lisp/org-compat.el

   1 ;;; org-compat.el --- Compatibility code for Org-mode
   2
   3 ;; Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009
   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: 6.21a
  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 (require 'org-macs)
  35
  36 (defconst org-xemacs-p (featurep 'xemacs)) ; not used by org.el itself
  37 (defconst org-format-transports-properties-p
  38   (let ((x "a"))
  39     (add-text-properties 0 1 '(test t) x)
  40     (get-text-property 0 'test (format "%s" x)))
  41   "Does format transport text properties?")
  42
  43 (defun org-compatible-face (inherits specs)
  44   "Make a compatible face specification.
  45 If INHERITS is an existing face and if the Emacs version supports it,
  46 just inherit the face.  If not, use SPECS to define the face.
  47 XEmacs and Emacs 21 do not know about the `min-colors' attribute.
  48 For them we convert a (min-colors 8) entry to a `tty' entry and move it
  49 to the top of the list.  The `min-colors' attribute will be removed from
  50 any other entries, and any resulting duplicates will be removed entirely."
  51   (cond
  52    ((and inherits (facep inherits)
  53          (not (featurep 'xemacs)) (> emacs-major-version 22))
  54     ;; In Emacs 23, we use inheritance where possible.
  55     ;; We only do this in Emacs 23, because only there the outline
  56     ;; faces have been changed to the original org-mode-level-faces.
  57     (list (list t :inherit inherits)))
  58    ((or (featurep 'xemacs) (< emacs-major-version 22))
  59     ;; These do not understand the `min-colors' attribute.
  60     (let (r e a)
  61       (while (setq e (pop specs))
  62         (cond
  63          ((memq (car e) '(t default)) (push e r))
  64          ((setq a (member '(min-colors 8) (car e)))
  65           (nconc r (list (cons (cons '(type tty) (delq (car a) (car e)))
  66                                (cdr e)))))
  67          ((setq a (assq 'min-colors (car e)))
  68           (setq e (cons (delq a (car e)) (cdr e)))
  69           (or (assoc (car e) r) (push e r)))
  70          (t (or (assoc (car e) r) (push e r)))))
  71       (nreverse r)))
  72    (t specs)))
  73 (put 'org-compatible-face 'lisp-indent-function 1)
  74
  75 ;;;; Emacs/XEmacs compatibility
  76
  77 ;; Overlay compatibility functions
  78 (defun org-make-overlay (beg end &optional buffer)
  79   (if (featurep 'xemacs)
  80       (make-extent beg end buffer)
  81     (make-overlay beg end buffer)))
  82 (defun org-delete-overlay (ovl)
  83   (if (featurep 'xemacs) (progn (delete-extent ovl) nil) (delete-overlay ovl)))
  84 (defun org-detach-overlay (ovl)
  85   (if (featurep 'xemacs) (detach-extent ovl) (delete-overlay ovl)))
  86 (defun org-move-overlay (ovl beg end &optional buffer)
  87   (if (featurep 'xemacs)
  88       (set-extent-endpoints ovl beg end (or buffer (current-buffer)))
  89     (move-overlay ovl beg end buffer)))
  90 (defun org-overlay-put (ovl prop value)
  91   (if (featurep 'xemacs)
  92       (set-extent-property ovl prop value)
  93     (overlay-put ovl prop value)))
  94 (defun org-overlay-display (ovl text &optional face evap)
  95   "Make overlay OVL display TEXT with face FACE."
  96   (if (featurep 'xemacs)
  97       (let ((gl (make-glyph text)))
  98         (and face (set-glyph-face gl face))
  99         (set-extent-property ovl 'invisible t)
 100         (set-extent-property ovl 'end-glyph gl))
 101     (overlay-put ovl 'display text)
 102     (if face (overlay-put ovl 'face face))
 103     (if evap (overlay-put ovl 'evaporate t))))
 104 (defun org-overlay-before-string (ovl text &optional face evap)
 105   "Make overlay OVL display TEXT with face FACE."
