lisp/org-src.el

   1 ;;; org-src.el --- Source code examples in Org
   2 ;;
   3 ;; Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
   4 ;;   Free Software Foundation, Inc.
   5 ;;
   6 ;; Author: Carsten Dominik <carsten at orgmode dot org>
   7 ;;         Bastien Guerry <bzg AT altern DOT org>
   8 ;;         Dan Davison <davison at stats dot ox dot ac dot uk>
   9 ;; Keywords: outlines, hypermedia, calendar, wp
  10 ;; Homepage: http://orgmode.org
  11 ;; Version: 7.3
  12 ;;
  13 ;; This file is part of GNU Emacs.
  14 ;;
  15 ;; GNU Emacs is free software: you can redistribute it and/or modify
  16 ;; it under the terms of the GNU General Public License as published by
  17 ;; the Free Software Foundation, either version 3 of the License, or
  18 ;; (at your option) any later version.
  19
  20 ;; GNU Emacs is distributed in the hope that it will be useful,
  21 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 ;; GNU General Public License for more details.
  24
  25 ;; You should have received a copy of the GNU General Public License
  26 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  27 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  28 ;;
  29 ;;; Commentary:
  30
  31 ;; This file contains the code dealing with source code examples in Org-mode.
  32
  33 ;;; Code:
  34
  35 (require 'org-macs)
  36 (require 'org-compat)
  37 (require 'ob-keys)
  38 (require 'ob-comint)
  39 (eval-when-compile
  40   (require 'cl))
  41
  42 (declare-function org-do-remove-indentation "org" (&optional n))
  43 (declare-function org-at-table.el-p "org" ())
  44 (declare-function org-get-indentation "org" (&optional line))
  45 (declare-function org-switch-to-buffer-other-window "org" (&rest args))
  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 When nil, the message will only be shown intermittently in the echo area."
 121   :group 'org-edit-structure
 122   :type 'boolean)
 123
 124 (defcustom org-src-window-setup 'reorganize-frame
 125   "How the source code edit buffer should be displayed.
 126 Possible values for this option are:
 127
 128 current-window    Show edit buffer in the current window, keeping all other
 129                   windows.
 130 other-window      Use `switch-to-buffer-other-window' to display edit buffer.
 131 reorganize-frame  Show only two windows on the current frame, the current
 132                   window and the edit buffer. When exiting the edit buffer,
 133                   return to one window.
 134 other-frame       Use `switch-to-buffer-other-frame' to display edit buffer.
 135                   Also, when exiting the edit buffer, kill that frame."
 136   :group 'org-edit-structure
 137   :type '(choice
 138           (const current-window)
 139           (const other-frame)
 140           (const other-window)
 141           (const reorganize-frame)))
 142
 143 (defvar org-src-mode-hook nil
 144   "Hook  run after Org switched a source code snippet to its Emacs mode.
 145 This hook will run
 146
 147 - when editing a source code snippet with \"C-c '\".
 148 - When formatting a source code snippet for export with htmlize.
 149
 150 You may want to use this hook for example to turn off `outline-minor-mode'
 151 or similar things which you want to have when editing a source code file,
 152 but which mess up the display of a snippet in Org exported files.")
 153
 154 (defcustom org-src-lang-modes
 155   '(("ocaml" . tuareg) ("elisp" . emacs-lisp) ("ditaa" . artist)
 156     ("asymptote" . asy) ("dot" . fundamental) ("sqlite" . sql)
 157     ("calc" . fundamental))
 158   "Alist mapping languages to their major mode.
 159 The key is the language name, the value is the string that should
 160 be inserted as the name of the major mode.  For many languages this is
 161 simple, but for language where this is not the case, this variable
 162 provides a way to simplify things on the user side.
 163 For example, there is no ocaml-mode in Emacs, but the mode to use is
 164 `tuareg-mode'."
 165   :group 'org-edit-structure
 166   :type '(repeat
 167           (cons
 168            (string "Language name")
 169            (symbol "Major mode"))))
 170
 171 ;;; Editing source examples
 172
 173 (defvar org-src-mode-map (make-sparse-keymap))
 174 (define-key org-src-mode-map "\C-c'" 'org-edit-src-exit)
 175
 176 (defvar org-edit-src-force-single-line nil)
 177 (defvar org-edit-src-from-org-mode nil)
 178 (defvar org-edit-src-allow-write-back-p t)
 179 (defvar org-edit-src-picture nil)
 180 (defvar org-edit-src-beg-marker nil)
 181 (defvar org-edit-src-end-marker nil)
 182 (defvar org-edit-src-overlay nil)
 183 (defvar org-edit-src-block-indentation nil)
 184 (defvar org-edit-src-saved-temp-window-config nil)
 185
 186 (defvar org-src-ask-before-returning-to-edit-buffer t
 187   "If nil, when org-edit-src code is used on a block that already
 188   has an active edit buffer, it will switch to that edit buffer
 189   immediately; otherwise it will ask whether you want to return
 190   to the existing edit buffer.")
