lisp/org-src.el

   1 ;;; org-src.el --- Source code examples in Org
   2 ;;
   3 ;; Copyright (C) 2004-2011 Free Software Foundation, Inc.
   4 ;;
   5 ;; Author: Carsten Dominik <carsten at orgmode dot org>
   6 ;;         Bastien Guerry <bzg AT gnu DOT org>
   7 ;;         Dan Davison <davison at stats dot ox dot ac dot uk>
   8 ;; Keywords: outlines, hypermedia, calendar, wp
   9 ;; Homepage: http://orgmode.org
  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 the code dealing with source code examples in Org-mode.
  30
  31 ;;; Code:
  32
  33 (require 'org-macs)
  34 (require 'org-compat)
  35 (require 'ob-keys)
  36 (require 'ob-comint)
  37 (eval-when-compile
  38   (require 'cl))
  39
  40 (declare-function org-do-remove-indentation "org" (&optional n))
  41 (declare-function org-at-table.el-p "org" ())
  42 (declare-function org-get-indentation "org" (&optional line))
  43 (declare-function org-switch-to-buffer-other-window "org" (&rest args))
  44 (declare-function org-pop-to-buffer-same-window
  45                   "org-compat" (&optional buffer-or-name norecord label))
  46
  47 (defcustom org-edit-src-region-extra nil
  48   "Additional regexps to identify regions for editing with `org-edit-src-code'.
  49 For examples see the function `org-edit-src-find-region-and-lang'.
  50 The regular expression identifying the begin marker should end with a newline,
  51 and the regexp marking the end line should start with a newline, to make sure
  52 there are kept outside the narrowed region."
  53   :group 'org-edit-structure
  54   :type '(repeat
  55           (list
  56            (regexp :tag "begin regexp")
  57            (regexp :tag "end regexp")
  58            (choice :tag "language"
  59                    (string :tag "specify")
  60                    (integer :tag "from match group")
  61                    (const :tag "from `lang' element")
  62                    (const :tag "from `style' element")))))
  63
  64 (defcustom org-coderef-label-format "(ref:%s)"
  65   "The default coderef format.
  66 This format string will be used to search for coderef labels in literal
  67 examples (EXAMPLE and SRC blocks).  The format can be overwritten in
  68 an individual literal example with the -l option, like
  69
  70 #+BEGIN_SRC pascal +n -r -l \"((%s))\"
  71 ...
  72 #+END_SRC
  73
  74 If you want to use this for HTML export, make sure that the format does
  75 not introduce special font-locking, and avoid the HTML special
  76 characters `<', `>', and `&'.  The reason for this restriction is that
  77 the labels are searched for only after htmlize has done its job."
  78   :group 'org-edit-structure ; FIXME this is not in the right group
  79   :type 'string)
  80
  81 (defcustom org-edit-fixed-width-region-mode 'artist-mode
  82   "The mode that should be used to edit fixed-width regions.
  83 These are the regions where each line starts with a colon."
  84   :group 'org-edit-structure
  85   :type '(choice
  86           (const artist-mode)
  87           (const picture-mode)
  88           (const fundamental-mode)
  89           (function :tag "Other (specify)")))
  90
  91 (defcustom org-src-preserve-indentation nil
  92   "If non-nil preserve leading whitespace characters on export.
  93 If non-nil leading whitespace characters in source code blocks
  94 are preserved on export, and when switching between the org
  95 buffer and the language mode edit buffer.  If this variable is nil
  96 then, after editing with \\[org-edit-src-code], the
  97 minimum (across-lines) number of leading whitespace characters
  98 are removed from all lines, and the code block is uniformly
  99 indented according to the value of `org-edit-src-content-indentation'."
 100   :group 'org-edit-structure
 101   :type 'boolean)
 102
 103 (defcustom org-edit-src-content-indentation 2
 104   "Indentation for the content of a source code block.
 105 This should be the number of spaces added to the indentation of the #+begin
 106 line in order to compute the indentation of the block content after
 107 editing it with \\[org-edit-src-code].  Has no effect if
 108 `org-src-preserve-indentation' is non-nil."
 109   :group 'org-edit-structure
 110   :type 'integer)
 111
 112 (defvar org-src-strip-leading-and-trailing-blank-lines nil
 113   "If non-nil, blank lines are removed when exiting the code edit
 114 buffer.")
 115
 116 (defcustom org-edit-src-persistent-message t
 117   "Non-nil means show persistent exit help message while editing src examples.
 118 The message is shown in the header-line, which will be created in the
 119 first line of the window showing the editing buffer."
 120   :group 'org-edit-structure
 121   :type 'boolean)
 122
 123 (defcustom org-src-window-setup 'reorganize-frame
 124   "How the source code edit buffer should be displayed.
 125 Possible values for this option are:
 126
 127 current-window    Show edit buffer in the current window, keeping all other
 128                   windows.
