lisp/org-src.el

   1 ;;; org-src.el --- Source code examples in Org
   2 ;;
   3 ;; Copyright (C) 2004-2012 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-strip-protective-commas "org" (beg end))
  45 (declare-function org-pop-to-buffer-same-window
  46                   "org-compat" (&optional buffer-or-name norecord label))
  47 (declare-function org-strip-protective-commas "org" (beg end))
  48 (declare-function org-base-buffer "org" (buffer))
  49
  50 (defcustom org-edit-src-region-extra nil
  51   "Additional regexps to identify regions for editing with `org-edit-src-code'.
  52 For examples see the function `org-edit-src-find-region-and-lang'.
  53 The regular expression identifying the begin marker should end with a newline,
  54 and the regexp marking the end line should start with a newline, to make sure
  55 there are kept outside the narrowed region."
  56   :group 'org-edit-structure
  57   :type '(repeat
  58           (list
  59            (regexp :tag "begin regexp")
  60            (regexp :tag "end regexp")
  61            (choice :tag "language"
  62                    (string :tag "specify")
  63                    (integer :tag "from match group")
  64                    (const :tag "from `lang' element")
  65                    (const :tag "from `style' element")))))
  66
  67 (defcustom org-coderef-label-format "(ref:%s)"
  68   "The default coderef format.
  69 This format string will be used to search for coderef labels in literal
  70 examples (EXAMPLE and SRC blocks).  The format can be overwritten in
  71 an individual literal example with the -l option, like
  72
  73 #+BEGIN_SRC pascal +n -r -l \"((%s))\"
  74 ...
  75 #+END_SRC
  76
  77 If you want to use this for HTML export, make sure that the format does
  78 not introduce special font-locking, and avoid the HTML special
  79 characters `<', `>', and `&'.  The reason for this restriction is that
  80 the labels are searched for only after htmlize has done its job."
  81   :group 'org-edit-structure ; FIXME this is not in the right group
  82   :type 'string)
  83
  84 (defcustom org-edit-fixed-width-region-mode 'artist-mode
  85   "The mode that should be used to edit fixed-width regions.
  86 These are the regions where each line starts with a colon."
  87   :group 'org-edit-structure
  88   :type '(choice
  89           (const artist-mode)
  90           (const picture-mode)
  91           (const fundamental-mode)
  92           (function :tag "Other (specify)")))
  93
  94 (defcustom org-src-preserve-indentation nil
  95   "If non-nil preserve leading whitespace characters on export.
  96 If non-nil leading whitespace characters in source code blocks
  97 are preserved on export, and when switching between the org
  98 buffer and the language mode edit buffer.  If this variable is nil
  99 then, after editing with \\[org-edit-src-code], the
 100 minimum (across-lines) number of leading whitespace characters
 101 are removed from all lines, and the code block is uniformly
 102 indented according to the value of `org-edit-src-content-indentation'."
 103   :group 'org-edit-structure
 104   :type 'boolean)
 105
 106 (defcustom org-edit-src-content-indentation 2
 107   "Indentation for the content of a source code block.
 108 This should be the number of spaces added to the indentation of the #+begin
 109 line in order to compute the indentation of the block content after
 110 editing it with \\[org-edit-src-code].  Has no effect if
 111 `org-src-preserve-indentation' is non-nil."
 112   :group 'org-edit-structure
 113   :type 'integer)
 114
 115 (defvar org-src-strip-leading-and-trailing-blank-lines nil
 116   "If non-nil, blank lines are removed when exiting the code edit
 117 buffer.")
 118
 119 (defcustom org-edit-src-persistent-message t
 120   "Non-nil means show persistent exit help message while editing src examples.
 121 The message is shown in the header-line, which will be created in the
 122 first line of the window showing the editing buffer."
 123   :group 'org-edit-structure
 124   :type 'boolean)
 125
 126 (defcustom org-src-window-setup 'reorganize-frame
 127   "How the source code edit buffer should be displayed.
 128 Possible values for this option are:
 129
 130 current-window    Show edit buffer in the current window, keeping all other
 131                   windows.
 132 other-window      Use `switch-to-buffer-other-window' to display edit buffer.
 133 reorganize-frame  Show only two windows on the current frame, the current
 134                   window and the edit buffer. When exiting the edit buffer,
 135                   return to one window.
 136 other-frame       Use `switch-to-buffer-other-frame' to display edit buffer.
 137                   Also, when exiting the edit buffer, kill that frame."
 138   :group 'org-edit-structure
 139   :type '(choice
 140           (const current-window)
 141           (const other-frame)
 142           (const other-window)
 143           (const reorganize-frame)))
 144
 145 (defvar org-src-mode-hook nil
 146   "Hook  run after Org switched a source code snippet to its Emacs mode.
 147 This hook will run
 148
 149 - when editing a source code snippet with \"C-c '\".
 150 - When formatting a source code snippet for export with htmlize.
