lisp/org-src.el

   1 ;;; org-src.el --- Source code examples in Org
   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 ;;         Bastien Guerry <bzg AT altern DOT org>
   8 ;; Keywords: outlines, hypermedia, calendar, wp
   9 ;; Homepage: http://orgmode.org
  10 ;; Version: 6.31trans
  11 ;;
  12 ;; This file is part of GNU Emacs.
  13 ;;
  14 ;; GNU Emacs is free software: you can redistribute it and/or modify
  15 ;; it under the terms of the GNU General Public License as published by
  16 ;; the Free Software Foundation, either version 3 of the License, or
  17 ;; (at your option) any later version.
  18
  19 ;; GNU Emacs is distributed in the hope that it will be useful,
  20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 ;; GNU General Public License for more details.
  23
  24 ;; You should have received a copy of the GNU General Public License
  25 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  26 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  27 ;;
  28 ;;; Commentary:
  29
  30 ;; This file contains the code dealing with source code examples in Org-mode.
  31
  32 ;;; Code:
  33
  34 (require 'org-macs)
  35 (require 'org-compat)
  36
  37 (declare-function org-do-remove-indentation "org" (&optional n))
  38 (declare-function org-get-indentation "org" (&optional line))
  39
  40 (defcustom org-edit-src-region-extra nil
  41   "Additional regexps to identify regions for editing with `org-edit-src-code'.
  42 For examples see the function `org-edit-src-find-region-and-lang'.
  43 The regular expression identifying the begin marker should end with a newline,
  44 and the regexp marking the end line should start with a newline, to make sure
  45 there are kept outside the narrowed region."
  46   :group 'org-edit-structure
  47   :type '(repeat
  48           (list
  49            (regexp :tag "begin regexp")
  50            (regexp :tag "end regexp")
  51            (choice :tag "language"
  52                    (string :tag "specify")
  53                    (integer :tag "from match group")
  54                    (const :tag "from `lang' element")
  55                    (const :tag "from `style' element")))))
  56
  57 (defcustom org-coderef-label-format "(ref:%s)"
  58   "The default coderef format.
  59 This format string will be used to search for coderef labels in literal
  60 examples (EXAMPLE and SRC blocks).  The format can be overwritten in
  61 an individual literal example with the -f option, like
  62
  63 #+BEGIN_SRC pascal +n -r -l \"((%s))\"
  64 ...
  65 #+END_SRC
  66
  67 If you want to use this for HTML export, make sure that the format does
  68 not introduce special font-locking, and avoid the HTML special
  69 characters `<', `>', and `&'.  The reason for this restriction is that
  70 the labels are searched for only after htmlize has done its job."
  71   :group 'org-edit-structure ; FIXME this is not in the right group
  72   :type 'string)
  73
  74 (defcustom org-edit-fixed-width-region-mode 'artist-mode
  75   "The mode that should be used to edit fixed-width regions.
  76 These are the regions where each line starts with a colon."
  77   :group 'org-edit-structure
  78   :type '(choice
  79           (const artist-mode)
  80           (const picture-mode)
  81           (const fundamental-mode)
  82           (function :tag "Other (specify)")))
  83
  84 (defcustom org-src-preserve-indentation nil
  85   "If non-nil, leading whitespace characters in source code
  86   blocks are preserved. Otherwise, after editing with
  87   \\[org-edit-src-code], the minimum (across-lines) number of
  88   leading whitespace characters are removed from all lines, and
  89   the code block is then uniformly indented according to the
  90   value of `org-edit-src-content-indentation'."
  91   :group 'org-edit-structure
  92   :type 'boolean)
  93
  94 (defcustom org-edit-src-content-indentation 2
  95   "Indentation for the content of a source code block.
  96 This should be the number of spaces added to the indentation of the #+begin
  97 line in order to compute the indentation of the block content after
  98 editing it with \\[org-edit-src-code]. Has no effect if
  99 `org-src-preserve-indentation' is non-nil."
