lisp/org-compat.el

   1 ;;; org-compat.el --- Compatibility code for Org-mode
   2
   3 ;; Copyright (C) 2004-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Carsten Dominik <carsten at orgmode dot org>
   6 ;; Keywords: outlines, hypermedia, calendar, wp
   7 ;; Homepage: http://orgmode.org
   8 ;;
   9 ;; This file is part of GNU Emacs.
  10 ;;
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  24 ;;
  25 ;;; Commentary:
  26
  27 ;; This file contains code needed for compatibility with XEmacs and older
  28 ;; versions of GNU Emacs.
  29
  30 ;;; Code:
  31
  32 (eval-when-compile
  33   (require 'cl))
  34
  35 (require 'org-macs)
  36
  37 (declare-function w32-focus-frame "term/w32-win" (frame))
  38
  39 ;; The following constant is for backward compatibility.  We do not use
  40 ;; it in org-mode, because the Byte compiler evaluates (featurep 'xemacs)
  41 ;; at compilation time and can therefore optimize code better.
  42 (defconst org-xemacs-p (featurep 'xemacs))
  43 (defconst org-format-transports-properties-p
  44   (let ((x "a"))
  45     (add-text-properties 0 1 '(test t) x)
  46     (get-text-property 0 'test (format "%s" x)))
  47   "Does format transport text properties?")
  48
  49 (defun org-compatible-face (inherits specs)
  50   "Make a compatible face specification.
  51 If INHERITS is an existing face and if the Emacs version supports it,
  52 just inherit the face.  If INHERITS is set and the Emacs version does
  53 not support it, copy the face specification from the inheritance face.
  54 If INHERITS is not given and SPECS is, use SPECS to define the face.
  55 XEmacs and Emacs 21 do not know about the `min-colors' attribute.
  56 For them we convert a (min-colors 8) entry to a `tty' entry and move it
  57 to the top of the list.  The `min-colors' attribute will be removed from
  58 any other entries, and any resulting duplicates will be removed entirely."
  59   (when (and inherits (facep inherits) (not specs))
  60     (setq specs (or specs
  61                     (get inherits 'saved-face)
  62                     (get inherits 'face-defface-spec))))
  63   (cond
  64    ((and inherits (facep inherits)
  65          (not (featurep 'xemacs))
  66          (>= emacs-major-version 22)
  67          ;; do not inherit outline faces before Emacs 23
  68          (or (>= emacs-major-version 23)
  69              (not (string-match "\\`outline-[0-9]+"
  70                                 (symbol-name inherits)))))
  71     (list (list t :inherit inherits)))
  72    ((or (featurep 'xemacs) (< emacs-major-version 22))
  73     ;; These do not understand the `min-colors' attribute.
  74     (let (r e a)
  75       (while (setq e (pop specs))
  76         (cond
  77          ((memq (car e) '(t default)) (push e r))
  78          ((setq a (member '(min-colors 8) (car e)))
  79           (nconc r (list (cons (cons '(type tty) (delq (car a) (car e)))
  80                                (cdr e)))))
  81          ((setq a (assq 'min-colors (car e)))
  82           (setq e (cons (delq a (car e)) (cdr e)))
  83           (or (assoc (car e) r) (push e r)))
  84          (t (or (assoc (car e) r) (push e r)))))
  85       (nreverse r)))
  86    (t specs)))
  87 (put 'org-compatible-face 'lisp-indent-function 1)
  88
  89 (defun org-version-check (version feature level)
  90   (let* ((v1 (mapcar 'string-to-number (split-string version "[.]")))
  91          (v2 (mapcar 'string-to-number (split-string emacs-version "[.]")))