 151
 152 You may want to use this hook for example to turn off `outline-minor-mode'
 153 or similar things which you want to have when editing a source code file,
 154 but which mess up the display of a snippet in Org exported files.")
 155
 156 (defcustom org-src-lang-modes
 157   '(("ocaml" . tuareg) ("elisp" . emacs-lisp) ("ditaa" . artist)
 158     ("asymptote" . asy) ("dot" . fundamental) ("sqlite" . sql)
 159     ("calc" . fundamental) ("C" . c) ("cpp" . c++)
 160     ("screen" . shell-script))
 161   "Alist mapping languages to their major mode.
 162 The key is the language name, the value is the string that should
 163 be inserted as the name of the major mode.  For many languages this is
 164 simple, but for language where this is not the case, this variable
 165 provides a way to simplify things on the user side.
 166 For example, there is no ocaml-mode in Emacs, but the mode to use is
 167 `tuareg-mode'."
 168   :group 'org-edit-structure
 169   :type '(repeat
 170           (cons
 171            (string "Language name")
 172            (symbol "Major mode"))))
 173
 174 ;;; Editing source examples
 175
 176 (defvar org-src-mode-map (make-sparse-keymap))
 177 (define-key org-src-mode-map "\C-c'" 'org-edit-src-exit)
 178 (define-key org-src-mode-map "\C-x\C-s" 'org-edit-src-save)
 179
 180 (defvar org-edit-src-force-single-line nil)
 181 (defvar org-edit-src-from-org-mode nil)
 182 (defvar org-edit-src-allow-write-back-p t)
 183 (defvar org-edit-src-picture nil)
 184 (defvar org-edit-src-beg-marker nil)
 185 (defvar org-edit-src-end-marker nil)
 186 (defvar org-edit-src-overlay nil)
 187 (defvar org-edit-src-block-indentation nil)
 188 (defvar org-edit-src-saved-temp-window-config nil)
 189
 190 (defvar org-src-ask-before-returning-to-edit-buffer t
 191   "If nil, when org-edit-src code is used on a block that already
 192   has an active edit buffer, it will switch to that edit buffer
 193   immediately; otherwise it will ask whether you want to return
 194   to the existing edit buffer.")
 195
 196 (defvar org-src-babel-info nil)
 197
 198 (define-minor-mode org-src-mode
 199   "Minor mode for language major mode buffers generated by org.
 200 This minor mode is turned on in two situations:
 201 - when editing a source code snippet with \"C-c '\".
 202 - When formatting a source code snippet for export with htmlize.
 203 There is a mode hook, and keybindings for `org-edit-src-exit' and
 204 `org-edit-src-save'")
 205
 206 (defun org-edit-src-code (&optional context code edit-buffer-name)
 207   "Edit the source code example at point.
 208 The example is copied to a separate buffer, and that buffer is
 209 switched to the correct language mode.  When done, exit with
 210 \\[org-edit-src-exit].  This will remove the original code in the
 211 Org buffer, and replace it with the edited version. Optional
 212 argument CONTEXT is used by \\[org-edit-src-save] when calling
 213 this function. See \\[org-src-window-setup] to configure the
 214 display of windows containing the Org buffer and the code
 215 buffer."
 216   (interactive)
 217   (unless (eq context 'save)
 218     (setq org-edit-src-saved-temp-window-config (current-window-configuration)))
 219   (let* ((mark (and (org-region-active-p) (mark)))
 220          (case-fold-search t)
 221          (info (org-edit-src-find-region-and-lang))
 222          (full-info (org-babel-get-src-block-info 'light))
 223          (org-mode-p (derived-mode-p 'org-mode)) ;; derived-mode-p is reflexive
 224          (beg (make-marker))
 225          (end (make-marker))
 226          (allow-write-back-p (null code))
 227          block-nindent total-nindent ovl lang lang-f single lfmt buffer msg
 228          begline markline markcol line col transmitted-variables)
 229     (if (not info)
 230         nil
 231       (setq beg (move-marker beg (nth 0 info))
 232             end (move-marker end (nth 1 info))
 233             msg (if allow-write-back-p
 234                     (substitute-command-keys
 235                      "Edit, then exit with C-c ' (C-c and single quote)")
 236                   "Exit with C-c ' (C-c and single quote)")
 237             code (or code (buffer-substring-no-properties beg end))
 238             lang (or (cdr (assoc (nth 2 info) org-src-lang-modes))
 239                      (nth 2 info))
 240             lang (if (symbolp lang) (symbol-name lang) lang)
 241             single (nth 3 info)
 242             block-nindent (nth 5 info)
 243             lang-f (intern (concat lang "-mode"))
 244             begline (save-excursion (goto-char beg) (org-current-line))
 245             transmitted-variables
 246             `((org-edit-src-content-indentation
 247                ,org-edit-src-content-indentation)
 248               (org-edit-src-force-single-line ,single)
 249               (org-edit-src-from-org-mode ,org-mode-p)
 250               (org-edit-src-allow-write-back-p ,allow-write-back-p)
 251               (org-src-preserve-indentation ,org-src-preserve-indentation)
 252               (org-src-babel-info ,(org-babel-get-src-block-info 'light))
 253               (org-coderef-label-format
 254                ,(or (nth 4 info) org-coderef-label-format))
 255               (org-edit-src-beg-marker ,beg)
 256               (org-edit-src-end-marker ,end)
 257               (org-edit-src-block-indentation ,block-nindent)))
 258       (if (and mark (>= mark beg) (<= mark (1+ end)))
 259           (save-excursion (goto-char (min mark end))
 260                           (setq markline (org-current-line)
 261                                 markcol (current-column))))
