lisp/ob-tangle.el

   1 ;;; ob-tangle.el --- extract source code from org-mode files
   2
   3 ;; Copyright (C) 2009-2013 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 (defcustom org-babel-tangle-lang-exts
  42   '(("emacs-lisp" . "el"))
  43   "Alist mapping languages to their file extensions.
  44 The key is the language name, the value is the string that should
  45 be inserted as the extension commonly used to identify files
  46 written in this language.  If no entry is found in this list,
  47 then the name of the language is used."
  48   :group 'org-babel-tangle
  49   :version "24.1"
  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   :version "24.1"
  59   :type 'hook)
  60
  61 (defcustom org-babel-pre-tangle-hook '(save-buffer)
  62   "Hook run at the beginning of `org-babel-tangle'."
  63   :group 'org-babel
  64   :version "24.1"
  65   :type 'hook)
  66
  67 (defcustom org-babel-tangle-body-hook nil
  68   "Hook run over the contents of each code block body."
  69   :group 'org-babel
  70   :version "24.1"
  71   :type 'hook)
  72
  73 (defcustom org-babel-tangle-comment-format-beg "[[%link][%source-name]]"
  74   "Format of inserted comments in tangled code files.
  75 The following format strings can be used to insert special
  76 information into the output using `org-fill-template'.
  77 %start-line --- the line number at the start of the code block
  78 %file --------- the file from which the code block was tangled
  79 %link --------- Org-mode style link to the code block
  80 %source-name -- name of the code block
  81
  82 Whether or not comments are inserted during tangling is
  83 controlled by the :comments header argument."
  84   :group 'org-babel
  85   :version "24.1"
  86   :type 'string)
  87
  88 (defcustom org-babel-tangle-comment-format-end "%source-name ends here"
  89   "Format of inserted comments in tangled code files.
  90 The following format strings can be used to insert special
  91 information into the output using `org-fill-template'.
  92 %start-line --- the line number at the start of the code block
  93 %file --------- the file from which the code block was tangled
  94 %link --------- Org-mode style link to the code block
  95 %source-name -- name of the code block
  96
  97 Whether or not comments are inserted during tangling is
  98 controlled by the :comments header argument."
  99   :group 'org-babel
 100   :version "24.1"
 101   :type 'string)
 102
 103 (defcustom org-babel-process-comment-text #'org-babel-trim
 104   "Function called to process raw Org-mode text collected to be
 105 inserted as comments in tangled source-code files.  The function
 106 should take a single string argument and return a string
 107 result.  The default value is `org-babel-trim'."
 108   :group 'org-babel
 109   :version "24.1"
 110   :type 'function)
 111
 112 (defun org-babel-find-file-noselect-refresh (file)
 113   "Find file ensuring that the latest changes on disk are
 114 represented in the file."
 115   (find-file-noselect file)
 116   (with-current-buffer (get-file-buffer file)
 117     (revert-buffer t t t)))
 118
 119 (defmacro org-babel-with-temp-filebuffer (file &rest body)
 120   "Open FILE into a temporary buffer execute BODY there like
 121 `progn', then kill the FILE buffer returning the result of
 122 evaluating BODY."
 123   (declare (indent 1))
 124   (let ((temp-path (make-symbol "temp-path"))
 125         (temp-result (make-symbol "temp-result"))
 126         (temp-file (make-symbol "temp-file"))
 127         (visited-p (make-symbol "visited-p")))
 128     `(let* ((,temp-path ,file)
 129             (,visited-p (get-file-buffer ,temp-path))
 130             ,temp-result ,temp-file)
 131        (org-babel-find-file-noselect-refresh ,temp-path)
 132        (setf ,temp-file (get-file-buffer ,temp-path))
 133        (with-current-buffer ,temp-file
 134          (setf ,temp-result (progn ,@body)))
 135        (unless ,visited-p (kill-buffer ,temp-file))
 136        ,temp-result)))
 137 (def-edebug-spec org-babel-with-temp-filebuffer (form body))
 138
 139 ;;;###autoload
 140 (defun org-babel-load-file (file)
 141   "Load Emacs Lisp source code blocks in the Org-mode FILE.
 142 This function exports the source code using
 143 `org-babel-tangle' and then loads the resulting file using
 144 `load-file'."