 191
 192 (defvar org-src-babel-info nil)
 193
 194 (define-minor-mode org-src-mode
 195   "Minor mode for language major mode buffers generated by org.
 196 This minor mode is turned on in two situations:
 197 - when editing a source code snippet with \"C-c '\".
 198 - When formatting a source code snippet for export with htmlize.
 199 There is a mode hook, and keybindings for `org-edit-src-exit' and
 200 `org-edit-src-save'")
 201
 202 (defun org-edit-src-code (&optional context code edit-buffer-name quietp)
 203   "Edit the source code example at point.
 204 The example is copied to a separate buffer, and that buffer is
 205 switched to the correct language mode.  When done, exit with
 206 \\[org-edit-src-exit].  This will remove the original code in the
 207 Org buffer, and replace it with the edited version. Optional
 208 argument CONTEXT is used by \\[org-edit-src-save] when calling
 209 this function. See \\[org-src-window-setup] to configure the
 210 display of windows containing the Org buffer and the code
 211 buffer."
 212   (interactive)
 213   (unless (eq context 'save)
 214     (setq org-edit-src-saved-temp-window-config (current-window-configuration)))
 215   (let ((mark (and (org-region-active-p) (mark)))
 216         (case-fold-search t)
 217         (info (org-edit-src-find-region-and-lang))
 218         (babel-info (org-babel-get-src-block-info 'light))
 219         (org-mode-p (eq major-mode 'org-mode))
 220         (beg (make-marker))
 221         (end (make-marker))
 222         (preserve-indentation org-src-preserve-indentation)
 223         (allow-write-back-p (null code))
 224         block-nindent total-nindent ovl lang lang-f single lfmt buffer msg
 225         begline markline markcol line col)
 226     (if (not info)
 227         nil
 228       (setq beg (move-marker beg (nth 0 info))
 229             end (move-marker end (nth 1 info))
 230             msg (if allow-write-back-p
 231                     (substitute-command-keys
 232                      "Edit, then exit with C-c ' (C-c and single quote)")
 233                   "Exit with C-c ' (C-c and single quote)")
 234             code (or code (buffer-substring-no-properties beg end))
 235             lang (or (cdr (assoc (nth 2 info) org-src-lang-modes))
 236                      (nth 2 info))
 237             lang (if (symbolp lang) (symbol-name lang) lang)
 238             single (nth 3 info)
 239             lfmt (nth 4 info)
 240             block-nindent (nth 5 info)
 241             lang-f (intern (concat lang "-mode"))
 242             begline (save-excursion (goto-char beg) (org-current-line)))
 243       (if (and mark (>= mark beg) (<= mark end))
 244           (save-excursion (goto-char mark)
 245                           (setq markline (org-current-line)
 246                                 markcol (current-column))))
 247       (if (equal lang-f 'table.el-mode)
 248           (setq lang-f (lambda ()
 249                          (text-mode)
 250                          (if (org-bound-and-true-p flyspell-mode)
 251                              (flyspell-mode -1))
 252                          (table-recognize)
 253                          (org-set-local 'org-edit-src-content-indentation 0))))
 254       (unless (functionp lang-f)
 255         (error "No such language mode: %s" lang-f))
 256       (save-excursion
 257         (if (> (point) end) (goto-char end))
 258         (setq line (org-current-line)
 259               col (current-column)))
 260       (if (and (setq buffer (org-edit-src-find-buffer beg end))
 261                (if org-src-ask-before-returning-to-edit-buffer
 262                    (y-or-n-p "Return to existing edit buffer? [n] will revert changes: ") t))
 263           (org-src-switch-to-buffer buffer 'return)
 264         (when buffer
 265           (with-current-buffer buffer
 266             (if (boundp 'org-edit-src-overlay)
 267                 (delete-overlay org-edit-src-overlay)))
 268           (kill-buffer buffer))
 269         (setq buffer (generate-new-buffer
 270                       (or edit-buffer-name
 271                           (org-src-construct-edit-buffer-name (buffer-name) lang))))
 272         (setq ovl (make-overlay beg end))
 273         (overlay-put ovl 'edit-buffer buffer)