 100   :group 'org-edit-structure
 101   :type 'integer)
 102
 103 (defcustom org-edit-src-persistent-message t
 104   "Non-nil means show persistent exit help message while editing src examples.
 105 The message is shown in the header-line, which will be created in the
 106 first line of the window showing the editing buffer.
 107 When nil, the message will only be shown intermittently in the echo area."
 108   :group 'org-edit-structure
 109   :type 'boolean)
 110
 111
 112 (defvar org-src-mode-hook nil
 113   "Hook  run after Org switched a source code snippet to its Emacs mode.
 114 This hook will run
 115
 116 - when editing a source code snippet with \"C-c '\".
 117 - When formatting a source code snippet for export with htmlize.
 118
 119 You may want to use this hook for example to turn off `outline-minor-mode'
 120 or similar things which you want to have when editing a source code file,
 121 but which mess up the display of a snippet in Org exported files.")
 122
 123 (defcustom org-src-lang-modes
 124   '(("ocaml" . tuareg) ("elisp" . emacs-lisp) ("ditaa" . artist)
 125     ("asymptote" . asy))
 126   "Alist mapping languages to their major mode.
 127 The key is the language name, the value is the string that should
 128 be inserted as the name of the major mode.  For many languages this is
 129 simple, but for language where this is not the case, this variable
 130 provides a way to simplify things on the user side.
 131 For example, there is no ocaml-mode in Emacs, but the mode to use is
 132 `tuareg-mode'."
 133   :group 'org-edit-structure
 134   :type '(repeat
 135           (cons
 136            (string "Language name")
 137            (symbol "Major mode"))))
 138
 139 ;;; Editing source examples
 140
 141 (defvar org-src-mode-map (make-sparse-keymap))
 142 (define-key org-src-mode-map "\C-c'" 'org-edit-src-exit)
 143 (defvar org-edit-src-force-single-line nil)
 144 (defvar org-edit-src-from-org-mode nil)
 145 (defvar org-edit-src-picture nil)
 146 (defvar org-edit-src-beg-marker nil)
 147 (defvar org-edit-src-end-marker nil)
 148 (defvar org-edit-src-overlay nil)
 149 (defvar org-edit-src-block-indentation nil)
 150
 151 (defvar org-src-ask-before-returning-to-edit-buffer t
 152   "If nil, when org-edit-src code is used on a block that already
 153   has an active edit buffer, it will switch to that edit buffer
 154   immediately; otherwise it will ask whether you want to return
 155   to the existing edit buffer.")
 156
 157 (define-minor-mode org-src-mode
 158   "Minor mode for language major mode buffers generated by org.
 159 This minor mode is turned on in two situations:
 160 - when editing a source code snippet with \"C-c '\".
 161 - When formatting a source code snippet for export with htmlize.
 162 There is a mode hook, and keybindings for `org-edit-src-exit' and
 163 `org-edit-src-save'")
 164
 165 (defun org-edit-src-code ()
 166   "Edit the source code example at point.
 167 The example is copied to a separate buffer, and that buffer is switched
 168 to the correct language mode.  When done, exit with \\[org-edit-src-exit].
 169 This will remove the original code in the Org buffer, and replace it with
 170 the edited version."