 106   (if (featurep 'xemacs)
 107       (let ((gl (make-glyph text)))
 108         (and face (set-glyph-face gl face))
 109         (set-extent-property ovl 'begin-glyph gl))
 110     (if face (org-add-props text nil 'face face))
 111     (overlay-put ovl 'before-string text)
 112     (if evap (overlay-put ovl 'evaporate t))))
 113 (defun org-overlay-get (ovl prop)
 114   (if (featurep 'xemacs)
 115       (extent-property ovl prop)
 116     (overlay-get ovl prop)))
 117 (defun org-overlays-at (pos)
 118   (if (featurep 'xemacs) (extents-at pos) (overlays-at pos)))
 119 (defun org-overlays-in (&optional start end)
 120   (if (featurep 'xemacs)
 121       (extent-list nil start end)
 122     (overlays-in start end)))
 123 (defun org-overlay-start (o)
 124   (if (featurep 'xemacs) (extent-start-position o) (overlay-start o)))
 125 (defun org-overlay-end (o)
 126   (if (featurep 'xemacs) (extent-end-position o) (overlay-end o)))
 127 (defun org-overlay-buffer (o)
 128   (if (featurep 'xemacs) (extent-buffer o) (overlay-buffer o)))
 129 (defun org-find-overlays (prop &optional pos delete)
 130   "Find all overlays specifying PROP at POS or point.
 131 If DELETE is non-nil, delete all those overlays."
 132   (let ((overlays (org-overlays-at (or pos (point))))
 133         ov found)
 134     (while (setq ov (pop overlays))
 135       (if (org-overlay-get ov prop)
 136           (if delete (org-delete-overlay ov) (push ov found))))
 137     found))
 138
 139 (defun org-add-hook (hook function &optional append local)
 140   "Add-hook, compatible with both Emacsen."
 141   (if (and local (featurep 'xemacs))
 142       (add-local-hook hook function append)
 143     (add-hook hook function append local)))
 144
 145 (defun org-add-props (string plist &rest props)
 146   "Add text properties to entire string, from beginning to end.
 147 PLIST may be a list of properties, PROPS are individual properties and values
 148 that will be added to PLIST.  Returns the string that was modified."
 149   (add-text-properties
 150    0 (length string) (if props (append plist props) plist) string)
 151   string)
 152 (put 'org-add-props 'lisp-indent-function 2)
 153
 154 (defun org-fit-window-to-buffer (&optional window max-height min-height
 155                                            shrink-only)
 156   "Fit WINDOW to the buffer, but only if it is not a side-by-side window.
 157 WINDOW defaults to the selected window.  MAX-HEIGHT and MIN-HEIGHT are
 158 passed through to `fit-window-to-buffer'.  If SHRINK-ONLY is set, call
 159 `shrink-window-if-larger-than-buffer' instead, the hight limit are
 160 ignored in this case."
 161   (cond ((if (fboundp 'window-full-width-p)
 162              (not (window-full-width-p window))
 163            (> (frame-width) (window-width window)))
 164          ;; do nothing if another window would suffer
 165          )
 166         ((and (fboundp 'fit-window-to-buffer) (not shrink-only))
 167          (fit-window-to-buffer window max-height min-height))
 168         ((fboundp 'shrink-window-if-larger-than-buffer)
 169          (shrink-window-if-larger-than-buffer window)))
 170   (or window (selected-window)))
 171
 172 ;; Region compatibility
 173
 174 (defvar org-ignore-region nil
 175   "To temporarily disable the active region.")
 176
 177 (defun org-region-active-p ()
 178   "Is `transient-mark-mode' on and the region active?
 179 Works on both Emacs and XEmacs."
 180   (if org-ignore-region
 181       nil
 182     (if (featurep 'xemacs)
 183         (and zmacs-regions (region-active-p))
 184       (if (fboundp 'use-region-p)
 185           (use-region-p)
 186         (and transient-mark-mode mark-active))))) ; Emacs 22 and before
 187
 188 ;; Invisibility compatibility
 189
 190 (defun org-add-to-invisibility-spec (arg)
 191   "Add elements to `buffer-invisibility-spec'.
 192 See documentation for `buffer-invisibility-spec' for the kind of elements
 193 that can be added."
 194   (cond
 195    ((fboundp 'add-to-invisibility-spec)
 196     (add-to-invisibility-spec arg))
 197    ((or (null buffer-invisibility-spec) (eq buffer-invisibility-spec t))
 198     (setq buffer-invisibility-spec (list arg)))
 199    (t
 200     (setq buffer-invisibility-spec
 201           (cons arg buffer-invisibility-spec)))))
 202
 203 (defun org-remove-from-invisibility-spec (arg)
 204   "Remove elements from `buffer-invisibility-spec'."
