete-overlay ovl)))
 130 (defun org-overlay-display (ovl text &optional face evap)
 131   "Make overlay OVL display TEXT with face FACE."
 132   (if (featurep 'xemacs)
 133       (let ((gl (make-glyph text)))
 134         (and face (set-glyph-face gl face))
 135         (set-extent-property ovl 'invisible t)
 136         (set-extent-property ovl 'end-glyph gl))
 137     (overlay-put ovl 'display text)
 138     (if face (overlay-put ovl 'face face))
 139     (if evap (overlay-put ovl 'evaporate t))))
 140 (defun org-overlay-before-string (ovl text &optional face evap)
 141   "Make overlay OVL display TEXT with face FACE."
 142   (if (featurep 'xemacs)
 143       (let ((gl (make-glyph text)))
 144         (and face (set-glyph-face gl face))
 145         (set-extent-property ovl 'begin-glyph gl))
 146     (if face (org-add-props text nil 'face face))
 147     (overlay-put ovl 'before-string text)
 148     (if evap (overlay-put ovl 'evaporate t))))
 149 (defun org-find-overlays (prop &optional pos delete)
 150   "Find all overlays specifying PROP at POS or point.
 151 If DELETE is non-nil, delete all those overlays."
 152   (let ((overlays (overlays-at (or pos (point))))
 153         ov found)
 154     (while (setq ov (pop overlays))
 155       (if (overlay-get ov prop)
 156           (if delete (delete-overlay ov) (push ov found))))
 157     found))
 158
 159 (defun org-get-x-clipboard (value)
 160   "Get the value of the x clipboard, compatible with XEmacs, and GNU Emacs 21."
 161   (if (eq window-system 'x)
 162       (let ((x (org-get-x-clipboard-compat value)))
 163         (if x (org-no-properties x)))))
 164
 165 (defsubst org-decompose-region (beg end)
 166   "Decompose from BEG to END."
 167   (if (featurep 'xemacs)
 168       (let ((modified-p (buffer-modified-p))
 169             (buffer-read-only nil))
 170         (remove-text-properties beg end '(composition nil))
 171         (set-buffer-modified-p modified-p))
 172     (decompose-region beg end)))
 173
 174 ;; Miscellaneous functions
 175
 176 (defun org-add-hook (hook function &optional append local)
 177   "Add-hook, compatible with both Emacsen."
 178   (if (and local (featurep 'xemacs))
 179       (add-local-hook hook function append)
 180     (add-hook hook function append local)))
 181
 182 (defun org-add-props (string plist &rest props)
 183   "Add text properties to entire string, from beginning to end.
 184 PLIST may be a list of properties, PROPS are individual properties and values
 185 that will be added to PLIST.  Returns the string that was modified."
 186   (add-text-properties
 187    0 (length string) (if props (append plist props) plist) string)
 188   string)
 189 (put 'org-add-props 'lisp-indent-function 2)
 190
 191 (defun org-fit-window-to-buffer (&optional window max-height min-height
 192                                            shrink-only)
 193   "Fit WINDOW to the buffer, but only if it is not a side-by-side window.
 194 WINDOW defaults to the selected window.  MAX-HEIGHT and MIN-HEIGHT are
 195 passed through to `fit-window-to-buffer'.  If SHRINK-ONLY is set, call
 196 `shrink-window-if-larger-than-buffer' instead, the height limit is
 197 ignored in this case."
 198   (cond ((if (fboundp 'window-full-width-p)
 199              (not (window-full-width-p window))
 200            (> (frame-width) (window-width window)))
 201          ;; do nothing if another window would suffer
 202          )
 203         ((and (fboundp 'fit-window-to-buffer) (not shrink-only))
 204          (fit-window-to-buffer window max-height min-height))
 205         ((fboundp 'shrink-window-if-larger-than-buffer)
 206          (shrink-window-if-larger-than-buffer window)))
 207   (or window (selected-window)))
 208
 209 (defun org-number-sequence (from &optional to inc)
 210   "Call `number-sequence or emulate it."
 211   (if (fboundp 'number-sequence)
 212       (number-sequence from to inc)
 213     (if (or (not to) (= from to))
 214         (list from)
 215       (or inc (setq inc 1))
 216       (when (zerop inc) (error "The increment can not be zero"))
 217       (let (seq (n 0) (next from))
 218         (if (> inc 0)
 219             (while (<= next to)
 220               (setq seq (cons next seq)
 221                     n (1+ n)
 222                     next (+ from (* n inc))))
 223           (while (>= next to)
 224             (setq seq (cons next seq)
 225                   n (1+ n)
 226                   next (+ from (* n inc)))))
 227         (nreverse seq)))))
 228
 229 ;; Region compatibility
 230
 231 (defvar org-ignore-region nil
 232   "To temporarily disable the active region.")
