lisp/ob-tangle.el

   1 ;;; ob-tangle.el --- extract source code from org-mode files
   2
   3 ;; Copyright (C) 2009-2011  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Extract the code from source blocks out into raw source-code files.
  27
  28 ;;; Code:
  29 (require 'ob)
  30 (require 'org-src)
  31 (eval-when-compile
  32   (require 'cl))
  33
  34 (declare-function org-link-escape "org" (text &optional table))
  35 (declare-function org-heading-components "org" ())
  36 (declare-function org-back-to-heading "org" (invisible-ok))
  37 (declare-function org-fill-template "org" (template alist))
  38 (declare-function org-babel-update-block-body "org" (new-body))
  39 (declare-function make-directory "files" (dir &optional parents))
  40
  41 ;;;###autoload
  42 (defcustom org-babel-tangle-lang-exts
  43   '(("emacs-lisp" . "el"))
  44   "Alist mapping languages to their file extensions.
  45 The key is the language name, the value is the string that should
  46 be inserted as the extension commonly used to identify files
  47 written in this language.  If no entry is found in this list,
  48 then the name of the language is used."
  49   :group 'org-babel-tangle
  50   :type '(repeat
  51           (cons
  52            (string "Language name")
  53            (string "File Extension"))))
  54
  55 (defcustom org-babel-post-tangle-hook nil
  56   "Hook run in code files tangled by `org-babel-tangle'."
  57   :group 'org-babel
  58   :type 'hook)
  59
  60 (defcustom org-babel-pre-tangle-hook '(save-buffer)
  61   "Hook run at the beginning of `org-babel-tangle'."
  62   :group 'org-babel
  63   :type 'hook)
  64
  65 (defcustom org-babel-tangle-body-hook nil
  66   "Hook run over the contents of each code block body."
  67   :group 'org-babel
  68   :type 'hook)
  69
  70 (defcustom org-babel-tangle-comment-format-beg "[[%link][%source-name]]"
  71   "Format of inserted comments in tangled code files.
  72 The following format strings can be used to insert special
  73 information into the output using `org-fill-template'.
  74 %start-line --- the line number at the start of the code block
  75 %file --------- the file from which the code block was tangled
  76 %link --------- Org-mode style link to the code block
  77 %source-name -- name of the code block
  78
  79 Whether or not comments are inserted during tangling is
  80 controlled by the :comments header argument."
  81   :group 'org-babel
  82   :type 'string)
  83
  84 (defcustom org-babel-tangle-comment-format-end "%source-name ends here"
  85   "Format of inserted comments in tangled code files.
  86 The following format strings can be used to insert special
  87 information into the output using `org-fill-template'.
  88 %start-line --- the line number at the start of the code block
  89 %file --------- the file from which the code block was tangled
  90 %link --------- Org-mode style link to the code block
  91 %source-name -- name of the code block
  92
  93 Whether or not comments are inserted during tangling is
  94 controlled by the :comments header argument."
  95   :group 'org-babel
  96   :type 'string)
  97
  98 (defun org-babel-find-file-noselect-refresh (file)
  99   "Find file ensuring that the latest changes on disk are
 100 represented in the file."
 101   (find-file-noselect file)
 102   (with-current-buffer (get-file-buffer file)
 103     (revert-buffer t t t)))
 104
 105 (defmacro org-babel-with-temp-filebuffer (file &rest body)
 106   "Open FILE into a temporary buffer execute BODY there like
 107 `progn', then kill the FILE buffer returning the result of
 108 evaluating BODY."
 109   (declare (indent 1))
 110   (let ((temp-result (make-symbol "temp-result"))
 111         (temp-file (make-symbol "temp-file"))
 112         (visited-p (make-symbol "visited-p")))
 113     `(let (,temp-result ,temp-file
 114            (,visited-p (get-file-buffer ,file)))
 115        (org-babel-find-file-noselect-refresh ,file)
 116        (setf ,temp-file (get-file-buffer ,file))
 117        (with-current-buffer ,temp-file
 118          (setf ,temp-result (progn ,@body)))
 119        (unless ,visited-p (kill-buffer ,temp-file))
 120        ,temp-result)))
 121 (def-edebug-spec org-babel-with-temp-filebuffer (form body))
 122
 123 ;;;###autoload
 124 (defun org-babel-load-file (file)
 125   "Load Emacs Lisp source code blocks in the Org-mode FILE.