 274         (overlay-put ovl 'help-echo "Click with mouse-1 to switch to buffer editing this segment")
 275         (overlay-put ovl 'face 'secondary-selection)
 276         (overlay-put ovl
 277                      'keymap
 278                      (let ((map (make-sparse-keymap)))
 279                        (define-key map [mouse-1] 'org-edit-src-continue)
 280                        map))
 281         (overlay-put ovl :read-only "Leave me alone")
 282         (org-src-switch-to-buffer buffer 'edit)
 283         (if (eq single 'macro-definition)
 284             (setq code (replace-regexp-in-string "\\\\n" "\n" code t t)))
 285         (insert code)
 286         (remove-text-properties (point-min) (point-max)
 287                                 '(display nil invisible nil intangible nil))
 288         (unless preserve-indentation
 289           (setq total-nindent (or (org-do-remove-indentation) 0)))
 290         (let ((org-inhibit-startup t))
 291           (condition-case e
 292               (funcall lang-f)
 293             (error
 294              (error "Language mode `%s' fails with: %S" lang-f (nth 1 e)))))
 295         (set (make-local-variable 'org-edit-src-force-single-line) single)
 296         (set (make-local-variable 'org-edit-src-from-org-mode) org-mode-p)
 297         (set (make-local-variable 'org-edit-src-allow-write-back-p) allow-write-back-p)
 298         (set (make-local-variable 'org-src-preserve-indentation) preserve-indentation)
 299         (when babel-info
 300           (set (make-local-variable 'org-src-babel-info) babel-info))
 301         (when lfmt
 302           (set (make-local-variable 'org-coderef-label-format) lfmt))
 303         (when org-mode-p
 304           (goto-char (point-min))
 305           (while (re-search-forward "^," nil t)
 306             (if (eq (org-current-line) line) (setq total-nindent (1+ total-nindent)))
 307             (replace-match "")))
 308         (when markline
 309           (org-goto-line (1+ (- markline begline)))
 310           (org-move-to-column
 311            (if preserve-indentation markcol (max 0 (- markcol total-nindent))))
 312           (push-mark (point) 'no-message t)
 313           (setq deactivate-mark nil))
 314         (org-goto-line (1+ (- line begline)))
 315         (org-move-to-column
 316          (if preserve-indentation col (max 0 (- col total-nindent))))
 317         (org-set-local 'org-edit-src-beg-marker beg)
 318         (org-set-local 'org-edit-src-end-marker end)
 319         (org-set-local 'org-edit-src-overlay ovl)
 320         (org-set-local 'org-edit-src-block-indentation block-nindent)
 321         (org-src-mode)
 322         (set-buffer-modified-p nil)
 323         (and org-edit-src-persistent-message
 324              (org-set-local 'header-line-format msg)))
 325       (unless quietp (message "%s" msg))
 326       t)))
 327
 328 (defun org-edit-src-continue (e)
 329   (interactive "e")
 330   (mouse-set-point e)
 331   (let ((buf (get-char-property (point) 'edit-buffer)))
 332     (if buf (org-src-switch-to-buffer buf 'continue)
 333       (error "Something is wrong here"))))
 334
 335 (defun org-src-switch-to-buffer (buffer context)
 336   (case org-src-window-setup
 337     ('current-window
 338      (switch-to-buffer buffer))
 339     ('other-window
 340      (switch-to-buffer-other-window buffer))
 341     ('other-frame
 342      (case context
 343        ('exit
 344         (let ((frame (selected-frame)))
 345           (switch-to-buffer-other-frame buffer)
 346           (delete-frame frame)))
 347        ('save
 348         (kill-buffer (current-buffer))
 349         (switch-to-buffer buffer))
 350        (t
 351         (switch-to-buffer-other-frame buffer))))
 352     ('reorganize-frame
 353      (if (eq context 'edit) (delete-other-windows))
 354      (org-switch-to-buffer-other-window buffer)
 355      (if (eq context 'exit) (delete-other-windows)))
 356     ('switch-invisibly
 357      (set-buffer buffer))
 358     (t
 359      (message "Invalid value %s for org-src-window-setup"
 360               (symbol-name org-src-window-setup))
 361      (switch-to-buffer buffer))))
 362
 363 (defun org-src-construct-edit-buffer-name (org-buffer-name lang)
 364   "Construct the buffer name for a source editing buffer."
