lisp/org-compat.el

   1 ;;; org-compat.el --- Compatibility Code for Older Emacsen -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2004-2016 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 older
  28 ;; versions of GNU Emacs.
  29
  30 ;;; Code:
  31
  32 (require 'cl-lib)
  33 (require 'org-macs)
  34
  35 (declare-function org-at-table.el-p "org" (&optional table-type))
  36 (declare-function org-element-at-point "org-element" ())
  37 (declare-function org-element-type "org-element" (element))
  38 (declare-function org-link-set-parameters "org" (type &rest rest))
  39 (declare-function org-table-end (&optional table-type))
  40 (declare-function table--at-cell-p "table" (position &optional object at-column))
  41
  42 (defvar org-table-any-border-regexp)
  43 (defvar org-table-dataline-regexp)
  44 (defvar org-table-tab-recognizes-table.el)
  45 (defvar org-table1-hline-regexp)
  46
  47 ;; As of Emacs 25.1, `outline-mode' functions are under the 'outline-'
  48 ;; prefix, `find-tag' is replaced with `xref-find-definition' and
  49 ;; `x-get-selection' with `gui-get-selection'.
  50 (when (< emacs-major-version 25)
  51   (defalias 'outline-hide-entry 'hide-entry)
  52   (defalias 'outline-hide-sublevels 'hide-sublevels)
  53   (defalias 'outline-hide-subtree 'hide-subtree)
  54   (defalias 'outline-show-all 'show-all)
  55   (defalias 'outline-show-branches 'show-branches)
  56   (defalias 'outline-show-children 'show-children)
  57   (defalias 'outline-show-entry 'show-entry)
  58   (defalias 'outline-show-subtree 'show-subtree)
  59   (defalias 'xref-find-definitions 'find-tag)
  60   (defalias 'format-message 'format)
  61   (defalias 'gui-get-selection 'x-get-selection))
  62
  63 \f
  64 ;;; Obsolete aliases (remove them once the next major release is released).
  65
  66 ;;;; XEmacs compatibility, now removed.
  67 (define-obsolete-function-alias 'org-activate-mark 'activate-mark)
  68 (define-obsolete-function-alias 'org-add-hook 'add-hook "Org 9.0")
  69 (define-obsolete-function-alias 'org-bound-and-true-p 'bound-and-true-p "Org 9.0")
  70 (define-obsolete-function-alias 'org-decompose-region 'decompose-region "Org 9.0")
  71 (define-obsolete-function-alias 'org-defvaralias 'defvaralias "Org 9.0")
  72 (define-obsolete-function-alias 'org-detach-overlay 'delete-overlay "Org 9.0")
  73 (define-obsolete-function-alias 'org-file-equal-p 'file-equal-p "Org 9.0")
  74 (define-obsolete-function-alias 'org-float-time 'float-time "Org 9.0")
  75 (define-obsolete-function-alias 'org-indent-line-to 'indent-line-to "Org 9.0")
  76 (define-obsolete-function-alias 'org-indent-to-column 'indent-to-column "Org 9.0")
  77 (define-obsolete-function-alias 'org-looking-at-p 'looking-at-p "Org 9.0")
  78 (define-obsolete-function-alias 'org-looking-back 'looking-back "Org 9.0")
  79 (define-obsolete-function-alias 'org-match-string-no-properties 'match-string-no-properties "Org 9.0")
  80 (define-obsolete-function-alias 'org-propertize 'propertize "Org 9.0")
  81 (define-obsolete-function-alias 'org-select-frame-set-input-focus 'select-frame-set-input-focus "Org 9.0")
  82
  83 (defmacro org-re (s)
  84   "Replace posix classes in regular expression S."
  85   (declare (debug (form))
  86            (obsolete "you can safely remove it." "Org 9.0"))
  87   s)
  88
  89 ;;;; Functions from cl-lib that Org used to have its own implementation of.