 126 This function exports the source code using
 127 `org-babel-tangle' and then loads the resulting file using
 128 `load-file'."
 129   (interactive "fFile to load: ")
 130   (flet ((age (file)
 131               (float-time
 132                (time-subtract (current-time)
 133                               (nth 5 (or (file-attributes (file-truename file))
 134                                          (file-attributes file)))))))
 135     (let* ((base-name (file-name-sans-extension file))
 136            (exported-file (concat base-name ".el")))
 137       ;; tangle if the org-mode file is newer than the elisp file
 138       (unless (and (file-exists-p exported-file)
 139                    (> (age file) (age exported-file)))
 140         (org-babel-tangle-file file exported-file "emacs-lisp"))
 141       (load-file exported-file)
 142       (message "loaded %s" exported-file))))
 143
 144 ;;;###autoload
 145 (defun org-babel-tangle-file (file &optional target-file lang)
 146   "Extract the bodies of source code blocks in FILE.
 147 Source code blocks are extracted with `org-babel-tangle'.
 148 Optional argument TARGET-FILE can be used to specify a default
 149 export file for all source blocks.  Optional argument LANG can be
 150 used to limit the exported source code blocks by language."
 151   (interactive "fFile to tangle: \nP")
 152   (let ((visited-p (get-file-buffer (expand-file-name file)))
 153         to-be-removed)
 154     (save-window-excursion
 155       (find-file file)
 156       (setq to-be-removed (current-buffer))
 157       (org-babel-tangle nil target-file lang))
 158     (unless visited-p
 159       (kill-buffer to-be-removed))))
 160
 161 (defun org-babel-tangle-publish (_ filename pub-dir)
 162   "Tangle FILENAME and place the results in PUB-DIR."
 163   (mapc (lambda (el) (copy-file el pub-dir t)) (org-babel-tangle-file filename)))
 164
 165 ;;;###autoload
 166 (defun org-babel-tangle (&optional only-this-block target-file lang)
 167   "Write code blocks to source-specific files.
 168 Extract the bodies of all source code blocks from the current
 169 file into their own source-specific files.  Optional argument
 170 TARGET-FILE can be used to specify a default export file for all
 171 source blocks.  Optional argument LANG can be used to limit the
 172 exported source code blocks by language."
 173   (interactive "P")
 174   (run-hooks 'org-babel-pre-tangle-hook)
 175   ;; possibly restrict the buffer to the current code block
 176   (save-restriction
 177   (when only-this-block
 178     (unless (org-babel-where-is-src-block-head)
 179       (error "Point is not currently inside of a code block"))
 180     (unless target-file
 181       (setq target-file
 182             (read-from-minibuffer "Tangle to: " (buffer-file-name))))
 183     (narrow-to-region (match-beginning 0) (match-end 0)))
 184   (save-excursion
 185     (let ((block-counter 0)
 186           (org-babel-default-header-args
 187            (if target-file
 188                (org-babel-merge-params org-babel-default-header-args
 189                                        (list (cons :tangle target-file)))
 190              org-babel-default-header-args))
 191           path-collector)
 192       (mapc ;; map over all languages
 193        (lambda (by-lang)
 194          (let* ((lang (car by-lang))
 195                 (specs (cdr by-lang))
 196                 (ext (or (cdr (assoc lang org-babel-tangle-lang-exts)) lang))
 197                 (lang-f (intern
 198                          (concat
 199                           (or (and (cdr (assoc lang org-src-lang-modes))
 200                                    (symbol-name
 201                                     (cdr (assoc lang org-src-lang-modes))))
 202                               lang)
 203                           "-mode")))
 204                 she-banged)
 205            (mapc
 206             (lambda (spec)
 207               (flet ((get-spec (name)
 208                                (cdr (assoc name (nth 4 spec)))))
 209                 (let* ((tangle (get-spec :tangle))
 210                        (she-bang ((lambda (sheb) (when (> (length sheb) 0) sheb))
 211                                   (get-spec :shebang)))
 212                        (base-name (cond
 213                                    ((string= "yes" tangle)
 214                                     (file-name-sans-extension
 215                                      (buffer-file-name)))
 216                                    ((string= "no" tangle) nil)
 217                                    ((> (length tangle) 0) tangle)))
 218                        (file-name (when base-name
 219                                     ;; decide if we want to add ext to base-name
 220                                     (if (and ext (string= "yes" tangle))
 221                                         (concat base-name "." ext) base-name))))
 222                   (when file-name
 223                     ;; possibly create the parent directories for file
 224                     (when ((lambda (m) (and m (not (string= m "no"))))
 225                            (get-spec :mkdirp))
 226                       (make-directory (file-name-directory file-name) 'parents))
 227                     ;; delete any old versions of file
 228                     (when (and (file-exists-p file-name)
 229                                (not (member file-name path-collector)))
 230                       (delete-file file-name))
 231                     ;; drop source-block to file
 232                     (with-temp-buffer
 233                       (when (fboundp lang-f) (ignore-errors (funcall lang-f)))
 234                       (when (and she-bang (not (member file-name she-banged)))
 235                         (insert (concat she-bang "\n"))
 236                         (setq she-banged (cons file-name she-banged)))
 237                       (org-babel-spec-to-string spec)
 238                       ;; We avoid append-to-file as it does not work with tramp.