 145   (interactive "fFile to load: ")
 146   (let* ((age (lambda (file)
 147                 (float-time
 148                  (time-subtract (current-time)
 149                                 (nth 5 (or (file-attributes (file-truename file))
 150                                            (file-attributes file)))))))
 151          (base-name (file-name-sans-extension file))
 152          (exported-file (concat base-name ".el")))
 153     ;; tangle if the org-mode file is newer than the elisp file
 154     (unless (and (file-exists-p exported-file)
 155                  (> (funcall age file) (funcall age exported-file)))
 156       (org-babel-tangle-file file exported-file "emacs-lisp"))
 157     (load-file exported-file)
 158     (message "Loaded %s" exported-file)))
 159
 160 ;;;###autoload
 161 (defun org-babel-tangle-file (file &optional target-file lang)
 162   "Extract the bodies of source code blocks in FILE.
 163 Source code blocks are extracted with `org-babel-tangle'.
 164 Optional argument TARGET-FILE can be used to specify a default
 165 export file for all source blocks.  Optional argument LANG can be
 166 used to limit the exported source code blocks by language."
 167   (interactive "fFile to tangle: \nP")
 168   (let ((visited-p (get-file-buffer (expand-file-name file)))
 169         to-be-removed)
 170     (save-window-excursion
 171       (find-file file)
 172       (setq to-be-removed (current-buffer))
 173       (org-babel-tangle nil target-file lang))
 174     (unless visited-p
 175       (kill-buffer to-be-removed))))
 176
 177 (defun org-babel-tangle-publish (_ filename pub-dir)
 178   "Tangle FILENAME and place the results in PUB-DIR."
 179   (mapc (lambda (el) (copy-file el pub-dir t)) (org-babel-tangle-file filename)))
 180
 181 ;;;###autoload
 182 (defun org-babel-tangle (&optional only-this-block target-file lang)
 183   "Write code blocks to source-specific files.
 184 Extract the bodies of all source code blocks from the current
 185 file into their own source-specific files.  Optional argument
 186 TARGET-FILE can be used to specify a default export file for all
 187 source blocks.  Optional argument LANG can be used to limit the
 188 exported source code blocks by language."
 189   (interactive "P")
 190   (run-hooks 'org-babel-pre-tangle-hook)
 191   ;; possibly restrict the buffer to the current code block
 192   (save-restriction
 193     (when only-this-block
 194       (unless (org-babel-where-is-src-block-head)
 195         (error "Point is not currently inside of a code block"))
 196       (save-match-data
 197         (unless (or (cdr (assoc :tangle (nth 2 (org-babel-get-src-block-info))))
 198                     target-file)
 199           (setq target-file
 200                 (read-from-minibuffer "Tangle to: " (buffer-file-name)))))
 201       (narrow-to-region (match-beginning 0) (match-end 0)))
 202     (save-excursion
 203       (let ((block-counter 0)
 204             (org-babel-default-header-args
 205              (if target-file
 206                  (org-babel-merge-params org-babel-default-header-args
 207                                          (list (cons :tangle target-file)))
 208                org-babel-default-header-args))
 209             path-collector)
 210         (mapc ;; map over all languages
 211          (lambda (by-lang)
 212            (let* ((lang (car by-lang))
 213                   (specs (cdr by-lang))
 214                   (ext (or (cdr (assoc lang org-babel-tangle-lang-exts)) lang))
 215                   (lang-f (intern
 216                            (concat
 217                             (or (and (cdr (assoc lang org-src-lang-modes))
 218                                      (symbol-name
 219                                       (cdr (assoc lang org-src-lang-modes))))
 220                                 lang)
 221                             "-mode")))
 222                   she-banged)
 223              (mapc
 224               (lambda (spec)
 225                 (let ((get-spec (lambda (name) (cdr (assoc name (nth 4 spec))))))
 226                   (let* ((tangle (funcall get-spec :tangle))
 227                          (she-bang ((lambda (sheb) (when (> (length sheb) 0) sheb))
 228                                     (funcall get-spec :shebang)))
 229                          (base-name (cond
 230                                      ((string= "yes" tangle)
 231                                       (file-name-sans-extension
 232                                        (buffer-file-name)))
 233                                      ((string= "no" tangle) nil)
 234                                      ((> (length tangle) 0) tangle)))
 235                          (file-name (when base-name
 236                                       ;; decide if we want to add ext to base-name
 237                                       (if (and ext (string= "yes" tangle))
 238                                           (concat base-name "." ext) base-name))))
 239                     (when file-name
 240                       ;; possibly create the parent directories for file
 241                       (when ((lambda (m) (and m (not (string= m "no"))))
 242                              (funcall get-spec :mkdirp))
 243                         (make-directory (file-name-directory file-name) 'parents))
 244                       ;; delete any old versions of file
 245                       (when (and (file-exists-p file-name)
 246                                  (not (member file-name path-collector)))
 247                         (delete-file file-name))
 248                       ;; drop source-block to file
 249                       (with-temp-buffer
 250                         (when (fboundp lang-f) (ignore-errors (funcall lang-f)))
 251                         (when (and she-bang (not (member file-name she-banged)))
 252                           (insert (concat she-bang "\n"))
 253                           (setq she-banged (cons file-name she-banged)))
 254                         (org-babel-spec-to-string spec)
 255                         ;; We avoid append-to-file as it does not work with tramp.