 233
 234 (defun org-region-active-p ()
 235   "Is `transient-mark-mode' on and the region active?
 236 Works on both Emacs and XEmacs."
 237   (if org-ignore-region
 238       nil
 239     (if (featurep 'xemacs)
 240         (and zmacs-regions (region-active-p))
 241       (if (fboundp 'use-region-p)
 242           (use-region-p)
 243         (and transient-mark-mode mark-active))))) ; Emacs 22 and before
 244
 245 (defun org-cursor-to-region-beginning ()
 246   (when (and (org-region-active-p)
 247              (> (point) (region-beginning)))
 248     (exchange-point-and-mark)))
 249
 250 ;; Invisibility compatibility
 251
 252 (defun org-remove-from-invisibility-spec (arg)
 253   "Remove elements from `buffer-invisibility-spec'."
 254   (if (fboundp 'remove-from-invisibility-spec)
 255       (remove-from-invisibility-spec arg)
 256     (if (consp buffer-invisibility-spec)
 257         (setq buffer-invisibility-spec
 258               (delete arg buffer-invisibility-spec)))))
 259
 260 (defun org-in-invisibility-spec-p (arg)
 261   "Is ARG a member of `buffer-invisibility-spec'?"
 262   (if (consp buffer-invisibility-spec)
 263       (member arg buffer-invisibility-spec)
 264     nil))
 265
 266 (defmacro org-xemacs-without-invisibility (&rest body)
 267   "Turn off exents with invisibility while executing BODY."
 268   `(let ((ext-inv (extent-list nil (point-at-bol) (point-at-eol)
 269                                'all-extents-closed-open 'invisible))
 270          ext-inv-specs)
 271      (dolist (ext ext-inv)
 272        (when (extent-property ext 'invisible)
 273          (add-to-list 'ext-inv-specs (list ext (extent-property
 274                                                 ext 'invisible)))
 275          (set-extent-property ext 'invisible nil)))
 276      ,@body
 277      (dolist (ext-inv-spec ext-inv-specs)
 278        (set-extent-property (car ext-inv-spec) 'invisible
 279                             (cadr ext-inv-spec)))))
 280
 281 (defun org-indent-to-column (column &optional minimum buffer)
 282   "Work around a bug with extents with invisibility in XEmacs."
 283   (if (featurep 'xemacs)
 284       (org-xemacs-without-invisibility (indent-to-column column minimum buffer))
 285     (indent-to-column column minimum)))
 286
 287 (defun org-indent-line-to (column)
 288   "Work around a bug with extents with invisibility in XEmacs."
 289   (if (featurep 'xemacs)
 290       (org-xemacs-without-invisibility (indent-line-to column))
 291     (indent-line-to column)))
 292
 293 (defun org-move-to-column (column &optional force buffer)
 294   (if (featurep 'xemacs)
 295       (org-xemacs-without-invisibility (move-to-column column force buffer))
 296     (move-to-column column force)))
 297
 298 (defun org-get-x-clipboard-compat (value)
 299   "Get the clipboard value on XEmacs or Emacs 21."
 300   (cond ((featurep 'xemacs)
 301          (org-no-warnings (get-selection-no-error value)))
 302         ((fboundp 'x-get-selection)
 303          (condition-case nil
 304              (or (x-get-selection value 'UTF8_STRING)
 305                  (x-get-selection value 'COMPOUND_TEXT)
 306                  (x-get-selection value 'STRING)
 307                  (x-get-selection value 'TEXT))
 308            (error nil)))))
 309
 310 (defun org-propertize (string &rest properties)
 311   (if (featurep 'xemacs)
 312       (progn
 313         (add-text-properties 0 (length string) properties string)
 314         string)
 315     (apply 'propertize string properties)))
 316
 317 (defun org-substring-no-properties (string &optional from to)
 318   (if (featurep 'xemacs)
 319       (org-no-properties (substring string (or from 0) to))
 320     (substring-no-properties string from to)))
 321
 322 (defun org-find-library-name (library)
 323   (if (fboundp 'find-library-name)
 324       (file-name-directory (find-library-name library))
 325     ; XEmacs does not have `find-library-name'
 326     (flet ((find-library-name-helper (filename ignored-codesys)
 327                                      filename)
 328            (find-library-name (library)
 329             (find-library library nil 'find-library-name-helper)))
 330       (file-name-directory (find-library-name library)))))
 331
 332 (defun org-count-lines (s)
 333   "How many lines in string S?"