 171   (interactive)
 172   (let ((line (org-current-line))
 173         (col (current-column))
 174         (case-fold-search t)
 175         (msg (substitute-command-keys
 176               "Edit, then exit with C-c ' (C-c and single quote)"))
 177         (info (org-edit-src-find-region-and-lang))
 178         (org-mode-p (eq major-mode 'org-mode))
 179         (beg (make-marker))
 180         (end (make-marker))
 181         (preserve-indentation org-src-preserve-indentation)
 182         block-nindent total-nindent ovl lang lang-f single lfmt code begline buffer)
 183     (if (not info)
 184         nil
 185       (setq beg (move-marker beg (nth 0 info))
 186             end (move-marker end (nth 1 info))
 187             code (buffer-substring-no-properties beg end)
 188             lang (or (cdr (assoc (nth 2 info) org-src-lang-modes))
 189                      (nth 2 info))
 190             lang (if (symbolp lang) (symbol-name lang) lang)
 191             single (nth 3 info)
 192             lfmt (nth 4 info)
 193             block-nindent (nth 5 info)
 194             lang-f (intern (concat lang "-mode"))
 195             begline (save-excursion (goto-char beg) (org-current-line)))
 196       (unless (functionp lang-f)
 197         (error "No such language mode: %s" lang-f))
 198       (org-goto-line line)
 199       (if (and (setq buffer (org-edit-src-find-buffer beg end))
 200                org-src-ask-before-returning-to-edit-buffer
 201                (y-or-n-p "Return to existing edit buffer? [n] will revert changes: "))
 202           (switch-to-buffer buffer)
 203         (when buffer
 204           (with-current-buffer buffer
 205             (if (boundp 'org-edit-src-overlay)
 206                 (org-delete-overlay org-edit-src-overlay)))
 207           (kill-buffer buffer))
 208         (setq buffer (generate-new-buffer
 209                       (org-src-construct-edit-buffer-name (buffer-name) lang)))
 210         (setq ovl (org-make-overlay beg end))
 211         (org-overlay-put ovl 'face 'secondary-selection)
 212         (org-overlay-put ovl 'edit-buffer buffer)
 213         (org-overlay-put ovl 'help-echo "Click with mouse-1 to switch to buffer editing this segment")
 214         (org-overlay-put ovl 'face 'secondary-selection)
 215         (org-overlay-put ovl
 216                          'keymap
 217                          (let ((map (make-sparse-keymap)))
 218                            (define-key map [mouse-1] 'org-edit-src-continue)
 219                            map))
 220         (org-overlay-put ovl :read-only "Leave me alone")
 221         (switch-to-buffer buffer)
 222         (if (eq single 'macro-definition)
 223             (setq code (replace-regexp-in-string "\\\\n" "\n" code t t)))
 224         (insert code)
 225         (remove-text-properties (point-min) (point-max)
 226                                 '(display nil invisible nil intangible nil))
 227         (unless preserve-indentation
 228           (setq total-nindent (or (org-do-remove-indentation) 0)))
 229         (let ((org-inhibit-startup t))
 230           (funcall lang-f))
 231         (set (make-local-variable 'org-edit-src-force-single-line) single)
 232         (set (make-local-variable 'org-edit-src-from-org-mode) org-mode-p)
 233         (set (make-local-variable 'org-src-preserve-indentation) preserve-indentation)
 234         (when lfmt
 235           (set (make-local-variable 'org-coderef-label-format) lfmt))
 236         (when org-mode-p
 237           (goto-char (point-min))
 238           (while (re-search-forward "^," nil t)
 239             (if (eq (org-current-line) line) (setq total-nindent (1+ total-nindent)))
 240             (replace-match "")))
 241         (org-goto-line (1+ (- line begline)))
 242         (org-move-to-column
 243          (if preserve-indentation col (max 0 (- col total-nindent))))
 244         (org-set-local 'org-edit-src-beg-marker beg)
 245         (org-set-local 'org-edit-src-end-marker end)
 246         (org-set-local 'org-edit-src-overlay ovl)
 247         (org-set-local 'org-edit-src-block-indentation block-nindent)
 248         (org-src-mode)
 249         (set-buffer-modified-p nil)
 250         (and org-edit-src-persistent-message
 251              (org-set-local 'header-line-format msg)))
 252       (message "%s" msg)
 253       t)))
 254
 255 (defun org-edit-src-continue (e)
 256   (interactive "e")
 257   (mouse-set-point e)
 258   (let ((buf (get-char-property (point) 'edit-buffer)))
 259     (if buf (switch-to-buffer buf)
 260       (error "Something is wrong here"))))
 261
 262 (defun org-src-construct-edit-buffer-name (org-buffer-name lang)
 263   "Construct the buffer name for a source editing buffer"
 264   (concat "*Org Src " org-buffer-name "[ " lang " ]*"))
 265
 266 (defun org-edit-src-find-buffer (beg end)
 267   "Find a source editing buffer that is already editing the region BEG to END."