 262       (if (equal lang-f 'table.el-mode)
 263           (setq lang-f (lambda ()
 264                          (text-mode)
 265                          (if (org-bound-and-true-p flyspell-mode)
 266                              (flyspell-mode -1))
 267                          (table-recognize)
 268                          (org-set-local 'org-edit-src-content-indentation 0))))
 269       (unless (functionp lang-f)
 270         (error "No such language mode: %s" lang-f))
 271       (save-excursion
 272         (if (> (point) end) (goto-char end))
 273         (setq line (org-current-line)
 274               col (current-column)))
 275       (if (and (setq buffer (org-edit-src-find-buffer beg end))
 276                (if org-src-ask-before-returning-to-edit-buffer
 277                    (y-or-n-p "Return to existing edit buffer? [n] will revert changes: ") t))
 278           (org-src-switch-to-buffer buffer 'return)
 279         (when buffer
 280           (with-current-buffer buffer
 281             (if (boundp 'org-edit-src-overlay)
 282                 (delete-overlay org-edit-src-overlay)))
 283           (kill-buffer buffer))
 284         (setq buffer (generate-new-buffer
 285                       (or edit-buffer-name
 286                           (org-src-construct-edit-buffer-name (buffer-name) lang))))
 287         (setq ovl (make-overlay beg end))
 288         (overlay-put ovl 'edit-buffer buffer)
 289         (overlay-put ovl 'help-echo "Click with mouse-1 to switch to buffer editing this segment")
 290         (overlay-put ovl 'face 'secondary-selection)
 291         (overlay-put ovl
 292                      'keymap
 293                      (let ((map (make-sparse-keymap)))
 294                        (define-key map [mouse-1] 'org-edit-src-continue)
 295                        map))
 296         (overlay-put ovl :read-only "Leave me alone")
 297         (setq transmitted-variables
 298               (append transmitted-variables `((org-edit-src-overlay ,ovl))))
 299         (org-src-switch-to-buffer buffer 'edit)
 300         (if (eq single 'macro-definition)
 301             (setq code (replace-regexp-in-string "\\\\n" "\n" code t t)))
 302         (insert code)
 303         (remove-text-properties (point-min) (point-max)
 304                                 '(display nil invisible nil intangible nil))
 305         (unless (cadr (assq 'org-src-preserve-indentation transmitted-variables))
 306           (setq total-nindent (or (org-do-remove-indentation) 0)))
 307         (let ((org-inhibit-startup t))
 308           (condition-case e
 309               (funcall lang-f)
 310             (error
 311              (error "Language mode `%s' fails with: %S" lang-f (nth 1 e)))))
 312         (dolist (pair transmitted-variables)
 313           (org-set-local (car pair) (cadr pair)))
 314         (if (derived-mode-p 'org-mode)
 315             (progn
 316               (goto-char (point-min))
 317               (while (re-search-forward "^," nil t)
 318                 (if (eq (org-current-line) line) (setq total-nindent (1+ total-nindent)))
 319                 (replace-match "")))
 320           (org-strip-protective-commas (point-min) (point-max)))
 321         (when markline
 322           (org-goto-line (1+ (- markline begline)))
 323           (org-move-to-column
 324            (if org-src-preserve-indentation markcol
 325              (max 0 (- markcol total-nindent))))
 326           (push-mark (point) 'no-message t)
 327           (setq deactivate-mark nil))
 328         (org-goto-line (1+ (- line begline)))
 329         (org-move-to-column
 330          (if org-src-preserve-indentation col (max 0 (- col total-nindent))))
 331         (org-src-mode)
 332         (set-buffer-modified-p nil)
 333         (setq buffer-file-name nil)
 334         (and org-edit-src-persistent-message
 335              (org-set-local 'header-line-format msg))
 336         (let ((edit-prep-func (intern (concat "org-babel-edit-prep:" lang))))
 337           (when (fboundp edit-prep-func)
 338             (funcall edit-prep-func full-info))))
 339       t)))
 340
 341 (defun org-edit-src-continue (e)
 342   (interactive "e")
 343   (mouse-set-point e)
 344   (let ((buf (get-char-property (point) 'edit-buffer)))
 345     (if buf (org-src-switch-to-buffer buf 'continue)
 346       (error "Something is wrong here"))))
 347
 348 (defun org-src-switch-to-buffer (buffer context)
 349   (case org-src-window-setup
 350     ('current-window
 351      (org-pop-to-buffer-same-window buffer))
 352     ('other-window
 353      (switch-to-buffer-other-window buffer))
 354     ('other-frame
 355      (case context
 356        ('exit
 357         (let ((frame (selected-frame)))
 358           (switch-to-buffer-other-frame buffer)
 359           (delete-frame frame)))
 360        ('save
 361         (kill-buffer (current-buffer))
 362         (org-pop-to-buffer-same-window buffer))
 363        (t
 364         (switch-to-buffer-other-frame buffer))))
 365     ('reorganize-frame
 366      (if (eq context 'edit) (delete-other-windows))
 367      (org-switch-to-buffer-other-window buffer)
 368      (if (eq context 'exit) (delete-other-windows)))
 369     ('switch-invisibly
 370      (set-buffer buffer))
 371     (t
 372      (message "Invalid value %s for org-src-window-setup"
 373               (symbol-name org-src-window-setup))
 374      (org-pop-to-buffer-same-window buffer))))
 375
 376 (defun org-src-construct-edit-buffer-name (org-buffer-name lang)
 377   "Construct the buffer name for a source editing buffer."