 239                       (let ((content (buffer-string)))
 240                         (with-temp-buffer
 241                           (if (file-exists-p file-name)
 242                               (insert-file-contents file-name))
 243                           (goto-char (point-max))
 244                           (insert content)
 245                           (write-region nil nil file-name))))
 246                     ;; if files contain she-bangs, then make the executable
 247                     (when she-bang (set-file-modes file-name #o755))
 248                     ;; update counter
 249                     (setq block-counter (+ 1 block-counter))
 250                     (add-to-list 'path-collector file-name)))))
 251             specs)))
 252        (org-babel-tangle-collect-blocks lang))
 253       (message "tangled %d code block%s from %s" block-counter
 254                (if (= block-counter 1) "" "s")
 255                (file-name-nondirectory
 256                 (buffer-file-name (or (buffer-base-buffer) (current-buffer)))))
 257       ;; run `org-babel-post-tangle-hook' in all tangled files
 258       (when org-babel-post-tangle-hook
 259         (mapc
 260          (lambda (file)
 261            (org-babel-with-temp-filebuffer file
 262              (run-hooks 'org-babel-post-tangle-hook)))
 263          path-collector))
 264       path-collector))))
 265
 266 (defun org-babel-tangle-clean ()
 267   "Remove comments inserted by `org-babel-tangle'.
 268 Call this function inside of a source-code file generated by
 269 `org-babel-tangle' to remove all comments inserted automatically
 270 by `org-babel-tangle'.  Warning, this comment removes any lines
 271 containing constructs which resemble org-mode file links or noweb
 272 references."
 273   (interactive)
 274   (goto-char (point-min))
 275   (while (or (re-search-forward "\\[\\[file:.*\\]\\[.*\\]\\]" nil t)
 276              (re-search-forward "<<[^[:space:]]*>>" nil t))
 277     (delete-region (save-excursion (beginning-of-line 1) (point))
 278                    (save-excursion (end-of-line 1) (forward-char 1) (point)))))
 279
 280 (defvar org-stored-links)
 281 (defvar org-bracket-link-regexp)
 282 (defun org-babel-tangle-collect-blocks (&optional language)
 283   "Collect source blocks in the current Org-mode file.
 284 Return an association list of source-code block specifications of
 285 the form used by `org-babel-spec-to-string' grouped by language.
 286 Optional argument LANG can be used to limit the collected source
 287 code blocks by language."