 365   (concat "*Org Src " org-buffer-name "[ " lang " ]*"))
 366
 367 (defun org-edit-src-find-buffer (beg end)
 368   "Find a source editing buffer that is already editing the region BEG to END."
 369   (catch 'exit
 370     (mapc
 371      (lambda (b)
 372        (with-current-buffer b
 373          (if (and (string-match "\\`*Org Src " (buffer-name))
 374                   (local-variable-p 'org-edit-src-beg-marker (current-buffer))
 375                   (local-variable-p 'org-edit-src-end-marker (current-buffer))
 376                   (equal beg org-edit-src-beg-marker)
 377                   (equal end org-edit-src-end-marker))
 378              (throw 'exit (current-buffer)))))
 379      (buffer-list))
 380     nil))
 381
 382 (defun org-edit-fixed-width-region ()
 383   "Edit the fixed-width ascii drawing at point.
 384 This must be a region where each line starts with a colon followed by
 385 a space character.
 386 An new buffer is created and the fixed-width region is copied into it,
 387 and the buffer is switched into `artist-mode' for editing.  When done,
 388 exit with \\[org-edit-src-exit].  The edited text will then replace
 389 the fragment in the Org-mode buffer."
 390   (interactive)
 391   (let ((line (org-current-line))
 392         (col (current-column))
 393         (case-fold-search t)
 394         (msg (substitute-command-keys
 395               "Edit, then exit with C-c ' (C-c and single quote)"))
 396         (org-mode-p (eq major-mode 'org-mode))
 397         (beg (make-marker))
 398         (end (make-marker))
 399         (preserve-indentation org-src-preserve-indentation)
 400         block-nindent ovl beg1 end1 code begline buffer)
 401     (beginning-of-line 1)
 402     (if (looking-at "[ \t]*[^:\n \t]")
 403         nil
 404       (if (looking-at "[ \t]*\\(\n\\|\\'\\)")
 405           (setq beg1 (point) end1 beg1)
 406         (save-excursion
 407           (if (re-search-backward "^[ \t]*[^: \t]" nil 'move)
 408               (setq beg1 (point-at-bol 2))
 409             (setq beg1 (point))))
 410         (save-excursion
 411           (if (re-search-forward "^[ \t]*[^: \t]" nil 'move)
 412               (setq end1 (1- (match-beginning 0)))
 413             (setq end1 (point))))
 414         (org-goto-line line))
 415       (setq beg (move-marker beg beg1)
 416             end (move-marker end end1)
 417             code (buffer-substring-no-properties beg end)
 418             begline (save-excursion (goto-char beg) (org-current-line)))
 419       (if (and (setq buffer (org-edit-src-find-buffer beg end))
 420                (y-or-n-p "Return to existing edit buffer? [n] will revert changes: "))
 421           (switch-to-buffer buffer)
 422         (when buffer
 423           (with-current-buffer buffer
 424             (if (boundp 'org-edit-src-overlay)
 425                 (delete-overlay org-edit-src-overlay)))
 426           (kill-buffer buffer))
 427         (setq buffer (generate-new-buffer
 428                       (org-src-construct-edit-buffer-name
 429                        (buffer-name) "Fixed Width")))
 430         (setq ovl (make-overlay beg end))
 431         (overlay-put ovl 'face 'secondary-selection)
 432         (overlay-put ovl 'edit-buffer buffer)
 433         (overlay-put ovl 'help-echo "Click with mouse-1 to switch to buffer editing this segment")
 434         (overlay-put ovl 'face 'secondary-selection)
 435         (overlay-put ovl
 436                          'keymap
 437                          (let ((map (make-sparse-keymap)))
 438                            (define-key map [mouse-1] 'org-edit-src-continue)
 439                            map))
 440         (overlay-put ovl :read-only "Leave me alone")
 441         (switch-to-buffer buffer)
 442         (insert code)
 443         (remove-text-properties (point-min) (point-max)
 444                                 '(display nil invisible nil intangible nil))
 445         (setq block-nindent (or (org-do-remove-indentation) 0))
 446         (cond
 447          ((eq org-edit-fixed-width-region-mode 'artist-mode)
 448           (fundamental-mode)
 449           (artist-mode 1))
 450          (t (funcall org-edit-fixed-width-region-mode)))
 451         (set (make-local-variable 'org-edit-src-force-single-line) nil)
 452         (set (make-local-variable 'org-edit-src-from-org-mode) org-mode-p)
 453         (set (make-local-variable 'org-edit-src-picture) t)
 454         (goto-char (point-min))
 455         (while (re-search-forward "^[ \t]*: ?" nil t)
 456           (replace-match ""))
 457         (org-goto-line (1+ (- line begline)))
 458         (org-move-to-column (max 0 (- col block-nindent 2)))
 459         (org-set-local 'org-edit-src-beg-marker beg)
 460         (org-set-local 'org-edit-src-end-marker end)
 461         (org-set-local 'org-edit-src-overlay ovl)
 462         (org-set-local 'org-edit-src-block-indentation block-nindent)
 463         (org-set-local 'org-edit-src-content-indentation 0)
 464         (org-set-local 'org-src-preserve-indentation nil)
 465         (org-src-mode)
 466         (set-buffer-modified-p nil)
 467         (and org-edit-src-persistent-message
 468              (org-set-local 'header-line-format msg)))
 469       (message "%s" msg)
 470       t)))
 471
 472 (defun org-edit-src-find-region-and-lang ()
 473   "Find the region and language for a local edit.