  92          (rmaj (or (nth 0 v1) 99))
  93          (rmin (or (nth 1 v1) 99))
  94          (rbld (or (nth 2 v1) 99))
  95          (maj (or (nth 0 v2) 0))
  96          (min (or (nth 1 v2) 0))
  97          (bld (or (nth 2 v2) 0)))
  98     (if (or (< maj rmaj)
  99             (and (= maj rmaj)
 100                  (< min rmin))
 101             (and (= maj rmaj)
 102                  (= min rmin)
 103                  (< bld rbld)))
 104         (if (eq level :predicate)
 105             ;; just return if we have the version
 106             nil
 107           (let ((msg (format "Emacs %s or greater is recommended for %s"
 108                              version feature)))
 109             (display-warning 'org msg level)
 110             t))
 111       t)))
 112
 113 \f
 114 ;;;; Emacs/XEmacs compatibility
 115
 116 (eval-and-compile
 117   (defun org-defvaralias (new-alias base-variable &optional docstring)
 118     "Compatibility function for defvaralias.
 119 Don't do the aliasing when `defvaralias' is not bound."
 120     (declare (indent 1))
 121     (when (fboundp 'defvaralias)
 122       (defvaralias new-alias base-variable docstring)))
 123
 124   (when (and (not (boundp 'user-emacs-directory))
 125              (boundp 'user-init-directory))
 126     (org-defvaralias 'user-emacs-directory 'user-init-directory)))
 127
 128 (when (featurep 'xemacs)
 129   (defadvice custom-handle-keyword
 130     (around org-custom-handle-keyword
 131             activate preactivate)
 132     "Remove custom keywords not recognized to avoid producing an error."
 133     (cond
 134      ((eq (ad-get-arg 1) :package-version))
 135      (t ad-do-it)))
 136   (defadvice define-obsolete-variable-alias
 137     (around org-define-obsolete-variable-alias
 138             (obsolete-name current-name &optional when docstring)
 139             activate preactivate)
 140     "Declare arguments defined in later versions of Emacs."
 141     ad-do-it)
 142   (defadvice define-obsolete-function-alias
 143     (around org-define-obsolete-function-alias
 144             (obsolete-name current-name &optional when docstring)
 145             activate preactivate)
 146     "Declare arguments defined in later versions of Emacs."
 147     ad-do-it)
 148   (defvar customize-package-emacs-version-alist nil)
 149   (defvar temporary-file-directory (temp-directory)))
 150
 151 ;; Keys
 152 (defconst org-xemacs-key-equivalents
 153   '(([mouse-1] . [button1])
 154     ([mouse-2] . [button2])
 155     ([mouse-3] . [button3])
 156     ([C-mouse-4] . [(control mouse-4)])
 157     ([C-mouse-5] . [(control mouse-5)]))
 158   "Translation alist for a couple of keys.")
 159
 160 ;; Overlay compatibility functions
 161 (defun org-detach-overlay (ovl)
 162   (if (featurep 'xemacs) (detach-extent ovl) (delete-overlay ovl)))
 163 (defun org-overlay-display (ovl text &optional face evap)
 164   "Make overlay OVL display TEXT with face FACE."
 165   (if (featurep 'xemacs)
 166       (let ((gl (make-glyph text)))
 167         (and face (set-glyph-face gl face))
 168         (set-extent-property ovl 'invisible t)
 169         (set-extent-property ovl 'end-glyph gl))
 170     (overlay-put ovl 'display text)
 171     (if face (overlay-put ovl 'face face))
 172     (if evap (overlay-put ovl 'evaporate t))))
 173 (defun org-overlay-before-string (ovl text &optional face evap)
 174   "Make overlay OVL display TEXT with face FACE."
 175   (if (featurep 'xemacs)
 176       (let ((gl (make-glyph text)))
 177         (and face (set-glyph-face gl face))
 178         (set-extent-property ovl 'begin-glyph gl))
 179     (if face (org-add-props text nil 'face face))
 180     (overlay-put ovl 'before-string text)
 181     (if evap (overlay-put ovl 'evaporate t))))
 182 (defun org-find-overlays (prop &optional pos delete)
 183   "Find all overlays specifying PROP at POS or point.
 184 If DELETE is non-nil, delete all those overlays."
 185   (let ((overlays (overlays-at (or pos (point))))
 186         ov found)
 187     (while (setq ov (pop overlays))
 188       (if (overlay-get ov prop)
 189           (if delete (delete-overlay ov) (push ov found))))
 190     found))
 191
 192 (defun org-get-x-clipboard (value)
 193   "Get the value of the x clipboard, compatible with XEmacs, and GNU Emacs 21."