 378   (concat "*Org Src " org-buffer-name "[ " lang " ]*"))
 379
 380 (defun org-src-edit-buffer-p (&optional buffer)
 381   "Test whether BUFFER (or the current buffer if BUFFER is nil)
 382 is a source block editing buffer."
 383   (let ((buffer (org-base-buffer (or buffer (current-buffer)))))
 384     (and (buffer-name buffer)
 385          (string-match "\\`*Org Src " (buffer-name buffer))
 386          (local-variable-p 'org-edit-src-beg-marker buffer)
 387          (local-variable-p 'org-edit-src-end-marker buffer))))
 388
 389 (defun org-edit-src-find-buffer (beg end)
 390   "Find a source editing buffer that is already editing the region BEG to END."
 391   (catch 'exit
 392     (mapc
 393      (lambda (b)
 394        (with-current-buffer b
 395          (if (and (string-match "\\`*Org Src " (buffer-name))
 396                   (local-variable-p 'org-edit-src-beg-marker (current-buffer))
 397                   (local-variable-p 'org-edit-src-end-marker (current-buffer))
 398                   (equal beg org-edit-src-beg-marker)
 399                   (equal end org-edit-src-end-marker))
 400              (throw 'exit (current-buffer)))))
 401      (buffer-list))
 402     nil))
 403
 404 (defun org-edit-fixed-width-region ()
 405   "Edit the fixed-width ascii drawing at point.
 406 This must be a region where each line starts with a colon followed by
 407 a space character.
 408 An new buffer is created and the fixed-width region is copied into it,
 409 and the buffer is switched into `artist-mode' for editing.  When done,
 410 exit with \\[org-edit-src-exit].  The edited text will then replace
 411 the fragment in the Org-mode buffer."
 412   (interactive)
 413   (let ((line (org-current-line))
 414         (col (current-column))
 415         (case-fold-search t)
 416         (msg (substitute-command-keys
 417               "Edit, then exit with C-c ' (C-c and single quote)"))
 418         (org-mode-p (derived-mode-p 'org-mode))
 419         (beg (make-marker))
 420         (end (make-marker))
 421         (preserve-indentation org-src-preserve-indentation)
 422         block-nindent ovl beg1 end1 code begline buffer)
 423     (beginning-of-line 1)
 424     (if (looking-at "[ \t]*[^:\n \t]")
 425         nil
 426       (if (looking-at "[ \t]*\\(\n\\|\\'\\)")
 427           (setq beg1 (point) end1 beg1)
 428         (save-excursion
 429           (if (re-search-backward "^[ \t]*[^: \t]" nil 'move)
 430               (setq beg1 (point-at-bol 2))
 431             (setq beg1 (point))))
 432         (save-excursion
 433           (if (re-search-forward "^[ \t]*[^: \t]" nil 'move)
 434               (setq end1 (1- (match-beginning 0)))
 435             (setq end1 (point))))
 436         (org-goto-line line))
 437       (setq beg (move-marker beg beg1)
 438             end (move-marker end end1)
 439             code (buffer-substring-no-properties beg end)
 440             begline (save-excursion (goto-char beg) (org-current-line)))
 441       (if (and (setq buffer (org-edit-src-find-buffer beg end))
 442                (y-or-n-p "Return to existing edit buffer? [n] will revert changes: "))
 443           (org-pop-to-buffer-same-window buffer)
 444         (when buffer
 445           (with-current-buffer buffer
 446             (if (boundp 'org-edit-src-overlay)
 447                 (delete-overlay org-edit-src-overlay)))
 448           (kill-buffer buffer))
 449         (setq buffer (generate-new-buffer
 450                       (org-src-construct-edit-buffer-name
 451                        (buffer-name) "Fixed Width")))
 452         (setq ovl (make-overlay beg end))
 453         (overlay-put ovl 'face 'secondary-selection)
 454         (overlay-put ovl 'edit-buffer buffer)
 455         (overlay-put ovl 'help-echo "Click with mouse-1 to switch to buffer editing this segment")
 456         (overlay-put ovl 'face 'secondary-selection)
 457         (overlay-put ovl
 458                          'keymap
 459                          (let ((map (make-sparse-keymap)))
 460                            (define-key map [mouse-1] 'org-edit-src-continue)
 461                            map))
 462         (overlay-put ovl :read-only "Leave me alone")
 463         (org-pop-to-buffer-same-window buffer)
 464         (insert code)
 465         (remove-text-properties (point-min) (point-max)
 466                                 '(display nil invisible nil intangible nil))
 467         (setq block-nindent (or (org-do-remove-indentation) 0))