 129 other-window      Use `switch-to-buffer-other-window' to display edit buffer.
 130 reorganize-frame  Show only two windows on the current frame, the current
 131                   window and the edit buffer. When exiting the edit buffer,
 132                   return to one window.
 133 other-frame       Use `switch-to-buffer-other-frame' to display edit buffer.
 134                   Also, when exiting the edit buffer, kill that frame."
 135   :group 'org-edit-structure
 136   :type '(choice
 137           (const current-window)
 138           (const other-frame)
 139           (const other-window)
 140           (const reorganize-frame)))
 141
 142 (defvar org-src-mode-hook nil
 143   "Hook  run after Org switched a source code snippet to its Emacs mode.
 144 This hook will run
 145
 146 - when editing a source code snippet with \"C-c '\".
 147 - When formatting a source code snippet for export with htmlize.
 148
 149 You may want to use this hook for example to turn off `outline-minor-mode'
 150 or similar things which you want to have when editing a source code file,
 151 but which mess up the display of a snippet in Org exported files.")
 152
 153 (defcustom org-src-lang-modes
 154   '(("ocaml" . tuareg) ("elisp" . emacs-lisp) ("ditaa" . artist)
 155     ("asymptote" . asy) ("dot" . fundamental) ("sqlite" . sql)
 156     ("calc" . fundamental) ("C" . c) ("cpp" . c++))
 157   "Alist mapping languages to their major mode.
 158 The key is the language name, the value is the string that should
 159 be inserted as the name of the major mode.  For many languages this is
 160 simple, but for language where this is not the case, this variable
 161 provides a way to simplify things on the user side.
 162 For example, there is no ocaml-mode in Emacs, but the mode to use is
 163 `tuareg-mode'."
 164   :group 'org-edit-structure
 165   :type '(repeat
 166           (cons
 167            (string "Language name")
 168            (symbol "Major mode"))))
 169
 170 ;;; Editing source examples
 171
 172 (defvar org-src-mode-map (make-sparse-keymap))
 173 (define-key org-src-mode-map "\C-c'" 'org-edit-src-exit)
 174
 175 (defvar org-edit-src-force-single-line nil)
 176 (defvar org-edit-src-from-org-mode nil)
 177 (defvar org-edit-src-allow-write-back-p t)
 178 (defvar org-edit-src-picture nil)
 179 (defvar org-edit-src-beg-marker nil)
 180 (defvar org-edit-src-end-marker nil)
 181 (defvar org-edit-src-overlay nil)
 182 (defvar org-edit-src-block-indentation nil)
 183 (defvar org-edit-src-saved-temp-window-config nil)
 184
 185 (defvar org-src-ask-before-returning-to-edit-buffer t
 186   "If nil, when org-edit-src code is used on a block that already
 187   has an active edit buffer, it will switch to that edit buffer
 188   immediately; otherwise it will ask whether you want to return
 189   to the existing edit buffer.")
 190
 191 (defvar org-src-babel-info nil)
 192
 193 (define-minor-mode org-src-mode
 194   "Minor mode for language major mode buffers generated by org.
 195 This minor mode is turned on in two situations:
 196 - when editing a source code snippet with \"C-c '\".
 197 - When formatting a source code snippet for export with htmlize.
 198 There is a mode hook, and keybindings for `org-edit-src-exit' and
 199 `org-edit-src-save'")
 200
 201 (defun org-edit-src-code (&optional context code edit-buffer-name)
 202   "Edit the source code example at point.
 203 The example is copied to a separate buffer, and that buffer is
 204 switched to the correct language mode.  When done, exit with
 205 \\[org-edit-src-exit].  This will remove the original code in the
 206 Org buffer, and replace it with the edited version. Optional
 207 argument CONTEXT is used by \\[org-edit-src-save] when calling
 208 this function. See \\[org-src-window-setup] to configure the
 209 display of windows containing the Org buffer and the code
 210 buffer."