  90 (define-obsolete-function-alias 'org-count 'cl-count "Org 9.0")
  91 (define-obsolete-function-alias 'org-every 'cl-every "Org 9.0")
  92 (define-obsolete-function-alias 'org-find-if 'cl-find-if "Org 9.0")
  93 (define-obsolete-function-alias 'org-reduce 'cl-reduce "Org 9.0")
  94 (define-obsolete-function-alias 'org-remove-if 'cl-remove-if "Org 9.0")
  95 (define-obsolete-function-alias 'org-remove-if-not 'cl-remove-if-not "Org 9.0")
  96 (define-obsolete-function-alias 'org-some 'cl-some "Org 9.0")
  97 (define-obsolete-function-alias 'org-floor* 'cl-floor "Org 9.0")
  98
  99 (defun org-sublist (list start end)
 100   "Return a section of LIST, from START to END.
 101 Counting starts at 1."
 102   (cl-subseq list (1- start) end))
 103 (make-obsolete 'org-sublist
 104                "use cl-subseq (note the 0-based counting)."
 105                "Org 9.0")
 106
 107
 108 ;;;; Functions available since Emacs 24.3
 109 (define-obsolete-function-alias 'org-buffer-narrowed-p 'buffer-narrowed-p "Org 9.0")
 110 (define-obsolete-function-alias 'org-called-interactively-p 'called-interactively-p "Org 9.0")
 111 (define-obsolete-function-alias 'org-char-to-string 'char-to-string "Org 9.0")
 112 (define-obsolete-function-alias 'org-delete-directory 'delete-directory "Org 9.0")
 113 (define-obsolete-function-alias 'org-format-seconds 'format-seconds "Org 9.0")
 114 (define-obsolete-function-alias 'org-link-escape-browser 'url-encode-url "Org 9.0")
 115 (define-obsolete-function-alias 'org-no-warnings 'with-no-warnings "Org 9.0")
 116 (define-obsolete-function-alias 'org-number-sequence 'number-sequence "Org 9.0")
 117 (define-obsolete-function-alias 'org-pop-to-buffer-same-window 'pop-to-buffer-same-window "Org 9.0")
 118 (define-obsolete-function-alias 'org-string-match-p 'string-match-p "Org 9.0")
 119
 120 ;;;; Functions and variables from previous releases now obsolete.
 121 (define-obsolete-function-alias 'org-element-remove-indentation
 122   'org-remove-indentation "Org 9.0")
 123 (define-obsolete-variable-alias 'org-hierarchical-checkbox-statistics
 124   'org-checkbox-hierarchical-statistics "Org 8.0")
 125 (define-obsolete-variable-alias 'org-description-max-indent
 126   'org-list-description-max-indent "Org 8.0")
 127 (define-obsolete-variable-alias 'org-latex-create-formula-image-program
 128   'org-preview-latex-default-process "Org 9.0")
 129 (define-obsolete-variable-alias 'org-latex-preview-ltxpng-directory
 130  'org-preview-latex-image-directory "Org 9.0")
 131 (define-obsolete-function-alias 'org-table-p 'org-at-table-p "Org 9.0")
 132 (define-obsolete-function-alias 'org-on-heading-p 'org-at-heading-p "Org 9.0")
 133 (define-obsolete-function-alias 'org-at-regexp-p 'org-in-regexp "Org 8.3")
 134 (define-obsolete-function-alias 'org-speed-command-default-hook
 135   'org-speed-command-activate "Org 8.0")
 136 (define-obsolete-function-alias 'org-babel-speed-command-hook
 137   'org-babel-speed-command-activate "Org 8.0")
 138 (define-obsolete-function-alias 'org-image-file-name-regexp
 139   'image-file-name-regexp "Org 9.0")
 140 (define-obsolete-function-alias 'org-get-legal-level
 141   'org-get-valid-level "Org 7.8")
 142 (define-obsolete-function-alias 'org-completing-read-no-i
 143   'completing-read "Org 9.0")
 144 (define-obsolete-function-alias 'org-icompleting-read
 145   'completing-read "Org 9.0")
 146 (define-obsolete-function-alias 'org-iread-file-name 'read-file-name "Org 9.0")
 147 (define-obsolete-function-alias 'org-days-to-time
 148   'org-time-stamp-to-now "Org 8.2")
 149 (define-obsolete-variable-alias 'org-agenda-ignore-drawer-properties
 150   'org-agenda-ignore-properties "Org 9.0")
 151 (define-obsolete-function-alias 'org-preview-latex-fragment