 334   (let ((start 0) (n 1))
 335     (while (string-match "\n" s start)
 336       (setq start (match-end 0) n (1+ n)))
 337     (if (and (> (length s) 0) (= (aref s (1- (length s))) ?\n))
 338         (setq n (1- n)))
 339     n))
 340
 341 (defun org-kill-new (string &rest args)
 342   (remove-text-properties 0 (length string) '(line-prefix t wrap-prefix t)
 343                           string)
 344   (apply 'kill-new string args))
 345
 346 (defun org-select-frame-set-input-focus (frame)
 347   "Select FRAME, raise it, and set input focus, if possible."
 348   (cond ((featurep 'xemacs)
 349          (if (fboundp 'select-frame-set-input-focus)
 350              (select-frame-set-input-focus frame)
 351            (raise-frame frame)
 352            (select-frame frame)
 353            (focus-frame frame)))
 354         ;; `select-frame-set-input-focus' defined in Emacs 21 will not
 355         ;; set the input focus.
 356         ((>= emacs-major-version 22)
 357          (select-frame-set-input-focus frame))
 358         (t
 359          (raise-frame frame)
 360          (select-frame frame)
 361          (cond ((memq window-system '(x ns mac))
 362                 (x-focus-frame frame))
 363                ((eq window-system 'w32)
 364                 (w32-focus-frame frame)))
 365          (when focus-follows-mouse
 366            (set-mouse-position frame (1- (frame-width frame)) 0)))))
 367
 368 (defun org-float-time (&optional time)
 369   "Convert time value TIME to a floating point number.
 370 TIME defaults to the current time."
 371   (if (featurep 'xemacs)
 372       (time-to-seconds (or time (current-time)))
 373     (float-time time)))
 374
 375 (if (fboundp 'string-match-p)
 376     (defalias 'org-string-match-p 'string-match-p)
 377   (defun org-string-match-p (regexp string &optional start)
 378     (save-match-data
 379       (funcall 'string-match regexp string start))))
 380
 381 (if (fboundp 'looking-at-p)
 382     (defalias 'org-looking-at-p 'looking-at-p)
 383   (defun org-looking-at-p (&rest args)
 384     (save-match-data
 385       (apply 'looking-at args))))
 386
 387 ; XEmacs does not have `looking-back'.
 388 (if (fboundp 'looking-back)
 389     (defalias 'org-looking-back 'looking-back)
 390   (defun org-looking-back (regexp &optional limit greedy)
 391     "Return non-nil if text before point matches regular expression REGEXP.
 392 Like `looking-at' except matches before point, and is slower.
 393 LIMIT if non-nil speeds up the search by specifying a minimum
 394 starting position, to avoid checking matches that would start
 395 before LIMIT.
 396
 397 If GREEDY is non-nil, extend the match backwards as far as
 398 possible, stopping when a single additional previous character
 399 cannot be part of a match for REGEXP.  When the match is
 400 extended, its starting position is allowed to occur before
 401 LIMIT."
 402     (let ((start (point))
 403           (pos
 404            (save-excursion
 405              (and (re-search-backward (concat "\\(?:" regexp "\\)\\=") limit t)
 406                   (point)))))
 407       (if (and greedy pos)
 408           (save-restriction
 409             (narrow-to-region (point-min) start)
 410             (while (and (> pos (point-min))
 411                         (save-excursion
 412                           (goto-char pos)
 413                           (backward-char 1)
 414                           (looking-at (concat "\\(?:"  regexp "\\)\\'"))))
 415               (setq pos (1- pos)))
 416             (save-excursion
 417               (goto-char pos)
 418               (looking-at (concat "\\(?:"  regexp "\\)\\'")))))
 419       (not (null pos)))))
 420
 421 (defun org-floor* (x &optional y)
 422   "Return a list of the floor of X and the fractional part of X.
 423 With two arguments, return floor and remainder of their quotient."
 424   (let ((q (floor x y)))
 425     (list q (- x (if y (* y q) q)))))
 426
 427 (provide 'org-compat)
 428
 429
 430 ;;; org-compat.el ends here