 211   (interactive)
 212   (unless (eq context 'save)
 213     (setq org-edit-src-saved-temp-window-config (current-window-configuration)))
 214   (let ((mark (and (org-region-active-p) (mark)))
 215         (case-fold-search t)
 216         (info (org-edit-src-find-region-and-lang))
 217         (full-info (org-babel-get-src-block-info))
 218         (org-mode-p (or (org-mode-p) (derived-mode-p 'org-mode)))
 219         (beg (make-marker))
 220         (end (make-marker))
 221         (allow-write-back-p (null code))
 222         block-nindent total-nindent ovl lang lang-f single lfmt buffer msg
 223         begline markline markcol line col transmitted-variables)
 224     (if (not info)
 225         nil
 226       (setq beg (move-marker beg (nth 0 info))
 227             end (move-marker end (nth 1 info))
 228             msg (if allow-write-back-p
 229                     (substitute-command-keys
 230                      "Edit, then exit with C-c ' (C-c and single quote)")
 231                   "Exit with C-c ' (C-c and single quote)")
 232             code (or code (buffer-substring-no-properties beg end))
 233             lang (or (cdr (assoc (nth 2 info) org-src-lang-modes))
 234                      (nth 2 info))
 235             lang (if (symbolp lang) (symbol-name lang) lang)
 236             single (nth 3 info)
 237             block-nindent (nth 5 info)
 238             lang-f (intern (concat lang "-mode"))
 239             begline (save-excursion (goto-char beg) (org-current-line))
 240             transmitted-variables
 241             `((org-edit-src-content-indentation
 242                ,org-edit-src-content-indentation)
 243               (org-edit-src-force-single-line ,single)
 244               (org-edit-src-from-org-mode ,org-mode-p)
 245               (org-edit-src-allow-write-back-p ,allow-write-back-p)
 246               (org-src-preserve-indentation ,org-src-preserve-indentation)
 247               (org-src-babel-info ,(org-babel-get-src-block-info 'light))
 248               (org-coderef-label-format
 249                ,(or (nth 4 info) org-coderef-label-format))
 250               (org-edit-src-beg-marker ,beg)
 251               (org-edit-src-end-marker ,end)
 252               (org-edit-src-block-indentation ,block-nindent)))
 253       (if (and mark (>= mark beg) (<= mark (1+ end)))
 254           (save-excursion (goto-char (min mark end))
 255                           (setq markline (org-current-line)
 256                                 markcol (current-column))))
 257       (if (equal lang-f 'table.el-mode)
 258           (setq lang-f (lambda ()
 259                          (text-mode)
 260                          (if (org-bound-and-true-p flyspell-mode)
 261                              (flyspell-mode -1))
 262                          (table-recognize)
 263                          (org-set-local 'org-edit-src-content-indentation 0))))
 264       (unless (functionp lang-f)
 265         (error "No such language mode: %s" lang-f))
 266       (save-excursion
 267         (if (> (point) end) (goto-char end))
 268         (setq line (org-current-line)
 269               col (current-column)))
 270       (if (and (setq buffer (org-edit-src-find-buffer beg end))
 271                (if org-src-ask-before-returning-to-edit-buffer
 272                    (y-or-n-p "Return to existing edit buffer? [n] will revert changes: ") t))
 273           (org-src-switch-to-buffer buffer 'return)
 274         (when buffer
 275           (with-current-buffer buffer
 276             (if (boundp 'org-edit-src-overlay)
 277                 (delete-overlay org-edit-src-overlay)))
 278           (kill-buffer buffer))
 279         (setq buffer (generate-new-buffer
 280                       (or edit-buffer-name
 281                           (org-src-construct-edit-buffer-name (buffer-name) lang))))
 282         (setq ovl (make-overlay beg end))
 283         (overlay-put ovl 'edit-buffer buffer)
 284         (overlay-put ovl 'help-echo "Click with mouse-1 to switch to buffer editing this segment")
 285         (overlay-put ovl 'face 'secondary-selection)
 286         (overlay-put ovl
 287                      'keymap
 288                      (let ((map (make-sparse-keymap)))
 289                        (define-key map [mouse-1] 'org-edit-src-continue)
 290                        map))
 291         (overlay-put ovl :read-only "Leave me alone")
 292         (setq transmitted-variables
 293               (append transmitted-variables `((org-edit-src-overlay ,ovl))))
 294         (org-src-switch-to-buffer buffer 'edit)
 295         (if (eq single 'macro-definition)
 296             (setq code (replace-regexp-in-string "\\\\n" "\n" code t t)))
 297         (insert code)
 298         (remove-text-properties (point-min) (point-max)
 299                                 '(display nil invisible nil intangible nil))
 300         (unless (cadr (assq 'org-src-preserve-indentation transmitted-variables))