 152   'org-toggle-latex-fragment "Org 8.3")
 153 (define-obsolete-function-alias 'org-display-inline-modification-hook
 154   'org-display-inline-remove-overlay "Org 8.0")
 155 (define-obsolete-function-alias 'org-export-get-genealogy
 156   'org-element-lineage "Org 9.0")
 157 (define-obsolete-variable-alias 'org-latex-with-hyperref
 158   'org-latex-hyperref-template "Org 9.0")
 159 (define-obsolete-variable-alias 'org-link-to-org-use-id
 160   'org-id-link-to-org-use-id "Org 8.0")
 161 (define-obsolete-variable-alias 'hfy-optimisations 'hfy-optimizations "Org 9.0")
 162 (define-obsolete-variable-alias 'org-clock-modeline-total
 163   'org-clock-mode-line-total "Org 8.0")
 164 (define-obsolete-function-alias 'org-protocol-unhex-compound
 165   'org-link-unescape-compound "Org 7.8")
 166 (define-obsolete-function-alias 'org-protocol-unhex-string
 167   'org-link-unescape "Org 7.8")
 168 (define-obsolete-function-alias 'org-protocol-unhex-single-byte-sequence
 169   'org-link-unescape-single-byte-sequence "Org 7.8")
 170 (define-obsolete-variable-alias 'org-export-htmlized-org-css-url
 171   'org-org-htmlized-css-url "Org 8.2")
 172 (define-obsolete-variable-alias 'org-alphabetical-lists
 173   'org-list-allow-alphabetical "Org 8.0")
 174 (define-obsolete-function-alias 'org-list-parse-list 'org-list-to-lisp "Org 9.0")
 175 (define-obsolete-variable-alias 'org-agenda-menu-two-column
 176   'org-agenda-menu-two-columns "Org 8.0")
 177 (define-obsolete-variable-alias 'org-finalize-agenda-hook
 178   'org-agenda-finalize-hook "Org 8.0")
 179 (make-obsolete-variable 'org-agenda-ndays 'org-agenda-span "Org 7.8")
 180 (define-obsolete-function-alias 'org-agenda-post-command-hook
 181   'org-agenda-update-agenda-type "Org 8.0")
 182 (define-obsolete-function-alias 'org-agenda-todayp
 183   'org-agenda-today-p "Org 9.0")
 184 (define-obsolete-function-alias 'org-babel-examplize-region
 185   'org-babel-examplify-region "Org 9.0")
 186 (define-obsolete-function-alias 'org-babel-trim 'org-trim "Org 9.0")
 187 (define-obsolete-variable-alias 'org-html-style-include-scripts
 188   'org-html-head-include-scripts "Org 8.0")
 189 (define-obsolete-variable-alias 'org-html-style-include-default
 190   'org-html-head-include-default-style "Org 8.0")
 191 (define-obsolete-variable-alias 'org-html-style 'org-html-head "24.4")
 192 (define-obsolete-function-alias 'org-insert-columns-dblock
 193   'org-columns-insert-dblock "Org 9.0")
 194
 195 (defun org-in-fixed-width-region-p ()
 196   "Non-nil if point in a fixed-width region."
 197   (save-match-data
 198     (eq 'fixed-width (org-element-type (org-element-at-point)))))
 199 (make-obsolete 'org-in-fixed-width-region-p
 200                "use `org-element' library"
 201                "Org 9.0")
 202
 203 (defcustom org-read-date-minibuffer-setup-hook nil
 204   "Hook to be used to set up keys for the date/time interface.
 205 Add key definitions to `minibuffer-local-map', which will be a
 206 temporary copy."
 207   :group 'org-time
 208   :type 'hook)
 209 (make-obsolete-variable
 210  'org-read-date-minibuffer-setup-hook
 211  "set `org-read-date-minibuffer-local-map' instead." "Org 8.0")
 212
 213 (defun org-compatible-face (inherits specs)
 214   "Make a compatible face specification.
 215 If INHERITS is an existing face and if the Emacs version supports
 216 it, just inherit the face.  If INHERITS is not given and SPECS
 217 is, use SPECS to define the face."
 218   (declare (indent 1))
 219   (if (facep inherits)
 220       (list (list t :inherit inherits))
 221     specs))
 222 (make-obsolete 'org-compatible-face "you can remove it." "Org 9.0")
 223
 224 (defun org-add-link-type (type &optional follow export)
 225   "Add a new TYPE link.