 194   (if (eq window-system 'x)
 195       (let ((x (org-get-x-clipboard-compat value)))
 196         (if x (org-no-properties x)))))
 197
 198 (defsubst org-decompose-region (beg end)
 199   "Decompose from BEG to END."
 200   (if (featurep 'xemacs)
 201       (let ((modified-p (buffer-modified-p))
 202             (buffer-read-only nil))
 203         (remove-text-properties beg end '(composition nil))
 204         (set-buffer-modified-p modified-p))
 205     (decompose-region beg end)))
 206
 207 ;; Miscellaneous functions
 208
 209 (defun org-add-hook (hook function &optional append local)
 210   "Add-hook, compatible with both Emacsen."
 211   (if (and local (featurep 'xemacs))
 212       (add-local-hook hook function append)
 213     (add-hook hook function append local)))
 214
 215 (defun org-add-props (string plist &rest props)
 216   "Add text properties to entire string, from beginning to end.
 217 PLIST may be a list of properties, PROPS are individual properties and values
 218 that will be added to PLIST.  Returns the string that was modified."
 219   (add-text-properties
 220    0 (length string) (if props (append plist props) plist) string)
 221   string)
 222 (put 'org-add-props 'lisp-indent-function 2)
 223
 224 (defun org-fit-window-to-buffer (&optional window max-height min-height
 225                                            shrink-only)
 226   "Fit WINDOW to the buffer, but only if it is not a side-by-side window.
 227 WINDOW defaults to the selected window.  MAX-HEIGHT and MIN-HEIGHT are
 228 passed through to `fit-window-to-buffer'.  If SHRINK-ONLY is set, call
 229 `shrink-window-if-larger-than-buffer' instead, the height limit is
 230 ignored in this case."
 231   (cond ((if (fboundp 'window-full-width-p)
 232              (not (window-full-width-p window))
 233            ;; do nothing if another window would suffer
 234            (> (frame-width) (window-width window))))
 235         ((and (fboundp 'fit-window-to-buffer) (not shrink-only))
 236          (fit-window-to-buffer window max-height min-height))
 237         ((fboundp 'shrink-window-if-larger-than-buffer)
 238          (shrink-window-if-larger-than-buffer window)))
 239   (or window (selected-window)))
 240
 241 (defun org-number-sequence (from &optional to inc)
 242   "Call `number-sequence or emulate it."
 243   (if (fboundp 'number-sequence)
 244       (number-sequence from to inc)
 245     (if (or (not to) (= from to))
 246         (list from)
 247       (or inc (setq inc 1))
 248       (when (zerop inc) (error "The increment can not be zero"))
 249       (let (seq (n 0) (next from))
 250         (if (> inc 0)
 251             (while (<= next to)
 252               (setq seq (cons next seq)
 253                     n (1+ n)
 254                     next (+ from (* n inc))))
 255           (while (>= next to)
 256             (setq seq (cons next seq)
 257                   n (1+ n)
 258                   next (+ from (* n inc)))))
 259         (nreverse seq)))))
 260
 261 ;; Region compatibility
 262
 263 (defvar org-ignore-region nil
 264   "Non-nil means temporarily disable the active region.")
 265
 266 (defun org-region-active-p ()
 267   "Is `transient-mark-mode' on and the region active?