 468         (cond
 469          ((eq org-edit-fixed-width-region-mode 'artist-mode)
 470           (fundamental-mode)
 471           (artist-mode 1))
 472          (t (funcall org-edit-fixed-width-region-mode)))
 473         (set (make-local-variable 'org-edit-src-force-single-line) nil)
 474         (set (make-local-variable 'org-edit-src-from-org-mode) org-mode-p)
 475         (set (make-local-variable 'org-edit-src-picture) t)
 476         (goto-char (point-min))
 477         (while (re-search-forward "^[ \t]*: ?" nil t)
 478           (replace-match ""))
 479         (org-goto-line (1+ (- line begline)))
 480         (org-move-to-column (max 0 (- col block-nindent 2)))
 481         (org-set-local 'org-edit-src-beg-marker beg)
 482         (org-set-local 'org-edit-src-end-marker end)
 483         (org-set-local 'org-edit-src-overlay ovl)
 484         (org-set-local 'org-edit-src-block-indentation block-nindent)
 485         (org-set-local 'org-edit-src-content-indentation 0)
 486         (org-set-local 'org-src-preserve-indentation nil)
 487         (org-src-mode)
 488         (set-buffer-modified-p nil)
 489         (and org-edit-src-persistent-message
 490              (org-set-local 'header-line-format msg)))
 491       (message "%s" msg)
 492       t)))
 493
 494 (defun org-edit-src-find-region-and-lang ()
 495   "Find the region and language for a local edit.
 496 Return a list with beginning and end of the region, a string representing
 497 the language, a switch telling if the content should be in a single line."
 498   (let ((re-list
 499          (append
 500           org-edit-src-region-extra
 501           '(
 502             ("<src\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</src>" lang)
 503             ("<literal\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</literal>" style)
 504             ("<example>[ \t]*\n?" "\n?[ \t]*</example>" "fundamental")
 505             ("<lisp>[ \t]*\n?" "\n?[ \t]*</lisp>" "emacs-lisp")
 506             ("<perl>[ \t]*\n?" "\n?[ \t]*</perl>" "perl")
 507             ("<python>[ \t]*\n?" "\n?[ \t]*</python>" "python")
 508             ("<ruby>[ \t]*\n?" "\n?[ \t]*</ruby>" "ruby")
 509             ("^[ \t]*#\\+begin_src\\( \\([^ \t\n]+\\)\\)?.*\n" "\n[ \t]*#\\+end_src" 2)
 510             ("^[ \t]*#\\+begin_example.*\n" "\n[ \t]*#\\+end_example" "fundamental")
 511             ("^[ \t]*#\\+html:" "\n" "html" single-line)
 512             ("^[ \t]*#\\+begin_html.*\n" "\n[ \t]*#\\+end_html" "html")
 513             ("^[ \t]*#\\+latex:" "\n" "latex" single-line)
 514             ("^[ \t]*#\\+begin_latex.*\n" "\n[ \t]*#\\+end_latex" "latex")
 515             ("^[ \t]*#\\+ascii:" "\n" "fundamental" single-line)
 516             ("^[ \t]*#\\+begin_ascii.*\n" "\n[ \t]*#\\+end_ascii" "fundamental")
 517             ("^[ \t]*#\\+docbook:" "\n" "xml" single-line)
 518             ("^[ \t]*#\\+macro:[ \t]+\\S-+\\( \\|$\\)"
 519              "\n" "fundamental" macro-definition)
 520             ("^[ \t]*#\\+begin_docbook.*\n" "\n[ \t]*#\\+end_docbook" "xml")
 521             )))
 522         (pos (point))
 523         re1 re2 single beg end lang lfmt match-re1 ind entry)
 524     (catch 'exit
 525       (while (setq entry (pop re-list))
 526         (setq re1 (car entry) re2 (nth 1 entry) lang (nth 2 entry)
 527               single (nth 3 entry))
 528         (save-excursion
 529           (if (or (looking-at re1)
 530                   (re-search-backward re1 nil t))
 531               (progn
 532                 (setq match-re1 (match-string 0))
 533                 (setq beg (match-end 0)
 534                       lang (org-edit-src-get-lang lang)
 535                       lfmt (org-edit-src-get-label-format match-re1)
 536                       ind (org-edit-src-get-indentation (match-beginning 0)))
 537                 (if (and (re-search-forward re2 nil t)
 538                          (>= (match-end 0) pos))
 539                     (throw 'exit (list beg (match-beginning 0)
 540                                        lang single lfmt ind))))
 541             (if (or (looking-at re2)
 542                     (re-search-forward re2 nil t))
 543                 (progn
 544                   (setq end (match-beginning 0))
 545                   (if (and (re-search-backward re1 nil t)
 546                            (<= (match-beginning 0) pos))
 547                       (progn
 548                         (setq lfmt (org-edit-src-get-label-format