 268   (catch 'exit
 269     (mapc
 270      (lambda (b)
 271        (with-current-buffer b
 272          (if (and (string-match "\\`*Org Src " (buffer-name))
 273                   (local-variable-p 'org-edit-src-beg-marker (current-buffer))
 274                   (local-variable-p 'org-edit-src-end-marker (current-buffer))
 275                   (equal beg org-edit-src-beg-marker)
 276                   (equal end org-edit-src-end-marker))
 277              (throw 'exit (current-buffer)))))
 278      (buffer-list))
 279     nil))
 280
 281 (defun org-edit-fixed-width-region ()
 282   "Edit the fixed-width ascii drawing at point.
 283 This must be a region where each line starts with a colon followed by
 284 a space character.
 285 An new buffer is created and the fixed-width region is copied into it,
 286 and the buffer is switched into `artist-mode' for editing.  When done,
 287 exit with \\[org-edit-src-exit].  The edited text will then replace
 288 the fragment in the Org-mode buffer."
 289   (interactive)
 290   (let ((line (org-current-line))
 291         (col (current-column))
 292         (case-fold-search t)
 293         (msg (substitute-command-keys
 294               "Edit, then exit with C-c ' (C-c and single quote)"))
 295         (org-mode-p (eq major-mode 'org-mode))
 296         (beg (make-marker))
 297         (end (make-marker))
 298         (preserve-indentation org-src-preserve-indentation)
 299         block-nindent ovl beg1 end1 code begline buffer)
 300     (beginning-of-line 1)
 301     (if (looking-at "[ \t]*[^:\n \t]")
 302         nil
 303       (if (looking-at "[ \t]*\\(\n\\|\\'\\)")
 304           (setq beg1 (point) end1 beg1)
 305         (save-excursion
 306           (if (re-search-backward "^[ \t]*[^: \t]" nil 'move)
 307               (setq beg1 (point-at-bol 2))
 308             (setq beg1 (point))))
 309         (save-excursion
 310           (if (re-search-forward "^[ \t]*[^: \t]" nil 'move)
 311               (setq end1 (1- (match-beginning 0)))
 312             (setq end1 (point))))
 313         (org-goto-line line))
 314       (setq beg (move-marker beg beg1)
 315             end (move-marker end end1)
 316             code (buffer-substring-no-properties beg end)
 317             begline (save-excursion (goto-char beg) (org-current-line)))
 318       (if (and (setq buffer (org-edit-src-find-buffer beg end))
 319                (y-or-n-p "Return to existing edit buffer? [n] will revert changes: "))
 320           (switch-to-buffer buffer)
 321         (when buffer
 322           (with-current-buffer buffer
 323             (if (boundp 'org-edit-src-overlay)
 324                 (org-delete-overlay org-edit-src-overlay)))
 325           (kill-buffer buffer))
 326         (setq buffer (generate-new-buffer
 327                       (org-src-construct-edit-buffer-name
 328                        (buffer-name) "Fixed Width")))
 329         (setq ovl (org-make-overlay beg end))
 330         (org-overlay-put ovl 'face 'secondary-selection)
 331         (org-overlay-put ovl 'edit-buffer buffer)
 332         (org-overlay-put ovl 'help-echo "Click with mouse-1 to switch to buffer editing this segment")
 333         (org-overlay-put ovl 'face 'secondary-selection)
 334         (org-overlay-put ovl