 268 Works on both Emacs and XEmacs."
 269   (if org-ignore-region
 270       nil
 271     (if (featurep 'xemacs)
 272         (and zmacs-regions (region-active-p))
 273       (if (fboundp 'use-region-p)
 274           (use-region-p)
 275         (and transient-mark-mode mark-active))))) ; Emacs 22 and before
 276
 277 (defun org-cursor-to-region-beginning ()
 278   (when (and (org-region-active-p)
 279              (> (point) (region-beginning)))
 280     (exchange-point-and-mark)))
 281
 282 ;; Emacs 22 misses `activate-mark'
 283 (if (fboundp 'activate-mark)
 284     (defalias 'org-activate-mark 'activate-mark)
 285   (defun org-activate-mark ()
 286     (when (mark t)
 287       (setq mark-active t)
 288       (when (and (boundp 'transient-mark-mode)
 289                  (not transient-mark-mode))
 290         (setq transient-mark-mode 'lambda))
 291       (when (boundp 'zmacs-regions)
 292         (setq zmacs-regions t)))))
 293
 294 ;; Invisibility compatibility
 295
 296 (defun org-remove-from-invisibility-spec (arg)
 297   "Remove elements from `buffer-invisibility-spec'."
 298   (if (fboundp 'remove-from-invisibility-spec)
 299       (remove-from-invisibility-spec arg)
 300     (if (consp buffer-invisibility-spec)
 301         (setq buffer-invisibility-spec
 302               (delete arg buffer-invisibility-spec)))))
 303
 304 (defun org-in-invisibility-spec-p (arg)
 305   "Is ARG a member of `buffer-invisibility-spec'?"
 306   (if (consp buffer-invisibility-spec)
 307       (member arg buffer-invisibility-spec)
 308     nil))
 309
 310 (defmacro org-xemacs-without-invisibility (&rest body)
 311   "Turn off extents with invisibility while executing BODY."
 312   `(let ((ext-inv (extent-list nil (point-at-bol) (point-at-eol)
 313                                'all-extents-closed-open 'invisible))
 314          ext-inv-specs)
 315      (dolist (ext ext-inv)
 316        (when (extent-property ext 'invisible)
 317          (add-to-list 'ext-inv-specs (list ext (extent-property
 318                                                 ext 'invisible)))
 319          (set-extent-property ext 'invisible nil)))
 320      ,@body
 321      (dolist (ext-inv-spec ext-inv-specs)
 322        (set-extent-property (car ext-inv-spec) 'invisible
 323                             (cadr ext-inv-spec)))))
 324 (def-edebug-spec org-xemacs-without-invisibility (body))
 325
 326 (defun org-indent-to-column (column &optional minimum buffer)
 327   "Work around a bug with extents with invisibility in XEmacs."
 328   (if (featurep 'xemacs)
 329       (org-xemacs-without-invisibility (indent-to-column column minimum buffer))
 330     (indent-to-column column minimum)))
 331
 332 (defun org-indent-line-to (column)
 333   "Work around a bug with extents with invisibility in XEmacs."
 334   (if (featurep 'xemacs)
 335       (org-xemacs-without-invisibility (indent-line-to column))
 336     (indent-line-to column)))
 337
 338 (defun org-move-to-column (column &optional force buffer)
 339   (if (featurep 'xemacs)
 340       (org-xemacs-without-invisibility (move-to-column column force buffer))
 341     (move-to-column column force)))
 342
 343 (defun org-get-x-clipboard-compat (value)
 344   "Get the clipboard value on XEmacs or Emacs 21."
 345   (cond ((featurep 'xemacs)
 346          (org-no-warnings (get-selection-no-error value)))
 347         ((fboundp 'x-get-selection)
 348          (condition-case nil
 349              (or (x-get-selection value 'UTF8_STRING)
 350                  (x-get-selection value 'COMPOUND_TEXT)
 351                  (x-get-selection value 'STRING)
 352                  (x-get-selection value 'TEXT))
 353            (error nil)))))
 354
 355 (defun org-propertize (string &rest properties)
 356   (if (featurep 'xemacs)
 357       (progn
 358         (add-text-properties 0 (length string) properties string)
 359         string)
 360     (apply 'propertize string properties)))
 361
 362 (defmacro org-find-library-dir (library)
 363   `(file-name-directory (or (locate-library ,library) "")))
 364
 365 (defun org-count-lines (s)
 366   "How many lines in string S?"