 256                         (let ((content (buffer-string)))
 257                           (with-temp-buffer
 258                             (if (file-exists-p file-name)
 259                                 (insert-file-contents file-name))
 260                             (goto-char (point-max))
 261                             (insert content)
 262                             (write-region nil nil file-name))))
 263                       ;; if files contain she-bangs, then make the executable
 264                       (when she-bang (set-file-modes file-name #o755))
 265                       ;; update counter
 266                       (setq block-counter (+ 1 block-counter))
 267                       (add-to-list 'path-collector file-name)))))
 268               specs)))
 269          (org-babel-tangle-collect-blocks lang))
 270         (message "Tangled %d code block%s from %s" block-counter
 271                  (if (= block-counter 1) "" "s")
 272                  (file-name-nondirectory
 273                   (buffer-file-name (or (buffer-base-buffer) (current-buffer)))))
 274         ;; run `org-babel-post-tangle-hook' in all tangled files
 275         (when org-babel-post-tangle-hook
 276           (mapc
 277            (lambda (file)
 278              (org-babel-with-temp-filebuffer file
 279                (run-hooks 'org-babel-post-tangle-hook)))
 280            path-collector))
 281         path-collector))))
 282
 283 (defun org-babel-tangle-clean ()
 284   "Remove comments inserted by `org-babel-tangle'.
 285 Call this function inside of a source-code file generated by
 286 `org-babel-tangle' to remove all comments inserted automatically
 287 by `org-babel-tangle'.  Warning, this comment removes any lines
 288 containing constructs which resemble org-mode file links or noweb
 289 references."
 290   (interactive)
 291   (goto-char (point-min))
 292   (while (or (re-search-forward "\\[\\[file:.*\\]\\[.*\\]\\]" nil t)
 293              (re-search-forward (org-babel-noweb-wrap) nil t))
 294     (delete-region (save-excursion (beginning-of-line 1) (point))
 295                    (save-excursion (end-of-line 1) (forward-char 1) (point)))))
 296
 297 (defvar org-stored-links)
 298 (defvar org-bracket-link-regexp)
 299 (defun org-babel-spec-to-string (spec)
 300   "Insert SPEC into the current file.
 301 Insert the source-code specified by SPEC into the current
 302 source code file.  This function uses `comment-region' which
 303 assumes that the appropriate major-mode is set.  SPEC has the
 304 form
 305
 306   (start-line file link source-name params body comment)"
 307   (let* ((start-line (nth 0 spec))
 308          (file (nth 1 spec))
 309          (link (nth 2 spec))
 310          (source-name (nth 3 spec))
 311          (body (nth 5 spec))
 312          (comment (nth 6 spec))
 313          (comments (cdr (assoc :comments (nth 4 spec))))
 314          (padline (not (string= "no" (cdr (assoc :padline (nth 4 spec))))))
 315          (link-p (or (string= comments "both") (string= comments "link")
 316                      (string= comments "yes") (string= comments "noweb")))
 317          (link-data (mapcar (lambda (el)
 318                               (cons (symbol-name el)
 319                                     ((lambda (le)
 320                                        (if (stringp le) le (format "%S" le)))
 321                                      (eval el))))
 322                             '(start-line file link source-name)))
 323          (insert-comment (lambda (text)
 324                            (when (and comments (not (string= comments "no"))
 325                                       (> (length text) 0))
 326                              (when padline (insert "\n"))
 327                              (comment-region (point) (progn (insert text) (point)))
 328                              (end-of-line nil) (insert "\n")))))
 329     (when comment (funcall insert-comment comment))
 330     (when link-p
 331       (funcall
 332        insert-comment
 333        (org-fill-template org-babel-tangle-comment-format-beg link-data)))
 334     (when padline (insert "\n"))
 335     (insert
 336      (format
 337       "%s\n"
 338       (replace-regexp-in-string
 339        "^," ""
 340        (org-babel-trim body (if org-src-preserve-indentation "[\f\n\r\v]")))))
 341     (when link-p
 342       (funcall
 343        insert-comment
 344        (org-fill-template org-babel-tangle-comment-format-end link-data)))))
 345
 346 (defun org-babel-tangle-collect-blocks (&optional language)
 347   "Collect source blocks in the current Org-mode file.
