lisp/ob-exp.el

   1 ;;; ob-exp.el --- Exportation of org-babel source blocks
   2
   3 ;; Copyright (C) 2009, 2010  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte, Dan Davison
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8 ;; Version: 0.01
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; See the online documentation for more information
  28 ;;
  29 ;;   http://orgmode.org/worg/org-contrib/babel/
  30
  31 ;;; Code:
  32 (require 'ob)
  33 (require 'org-exp-blocks)
  34 (eval-when-compile
  35   (require 'cl))
  36
  37 (defvar obe-marker nil)
  38 (defvar org-current-export-file)
  39 (defvar org-babel-lob-one-liner-regexp)
  40 (defvar org-babel-ref-split-regexp)
  41 (declare-function org-babel-lob-get-info "ob-lob" ())
  42 (declare-function org-babel-ref-literal "ob-ref" (ref))
  43
  44 (add-to-list 'org-export-interblocks '(src org-babel-exp-inline-src-blocks))
  45 (add-to-list 'org-export-interblocks '(lob org-babel-exp-lob-one-liners))
  46 (add-hook 'org-export-blocks-postblock-hook 'org-exp-res/src-name-cleanup)
  47
  48 (org-export-blocks-add-block '(src org-babel-exp-src-blocks nil))
  49
  50 (defcustom org-export-babel-evaluate t
  51   "Switch controlling code evaluation during export.
  52 When set to nil no code will be exported as part of the export
  53 process."
  54   :group 'org-babel
  55   :type 'boolean)
  56 (put 'org-export-babel-evaluate 'safe-local-variable (lambda (x) (eq x nil)))
  57
  58 (defvar org-babel-function-def-export-keyword "function"
  59   "When exporting a source block function, this keyword will
  60 appear in the exported version in the place of source name
  61 line. A source block is considered to be a source block function
  62 if the source name is present and is followed by a parenthesized
  63 argument list. The parentheses may be empty or contain
  64 whitespace. An example is the following which generates n random
  65 \(uniform) numbers.
  66
  67 #+source: rand(n)
  68 #+begin_src R
  69   runif(n)
  70 #+end_src")
  71
  72 (defvar org-babel-function-def-export-indent 4
  73   "When exporting a source block function, the block contents
  74 will be indented by this many characters. See
  75 `org-babel-function-def-export-name' for the definition of a
  76 source block function.")
  77
  78 (defun org-babel-exp-src-blocks (body &rest headers)
  79   "Process src block for export.  Depending on the 'export'
  80 headers argument in replace the source code block with...
  81
  82 both ---- display the code and the results
  83
  84 code ---- the default, display the code inside the block but do
  85           not process
  86
  87 results - just like none only the block is run on export ensuring
  88           that it's results are present in the org-mode buffer
  89
  90 none ----- do not display either code or results upon export"
  91   (interactive)
  92   (message "org-babel-exp processing...")
  93   (save-excursion
  94     (goto-char (match-beginning 0))
  95     (let* ((info (org-babel-get-src-block-info))
  96            (params (nth 2 info)))
  97       ;; expand noweb references in the original file
  98       (setf (nth 1 info)
  99             (if (and (cdr (assoc :noweb params))
 100                      (string= "yes" (cdr (assoc :noweb params))))
 101                 (org-babel-expand-noweb-references
 102                  info (get-file-buffer org-current-export-file))
 103               (nth 1 info)))
 104       (org-babel-exp-do-export info 'block))))
 105
 106 (defun org-babel-exp-inline-src-blocks (start end)
 107   "Process inline src blocks between START and END for export.
 108 See `org-babel-exp-src-blocks' for export options, currently the
 109 options and are taken from `org-babel-default-inline-header-args'."