 367   (let ((start 0) (n 1))
 368     (while (string-match "\n" s start)
 369       (setq start (match-end 0) n (1+ n)))
 370     (if (and (> (length s) 0) (= (aref s (1- (length s))) ?\n))
 371         (setq n (1- n)))
 372     n))
 373
 374 (defun org-kill-new (string &rest args)
 375   (remove-text-properties 0 (length string) '(line-prefix t wrap-prefix t)
 376                           string)
 377   (apply 'kill-new string args))
 378
 379 (defun org-select-frame-set-input-focus (frame)
 380   "Select FRAME, raise it, and set input focus, if possible."
 381   (cond ((featurep 'xemacs)
 382          (if (fboundp 'select-frame-set-input-focus)
 383              (select-frame-set-input-focus frame)
 384            (raise-frame frame)
 385            (select-frame frame)
 386            (focus-frame frame)))
 387         ;; `select-frame-set-input-focus' defined in Emacs 21 will not
 388         ;; set the input focus.
 389         ((>= emacs-major-version 22)
 390          (select-frame-set-input-focus frame))
 391         (t
 392          (raise-frame frame)
 393          (select-frame frame)
 394          (cond ((memq window-system '(x ns mac))
 395                 (x-focus-frame frame))
 396                ((eq window-system 'w32)
 397                 (w32-focus-frame frame)))
 398          (when focus-follows-mouse
 399            (set-mouse-position frame (1- (frame-width frame)) 0)))))
 400
 401 (defun org-float-time (&optional time)
 402   "Convert time value TIME to a floating point number.
 403 TIME defaults to the current time."
 404   (if (featurep 'xemacs)
 405       (time-to-seconds (or time (current-time)))
 406     (float-time time)))
 407
 408 ;; `user-error' is only available from 24.2.50 on
 409 (unless (fboundp 'user-error)
 410   (defalias 'user-error 'error))
 411
 412 (defmacro org-no-popups (&rest body)
 413   "Suppress popup windows.
 414 Let-bind some variables to nil around BODY to achieve the desired
 415 effect, which variables to use depends on the Emacs version."
 416   (if (org-version-check "24.2.50" "" :predicate)
 417       `(let (pop-up-frames display-buffer-alist)
 418          ,@body)
 419     `(let (pop-up-frames special-display-buffer-names special-display-regexps special-display-function)
 420        ,@body)))
 421
 422 (if (fboundp 'string-match-p)
 423     (defalias 'org-string-match-p 'string-match-p)
 424   (defun org-string-match-p (regexp string &optional start)
 425     (save-match-data
 426       (funcall 'string-match regexp string start))))
 427
 428 (if (fboundp 'looking-at-p)
 429     (defalias 'org-looking-at-p 'looking-at-p)
 430   (defun org-looking-at-p (&rest args)
 431     (save-match-data
 432       (apply 'looking-at args))))
 433
 434 ;; XEmacs does not have `looking-back'.
 435 (if (fboundp 'looking-back)
 436     (defalias 'org-looking-back 'looking-back)
 437   (defun org-looking-back (regexp &optional limit greedy)
 438     "Return non-nil if text before point matches regular expression REGEXP.
 439 Like `looking-at' except matches before point, and is slower.
 440 LIMIT if non-nil speeds up the search by specifying a minimum
 441 starting position, to avoid checking matches that would start
 442 before LIMIT.
 443
 444 If GREEDY is non-nil, extend the match backwards as far as
 445 possible, stopping when a single additional previous character
 446 cannot be part of a match for REGEXP.  When the match is
 447 extended, its starting position is allowed to occur before
 448 LIMIT."
 449     (let ((start (point))
 450           (pos
 451            (save-excursion
 452              (and (re-search-backward (concat "\\(?:" regexp "\\)\\=") limit t)
 453                   (point)))))
 454       (if (and greedy pos)
 455           (save-restriction
 456             (narrow-to-region (point-min) start)
 457             (while (and (> pos (point-min))
 458                         (save-excursion
 459                           (goto-char pos)
 460                           (backward-char 1)
 461                           (looking-at (concat "\\(?:"  regexp "\\)\\'"))))
 462               (setq pos (1- pos)))
 463             (save-excursion
 464               (goto-char pos)
 465               (looking-at (concat "\\(?:"  regexp "\\)\\'")))))
 466       (not (null pos)))))
 467
 468 (defun org-floor* (x &optional y)
 469   "Return a list of the floor of X and the fractional part of X.