 288   (let ((block-counter 1) (current-heading "") blocks)
 289     (org-babel-map-src-blocks (buffer-file-name)
 290       ((lambda (new-heading)
 291          (if (not (string= new-heading current-heading))
 292              (progn
 293                (setq block-counter 1)
 294                (setq current-heading new-heading))
 295            (setq block-counter (+ 1 block-counter))))
 296        (replace-regexp-in-string "[ \t]" "-"
 297                                  (condition-case nil
 298                                      (nth 4 (org-heading-components))
 299                                    (error (buffer-file-name)))))
 300       (let* ((start-line (save-restriction (widen)
 301                                            (+ 1 (line-number-at-pos (point)))))
 302              (file (buffer-file-name))
 303              (info (org-babel-get-src-block-info 'light))
 304              (src-lang (nth 0 info)))
 305         (unless (string= (cdr (assoc :tangle (nth 2 info))) "no")
 306           (unless (and language (not (string= language src-lang)))
 307             (let* ((info (org-babel-get-src-block-info))
 308                    (params (nth 2 info))
 309                    (link ((lambda (link)
 310                             (and (string-match org-bracket-link-regexp link)
 311                                  (match-string 1 link)))
 312                           (org-babel-clean-text-properties
 313                            (org-store-link nil))))
 314                    (source-name
 315                     (intern (or (nth 4 info)
 316                                 (format "%s:%d"
 317                                         current-heading block-counter))))
 318                    (expand-cmd
 319                     (intern (concat "org-babel-expand-body:" src-lang)))
 320                    (assignments-cmd
 321                     (intern (concat "org-babel-variable-assignments:" src-lang)))
 322                    (body
 323                     ((lambda (body) ;; run the tangle-body-hook
 324                        (with-temp-buffer
 325                          (insert body)
 326                          (run-hooks 'org-babel-tangle-body-hook)
 327                          (buffer-string)))
 328                      ((lambda (body) ;; expand the body in language specific manner
 329                         (if (assoc :no-expand params)
 330                             body
 331                           (if (fboundp expand-cmd)
 332                               (funcall expand-cmd body params)
 333                             (org-babel-expand-body:generic
 334                              body params
 335                              (and (fboundp assignments-cmd)
 336                                   (funcall assignments-cmd params))))))
 337                       (if (and (cdr (assoc :noweb params)) ;; expand noweb refs
 338                                (let ((nowebs (split-string
 339                                               (cdr (assoc :noweb params)))))
 340                                  (or (member "yes" nowebs)
 341                                      (member "tangle" nowebs))))
 342                           (org-babel-expand-noweb-references info)
 343                         (nth 1 info)))))
 344                    (comment
 345                     (when (or (string= "both" (cdr (assoc :comments params)))
 346                               (string= "org" (cdr (assoc :comments params))))
 347                       ;; from the previous heading or code-block end
 348                       (buffer-substring
 349                        (max (condition-case nil
 350                                 (save-excursion
 351                                   (org-back-to-heading t) (point))
 352                               (error 0))
 353                             (save-excursion
 354                               (re-search-backward
 355                                org-babel-src-block-regexp nil t)
 356                               (match-end 0)))
 357                        (point))))
 358                    by-lang)
 359               ;; add the spec for this block to blocks under it's language
 360               (setq by-lang (cdr (assoc src-lang blocks)))
 361               (setq blocks (delq (assoc src-lang blocks) blocks))
 362               (setq blocks (cons
 363                             (cons src-lang
 364                                   (cons (list start-line file link
 365                                               source-name params body comment)
 366                                         by-lang)) blocks)))))))
 367     ;; ensure blocks in the correct order
 368     (setq blocks
 369           (mapcar
 370            (lambda (by-lang) (cons (car by-lang) (reverse (cdr by-lang))))
 371            blocks))
 372     blocks))
 373
 374 (defun org-babel-spec-to-string (spec)
 375   "Insert SPEC into the current file.
 376 Insert the source-code specified by SPEC into the current
 377 source code file.  This function uses `comment-region' which
 378 assumes that the appropriate major-mode is set.  SPEC has the
 379 form
 380
 381   (start-line file link source-name params body comment)"
 382   (let* ((start-line (nth 0 spec))
 383          (file (nth 1 spec))
 384          (link (org-link-escape (nth 2 spec)))
 385          (source-name (nth 3 spec))
 386          (body (nth 5 spec))
 387          (comment (nth 6 spec))
 388          (comments (cdr (assoc :comments (nth 4 spec))))
 389          (padline (not (string= "no" (cdr (assoc :padline (nth 4 spec))))))
 390          (link-p (or (string= comments "both") (string= comments "link")
 391                      (string= comments "yes") (string= comments "noweb")))
 392          (link-data (mapcar (lambda (el)
 393                               (cons (symbol-name el)
 394                                     ((lambda (le)
 395                                        (if (stringp le) le (format "%S" le)))
 396                                      (eval el))))
 397                             '(start-line file link source-name))))
 398     (flet ((insert-comment (text)
 399             (let ((text (org-babel-trim text)))
 400               (when (and comments (not (string= comments "no"))
 401                          (> (length text) 0))
 402                 (when padline (insert "\n"))
 403                 (comment-region (point) (progn (insert text) (point)))
 404                 (end-of-line nil) (insert "\n")))))
 405       (when comment (insert-comment comment))
 406       (when link-p
 407         (insert-comment
 408          (org-fill-template org-babel-tangle-comment-format-beg link-data)))
 409       (when padline (insert "\n"))
 410       (insert
 411        (format
 412         "%s\n"
 413         (replace-regexp-in-string
 414          "^," ""
 415          (org-babel-trim body (if org-src-preserve-indentation "[\f\n\r\v]")))))
 416       (when link-p
 417         (insert-comment
 418          (org-fill-template org-babel-tangle-comment-format-end link-data))))))
 419
 420 (defun org-babel-tangle-comment-links ( &optional info)
 421   "Return a list of begin and end link comments for the code block at point."