 226 FOLLOW and EXPORT are two functions.
 227
 228 FOLLOW should take the link path as the single argument and do whatever
 229 is necessary to follow the link, for example find a file or display
 230 a mail message.
 231
 232 EXPORT should format the link path for export to one of the export formats.
 233 It should be a function accepting three arguments:
 234
 235   path    the path of the link, the text after the prefix (like \"http:\")
 236   desc    the description of the link, if any
 237   format  the export format, a symbol like `html' or `latex' or `ascii'.
 238
 239 The function may use the FORMAT information to return different values
 240 depending on the format.  The return value will be put literally into
 241 the exported file.  If the return value is nil, this means Org should
 242 do what it normally does with links which do not have EXPORT defined.
 243
 244 Org mode has a built-in default for exporting links.  If you are happy with
 245 this default, there is no need to define an export function for the link
 246 type.  For a simple example of an export function, see `org-bbdb.el'.
 247
 248 If TYPE already exists, update it with the arguments.
 249 See `org-link-parameters' for documentation on the other parameters."
 250   (org-link-set-parameters type :follow follow :export export)
 251   (message "Created %s link." type))
 252
 253 (make-obsolete 'org-add-link-type "use `org-link-set-parameters' instead." "Org 9.0")
 254
 255 (defun org-table-recognize-table.el ()
 256   "If there is a table.el table nearby, recognize it and move into it."
 257   (when (and org-table-tab-recognizes-table.el (org-at-table.el-p))
 258     (beginning-of-line)
 259     (unless (or (looking-at org-table-dataline-regexp)
 260                 (not (looking-at org-table1-hline-regexp)))
 261       (forward-line)
 262       (when (looking-at org-table-any-border-regexp)
 263         (forward-line -2)))
 264     (if (re-search-forward "|" (org-table-end t) t)
 265         (progn
 266           (require 'table)
 267           (if (table--at-cell-p (point)) t
 268             (message "recognizing table.el table...")
 269             (table-recognize-table)
 270             (message "recognizing table.el table...done")))
 271       (error "This should not happen"))))
 272
 273 ;; Not used by Org core since commit 6d1e3082, Feb 2010.
 274 (make-obsolete 'org-table-recognize-table.el
 275                "please notify the org mailing list if you use this function."
 276                "Org 9.0")
 277
 278 (define-obsolete-function-alias
 279   'org-minutes-to-hh:mm-string 'org-minutes-to-clocksum-string "Org 8.0")
 280
 281 (defun org-remove-angle-brackets (s)
 282   (org-unbracket-string "<" ">" s))
 283 (make-obsolete 'org-remove-angle-brackets 'org-unbracket-string "Org 9.0")
 284
 285 (defun org-remove-double-quotes (s)
 286   (org-unbracket-string "\"" "\"" s))
 287 (make-obsolete 'org-remove-double-quotes 'org-unbracket-string "Org 9.0")
 288
 289 ;;;; Obsolete link types
 290
 291 (eval-after-load 'org
 292   '(progn
 293      (org-link-set-parameters "file+emacs") ;since Org 9.0
 294      (org-link-set-parameters "file+sys"))) ;since Org 9.0
 295
 296
 297 \f
 298 ;;; Miscellaneous functions
 299
 300 (defun org-version-check (version feature level)
 301   (let* ((v1 (mapcar 'string-to-number (split-string version "[.]")))
 302          (v2 (mapcar 'string-to-number (split-string emacs-version "[.]")))
 303          (rmaj (or (nth 0 v1) 99))
 304          (rmin (or (nth 1 v1) 99))
 305          (rbld (or (nth 2 v1) 99))
 306          (maj (or (nth 0 v2) 0))
 307          (min (or (nth 1 v2) 0))
 308          (bld (or (nth 2 v2) 0)))
 309     (if (or (< maj rmaj)
 310             (and (= maj rmaj)
 311                  (< min rmin))
 312             (and (= maj rmaj)
 313                  (= min rmin)
 314                  (< bld rbld)))
 315         (if (eq level :predicate)
 316             ;; just return if we have the version
 317             nil
 318           (let ((msg (format "Emacs %s or greater is recommended for %s"
 319                              version feature)))
 320             (display-warning 'org msg level)
 321             t))
 322       t)))
 323
 324 (defun org-get-x-clipboard (value)
 325   "Get the value of the X or Windows clipboard."