 301           (setq total-nindent (or (org-do-remove-indentation) 0)))
 302         (let ((org-inhibit-startup t))
 303           (condition-case e
 304               (funcall lang-f)
 305             (error
 306              (error "Language mode `%s' fails with: %S" lang-f (nth 1 e)))))
 307         (dolist (pair transmitted-variables)
 308           (org-set-local (car pair) (cadr pair)))
 309         (when org-mode-p
 310           (goto-char (point-min))
 311           (while (re-search-forward "^," nil t)
 312             (if (eq (org-current-line) line) (setq total-nindent (1+ total-nindent)))
 313             (replace-match "")))
 314         (when markline
 315           (org-goto-line (1+ (- markline begline)))
 316           (org-move-to-column
 317            (if org-src-preserve-indentation markcol
 318              (max 0 (- markcol total-nindent))))
 319           (push-mark (point) 'no-message t)
 320           (setq deactivate-mark nil))
 321         (org-goto-line (1+ (- line begline)))
 322         (org-move-to-column
 323          (if org-src-preserve-indentation col (max 0 (- col total-nindent))))
 324         (org-src-mode)
 325         (set-buffer-modified-p nil)
 326         (and org-edit-src-persistent-message
 327              (org-set-local 'header-line-format msg))
 328         (let ((edit-prep-func (intern (concat "org-babel-edit-prep:" lang))))
 329           (when (fboundp edit-prep-func)
 330             (funcall edit-prep-func full-info))))
 331       t)))
 332
 333 (defun org-edit-src-continue (e)
 334   (interactive "e")
 335   (mouse-set-point e)
 336   (let ((buf (get-char-property (point) 'edit-buffer)))
 337     (if buf (org-src-switch-to-buffer buf 'continue)
 338       (error "Something is wrong here"))))
 339
 340 (defun org-src-switch-to-buffer (buffer context)
 341   (case org-src-window-setup
 342     ('current-window
 343      (org-pop-to-buffer-same-window buffer))
 344     ('other-window
 345      (switch-to-buffer-other-window buffer))
 346     ('other-frame
 347      (case context
 348        ('exit
 349         (let ((frame (selected-frame)))
 350           (switch-to-buffer-other-frame buffer)
 351           (delete-frame frame)))
 352        ('save
 353         (kill-buffer (current-buffer))
 354         (org-pop-to-buffer-same-window buffer))
 355        (t
 356         (switch-to-buffer-other-frame buffer))))
 357     ('reorganize-frame
 358      (if (eq context 'edit) (delete-other-windows))
 359      (org-switch-to-buffer-other-window buffer)
 360      (if (eq context 'exit) (delete-other-windows)))
 361     ('switch-invisibly
 362      (set-buffer buffer))
 363     (t
 364      (message "Invalid value %s for org-src-window-setup"
 365               (symbol-name org-src-window-setup))
 366      (org-pop-to-buffer-same-window buffer))))
 367
 368 (defun org-src-construct-edit-buffer-name (org-buffer-name lang)
 369   "Construct the buffer name for a source editing buffer."
 370   (concat "*Org Src " org-buffer-name "[ " lang " ]*"))
 371
 372 (defun org-edit-src-find-buffer (beg end)
 373   "Find a source editing buffer that is already editing the region BEG to END."
 374   (catch 'exit
 375     (mapc
 376      (lambda (b)
 377        (with-current-buffer b
 378          (if (and (string-match "\\`*Org Src " (buffer-name))
 379                   (local-variable-p 'org-edit-src-beg-marker (current-buffer))
 380                   (local-variable-p 'org-edit-src-end-marker (current-buffer))
 381                   (equal beg org-edit-src-beg-marker)
 382                   (equal end org-edit-src-end-marker))
 383              (throw 'exit (current-buffer)))))
 384      (buffer-list))
 385     nil))
 386
 387 (defun org-edit-fixed-width-region ()
 388   "Edit the fixed-width ascii drawing at point.
 389 This must be a region where each line starts with a colon followed by
 390 a space character.
 391 An new buffer is created and the fixed-width region is copied into it,
 392 and the buffer is switched into `artist-mode' for editing.  When done,
 393 exit with \\[org-edit-src-exit].  The edited text will then replace
 394 the fragment in the Org-mode buffer."
 395   (interactive)
 396   (let ((line (org-current-line))
 397         (col (current-column))
 398         (case-fold-search t)
 399         (msg (substitute-command-keys
 400               "Edit, then exit with C-c ' (C-c and single quote)"))
 401         (org-mode-p (org-mode-p))
 402         (beg (make-marker))
 403         (end (make-marker))
 404         (preserve-indentation org-src-preserve-indentation)
 405         block-nindent ovl beg1 end1 code begline buffer)
 406     (beginning-of-line 1)
 407     (if (looking-at "[ \t]*[^:\n \t]")
 408         nil
 409       (if (looking-at "[ \t]*\\(\n\\|\\'\\)")
 410           (setq beg1 (point) end1 beg1)
 411         (save-excursion
 412           (if (re-search-backward "^[ \t]*[^: \t]" nil 'move)
 413               (setq beg1 (point-at-bol 2))