 549                                     (match-string 0))
 550                               ind (org-edit-src-get-indentation
 551                                    (match-beginning 0)))
 552                         (throw 'exit
 553                                (list (match-end 0) end
 554                                      (org-edit-src-get-lang lang)
 555                                      single lfmt ind)))))))))
 556       (when (org-at-table.el-p)
 557         (re-search-backward "^[\t]*[^ \t|\\+]" nil t)
 558         (setq beg (1+ (point-at-eol)))
 559         (goto-char beg)
 560         (or (re-search-forward "^[\t]*[^ \t|\\+]" nil t)
 561             (progn (goto-char (point-max)) (newline)))
 562         (setq end (point-at-bol))
 563         (setq ind (org-edit-src-get-indentation beg))
 564         (throw 'exit (list beg end 'table.el nil nil ind))))))
 565
 566 (defun org-edit-src-get-lang (lang)
 567   "Extract the src language."
 568   (let ((m (match-string 0)))
 569     (cond
 570      ((stringp lang) lang)
 571      ((integerp lang) (match-string lang))
 572      ((and (eq lang 'lang)
 573            (string-match "\\<lang=\"\\([^ \t\n\"]+\\)\"" m))
 574       (match-string 1 m))
 575      ((and (eq lang 'style)
 576            (string-match "\\<style=\"\\([^ \t\n\"]+\\)\"" m))
 577       (match-string 1 m))
 578      (t "fundamental"))))
 579
 580 (defun org-edit-src-get-label-format (s)
 581   "Extract the label format."
 582   (save-match-data
 583     (if (string-match "-l[ \t]+\\\\?\"\\([^\t\r\n\"]+\\)\\\\?\"" s)
 584         (match-string 1 s))))
 585
 586 (defun org-edit-src-get-indentation (pos)
 587   "Count leading whitespace characters on line."
 588   (save-match-data
 589     (goto-char pos)
 590     (org-get-indentation)))
 591
 592 (defun org-edit-src-exit (&optional context)
 593   "Exit special edit and protect problematic lines."
 594   (interactive)
 595   (unless (org-bound-and-true-p org-edit-src-from-org-mode)
 596     (error "This is not a sub-editing buffer, something is wrong"))
 597   (widen)
 598   (let* ((beg org-edit-src-beg-marker)
 599          (end org-edit-src-end-marker)
 600          (ovl org-edit-src-overlay)
 601          (buffer (current-buffer))
 602          (single (org-bound-and-true-p org-edit-src-force-single-line))
 603          (macro (eq single 'macro-definition))
 604          (total-nindent (+ (or org-edit-src-block-indentation 0)
 605                            org-edit-src-content-indentation))
 606          (preserve-indentation org-src-preserve-indentation)
 607          (allow-write-back-p (org-bound-and-true-p org-edit-src-allow-write-back-p))
 608          (delta 0) code line col indent)
 609     (when allow-write-back-p
 610       (unless preserve-indentation (untabify (point-min) (point-max)))
 611       (if org-src-strip-leading-and-trailing-blank-lines
 612           (save-excursion
 613             (goto-char (point-min))
 614             (if (looking-at "[ \t\n]*\n") (replace-match ""))
 615             (unless macro
 616               (if (re-search-forward "\n[ \t\n]*\\'" nil t) (replace-match ""))))))
 617     (setq line (if (org-bound-and-true-p org-edit-src-force-single-line)
 618                    1
 619                  (org-current-line))
 620           col (current-column))
 621     (when allow-write-back-p
 622       (when single
 623         (goto-char (point-min))
 624         (if (re-search-forward "\\s-+\\'" nil t) (replace-match ""))
 625         (goto-char (point-min))
 626         (let ((cnt 0))
 627           (while (re-search-forward "\n" nil t)
 628             (setq cnt (1+ cnt))
 629             (replace-match (if macro "\\n" " ") t t))
 630           (when (and macro (> cnt 0))
 631             (goto-char (point-max)) (insert "\\n")))
 632         (goto-char (point-min))
 633         (if (looking-at "\\s-*") (replace-match " ")))
 634       (when (org-bound-and-true-p org-edit-src-from-org-mode)
 635         (goto-char (point-min))
 636         (while (re-search-forward
 637                 (if (derived-mode-p 'org-mode) "^\\(.\\)" "^\\([*]\\|[ \t]*#\\+\\)") nil t)
 638           (if (eq (org-current-line) line) (setq delta (1+ delta)))
 639           (replace-match ",\\1")))
 640       (when (org-bound-and-true-p org-edit-src-picture)
 641         (setq preserve-indentation nil)
 642         (untabify (point-min) (point-max))
 643         (goto-char (point-min))
 644         (while (re-search-forward "^" nil t)