 474 Return a list with beginning and end of the region, a string representing
 475 the language, a switch telling if the content should be in a single line."
 476   (let ((re-list
 477          (append
 478           org-edit-src-region-extra
 479           '(
 480             ("<src\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</src>" lang)
 481             ("<literal\\>[^<]*>[ \t]*\n?" "\n?[ \t]*</literal>" style)
 482             ("<example>[ \t]*\n?" "\n?[ \t]*</example>" "fundamental")
 483             ("<lisp>[ \t]*\n?" "\n?[ \t]*</lisp>" "emacs-lisp")
 484             ("<perl>[ \t]*\n?" "\n?[ \t]*</perl>" "perl")
 485             ("<python>[ \t]*\n?" "\n?[ \t]*</python>" "python")
 486             ("<ruby>[ \t]*\n?" "\n?[ \t]*</ruby>" "ruby")
 487             ("^[ \t]*#\\+begin_src\\( \\([^ \t\n]+\\)\\)?.*\n" "\n[ \t]*#\\+end_src" 2)
 488             ("^[ \t]*#\\+begin_example.*\n" "\n[ \t]*#\\+end_example" "fundamental")
 489             ("^[ \t]*#\\+html:" "\n" "html" single-line)
 490             ("^[ \t]*#\\+begin_html.*\n" "\n[ \t]*#\\+end_html" "html")
 491             ("^[ \t]*#\\+latex:" "\n" "latex" single-line)
 492             ("^[ \t]*#\\+begin_latex.*\n" "\n[ \t]*#\\+end_latex" "latex")
 493             ("^[ \t]*#\\+ascii:" "\n" "fundamental" single-line)
 494             ("^[ \t]*#\\+begin_ascii.*\n" "\n[ \t]*#\\+end_ascii" "fundamental")
 495             ("^[ \t]*#\\+docbook:" "\n" "xml" single-line)
 496             ("^[ \t]*#\\+macro:[ \t]+\\S-+\\( \\|$\\)"
 497              "\n" "fundamental" macro-definition)
 498             ("^[ \t]*#\\+begin_docbook.*\n" "\n[ \t]*#\\+end_docbook" "xml")
 499             )))
 500         (pos (point))
 501         re1 re2 single beg end lang lfmt match-re1 ind entry)
 502     (catch 'exit
 503       (while (setq entry (pop re-list))
 504         (setq re1 (car entry) re2 (nth 1 entry) lang (nth 2 entry)
 505               single (nth 3 entry))
 506         (save-excursion
 507           (if (or (looking-at re1)
 508                   (re-search-backward re1 nil t))
 509               (progn
 510                 (setq match-re1 (match-string 0))
 511                 (setq beg (match-end 0)
 512                       lang (org-edit-src-get-lang lang)
 513                       lfmt (org-edit-src-get-label-format match-re1)
 514                       ind (org-edit-src-get-indentation (match-beginning 0)))
 515                 (if (and (re-search-forward re2 nil t)
 516                          (>= (match-end 0) pos))
 517                     (throw 'exit (list beg (match-beginning 0)
 518                                        lang single lfmt ind))))
 519             (if (or (looking-at re2)
 520                     (re-search-forward re2 nil t))
 521                 (progn
 522                   (setq end (match-beginning 0))
 523                   (if (and (re-search-backward re1 nil t)
 524                            (<= (match-beginning 0) pos))
 525                       (progn
 526                         (setq lfmt (org-edit-src-get-label-format
 527                                     (match-string 0))
 528                               ind (org-edit-src-get-indentation
 529                                    (match-beginning 0)))
 530                         (throw 'exit
 531                                (list (match-end 0) end
 532                                      (org-edit-src-get-lang lang)
 533                                      single lfmt ind)))))))))
 534       (when (org-at-table.el-p)
 535         (re-search-backward "^[\t]*[^ \t|\\+]" nil t)
 536         (setq beg (1+ (point-at-eol)))
 537         (goto-char beg)
 538         (or (re-search-forward "^[\t]*[^ \t|\\+]" nil t)
 539             (progn (goto-char (point-max)) (newline)))
 540         (setq end (point-at-bol))
 541         (setq ind (org-edit-src-get-indentation beg))
 542         (throw 'exit (list beg end 'table.el nil nil ind))))))
 543
 544 (defun org-edit-src-get-lang (lang)
 545   "Extract the src language."