 414             (setq beg1 (point))))
 415         (save-excursion
 416           (if (re-search-forward "^[ \t]*[^: \t]" nil 'move)
 417               (setq end1 (1- (match-beginning 0)))
 418             (setq end1 (point))))
 419         (org-goto-line line))
 420       (setq beg (move-marker beg beg1)
 421             end (move-marker end end1)
 422             code (buffer-substring-no-properties beg end)
 423             begline (save-excursion (goto-char beg) (org-current-line)))
 424       (if (and (setq buffer (org-edit-src-find-buffer beg end))
 425                (y-or-n-p "Return to existing edit buffer? [n] will revert changes: "))
 426           (org-pop-to-buffer-same-window buffer)
 427         (when buffer
 428           (with-current-buffer buffer
 429             (if (boundp 'org-edit-src-overlay)
 430                 (delete-overlay org-edit-src-overlay)))
 431           (kill-buffer buffer))
 432         (setq buffer (generate-new-buffer
 433                       (org-src-construct-edit-buffer-name
 434                        (buffer-name) "Fixed Width")))
 435         (setq ovl (make-overlay beg end))
 436         (overlay-put ovl 'face 'secondary-selection)
 437         (overlay-put ovl 'edit-buffer buffer)
 438         (overlay-put ovl 'help-echo "Click with mouse-1 to switch to buffer editing this segment")
 439         (overlay-put ovl 'face 'secondary-selection)
 440         (overlay-put ovl
 441                          'keymap
 442                          (let ((map (make-sparse-keymap)))
 443                            (define-key map [mouse-1] 'org-edit-src-continue)
 444                            map))
 445         (overlay-put ovl :read-only "Leave me alone")
 446         (org-pop-to-buffer-same-window buffer)
 447         (insert code)
 448         (remove-text-properties (point-min) (point-max)
 449                                 '(display nil invisible nil intangible nil))
 450         (setq block-nindent (or (org-do-remove-indentation) 0))
 451         (cond
 452          ((eq org-edit-fixed-width-region-mode 'artist-mode)
 453           (fundamental-mode)
 454           (artist-mode 1))
 455          (t (funcall org-edit-fixed-width-region-mode)))
 456         (set (make-local-variable 'org-edit-src-force-single-line) nil)
 457         (set (make-local-variable 'org-edit-src-from-org-mode) org-mode-p)
 458         (set (make-local-variable 'org-edit-src-picture) t)
 459         (goto-char (point-min))
 460         (while (re-search-forward "^[ \t]*: ?" nil t)
 461           (replace-match ""))
 462         (org-goto-line (1+ (- line begline)))
 463         (org-move-to-column (max 0 (- col block-nindent 2)))
 464         (org-set-local 'org-edit-src-beg-marker beg)
 465         (org-set-local 'org-edit-src-end-marker end)
 466         (org-set-local 'org-edit-src-overlay ovl)
 467         (org-set-local 'org-edit-src-block-indentation block-nindent)
 468         (org-set-local 'org-edit-src-content-indentation 0)
 469         (org-set-local 'org-src-preserve-indentation nil)
 470         (org-src-mode)
 471         (set-buffer-modified-p nil)
 472         (and org-edit-src-persistent-message
 473              (org-set-local 'header-line-format msg)))
 474       (message "%s" msg)
 475       t)))
 476
 477 (defun org-edit-src-find-region-and-lang ()
 478   "Find the region and language for a local edit.
 479 Return a list with beginning and end of the region, a string representing
 480 the language, a switch telling if the content should be in a single line."
 481   (let ((re-list
 482          (append
 483           org-edit-src-region-extra
 484           '(
 485             ("<src\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</src>" lang)
 486             ("<literal\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</literal>" style)
 487             ("<example>[ \t]*\n?" "\n?[ \t]*</example>" "fundamental")
 488             ("<lisp>[ \t]*\n?" "\n?[ \t]*</lisp>" "emacs-lisp")
 489             ("<perl>[ \t]*\n?" "\n?[ \t]*</perl>" "perl")
 490             ("<python>[ \t]*\n?" "\n?[ \t]*</python>" "python")
 491             ("<ruby>[ \t]*\n?" "\n?[ \t]*</ruby>" "ruby")
 492             ("^[ \t]*#\\+begin_src\\( \\([^ \t\n]+\\)\\)?.*\n" "\n[ \t]*#\\+end_src" 2)
 493             ("^[ \t]*#\\+begin_example.*\n" "\n[ \t]*#\\+end_example" "fundamental")
 494             ("^[ \t]*#\\+html:" "\n" "html" single-line)
 495             ("^[ \t]*#\\+begin_html.*\n" "\n[ \t]*#\\+end_html" "html")
 496             ("^[ \t]*#\\+latex:" "\n" "latex" single-line)
 497             ("^[ \t]*#\\+begin_latex.*\n" "\n[ \t]*#\\+end_latex" "latex")
 498             ("^[ \t]*#\\+ascii:" "\n" "fundamental" single-line)
 499             ("^[ \t]*#\\+begin_ascii.*\n" "\n[ \t]*#\\+end_ascii" "fundamental")
 500             ("^[ \t]*#\\+docbook:" "\n" "xml" single-line)
 501             ("^[ \t]*#\\+macro:[ \t]+\\S-+\\( \\|$\\)"
 502              "\n" "fundamental" macro-definition)