 205   (if (fboundp 'remove-from-invisibility-spec)
 206       (remove-from-invisibility-spec arg)
 207     (if (consp buffer-invisibility-spec)
 208         (setq buffer-invisibility-spec
 209               (delete arg buffer-invisibility-spec)))))
 210
 211 (defun org-in-invisibility-spec-p (arg)
 212   "Is ARG a member of `buffer-invisibility-spec'?"
 213   (if (consp buffer-invisibility-spec)
 214       (member arg buffer-invisibility-spec)
 215     nil))
 216
 217 (defun org-indent-to-column (column &optional minimum buffer)
 218   "Work around a bug with extents with invisibility in XEmacs."
 219   (if (featurep 'xemacs)
 220       (let ((ext-inv (extent-list
 221                       nil (point-at-bol) (point-at-eol)
 222                       'all-extents-closed-open 'invisible))
 223             ext-inv-specs)
 224         (dolist (ext ext-inv)
 225           (when (extent-property ext 'invisible)
 226             (add-to-list 'ext-inv-specs (list ext (extent-property
 227                                                    ext 'invisible)))
 228             (set-extent-property ext 'invisible nil)))
 229         (indent-to-column column minimum buffer)
 230         (dolist (ext-inv-spec ext-inv-specs)
 231           (set-extent-property (car ext-inv-spec) 'invisible
 232                                (cadr ext-inv-spec))))
 233     (indent-to-column column minimum)))
 234
 235 (defun org-indent-line-to (column)
 236   "Work around a bug with extents with invisibility in XEmacs."
 237   (if (featurep 'xemacs)
 238       (let ((ext-inv (extent-list
 239                       nil (point-at-bol) (point-at-eol)
 240                       'all-extents-closed-open 'invisible))
 241             ext-inv-specs)
 242         (dolist (ext ext-inv)
 243           (when (extent-property ext 'invisible)
 244             (add-to-list 'ext-inv-specs (list ext (extent-property
 245                                                    ext 'invisible)))
 246             (set-extent-property ext 'invisible nil)))
 247         (indent-line-to column)
 248         (dolist (ext-inv-spec ext-inv-specs)
 249           (set-extent-property (car ext-inv-spec) 'invisible
 250                                (cadr ext-inv-spec))))
 251     (indent-line-to column)))
 252
 253 (defun org-move-to-column (column &optional force buffer)
 254   (if (featurep 'xemacs)
 255       (let ((ext-inv (extent-list
 256                       nil (point-at-bol) (point-at-eol)
 257                       'all-extents-closed-open 'invisible))
 258             ext-inv-specs)
 259         (dolist (ext ext-inv)
 260           (when (extent-property ext 'invisible)
 261             (add-to-list 'ext-inv-specs (list ext (extent-property ext
 262                                                                    'invisible)))
 263             (set-extent-property ext 'invisible nil)))
 264         (move-to-column column force buffer)
 265         (dolist (ext-inv-spec ext-inv-specs)
 266           (set-extent-property (car ext-inv-spec) 'invisible
 267                                (cadr ext-inv-spec))))
 268     (move-to-column column force)))
 269
 270 (defun org-get-x-clipboard-compat (value)
 271   "Get the clipboard value on XEmacs or Emacs 21"
 272   (cond (org-xemacs-p (org-no-warnings (get-selection-no-error value)))
 273         ((fboundp 'x-get-selection)
 274          (condition-case nil
 275              (or (x-get-selection value 'UTF8_STRING)
 276                  (x-get-selection value 'COMPOUND_TEXT)
 277                  (x-get-selection value 'STRING)
 278                  (x-get-selection value 'TEXT))
 279            (error nil)))))
 280
 281 (defun org-propertize (string &rest properties)
 282   (if (featurep 'xemacs)
 283       (progn
 284         (add-text-properties 0 (length string) properties string)
 285         string)
 286     (apply 'propertize string properties)))
 287
 288 (defun org-substring-no-properties (string &optional from to)
 289   (if (featurep 'xemacs)
 290       (org-no-properties (substring string (or from 0) to))
 291     (substring-no-properties string from to)))
 292
 293 (defun org-count-lines (s)
 294   "How many lines in string S?"
 295   (let ((start 0) (n 1))
 296     (while (string-match "\n" s start)
 297       (setq start (match-end 0) n (1+ n)))
 298     (if (and (> (length s) 0) (= (aref s (1- (length s))) ?\n))
 299         (setq n (1- n)))
 300     n))
 301
 302 (provide 'org-compat)
 303
 304 ;; arch-tag: a0a0579f-e68c-4bdf-9e55-93768b846bbe
 305
 306 ;;; org-compat.el ends here