 645           (replace-match ": ")))
 646       (unless (or single preserve-indentation (= total-nindent 0))
 647         (setq indent (make-string total-nindent ?\ ))
 648         (goto-char (point-min))
 649         (while (re-search-forward "^" nil t)
 650           (replace-match indent)))
 651       (if (org-bound-and-true-p org-edit-src-picture)
 652           (setq total-nindent (+ total-nindent 2)))
 653       (setq code (buffer-string))
 654       (set-buffer-modified-p nil))
 655     (org-src-switch-to-buffer (marker-buffer beg) (or context 'exit))
 656     (kill-buffer buffer)
 657     (goto-char beg)
 658     (when allow-write-back-p
 659       (delete-region beg end)
 660       (insert code)
 661       (goto-char beg)
 662       (if single (just-one-space)))
 663     (if (memq t (mapcar (lambda (overlay)
 664                           (eq (overlay-get overlay 'invisible)
 665                               'org-hide-block))
 666                         (overlays-at (point))))
 667         ;; Block is hidden; put point at start of block
 668         (beginning-of-line 0)
 669       ;; Block is visible, put point where it was in the code buffer
 670       (org-goto-line (1- (+ (org-current-line) line)))
 671       (org-move-to-column (if preserve-indentation col (+ col total-nindent delta))))
 672     (move-marker beg nil)
 673     (move-marker end nil))
 674   (unless (eq context 'save)
 675     (when org-edit-src-saved-temp-window-config
 676       (set-window-configuration org-edit-src-saved-temp-window-config)
 677       (setq org-edit-src-saved-temp-window-config nil))))
 678
 679 (defmacro org-src-in-org-buffer (&rest body)
 680   `(let ((p (point)) (m (mark)) (ul buffer-undo-list) msg)
 681      (save-window-excursion
 682        (org-edit-src-exit 'save)
 683        ,@body
 684        (setq msg (current-message))
 685        (if (eq org-src-window-setup 'other-frame)
 686            (let ((org-src-window-setup 'current-window))
 687              (org-edit-src-code 'save))
 688          (org-edit-src-code 'save)))
 689      (setq buffer-undo-list ul)
 690      (push-mark m 'nomessage)
 691      (goto-char (min p (point-max)))
 692      (message (or msg ""))))
 693 (def-edebug-spec org-src-in-org-buffer (body))
 694
 695 (defun org-edit-src-save ()
 696   "Save parent buffer with current state source-code buffer."
 697   (interactive)
 698   (org-src-in-org-buffer (save-buffer)))
 699
 700 (declare-function org-babel-tangle "ob-tangle" (&optional only-this-block target-file lang))
 701
 702 (defun org-src-tangle (arg)
 703   "Tangle the parent buffer."
 704   (interactive)
 705   (org-src-in-org-buffer (org-babel-tangle arg)))
 706
 707 (defun org-src-mode-configure-edit-buffer ()
 708   (when (org-bound-and-true-p org-edit-src-from-org-mode)
 709     (org-add-hook 'kill-buffer-hook
 710                   #'(lambda () (delete-overlay org-edit-src-overlay)) nil 'local)
 711     (if (org-bound-and-true-p org-edit-src-allow-write-back-p)
 712         (progn
 713           (setq buffer-offer-save t)
 714           (setq buffer-file-name
 715                 (concat (buffer-file-name (marker-buffer org-edit-src-beg-marker))
 716                         "[" (buffer-name) "]"))
 717           (if (featurep 'xemacs)
 718               (progn
 719                 (make-variable-buffer-local 'write-contents-hooks) ; needed only for 21.4
 720                 (setq write-contents-hooks '(org-edit-src-save)))
 721             (setq write-contents-functions '(org-edit-src-save))))
 722       (setq buffer-read-only t))))
 723
 724 (org-add-hook 'org-src-mode-hook 'org-src-mode-configure-edit-buffer)
 725
 726
 727 (defun org-src-associate-babel-session (info)
 728   "Associate edit buffer with comint session."
 729   (interactive)
 730   (let ((session (cdr (assoc :session (nth 2 info)))))
 731     (and session (not (string= session "none"))
 732          (org-babel-comint-buffer-livep session)
 733          ((lambda (f) (and (fboundp f) (funcall f session)))
 734           (intern (format "org-babel-%s-associate-session" (nth 0 info)))))))
 735
 736 (defun org-src-babel-configure-edit-buffer ()
 737   (when org-src-babel-info
 738     (org-src-associate-babel-session org-src-babel-info)))
 739
 740 (org-add-hook 'org-src-mode-hook 'org-src-babel-configure-edit-buffer)
 741 (defmacro org-src-do-at-code-block (&rest body)
 742   "Execute a command from an edit buffer in the Org-mode buffer."