 503             ("^[ \t]*#\\+begin_docbook.*\n" "\n[ \t]*#\\+end_docbook" "xml")
 504             )))
 505         (pos (point))
 506         re1 re2 single beg end lang lfmt match-re1 ind entry)
 507     (catch 'exit
 508       (while (setq entry (pop re-list))
 509         (setq re1 (car entry) re2 (nth 1 entry) lang (nth 2 entry)
 510               single (nth 3 entry))
 511         (save-excursion
 512           (if (or (looking-at re1)
 513                   (re-search-backward re1 nil t))
 514               (progn
 515                 (setq match-re1 (match-string 0))
 516                 (setq beg (match-end 0)
 517                       lang (org-edit-src-get-lang lang)
 518                       lfmt (org-edit-src-get-label-format match-re1)
 519                       ind (org-edit-src-get-indentation (match-beginning 0)))
 520                 (if (and (re-search-forward re2 nil t)
 521                          (>= (match-end 0) pos))
 522                     (throw 'exit (list beg (match-beginning 0)
 523                                        lang single lfmt ind))))
 524             (if (or (looking-at re2)
 525                     (re-search-forward re2 nil t))
 526                 (progn
 527                   (setq end (match-beginning 0))
 528                   (if (and (re-search-backward re1 nil t)
 529                            (<= (match-beginning 0) pos))
 530                       (progn
 531                         (setq lfmt (org-edit-src-get-label-format
 532                                     (match-string 0))
 533                               ind (org-edit-src-get-indentation
 534                                    (match-beginning 0)))
 535                         (throw 'exit
 536                                (list (match-end 0) end
 537                                      (org-edit-src-get-lang lang)
 538                                      single lfmt ind)))))))))
 539       (when (org-at-table.el-p)
 540         (re-search-backward "^[\t]*[^ \t|\\+]" nil t)
 541         (setq beg (1+ (point-at-eol)))
 542         (goto-char beg)
 543         (or (re-search-forward "^[\t]*[^ \t|\\+]" nil t)
 544             (progn (goto-char (point-max)) (newline)))
 545         (setq end (point-at-bol))
 546         (setq ind (org-edit-src-get-indentation beg))
 547         (throw 'exit (list beg end 'table.el nil nil ind))))))
 548
 549 (defun org-edit-src-get-lang (lang)
 550   "Extract the src language."
 551   (let ((m (match-string 0)))
 552     (cond
 553      ((stringp lang) lang)
 554      ((integerp lang) (match-string lang))
 555      ((and (eq lang 'lang)
 556            (string-match "\\<lang=\"\\([^ \t\n\"]+\\)\"" m))
 557       (match-string 1 m))
 558      ((and (eq lang 'style)
 559            (string-match "\\<style=\"\\([^ \t\n\"]+\\)\"" m))
 560       (match-string 1 m))
 561      (t "fundamental"))))
 562
 563 (defun org-edit-src-get-label-format (s)
 564   "Extract the label format."
 565   (save-match-data
 566     (if (string-match "-l[ \t]+\\\\?\"\\([^\t\r\n\"]+\\)\\\\?\"" s)
 567         (match-string 1 s))))
 568
 569 (defun org-edit-src-get-indentation (pos)
 570   "Count leading whitespace characters on line."
 571   (save-match-data
 572     (goto-char pos)
 573     (org-get-indentation)))
 574
 575 (defun org-edit-src-exit (&optional context)
 576   "Exit special edit and protect problematic lines."
 577   (interactive)
 578   (unless (org-bound-and-true-p org-edit-src-from-org-mode)
 579     (error "This is not a sub-editing buffer, something is wrong"))
 580   (widen)
 581   (let* ((beg org-edit-src-beg-marker)
 582          (end org-edit-src-end-marker)
 583          (ovl org-edit-src-overlay)
 584          (buffer (current-buffer))
 585          (single (org-bound-and-true-p org-edit-src-force-single-line))
 586          (macro (eq single 'macro-definition))
 587          (total-nindent (+ (or org-edit-src-block-indentation 0)
 588                            org-edit-src-content-indentation))
 589          (preserve-indentation org-src-preserve-indentation)
 590          (allow-write-back-p (org-bound-and-true-p org-edit-src-allow-write-back-p))
 591          (delta 0) code line col indent)
 592     (when allow-write-back-p
 593       (unless preserve-indentation (untabify (point-min) (point-max)))
 594       (if org-src-strip-leading-and-trailing-blank-lines
 595           (save-excursion
 596             (goto-char (point-min))
 597             (if (looking-at "[ \t\n]*\n") (replace-match ""))
 598             (unless macro
 599               (if (re-search-forward "\n[ \t\n]*\\'" nil t) (replace-match ""))))))
 600     (setq line (if (org-bound-and-true-p org-edit-src-force-single-line)
 601                    1
 602                  (org-current-line))
 603           col (current-column))
 604     (when allow-write-back-p
 605       (when single
 606         (goto-char (point-min))
 607         (if (re-search-forward "\\s-+\\'" nil t) (replace-match ""))