 470 With two arguments, return floor and remainder of their quotient."
 471   (let ((q (floor x y)))
 472     (list q (- x (if y (* y q) q)))))
 473
 474 ;; `pop-to-buffer-same-window' has been introduced in Emacs 24.1.
 475 (defun org-pop-to-buffer-same-window
 476   (&optional buffer-or-name norecord label)
 477   "Pop to buffer specified by BUFFER-OR-NAME in the selected window."
 478   (if (fboundp 'pop-to-buffer-same-window)
 479       (funcall
 480        'pop-to-buffer-same-window buffer-or-name norecord)
 481     (funcall 'switch-to-buffer buffer-or-name norecord)))
 482
 483 ;; RECURSIVE has been introduced with Emacs 23.2.
 484 ;; This is copying and adapted from `tramp-compat-delete-directory'
 485 (defun org-delete-directory (directory &optional recursive)
 486   "Compatibility function for `delete-directory'."
 487   (if (null recursive)
 488       (delete-directory directory)
 489     (condition-case nil
 490         (funcall 'delete-directory directory recursive)
 491       ;; This Emacs version does not support the RECURSIVE flag.  We
 492       ;; use the implementation from Emacs 23.2.
 493       (wrong-number-of-arguments
 494        (setq directory (directory-file-name (expand-file-name directory)))
 495        (if (not (file-symlink-p directory))
 496            (mapc (lambda (file)
 497                    (if (eq t (car (file-attributes file)))
 498                        (org-delete-directory file recursive)
 499                      (delete-file file)))
 500                  (directory-files
 501                   directory 'full "^\\([^.]\\|\\.\\([^.]\\|\\..\\)\\).*")))
 502        (delete-directory directory)))))
 503
 504 ;;;###autoload
 505 (defmacro org-check-version ()
 506   "Try very hard to provide sensible version strings."
 507   (let* ((org-dir        (org-find-library-dir "org"))
 508          (org-version.el (concat org-dir "org-version.el"))
 509          (org-fixup.el   (concat org-dir "../mk/org-fixup.el")))
 510     (if (require 'org-version org-version.el 'noerror)
 511         '(progn
 512            (autoload 'org-release     "org-version.el")
 513            (autoload 'org-git-version "org-version.el"))
 514       (if (require 'org-fixup org-fixup.el 'noerror)
 515           '(org-fixup)
 516         ;; provide fallback definitions and complain
 517         (warn "Could not define org version correctly.  Check installation!")
 518         '(progn
 519            (defun org-release () "N/A")
 520            (defun org-git-version () "N/A !!check installation!!"))))))
 521
 522 (defun org-file-equal-p (f1 f2)
 523   "Return t if files F1 and F2 are the same.
 524 Implements `file-equal-p' for older emacsen and XEmacs."
 525   (if (fboundp 'file-equal-p)
 526       (file-equal-p f1 f2)
 527     (let (f1-attr f2-attr)
 528       (and (setq f1-attr (file-attributes (file-truename f1)))
 529            (setq f2-attr (file-attributes (file-truename f2)))
 530            (equal f1-attr f2-attr)))))
 531
 532 ;; `buffer-narrowed-p' is available for Emacs >=24.3
 533 (defun org-buffer-narrowed-p ()
 534   "Compatibility function for `buffer-narrowed-p'."
 535   (if (fboundp 'buffer-narrowed-p)
 536       (buffer-narrowed-p)
 537     (/= (- (point-max) (point-min)) (buffer-size))))
 538
 539 (defmacro org-with-silent-modifications (&rest body)
 540   (if (fboundp 'with-silent-modifications)
 541       `(with-silent-modifications ,@body)
 542     `(org-unmodified ,@body)))
 543 (def-edebug-spec org-with-silent-modifications (body))
 544
 545 (provide 'org-compat)
 546
 547 ;;; org-compat.el ends here