 335                          'keymap
 336                          (let ((map (make-sparse-keymap)))
 337                            (define-key map [mouse-1] 'org-edit-src-continue)
 338                            map))
 339         (org-overlay-put ovl :read-only "Leave me alone")
 340         (switch-to-buffer buffer)
 341         (insert code)
 342         (remove-text-properties (point-min) (point-max)
 343                                 '(display nil invisible nil intangible nil))
 344         (setq block-nindent (or (org-do-remove-indentation) 0))
 345         (cond
 346          ((eq org-edit-fixed-width-region-mode 'artist-mode)
 347           (fundamental-mode)
 348           (artist-mode 1))
 349        (t (funcall org-edit-fixed-width-region-mode)))
 350         (set (make-local-variable 'org-edit-src-force-single-line) nil)
 351         (set (make-local-variable 'org-edit-src-from-org-mode) org-mode-p)
 352         (set (make-local-variable 'org-edit-src-picture) t)
 353         (goto-char (point-min))
 354         (while (re-search-forward "^[ \t]*: ?" nil t)
 355           (replace-match ""))
 356         (org-goto-line (1+ (- line begline)))
 357         (org-move-to-column (max 0 (- col block-nindent 2)))
 358         (org-set-local 'org-edit-src-beg-marker beg)
 359         (org-set-local 'org-edit-src-end-marker end)
 360         (org-set-local 'org-edit-src-overlay ovl)
 361         (org-set-local 'org-edit-src-block-indentation block-nindent)
 362         (org-set-local 'org-edit-src-content-indentation 0)
 363         (org-set-local 'org-src-preserve-indentation nil)
 364         (org-src-mode)
 365         (set-buffer-modified-p nil)
 366         (and org-edit-src-persistent-message
 367              (org-set-local 'header-line-format msg)))
 368       (message "%s" msg)
 369       t)))
 370
 371 (defun org-edit-src-find-region-and-lang ()
 372   "Find the region and language for a local edit.
 373 Return a list with beginning and end of the region, a string representing
 374 the language, a switch telling if the content should be in a single line."
 375   (let ((re-list
 376          (append
 377           org-edit-src-region-extra
 378           '(
 379             ("<src\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</src>" lang)
 380             ("<literal\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</literal>" style)
 381             ("<example>[ \t]*\n?" "\n?[ \t]*</example>" "fundamental")
 382             ("<lisp>[ \t]*\n?" "\n?[ \t]*</lisp>" "emacs-lisp")
 383             ("<perl>[ \t]*\n?" "\n?[ \t]*</perl>" "perl")
 384             ("<python>[ \t]*\n?" "\n?[ \t]*</python>" "python")
 385             ("<ruby>[ \t]*\n?" "\n?[ \t]*</ruby>" "ruby")
 386             ("^[ \t]*#\\+begin_src\\( \\([^ \t\n]+\\)\\)?.*\n" "\n[ \t]*#\\+end_src" 2)
 387             ("^[ \t]*#\\+begin_example.*\n" "\n[ \t]*#\\+end_example" "fundamental")
 388             ("^[ \t]*#\\+html:" "\n" "html" single-line)
 389             ("^[ \t]*#\\+begin_html.*\n" "\n[ \t]*#\\+end_html" "html")
 390             ("^[ \t]*#\\+latex:" "\n" "latex" single-line)
 391             ("^[ \t]*#\\+begin_latex.*\n" "\n[ \t]*#\\+end_latex" "latex")
 392             ("^[ \t]*#\\+ascii:" "\n" "fundamental" single-line)