 110   (interactive)
 111   (save-excursion
 112     (goto-char start)
 113     (while (and (< (point) end)
 114                 (re-search-forward org-babel-inline-src-block-regexp end t))
 115       (let* ((info (save-match-data (org-babel-parse-inline-src-block-match)))
 116              (params (nth 2 info))
 117              (replacement
 118               (save-match-data
 119                 (if (org-babel-in-example-or-verbatim)
 120                     (buffer-substring (match-beginning 0) (match-end 0))
 121                   ;; expand noweb references in the original file
 122                   (setf (nth 1 info)
 123                         (if (and (cdr (assoc :noweb params))
 124                                  (string= "yes" (cdr (assoc :noweb params))))
 125                             (org-babel-expand-noweb-references
 126                              info (get-file-buffer org-current-export-file))
 127                           (nth 1 info)))
 128                   (org-babel-exp-do-export info 'inline)))))
 129         (setq end (+ end (- (length replacement) (length (match-string 1)))))
 130         (replace-match replacement t t nil 1)))))
 131
 132 (defun org-exp-res/src-name-cleanup ()
 133   "Cleanup leftover #+results and #+srcname lines as part of the
 134 org export cycle.  This should only be called after all block
 135 processing has taken place."
 136   (interactive)
 137   (save-excursion
 138     (goto-char (point-min))
 139     (while (org-re-search-forward-unprotected
 140             (concat
 141              "\\("org-babel-source-name-regexp"\\|"org-babel-result-regexp"\\)")
 142             nil t)
 143       (delete-region
 144        (progn (beginning-of-line) (point))
 145        (progn (end-of-line) (+ 1 (point)))))))
 146
 147 (defun org-babel-in-example-or-verbatim ()
 148   "Return true if the point is currently in an escaped portion of
 149 an org-mode buffer code which should be treated as normal
 150 org-mode text."
 151   (or (org-in-indented-comment-line)
 152       (save-excursion
 153         (save-match-data
 154           (goto-char (point-at-bol))
 155           (looking-at "[ \t]*:[ \t]")))
 156       (org-in-regexps-block-p "^[ \t]*#\\+begin_src" "^[ \t]*#\\+end_src")))
 157
 158 (defun org-babel-exp-lob-one-liners (start end)
 159   "Process #+lob (Library of Babel) calls between START and END for export.
 160 See `org-babel-exp-src-blocks' for export options. Currently the
 161 options are taken from `org-babel-default-header-args'."
 162   (interactive)
 163   (let (replacement)
 164     (save-excursion
 165       (goto-char start)
 166       (while (and (< (point) end)
 167                   (re-search-forward org-babel-lob-one-liner-regexp nil t))
 168         (setq replacement
 169               (let ((lob-info (org-babel-lob-get-info)))
 170                 (save-match-data
 171                   (org-babel-exp-do-export
 172                    (list "emacs-lisp" "results"
 173                          (org-babel-merge-params
 174                           org-babel-default-header-args
 175                           (org-babel-parse-header-arguments
 176                            (org-babel-clean-text-properties
 177                             (concat ":var results="
 178                                     (mapconcat #'identity
 179                                                (butlast lob-info) " ")))))
 180                          (car (last lob-info)))
 181                    'lob))))
 182         (setq end (+ end (- (length replacement) (length (match-string 0)))))
 183         (replace-match replacement t t)))))
 184
 185 (defun org-babel-exp-do-export (info type)
 186   "Return a string containing the exported content of the current
 187 code block respecting the value of the :exports header argument."
 188   (flet ((silently () (let ((session (cdr (assoc :session (nth 2 info)))))
 189                         (when (and session
 190                                    (not (equal "none" session))
 191                                    (not (assoc :noeval (nth 2 info))))
 192                           (org-babel-exp-results info type 'silent))))
 193          (clean () (org-babel-remove-result info)))
 194     (case (intern (or (cdr (assoc :exports (nth 2 info))) "code"))
 195       ('none (silently) (clean) "")
 196       ('code (silently) (clean) (org-babel-exp-code info type))
 197       ('results (org-babel-exp-results info type))
 198       ('both (concat (org-babel-exp-code info type)
 199                      "\n\n"
 200                      (org-babel-exp-results info type))))))
 201
 202 (defvar backend)
 203 (defun org-babel-exp-code (info type)
 204   "Return the code the current code block in a manner suitable
 205 for exportation by org-mode.  This function is called by
 206 `org-babel-exp-do-export'.  The code block will not be
 207 evaluated."