 546   (let ((m (match-string 0)))
 547     (cond
 548      ((stringp lang) lang)
 549      ((integerp lang) (match-string lang))
 550      ((and (eq lang 'lang)
 551            (string-match "\\<lang=\"\\([^ \t\n\"]+\\)\"" m))
 552       (match-string 1 m))
 553      ((and (eq lang 'style)
 554            (string-match "\\<style=\"\\([^ \t\n\"]+\\)\"" m))
 555       (match-string 1 m))
 556      (t "fundamental"))))
 557
 558 (defun org-edit-src-get-label-format (s)
 559   "Extract the label format."
 560   (save-match-data
 561     (if (string-match "-l[ \t]+\\\\?\"\\([^\t\r\n\"]+\\)\\\\?\"" s)
 562         (match-string 1 s))))
 563
 564 (defun org-edit-src-get-indentation (pos)
 565   "Count leading whitespace characters on line."
 566   (save-match-data
 567     (goto-char pos)
 568     (org-get-indentation)))
 569
 570 (defun org-edit-src-exit (&optional context)
 571   "Exit special edit and protect problematic lines."
 572   (interactive)
 573   (unless (org-bound-and-true-p org-edit-src-from-org-mode)
 574     (error "This is not a sub-editing buffer, something is wrong"))
 575   (widen)
 576   (let* ((beg org-edit-src-beg-marker)
 577          (end org-edit-src-end-marker)
 578          (ovl org-edit-src-overlay)
 579          (buffer (current-buffer))
 580          (single (org-bound-and-true-p org-edit-src-force-single-line))
 581          (macro (eq single 'macro-definition))
 582          (total-nindent (+ (or org-edit-src-block-indentation 0)
 583                            org-edit-src-content-indentation))
 584          (preserve-indentation org-src-preserve-indentation)
 585          (allow-write-back-p (org-bound-and-true-p org-edit-src-allow-write-back-p))
 586          (delta 0) code line col indent)
 587     (when allow-write-back-p
 588       (unless preserve-indentation (untabify (point-min) (point-max)))
 589       (if org-src-strip-leading-and-trailing-blank-lines
 590           (save-excursion
 591             (goto-char (point-min))
 592             (if (looking-at "[ \t\n]*\n") (replace-match ""))
 593             (unless macro
 594               (if (re-search-forward "\n[ \t\n]*\\'" nil t) (replace-match ""))))))
 595     (setq line (if (org-bound-and-true-p org-edit-src-force-single-line)
 596                    1
 597                  (org-current-line))
 598           col (current-column))
 599     (when allow-write-back-p
 600       (when single
 601         (goto-char (point-min))
 602         (if (re-search-forward "\\s-+\\'" nil t) (replace-match ""))
 603         (goto-char (point-min))
 604         (let ((cnt 0))
 605           (while (re-search-forward "\n" nil t)
 606             (setq cnt (1+ cnt))
 607             (replace-match (if macro "\\n" " ") t t))
 608           (when (and macro (> cnt 0))
 609             (goto-char (point-max)) (insert "\\n")))
 610         (goto-char (point-min))
 611         (if (looking-at "\\s-*") (replace-match " ")))
 612       (when (org-bound-and-true-p org-edit-src-from-org-mode)
 613         (goto-char (point-min))
 614         (while (re-search-forward
 615                 (if (org-mode-p) "^\\(.\\)" "^\\([*]\\|[ \t]*#\\+\\)") nil t)
 616           (if (eq (org-current-line) line) (setq delta (1+ delta)))
 617           (replace-match ",\\1")))
 618       (when (org-bound-and-true-p org-edit-src-picture)
 619         (setq preserve-indentation nil)
 620         (untabify (point-min) (point-max))
 621         (goto-char (point-min))
 622         (while (re-search-forward "^" nil t)
 623           (replace-match ": ")))
 624       (unless (or single preserve-indentation (= total-nindent 0))
 625         (setq indent (make-string total-nindent ?\ ))
 626         (goto-char (point-min))
 627         (while (re-search-forward "^" nil t)