 348 Return an association list of source-code block specifications of
 349 the form used by `org-babel-spec-to-string' grouped by language.
 350 Optional argument LANG can be used to limit the collected source
 351 code blocks by language."
 352   (let ((block-counter 1) (current-heading "") blocks)
 353     (org-babel-map-src-blocks (buffer-file-name)
 354       ((lambda (new-heading)
 355          (if (not (string= new-heading current-heading))
 356              (progn
 357                (setq block-counter 1)
 358                (setq current-heading new-heading))
 359            (setq block-counter (+ 1 block-counter))))
 360        (replace-regexp-in-string "[ \t]" "-"
 361                                  (condition-case nil
 362                                      (or (nth 4 (org-heading-components))
 363                                          "(dummy for heading without text)")
 364                                    (error (buffer-file-name)))))
 365       (let* ((start-line (save-restriction (widen)
 366                                            (+ 1 (line-number-at-pos (point)))))
 367              (file (buffer-file-name))
 368              (info (org-babel-get-src-block-info 'light))
 369              (src-lang (nth 0 info)))
 370         (unless (string= (cdr (assoc :tangle (nth 2 info))) "no")
 371           (unless (and language (not (string= language src-lang)))
 372             (let* ((info (org-babel-get-src-block-info))
 373                    (params (nth 2 info))
 374                    (link ((lambda (link)
 375                             (and (string-match org-bracket-link-regexp link)
 376                                  (match-string 1 link)))
 377                           (org-no-properties
 378                            (org-store-link nil))))
 379                    (source-name
 380                     (intern (or (nth 4 info)
 381                                 (format "%s:%d"
 382                                         current-heading block-counter))))
 383                    (expand-cmd
 384                     (intern (concat "org-babel-expand-body:" src-lang)))
 385                    (assignments-cmd
 386                     (intern (concat "org-babel-variable-assignments:" src-lang)))
 387                    (body
 388                     ((lambda (body) ;; run the tangle-body-hook
 389                        (with-temp-buffer
 390                          (insert body)
 391                          (run-hooks 'org-babel-tangle-body-hook)
 392                          (buffer-string)))
 393                      ((lambda (body) ;; expand the body in language specific manner
 394                         (if (assoc :no-expand params)
 395                             body
 396                           (if (fboundp expand-cmd)
 397                               (funcall expand-cmd body params)
 398                             (org-babel-expand-body:generic
 399                              body params
 400                              (and (fboundp assignments-cmd)
 401                                   (funcall assignments-cmd params))))))
 402                       (if (org-babel-noweb-p params :tangle)
 403                           (org-babel-expand-noweb-references info)
 404                         (nth 1 info)))))
 405                    (comment
 406                     (when (or (string= "both" (cdr (assoc :comments params)))
 407                               (string= "org" (cdr (assoc :comments params))))
 408                       ;; from the previous heading or code-block end
 409                       (funcall
 410                        org-babel-process-comment-text
 411                        (buffer-substring
 412                         (max (condition-case nil
 413                                  (save-excursion
 414                                    (org-back-to-heading t)  ; sets match data
 415                                    (match-end 0))
 416                                (error (point-min)))
 417                              (save-excursion
 418                                (if (re-search-backward
 419                                     org-babel-src-block-regexp nil t)
 420                                    (match-end 0)
 421                                  (point-min))))
 422                         (point)))))
 423                    by-lang)
 424               ;; add the spec for this block to blocks under it's language
 425               (setq by-lang (cdr (assoc src-lang blocks)))
 426               (setq blocks (delq (assoc src-lang blocks) blocks))
 427               (setq blocks (cons
 428                             (cons src-lang
 429                                   (cons (list start-line file link
 430                                               source-name params body comment)
 431                                         by-lang)) blocks)))))))
 432     ;; ensure blocks in the correct order
 433     (setq blocks
 434           (mapcar
 435            (lambda (by-lang) (cons (car by-lang) (reverse (cdr by-lang))))
 436            blocks))
 437     blocks))
 438
 439 (defun org-babel-tangle-comment-links ( &optional info)
 440   "Return a list of begin and end link comments for the code block at point."