 208   (let ((lang (nth 0 info))
 209         (body (nth 1 info))
 210         (switches (nth 3 info))
 211         (name (nth 4 info))
 212         (args (mapcar
 213                #'cdr
 214                (org-remove-if-not (lambda (el) (eq :var (car el))) (nth 2 info)))))
 215     (case type
 216       ('inline (format "=%s=" body))
 217       ('block
 218           (let ((str
 219                  (format "#+BEGIN_SRC %s %s\n%s%s#+END_SRC\n" lang switches body
 220                          (if (and body (string-match "\n$" body))
 221                              "" "\n"))))
 222             (when name
 223               (add-text-properties
 224                0 (length str)
 225                (list 'org-caption
 226                      (format "%s(%s)"
 227                              name
 228                              (mapconcat #'identity args ", ")))
 229                str))
 230             str))
 231       ('lob
 232        (let ((call-line (and (string-match "results=" (car args))
 233                              (substring (car args) (match-end 0)))))
 234          (cond
 235           ((eq backend 'html)
 236            (format "\n#+HTML: <label class=\"org-src-name\">%s</label>\n"
 237                    call-line))
 238           ((format ": %s\n" call-line))))))))
 239
 240 (defun org-babel-exp-results (info type &optional silent)
 241   "Return the results of the current code block in a manner
 242 suitable for exportation by org-mode.  This function is called by
 243 `org-babel-exp-do-export'.  The code block will be evaluated.
 244 Optional argument SILENT can be used to inhibit insertion of
 245 results into the buffer."
 246   (if org-export-babel-evaluate
 247       (let ((lang (nth 0 info))
 248             (body (nth 1 info))
 249             (params
 250              ;; lets ensure that we lookup references in the original file
 251              (mapcar
 252               (lambda (pair)
 253                 (if (and org-current-export-file
 254                          (eq (car pair) :var)
 255                          (string-match org-babel-ref-split-regexp (cdr pair))
 256                          (equal :ob-must-be-reference
 257                                 (org-babel-ref-literal
 258                                  (match-string 2 (cdr pair)))))
 259                     `(:var . ,(concat (match-string 1 (cdr pair))
 260                                       "=" org-current-export-file
 261                                       ":" (match-string 2 (cdr pair))))
 262                   pair))
 263               (nth 2 info))))
 264         ;; skip code blocks which we can't evaluate
 265         (if (fboundp (intern (concat "org-babel-execute:" lang)))
 266             (case type
 267               ('inline
 268                 (let ((raw (org-babel-execute-src-block
 269                             nil info '((:results . "silent"))))
 270                       (result-params (split-string
 271                                       (cdr (assoc :results params)))))
 272                   (unless silent
 273                     (cond ;; respect the value of the :results header argument
 274                      ((member "file" result-params)
 275                       (org-babel-result-to-file raw))
 276                      ((or (member "raw" result-params)
 277                           (member "org" result-params))
 278                       (format "%s" raw))
 279                      ((member "code" result-params)
 280                       (format "src_%s{%s}" lang raw))
 281                      (t
 282                       (if (stringp raw)
 283                           (if (= 0 (length raw)) "=(no results)="
 284                             (format "%s" raw))
 285                         (format "%S" raw)))))))
 286               ('block
 287                   (org-babel-execute-src-block
 288                    nil info (org-babel-merge-params
 289                              params
 290                              `((:results . ,(if silent "silent" "replace")))))
 291                 "")
 292               ('lob
 293                (save-excursion
 294                  (re-search-backward org-babel-lob-one-liner-regexp nil t)
 295                  (org-babel-execute-src-block
 296                   nil info (org-babel-merge-params
 297                             params
 298                             `((:results . ,(if silent "silent" "replace")))))
 299                  "")))
 300           ""))
 301     ""))
 302
 303 (provide 'ob-exp)
 304
 305 ;; arch-tag: 523abf4c-76d1-44ed-9f27-e3bddf34bf0f
 306
 307 ;;; ob-exp.el ends here