 393             ("^[ \t]*#\\+begin_ascii.*\n" "\n[ \t]*#\\+end_ascii" "fundamental")
 394             ("^[ \t]*#\\+docbook:" "\n" "xml" single-line)
 395             ("^[ \t]*#\\+macro:[ \t]+\\S-+\\( \\|$\\)"
 396              "\n" "fundamental" macro-definition)
 397             ("^[ \t]*#\\+begin_docbook.*\n" "\n[ \t]*#\\+end_docbook" "xml")
 398             )))
 399         (pos (point))
 400         re1 re2 single beg end lang lfmt match-re1 ind entry)
 401     (catch 'exit
 402       (while (setq entry (pop re-list))
 403         (setq re1 (car entry) re2 (nth 1 entry) lang (nth 2 entry)
 404               single (nth 3 entry))
 405         (save-excursion
 406           (if (or (looking-at re1)
 407                   (re-search-backward re1 nil t))
 408               (progn
 409                 (setq match-re1 (match-string 0))
 410                 (setq beg (match-end 0)
 411                       lang (org-edit-src-get-lang lang)
 412                       lfmt (org-edit-src-get-label-format match-re1)
 413                       ind (org-edit-src-get-indentation (match-beginning 0)))
 414                 (if (and (re-search-forward re2 nil t)
 415                          (>= (match-end 0) pos))
 416                     (throw 'exit (list beg (match-beginning 0)
 417                                        lang single lfmt ind))))
 418             (if (or (looking-at re2)
 419                     (re-search-forward re2 nil t))
 420                 (progn
 421                   (setq end (match-beginning 0))
 422                   (if (and (re-search-backward re1 nil t)
 423                            (<= (match-beginning 0) pos))
 424                       (progn
 425                         (setq lfmt (org-edit-src-get-label-format
 426                                     (match-string 0))
 427                               ind (org-edit-src-get-indentation
 428                                    (match-beginning 0)))
 429                         (throw 'exit
 430                                (list (match-end 0) end
 431                                      (org-edit-src-get-lang lang)
 432                                      single lfmt ind))))))))))))
 433
 434 (defun org-edit-src-get-lang (lang)
 435   "Extract the src language."
 436   (let ((m (match-string 0)))
 437     (cond
 438      ((stringp lang) lang)
 439      ((integerp lang) (match-string lang))
 440      ((and (eq lang 'lang)
 441            (string-match "\\<lang=\"\\([^ \t\n\"]+\\)\"" m))
 442       (match-string 1 m))
 443      ((and (eq lang 'style)
 444            (string-match "\\<style=\"\\([^ \t\n\"]+\\)\"" m))
 445       (match-string 1 m))
 446      (t "fundamental"))))
 447
 448 (defun org-edit-src-get-label-format (s)
 449   "Extract the label format."
 450   (save-match-data
 451     (if (string-match "-l[ \t]+\\\\?\"\\([^\t\r\n\"]+\\)\\\\?\"" s)
 452         (match-string 1 s))))
 453
 454 (defun org-edit-src-get-indentation (pos)
 455   "Count leading whitespace characters on line"
 456   (save-match-data
 457     (goto-char pos)
 458     (org-get-indentation)))
 459
 460 (defun org-edit-src-exit ()
 461   "Exit special edit and protect problematic lines."
 462   (interactive)
 463   (unless org-edit-src-from-org-mode
 464     (error "This is not a sub-editing buffer, something is wrong..."))