 628           (replace-match indent)))
 629       (if (org-bound-and-true-p org-edit-src-picture)
 630           (setq total-nindent (+ total-nindent 2)))
 631       (setq code (buffer-string))
 632       (set-buffer-modified-p nil))
 633     (org-src-switch-to-buffer (marker-buffer beg) (or context 'exit))
 634     (kill-buffer buffer)
 635     (goto-char beg)
 636     (when allow-write-back-p
 637       (delete-region beg end)
 638       (insert code)
 639       (goto-char beg)
 640       (if single (just-one-space)))
 641     (if (memq t (mapcar (lambda (overlay)
 642                           (eq (overlay-get overlay 'invisible)
 643                               'org-hide-block))
 644                         (overlays-at (point))))
 645         ;; Block is hidden; put point at start of block
 646         (beginning-of-line 0)
 647       ;; Block is visible, put point where it was in the code buffer
 648       (org-goto-line (1- (+ (org-current-line) line)))
 649       (org-move-to-column (if preserve-indentation col (+ col total-nindent delta))))
 650     (move-marker beg nil)
 651     (move-marker end nil))
 652   (unless (eq context 'save)
 653     (when org-edit-src-saved-temp-window-config
 654       (set-window-configuration org-edit-src-saved-temp-window-config)
 655       (setq org-edit-src-saved-temp-window-config nil))))
 656
 657 (defun org-edit-src-save ()
 658   "Save parent buffer with current state source-code buffer."
 659   (interactive)
 660   (let ((p (point)) (m (mark)) msg)
 661     (save-window-excursion
 662       (org-edit-src-exit 'save)
 663       (save-buffer)
 664       (setq msg (current-message))
 665       (if (eq org-src-window-setup 'other-frame)
 666           (let ((org-src-window-setup 'current-window))
 667             (org-edit-src-code 'save))
 668         (org-edit-src-code 'save)))
 669     (push-mark m 'nomessage)
 670     (goto-char (min p (point-max)))
 671     (message (or msg ""))))
 672
 673 (defun org-src-mode-configure-edit-buffer ()
 674   (when (org-bound-and-true-p org-edit-src-from-org-mode)
 675     (org-add-hook 'kill-buffer-hook
 676                   '(lambda () (delete-overlay org-edit-src-overlay)) nil 'local)
 677     (if (org-bound-and-true-p org-edit-src-allow-write-back-p)
 678         (progn
 679           (setq buffer-offer-save t)
 680           (setq buffer-file-name
 681                 (concat (buffer-file-name (marker-buffer org-edit-src-beg-marker))
 682                         "[" (buffer-name) "]"))
 683           (if (featurep 'xemacs)
 684               (progn
 685                 (make-variable-buffer-local 'write-contents-hooks) ; needed only for 21.4
 686                 (setq write-contents-hooks '(org-edit-src-save)))
 687             (setq write-contents-functions '(org-edit-src-save))))
 688       (setq buffer-read-only t))))
 689
 690 (org-add-hook 'org-src-mode-hook 'org-src-mode-configure-edit-buffer)
 691
 692
 693 (defun org-src-associate-babel-session (info)
 694   "Associate edit buffer with comint session."
 695   (interactive)
 696   (let ((session (cdr (assoc :session (nth 2 info)))))
 697     (and session (not (string= session "none"))
 698          (org-babel-comint-buffer-livep session)
 699          ((lambda (f) (and (fboundp f) (funcall f session)))
 700           (intern (format "org-babel-%s-associate-session" (nth 0 info)))))))
 701
 702 (defun org-src-babel-configure-edit-buffer ()
 703   (when org-src-babel-info
 704     (org-src-associate-babel-session org-src-babel-info)))
 705
 706 (org-add-hook 'org-src-mode-hook 'org-src-babel-configure-edit-buffer)
 707 (defmacro org-src-do-at-code-block (&rest body)
 708   "Execute a command from an edit buffer in the Org-mode buffer."