 422   (let* ((start-line (org-babel-where-is-src-block-head))
 423          (file (buffer-file-name))
 424          (link (org-link-escape (progn (call-interactively 'org-store-link)
 425                                        (org-babel-clean-text-properties
 426                                         (car (pop org-stored-links))))))
 427          (source-name (nth 4 (or info (org-babel-get-src-block-info 'light))))
 428          (link-data (mapcar (lambda (el)
 429                               (cons (symbol-name el)
 430                                     ((lambda (le)
 431                                        (if (stringp le) le (format "%S" le)))
 432                                      (eval el))))
 433                             '(start-line file link source-name))))
 434     (list (org-fill-template org-babel-tangle-comment-format-beg link-data)
 435           (org-fill-template org-babel-tangle-comment-format-end link-data))))
 436
 437 ;; de-tangling functions
 438 (defvar org-bracket-link-analytic-regexp)
 439 (defun org-babel-detangle (&optional source-code-file)
 440   "Propagate changes in source file back original to Org-mode file.
 441 This requires that code blocks were tangled with link comments
 442 which enable the original code blocks to be found."
 443   (interactive)
 444   (save-excursion
 445     (when source-code-file (find-file source-code-file))
 446     (goto-char (point-min))
 447     (let ((counter 0) new-body end)
 448       (while (re-search-forward org-bracket-link-analytic-regexp nil t)
 449         (when (re-search-forward
 450                (concat " " (regexp-quote (match-string 5)) " ends here"))
 451           (setq end (match-end 0))
 452           (forward-line -1)
 453           (save-excursion
 454             (when (setq new-body (org-babel-tangle-jump-to-org))
 455               (org-babel-update-block-body new-body)))
 456           (setq counter (+ 1 counter)))
 457         (goto-char end))
 458       (prog1 counter (message "detangled %d code blocks" counter)))))
 459
 460 (defun org-babel-tangle-jump-to-org ()
 461   "Jump from a tangled code file to the related Org-mode file."
 462   (interactive)
 463   (let ((mid (point))
 464         start end done
 465         target-buffer target-char link path block-name body)
 466     (save-window-excursion
 467       (save-excursion
 468         (while (and (re-search-backward org-bracket-link-analytic-regexp nil t)
 469                     (not ; ever wider searches until matching block comments
 470                      (and (setq start (point-at-eol))
 471                           (setq link (match-string 0))
 472                           (setq path (match-string 3))
 473                           (setq block-name (match-string 5))
 474                           (save-excursion
 475                             (save-match-data
 476                               (re-search-forward
 477                                (concat " " (regexp-quote block-name)
 478                                        " ends here") nil t)
 479                               (setq end (point-at-bol))))))))
 480         (unless (and start (< start mid) (< mid end))
 481           (error "not in tangled code"))
 482         (setq body (org-babel-trim (buffer-substring start end))))
 483       (when (string-match "::" path)
 484         (setq path (substring path 0 (match-beginning 0))))
 485       (find-file path) (setq target-buffer (current-buffer))
 486       (goto-char start) (org-open-link-from-string link)
 487       (if (string-match "[^ \t\n\r]:\\([[:digit:]]+\\)" block-name)
 488           (org-babel-next-src-block
 489            (string-to-number (match-string 1 block-name)))
 490         (org-babel-goto-named-src-block block-name))
 491       (setq target-char (point)))
 492     (pop-to-buffer target-buffer)
 493     (prog1 body (goto-char target-char))))
 494
 495 (provide 'ob-tangle)
 496
 497
 498
 499 ;;; ob-tangle.el ends here