 608         (goto-char (point-min))
 609         (let ((cnt 0))
 610           (while (re-search-forward "\n" nil t)
 611             (setq cnt (1+ cnt))
 612             (replace-match (if macro "\\n" " ") t t))
 613           (when (and macro (> cnt 0))
 614             (goto-char (point-max)) (insert "\\n")))
 615         (goto-char (point-min))
 616         (if (looking-at "\\s-*") (replace-match " ")))
 617       (when (org-bound-and-true-p org-edit-src-from-org-mode)
 618         (goto-char (point-min))
 619         (while (re-search-forward
 620                 (if (org-mode-p) "^\\(.\\)" "^\\([*]\\|[ \t]*#\\+\\)") nil t)
 621           (if (eq (org-current-line) line) (setq delta (1+ delta)))
 622           (replace-match ",\\1")))
 623       (when (org-bound-and-true-p org-edit-src-picture)
 624         (setq preserve-indentation nil)
 625         (untabify (point-min) (point-max))
 626         (goto-char (point-min))
 627         (while (re-search-forward "^" nil t)
 628           (replace-match ": ")))
 629       (unless (or single preserve-indentation (= total-nindent 0))
 630         (setq indent (make-string total-nindent ?\ ))
 631         (goto-char (point-min))
 632         (while (re-search-forward "^" nil t)
 633           (replace-match indent)))
 634       (if (org-bound-and-true-p org-edit-src-picture)
 635           (setq total-nindent (+ total-nindent 2)))
 636       (setq code (buffer-string))
 637       (set-buffer-modified-p nil))
 638     (org-src-switch-to-buffer (marker-buffer beg) (or context 'exit))
 639     (kill-buffer buffer)
 640     (goto-char beg)
 641     (when allow-write-back-p
 642       (delete-region beg end)
 643       (insert code)
 644       (goto-char beg)
 645       (if single (just-one-space)))
 646     (if (memq t (mapcar (lambda (overlay)
 647                           (eq (overlay-get overlay 'invisible)
 648                               'org-hide-block))
 649                         (overlays-at (point))))
 650         ;; Block is hidden; put point at start of block
 651         (beginning-of-line 0)
 652       ;; Block is visible, put point where it was in the code buffer
 653       (org-goto-line (1- (+ (org-current-line) line)))
 654       (org-move-to-column (if preserve-indentation col (+ col total-nindent delta))))
 655     (move-marker beg nil)
 656     (move-marker end nil))
 657   (unless (eq context 'save)
 658     (when org-edit-src-saved-temp-window-config
 659       (set-window-configuration org-edit-src-saved-temp-window-config)
 660       (setq org-edit-src-saved-temp-window-config nil))))
 661
 662 (defun org-edit-src-save ()
 663   "Save parent buffer with current state source-code buffer."
 664   (interactive)
 665   (let ((p (point)) (m (mark)) msg)
 666     (save-window-excursion
 667       (org-edit-src-exit 'save)
 668       (save-buffer)
 669       (setq msg (current-message))
 670       (if (eq org-src-window-setup 'other-frame)
 671           (let ((org-src-window-setup 'current-window))
 672             (org-edit-src-code 'save))
 673         (org-edit-src-code 'save)))
 674     (push-mark m 'nomessage)
 675     (goto-char (min p (point-max)))
 676     (message (or msg ""))))
 677
 678 (defun org-src-mode-configure-edit-buffer ()
 679   (when (org-bound-and-true-p org-edit-src-from-org-mode)
 680     (org-add-hook 'kill-buffer-hook
 681                   #'(lambda () (delete-overlay org-edit-src-overlay)) nil 'local)
 682     (if (org-bound-and-true-p org-edit-src-allow-write-back-p)
 683         (progn
 684           (setq buffer-offer-save t)
 685           (setq buffer-file-name
 686                 (concat (buffer-file-name (marker-buffer org-edit-src-beg-marker))
 687                         "[" (buffer-name) "]"))
 688           (if (featurep 'xemacs)
 689               (progn
 690                 (make-variable-buffer-local 'write-contents-hooks) ; needed only for 21.4
 691                 (setq write-contents-hooks '(org-edit-src-save)))
 692             (setq write-contents-functions '(org-edit-src-save))))
 693       (setq buffer-read-only t))))
 694
 695 (org-add-hook 'org-src-mode-hook 'org-src-mode-configure-edit-buffer)
 696
 697
 698 (defun org-src-associate-babel-session (info)
 699   "Associate edit buffer with comint session."
 700   (interactive)
 701   (let ((session (cdr (assoc :session (nth 2 info)))))
 702     (and session (not (string= session "none"))
 703          (org-babel-comint-buffer-livep session)
 704          ((lambda (f) (and (fboundp f) (funcall f session)))
 705           (intern (format "org-babel-%s-associate-session" (nth 0 info)))))))
 706
 707 (defun org-src-babel-configure-edit-buffer ()
 708   (when org-src-babel-info
 709     (org-src-associate-babel-session org-src-babel-info)))
 710
 711 (org-add-hook 'org-src-mode-hook 'org-src-babel-configure-edit-buffer)
 712 (defmacro org-src-do-at-code-block (&rest body)
 713   "Execute a command from an edit buffer in the Org-mode buffer."