 326   (cond ((and (eq window-system 'x)
 327               (fboundp 'gui-get-selection)) ;Silence byte-compiler.
 328          (org-no-properties
 329           (ignore-errors
 330             (or (gui-get-selection value 'UTF8_STRING)
 331                 (gui-get-selection value 'COMPOUND_TEXT)
 332                 (gui-get-selection value 'STRING)
 333                 (gui-get-selection value 'TEXT)))))
 334         ((and (eq window-system 'w32) (fboundp 'w32-get-clipboard-data))
 335          (w32-get-clipboard-data))))
 336
 337 (defun org-add-props (string plist &rest props)
 338   "Add text properties to entire string, from beginning to end.
 339 PLIST may be a list of properties, PROPS are individual properties and values
 340 that will be added to PLIST.  Returns the string that was modified."
 341   (add-text-properties
 342    0 (length string) (if props (append plist props) plist) string)
 343   string)
 344 (put 'org-add-props 'lisp-indent-function 2)
 345
 346 (defun org-fit-window-to-buffer (&optional window max-height min-height
 347                                            shrink-only)
 348   "Fit WINDOW to the buffer, but only if it is not a side-by-side window.
 349 WINDOW defaults to the selected window.  MAX-HEIGHT and MIN-HEIGHT are
 350 passed through to `fit-window-to-buffer'.  If SHRINK-ONLY is set, call
 351 `shrink-window-if-larger-than-buffer' instead, the height limit is
 352 ignored in this case."
 353   (cond ((if (fboundp 'window-full-width-p)
 354              (not (window-full-width-p window))
 355            ;; do nothing if another window would suffer
 356            (> (frame-width) (window-width window))))
 357         ((and (fboundp 'fit-window-to-buffer) (not shrink-only))
 358          (fit-window-to-buffer window max-height min-height))
 359         ((fboundp 'shrink-window-if-larger-than-buffer)
 360          (shrink-window-if-larger-than-buffer window)))
 361   (or window (selected-window)))
 362
 363 ;; `set-transient-map' is only in Emacs >= 24.4
 364 (defalias 'org-set-transient-map
 365   (if (fboundp 'set-transient-map)
 366       'set-transient-map
 367     'set-temporary-overlay-map))
 368
 369 ;;; Region compatibility
 370
 371 (defvar org-ignore-region nil
 372   "Non-nil means temporarily disable the active region.")
 373
 374 (defun org-region-active-p ()
 375   "Non-nil when the region active.
 376 Unlike to `use-region-p', this function also checks
 377 `org-ignore-region'."
 378   (and (not org-ignore-region) (use-region-p)))
 379
 380 (defun org-cursor-to-region-beginning ()
 381   (when (and (org-region-active-p)
 382              (> (point) (region-beginning)))
 383     (exchange-point-and-mark)))
 384
 385 ;;; Invisibility compatibility
 386
 387 (defun org-remove-from-invisibility-spec (arg)
 388   "Remove elements from `buffer-invisibility-spec'."
 389   (if (fboundp 'remove-from-invisibility-spec)
 390       (remove-from-invisibility-spec arg)
 391     (if (consp buffer-invisibility-spec)
 392         (setq buffer-invisibility-spec
 393               (delete arg buffer-invisibility-spec)))))
 394
 395 (defun org-in-invisibility-spec-p (arg)
 396   "Is ARG a member of `buffer-invisibility-spec'?"
 397   (if (consp buffer-invisibility-spec)
 398       (member arg buffer-invisibility-spec)))
 399
 400 (defun org-move-to-column (column &optional force _buffer)
 401   "Move to column COLUMN.
 402 Pass COLUMN and FORCE to `move-to-column'."
 403   (let ((buffer-invisibility-spec
 404          (if (listp buffer-invisibility-spec)
 405              (remove '(org-filtered) buffer-invisibility-spec)
 406            buffer-invisibility-spec)))
 407     (move-to-column column force)))
 408
 409 (defmacro org-find-library-dir (library)
 410   `(file-name-directory (or (locate-library ,library) "")))
 411
 412 (defun org-count-lines (s)
 413   "How many lines in string S?"