 743   `(let ((beg-marker org-edit-src-beg-marker))
 744      (if beg-marker
 745          (with-current-buffer (marker-buffer beg-marker)
 746            (goto-char (marker-position beg-marker))
 747            ,@body))))
 748 (def-edebug-spec org-src-do-at-code-block (body))
 749
 750 (defun org-src-do-key-sequence-at-code-block (&optional key)
 751   "Execute key sequence at code block in the source Org buffer.
 752 The command bound to KEY in the Org-babel key map is executed
 753 remotely with point temporarily at the start of the code block in
 754 the Org buffer.
 755
 756 This command is not bound to a key by default, to avoid conflicts
 757 with language major mode bindings. To bind it to C-c @ in all
 758 language major modes, you could use
 759
 760   (add-hook 'org-src-mode-hook
 761             (lambda () (define-key org-src-mode-map \"\\C-c@\"
 762                     'org-src-do-key-sequence-at-code-block)))
 763
 764 In that case, for example, C-c @ t issued in code edit buffers
 765 would tangle the current Org code block, C-c @ e would execute
 766 the block and C-c @ h would display the other available
 767 Org-babel commands."
 768   (interactive "kOrg-babel key: ")
 769   (if (equal key (kbd "C-g")) (keyboard-quit)
 770     (org-edit-src-save)
 771     (org-src-do-at-code-block
 772      (call-interactively
 773       (lookup-key org-babel-map key)))))
 774
 775 (defcustom org-src-tab-acts-natively nil
 776   "If non-nil, the effect of TAB in a code block is as if it were
 777 issued in the language major mode buffer."
 778   :type 'boolean
 779   :version "24.1"
 780   :group 'org-babel)
 781
 782 (defun org-src-native-tab-command-maybe ()
 783   "Perform language-specific TAB action.
 784 Alter code block according to effect of TAB in the language major
 785 mode."
 786   (and org-src-tab-acts-natively
 787        (let ((org-src-strip-leading-and-trailing-blank-lines nil))
 788          (org-babel-do-key-sequence-in-edit-buffer (kbd "TAB")))))
 789
 790 (add-hook 'org-tab-first-hook 'org-src-native-tab-command-maybe)
 791
 792 (defun org-src-font-lock-fontify-block (lang start end)
 793   "Fontify code block.
 794 This function is called by emacs automatic fontification, as long
 795 as `org-src-fontify-natively' is non-nil. For manual
 796 fontification of code blocks see `org-src-fontify-block' and
 797 `org-src-fontify-buffer'"
 798   (let ((lang-mode (org-src-get-lang-mode lang)))
 799     (if (fboundp lang-mode)
 800         (let ((string (buffer-substring-no-properties start end))
 801               (modified (buffer-modified-p))
 802               (org-buffer (current-buffer)) pos next)
 803           (remove-text-properties start end '(face nil))
 804           (with-current-buffer
 805               (get-buffer-create
 806                (concat " org-src-fontification:" (symbol-name lang-mode)))
 807             (delete-region (point-min) (point-max))
 808             (insert (concat string " ")) ;; so there's a final property change
 809             (unless (eq major-mode lang-mode) (funcall lang-mode))
 810             (font-lock-fontify-buffer)
 811             (setq pos (point-min))
 812             (while (setq next (next-single-property-change pos 'face))
 813               (put-text-property
 814                (+ start (1- pos)) (+ start next) 'face
 815                (get-text-property pos 'face) org-buffer)
 816               (setq pos next)))
 817           (add-text-properties
 818            start end
 819            '(font-lock-fontified t fontified t font-lock-multiline t))
 820           (set-buffer-modified-p modified)))))
 821
 822 (defun org-src-fontify-block ()
 823   "Fontify code block at point."
 824   (interactive)
 825   (save-excursion
 826     (let ((org-src-fontify-natively t)
 827           (info (org-edit-src-find-region-and-lang)))
 828       (font-lock-fontify-region (nth 0 info) (nth 1 info)))))
 829
 830 (defun org-src-fontify-buffer ()
 831   "Fontify all code blocks in the current buffer"
 832   (interactive)
 833   (org-babel-map-src-blocks nil
 834     (org-src-fontify-block)))
 835
 836 (defun org-src-get-lang-mode (lang)
 837   "Return major mode that should be used for LANG.
 838 LANG is a string, and the returned major mode is a symbol."
 839   (intern
 840    (concat
 841     ((lambda (l) (if (symbolp l) (symbol-name l) l))
 842      (or (cdr (assoc lang org-src-lang-modes)) lang)) "-mode")))
 843
 844 (provide 'org-src)
 845
 846 ;;; org-src.el ends here