 709   `(let ((beg-marker org-edit-src-beg-marker))
 710      (if beg-marker
 711          (with-current-buffer (marker-buffer beg-marker)
 712            (goto-char (marker-position beg-marker))
 713            ,@body))))
 714
 715 (defun org-src-do-key-sequence-at-code-block (&optional key)
 716   "Execute key sequence at code block in the source Org buffer.
 717 The command bound to KEY in the Org-babel key map is executed
 718 remotely with point temporarily at the start of the code block in
 719 the Org buffer.
 720
 721 This command is not bound to a key by default, to avoid conflicts
 722 with language major mode bindings. To bind it to C-c @ in all
 723 language major modes, you could use
 724
 725   (add-hook 'org-src-mode-hook
 726             (lambda () (define-key org-src-mode-map \"\\C-c@\"
 727                     'org-src-do-key-sequence-at-code-block)))
 728
 729 In that case, for example, C-c @ t issued in code edit buffers
 730 would tangle the current Org code block, C-c @ e would execute
 731 the block and C-c @ h would display the other available
 732 Org-babel commands."
 733   (interactive "kOrg-babel key: ")
 734   (if (equal key (kbd "C-g")) (keyboard-quit)
 735     (org-edit-src-save)
 736     (org-src-do-at-code-block
 737      (call-interactively
 738       (lookup-key org-babel-map key)))))
 739
 740 (defcustom org-src-tab-acts-natively nil
 741   "If non-nil, the effect of TAB in a code block is as if it were
 742 issued in the language major mode buffer."
 743   :type 'boolean
 744   :group 'org-babel)
 745
 746 (defun org-src-native-tab-command-maybe ()
 747   "Perform language-specific TAB action.
 748 Alter code block according to effect of TAB in the language major
 749 mode."
 750   (and org-src-tab-acts-natively
 751        (let ((org-src-strip-leading-and-trailing-blank-lines nil))
 752          (org-babel-do-key-sequence-in-edit-buffer (kbd "TAB")))))
 753
 754 (add-hook 'org-tab-first-hook 'org-src-native-tab-command-maybe)
 755
 756 (defun org-src-font-lock-fontify-block (lang start end)
 757   "Fontify code block.
 758 This function is called by emacs automatic fontification, as long
 759 as `org-src-fontify-natively' is non-nil. For manual
 760 fontification of code blocks see `org-src-fontify-block' and
 761 `org-src-fontify-buffer'"
 762   (let* ((lang-mode (org-src-get-lang-mode lang))
 763          (string (buffer-substring-no-properties start end))
 764          (modified (buffer-modified-p))
 765          (org-buffer (current-buffer)) pos next)
 766     (remove-text-properties start end '(face nil))
 767     (with-current-buffer
 768         (get-buffer-create
 769          (concat " org-src-fontification:" (symbol-name lang-mode)))
 770       (delete-region (point-min) (point-max))
 771       (insert string)
 772       (unless (eq major-mode lang-mode) (funcall lang-mode))
 773       (font-lock-fontify-buffer)
 774       (setq pos (point-min))
 775       (while (setq next (next-single-property-change pos 'face))
 776         (put-text-property
 777          (+ start (1- pos)) (+ start next) 'face
 778          (get-text-property pos 'face) org-buffer)
 779         (setq pos next)))
 780     (add-text-properties
 781      start end
 782      '(font-lock-fontified t fontified t font-lock-multiline t))
 783     (set-buffer-modified-p modified))
 784   t) ;; Tell `org-fontify-meta-lines-and-blocks' that we fontified
 785
 786 (defun org-src-fontify-block ()
 787   "Fontify code block at point."
 788   (interactive)
 789   (save-excursion
 790     (let ((org-src-fontify-natively t)
 791           (info (org-edit-src-find-region-and-lang)))
 792       (font-lock-fontify-region (nth 0 info) (nth 1 info)))))
 793
 794 (defun org-src-fontify-buffer ()
 795   "Fontify all code blocks in the current buffer"
 796   (interactive)
 797   (org-babel-map-src-blocks nil
 798     (org-src-fontify-block)))
 799
 800 (defun org-src-get-lang-mode (lang)
 801   "Return major mode that should be used for LANG.
 802 LANG is a string, and the returned major mode is a symbol."
 803   (intern
 804    (concat
 805     ((lambda (l) (if (symbolp l) (symbol-name l) l))
 806      (or (cdr (assoc lang org-src-lang-modes)) lang)) "-mode")))
 807
 808 (provide 'org-src)
 809
 810 ;; arch-tag: 6a1fc84f-dec7-47be-a416-64be56bea5d8
 811 ;;; org-src.el ends here