 414   (let ((start 0) (n 1))
 415     (while (string-match "\n" s start)
 416       (setq start (match-end 0) n (1+ n)))
 417     (if (and (> (length s) 0) (= (aref s (1- (length s))) ?\n))
 418         (setq n (1- n)))
 419     n))
 420
 421 (defun org-kill-new (string &rest args)
 422   (remove-text-properties 0 (length string) '(line-prefix t wrap-prefix t)
 423                           string)
 424   (apply 'kill-new string args))
 425
 426 ;; `font-lock-ensure' is only available from 24.4.50 on
 427 (defalias 'org-font-lock-ensure
 428   (if (fboundp 'font-lock-ensure)
 429       #'font-lock-ensure
 430     (lambda (&optional _beg _end)
 431       (with-no-warnings (font-lock-fontify-buffer)))))
 432
 433 (defmacro org-no-popups (&rest body)
 434   "Suppress popup windows.
 435 Let-bind some variables to nil around BODY to achieve the desired
 436 effect, which variables to use depends on the Emacs version."
 437   (if (org-version-check "24.2.50" "" :predicate)
 438       `(let (pop-up-frames display-buffer-alist)
 439          ,@body)
 440     `(let (pop-up-frames special-display-buffer-names special-display-regexps special-display-function)
 441        ,@body)))
 442
 443 ;;;###autoload
 444 (defmacro org-check-version ()
 445   "Try very hard to provide sensible version strings."
 446   (let* ((org-dir        (org-find-library-dir "org"))
 447          (org-version.el (concat org-dir "org-version.el"))
 448          (org-fixup.el   (concat org-dir "../mk/org-fixup.el")))
 449     (if (require 'org-version org-version.el 'noerror)
 450         '(progn
 451            (autoload 'org-release     "org-version.el")
 452            (autoload 'org-git-version "org-version.el"))
 453       (if (require 'org-fixup org-fixup.el 'noerror)
 454           '(org-fixup)
 455         ;; provide fallback definitions and complain
 456         (warn "Could not define org version correctly.  Check installation!")
 457         '(progn
 458            (defun org-release () "N/A")
 459            (defun org-git-version () "N/A !!check installation!!"))))))
 460
 461 (defmacro org-with-silent-modifications (&rest body)
 462   (if (fboundp 'with-silent-modifications)
 463       `(with-silent-modifications ,@body)
 464     `(org-unmodified ,@body)))
 465 (def-edebug-spec org-with-silent-modifications (body))
 466
 467 ;; Functions for Emacs < 24.4 compatibility
 468 (defun org-define-error (name message)
 469   "Define NAME as a new error signal.
 470 MESSAGE is a string that will be output to the echo area if such
 471 an error is signaled without being caught by a `condition-case'.
 472 Implements `define-error' for older emacsen."
 473   (if (fboundp 'define-error) (define-error name message)
 474     (put name 'error-conditions
 475          (copy-sequence (cons name (get 'error 'error-conditions))))))
 476
 477 (unless (fboundp 'string-suffix-p)
 478   ;; From Emacs subr.el.
 479   (defun string-prefix-p (prefix string &optional ignore-case)
 480     "Return non-nil if PREFIX is a prefix of STRING.
 481 If IGNORE-CASE is non-nil, the comparison is done without paying attention
 482 to case differences."
 483     (let ((prefix-length (length prefix)))
 484       (if (> prefix-length (length string)) nil
 485         (eq t (compare-strings prefix 0 prefix-length string
 486                                0 prefix-length ignore-case)))))
 487
 488   (defun string-suffix-p (suffix string  &optional ignore-case)
 489     "Return non-nil if SUFFIX is a suffix of STRING.
 490 If IGNORE-CASE is non-nil, the comparison is done without paying
 491 attention to case differences."
 492     (let ((start-pos (- (length string) (length suffix))))
 493       (and (>= start-pos 0)
 494            (eq t (compare-strings suffix nil nil
 495                                   string start-pos nil ignore-case))))))
 496
 497 (provide 'org-compat)
 498
 499 ;;; org-compat.el ends here