 465   (let* ((beg org-edit-src-beg-marker)
 466          (end org-edit-src-end-marker)
 467          (ovl org-edit-src-overlay)
 468          (buffer (current-buffer))
 469          (single (org-bound-and-true-p org-edit-src-force-single-line))
 470          (macro (eq single 'macro-definition))
 471          (total-nindent (+ (or org-edit-src-block-indentation 0)
 472                            org-edit-src-content-indentation))
 473          (preserve-indentation org-src-preserve-indentation)
 474          (delta 0) code line col indent)
 475     (untabify (point-min) (point-max))
 476     (save-excursion
 477       (goto-char (point-min))
 478       (if (looking-at "[ \t\n]*\n") (replace-match ""))
 479       (unless macro
 480         (if (re-search-forward "\n[ \t\n]*\\'" nil t) (replace-match ""))))
 481     (setq line (if (org-bound-and-true-p org-edit-src-force-single-line)
 482                    1
 483                  (org-current-line))
 484           col (current-column))
 485     (when single
 486       (goto-char (point-min))
 487       (if (re-search-forward "\\s-+\\'" nil t) (replace-match ""))
 488       (goto-char (point-min))
 489       (let ((cnt 0))
 490         (while (re-search-forward "\n" nil t)
 491           (setq cnt (1+ cnt))
 492           (replace-match (if macro "\\n" " ") t t))
 493         (when (and macro (> cnt 0))
 494           (goto-char (point-max)) (insert "\\n")))
 495       (goto-char (point-min))
 496       (if (looking-at "\\s-*") (replace-match " ")))
 497     (when (org-bound-and-true-p org-edit-src-from-org-mode)
 498       (goto-char (point-min))
 499       (while (re-search-forward
 500               (if (org-mode-p) "^\\(.\\)" "^\\([*]\\|[ \t]*#\\+\\)") nil t)
 501         (if (eq (org-current-line) line) (setq delta (1+ delta)))
 502         (replace-match ",\\1")))
 503     (when (org-bound-and-true-p org-edit-src-picture)
 504       (setq preserve-indentation nil)
 505       (untabify (point-min) (point-max))
 506       (goto-char (point-min))
 507       (while (re-search-forward "^" nil t)
 508         (replace-match ": ")))
 509     (unless (or single preserve-indentation (= total-nindent 0))
 510       (setq indent (make-string total-nindent ?\ ))
 511       (goto-char (point-min))
 512       (while (re-search-forward "^" nil t)
 513         (replace-match indent)))
 514     (if (org-bound-and-true-p org-edit-src-picture)
 515         (setq total-nindent (+ total-nindent 2)))
 516     (setq code (buffer-string))
 517     (set-buffer-modified-p nil)
 518     (switch-to-buffer (marker-buffer beg))
 519     (kill-buffer buffer)
 520     (goto-char beg)
 521     (delete-region beg end)
 522     (insert code)
 523     (goto-char beg)
 524     (if single (just-one-space))
 525     (org-goto-line (1- (+ (org-current-line) line)))
 526     (org-move-to-column (if preserve-indentation col (+ col total-nindent delta)))
 527     (move-marker beg nil)
 528     (move-marker end nil)))
 529
 530 (defun org-edit-src-save ()
 531   "Save parent buffer with current state source-code buffer."
 532   (interactive)
 533   (save-window-excursion
 534     (let ((p (point)) (m (mark)) msg)
 535       (org-edit-src-exit)
 536       (save-buffer)
 537       (setq msg (current-message))
 538       (org-edit-src-code)
 539       (push-mark m 'nomessage)
 540       (goto-char (min p (point-max)))
 541       (message (or msg "")))))
 542
 543 (defun org-src-mode-configure-edit-buffer ()
 544   (when org-edit-src-from-org-mode
 545     (setq buffer-offer-save t)
 546     (setq buffer-file-name
 547           (concat (buffer-file-name (marker-buffer org-edit-src-beg-marker))
 548                   "[" (buffer-name) "]"))
 549     (set (if (featurep 'xemacs) 'write-contents-hooks 'write-contents-functions)
 550          '(org-edit-src-save))
 551     (org-add-hook 'kill-buffer-hook
 552                   '(lambda () (org-delete-overlay org-edit-src-overlay)) nil 'local)))
 553
 554 (org-add-hook 'org-src-mode-hook 'org-src-mode-configure-edit-buffer)
 555
 556 (provide 'org-src)
 557
 558 ;; arch-tag: 6a1fc84f-dec7-47be-a416-64be56bea5d8
 559 ;;; org-src.el ends here