 714   `(let ((beg-marker org-edit-src-beg-marker))
 715      (if beg-marker
 716          (with-current-buffer (marker-buffer beg-marker)
 717            (goto-char (marker-position beg-marker))
 718            ,@body))))
 719 (def-edebug-spec org-src-do-at-code-block (body))
 720
 721 (defun org-src-do-key-sequence-at-code-block (&optional key)
 722   "Execute key sequence at code block in the source Org buffer.
 723 The command bound to KEY in the Org-babel key map is executed
 724 remotely with point temporarily at the start of the code block in
 725 the Org buffer.
 726
 727 This command is not bound to a key by default, to avoid conflicts
 728 with language major mode bindings. To bind it to C-c @ in all
 729 language major modes, you could use
 730
 731   (add-hook 'org-src-mode-hook
 732             (lambda () (define-key org-src-mode-map \"\\C-c@\"
 733                     'org-src-do-key-sequence-at-code-block)))
 734
 735 In that case, for example, C-c @ t issued in code edit buffers
 736 would tangle the current Org code block, C-c @ e would execute
 737 the block and C-c @ h would display the other available
 738 Org-babel commands."
 739   (interactive "kOrg-babel key: ")
 740   (if (equal key (kbd "C-g")) (keyboard-quit)
 741     (org-edit-src-save)
 742     (org-src-do-at-code-block
 743      (call-interactively
 744       (lookup-key org-babel-map key)))))
 745
 746 (defcustom org-src-tab-acts-natively nil
 747   "If non-nil, the effect of TAB in a code block is as if it were
 748 issued in the language major mode buffer."
 749   :type 'boolean
 750   :group 'org-babel)
 751
 752 (defun org-src-native-tab-command-maybe ()
 753   "Perform language-specific TAB action.
 754 Alter code block according to effect of TAB in the language major
 755 mode."
 756   (and org-src-tab-acts-natively
 757        (let ((org-src-strip-leading-and-trailing-blank-lines nil))
 758          (org-babel-do-key-sequence-in-edit-buffer (kbd "TAB")))))
 759
 760 (add-hook 'org-tab-first-hook 'org-src-native-tab-command-maybe)
 761
 762 (defun org-src-font-lock-fontify-block (lang start end)
 763   "Fontify code block.
 764 This function is called by emacs automatic fontification, as long
 765 as `org-src-fontify-natively' is non-nil. For manual
 766 fontification of code blocks see `org-src-fontify-block' and
 767 `org-src-fontify-buffer'"
 768   (let ((lang-mode (org-src-get-lang-mode lang)))
 769     (if (fboundp lang-mode)
 770         (let ((string (buffer-substring-no-properties start end))
 771               (modified (buffer-modified-p))
 772               (org-buffer (current-buffer)) pos next)
 773           (remove-text-properties start end '(face nil))
 774           (with-current-buffer
 775               (get-buffer-create
 776                (concat " org-src-fontification:" (symbol-name lang-mode)))
 777             (delete-region (point-min) (point-max))
 778             (insert (concat string " ")) ;; so there's a final property change
 779             (unless (eq major-mode lang-mode) (funcall lang-mode))
 780             (font-lock-fontify-buffer)
 781             (setq pos (point-min))
 782             (while (setq next (next-single-property-change pos 'face))
 783               (put-text-property
 784                (+ start (1- pos)) (+ start next) 'face
 785                (get-text-property pos 'face) org-buffer)
 786               (setq pos next)))
 787           (add-text-properties
 788            start end
 789            '(font-lock-fontified t fontified t font-lock-multiline t))
 790           (set-buffer-modified-p modified)))))
 791
 792 (defun org-src-fontify-block ()
 793   "Fontify code block at point."
 794   (interactive)
 795   (save-excursion
 796     (let ((org-src-fontify-natively t)
 797           (info (org-edit-src-find-region-and-lang)))
 798       (font-lock-fontify-region (nth 0 info) (nth 1 info)))))
 799
 800 (defun org-src-fontify-buffer ()
 801   "Fontify all code blocks in the current buffer"
 802   (interactive)
 803   (org-babel-map-src-blocks nil
 804     (org-src-fontify-block)))
 805
 806 (defun org-src-get-lang-mode (lang)
 807   "Return major mode that should be used for LANG.
 808 LANG is a string, and the returned major mode is a symbol."
 809   (intern
 810    (concat
 811     ((lambda (l) (if (symbolp l) (symbol-name l) l))
 812      (or (cdr (assoc lang org-src-lang-modes)) lang)) "-mode")))
 813
 814 (provide 'org-src)
 815
 816 ;;; org-src.el ends here