 441   (let* ((start-line (org-babel-where-is-src-block-head))
 442          (file (buffer-file-name))
 443          (link (org-link-escape (progn (call-interactively 'org-store-link)
 444                                        (org-no-properties
 445                                         (car (pop org-stored-links))))))
 446          (source-name (nth 4 (or info (org-babel-get-src-block-info 'light))))
 447          (link-data (mapcar (lambda (el)
 448                               (cons (symbol-name el)
 449                                     ((lambda (le)
 450                                        (if (stringp le) le (format "%S" le)))
 451                                      (eval el))))
 452                             '(start-line file link source-name))))
 453     (list (org-fill-template org-babel-tangle-comment-format-beg link-data)
 454           (org-fill-template org-babel-tangle-comment-format-end link-data))))
 455
 456 ;; de-tangling functions
 457 (defvar org-bracket-link-analytic-regexp)
 458 (defun org-babel-detangle (&optional source-code-file)
 459   "Propagate changes in source file back original to Org-mode file.
 460 This requires that code blocks were tangled with link comments
 461 which enable the original code blocks to be found."
 462   (interactive)
 463   (save-excursion
 464     (when source-code-file (find-file source-code-file))
 465     (goto-char (point-min))
 466     (let ((counter 0) new-body end)
 467       (while (re-search-forward org-bracket-link-analytic-regexp nil t)
 468         (when (re-search-forward
 469                (concat " " (regexp-quote (match-string 5)) " ends here"))
 470           (setq end (match-end 0))
 471           (forward-line -1)
 472           (save-excursion
 473             (when (setq new-body (org-babel-tangle-jump-to-org))
 474               (org-babel-update-block-body new-body)))
 475           (setq counter (+ 1 counter)))
 476         (goto-char end))
 477       (prog1 counter (message "Detangled %d code blocks" counter)))))
 478
 479 (defun org-babel-tangle-jump-to-org ()
 480   "Jump from a tangled code file to the related Org-mode file."
 481   (interactive)
 482   (let ((mid (point))
 483         start end done
 484         target-buffer target-char link path block-name body)
 485     (save-window-excursion
 486       (save-excursion
 487         (while (and (re-search-backward org-bracket-link-analytic-regexp nil t)
 488                     (not ; ever wider searches until matching block comments
 489                      (and (setq start (point-at-eol))
 490                           (setq link (match-string 0))
 491                           (setq path (match-string 3))
 492                           (setq block-name (match-string 5))
 493                           (save-excursion
 494                             (save-match-data
 495                               (re-search-forward
 496                                (concat " " (regexp-quote block-name)
 497                                        " ends here") nil t)
 498                               (setq end (point-at-bol))))))))
 499         (unless (and start (< start mid) (< mid end))
 500           (error "Not in tangled code"))
 501         (setq body (org-babel-trim (buffer-substring start end))))
 502       (when (string-match "::" path)
 503         (setq path (substring path 0 (match-beginning 0))))
 504       (find-file path) (setq target-buffer (current-buffer))
 505       (goto-char start) (org-open-link-from-string link)
 506       (if (string-match "[^ \t\n\r]:\\([[:digit:]]+\\)" block-name)
 507           (org-babel-next-src-block
 508            (string-to-number (match-string 1 block-name)))
 509         (org-babel-goto-named-src-block block-name))
 510       (setq target-char (point)))
 511     (pop-to-buffer target-buffer)
 512     (prog1 body (goto-char target-char))))
 513
 514 (provide 'ob-tangle)
 515
 516 ;; Local variables:
 517 ;; generated-autoload-file: "org-loaddefs.el"
 518 ;; End:
 519
 520 ;;; ob-tangle.el ends here