org-mode-mirror/lisp/ob-exp.el

;;; ob-exp.el --- Exportation of org-babel source blocks

;; Copyright (C) 2009-2012  Free Software Foundation, Inc.

;; Author: Eric Schulte
;;	Dan Davison
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Code:
(require 'ob)
(require 'org-exp-blocks)
(eval-when-compile
  (require 'cl))

(defvar obe-marker nil)
(defvar org-current-export-file)
(defvar org-babel-lob-one-liner-regexp)
(defvar org-babel-ref-split-regexp)
(declare-function org-babel-lob-get-info "ob-lob" ())
(declare-function org-babel-eval-wipe-error-buffer "ob-eval" ())
(add-to-list 'org-export-interblocks '(src org-babel-exp-inline-src-blocks))
(add-to-list 'org-export-interblocks '(lob org-babel-exp-lob-one-liners))

(org-export-blocks-add-block '(src org-babel-exp-src-block nil))

(defcustom org-export-babel-evaluate t
  "Switch controlling code evaluation during export.
When set to nil no code will be evaluated as part of the export
process."
  :group 'org-babel
  :type 'boolean)
(put 'org-export-babel-evaluate 'safe-local-variable (lambda (x) (eq x nil)))

(defmacro org-babel-exp-in-export-file (lang &rest body)
  (declare (indent 1))
  `(let* ((lang-headers (intern (concat "org-babel-default-header-args:" ,lang)))
	  (heading (nth 4 (ignore-errors (org-heading-components))))
	  (link (when org-current-export-file
		  (org-make-link-string
		   (if heading
		       (concat org-current-export-file "::" heading)
		     org-current-export-file))))
	  (export-buffer (current-buffer)) results)
     (when link
       ;; resolve parameters in the original file so that
       ;; headline and file-wide parameters are included, attempt
       ;; to go to the same heading in the original file
       (set-buffer (get-file-buffer org-current-export-file))
       (save-restriction
	 (condition-case nil
	     (let ((org-link-search-inhibit-query t))
	       (org-open-link-from-string link))
	   (error (when heading
		    (goto-char (point-min))
		    (re-search-forward (regexp-quote heading) nil t))))
	 (setq results ,@body))
       (set-buffer export-buffer)
       results)))
(def-edebug-spec org-babel-exp-in-export-file (form body))

(defun org-babel-exp-src-block (body &rest headers)
  "Process source block for export.
Depending on the 'export' headers argument in replace the source
code block with...

both ---- display the code and the results

code ---- the default, display the code inside the block but do
          not process

results - just like none only the block is run on export ensuring
          that it's results are present in the org-mode buffer

none ----- do not display either code or results upon export"
  (interactive)
  (unless noninteractive (message "org-babel-exp processing..."))
  (save-excursion
    (goto-char (match-beginning 0))
    (let* ((info (org-babel-get-src-block-info 'light))
	   (lang (nth 0 info))
	   (raw-params (nth 2 info)) hash)
      ;; bail if we couldn't get any info from the block
      (when info
	;; if we're actually going to need the parameters
	(when (member (cdr (assoc :exports (nth 2 info))) '("both" "results"))
	  (org-babel-exp-in-export-file lang
	    (setf (nth 2 info)
		  (org-babel-process-params
		   (org-babel-merge-params
		    org-babel-default-header-args
		    (org-babel-params-from-properties lang)
		    (if (boundp lang-headers) (eval lang-headers) nil)
		    raw-params))))
	  (setf hash (org-babel-sha1-hash info)))
	;; expand noweb references in the original file
	(setf (nth 1 info)
	      (if (org-babel-noweb-p (nth 2 info) :export)
		  (org-babel-expand-noweb-references
		   info (get-file-buffer org-current-export-file))
		(nth 1 info)))
	(org-babel-exp-do-export info 'block hash)))))

(defun org-babel-exp-inline-src-blocks (start end)
  "Process inline source blocks between START and END for export.
See `org-babel-exp-src-block' for export options, currently the
options and are taken from `org-babel-default-inline-header-args'."
  (interactive)
  (save-excursion
    (goto-char start)
    (while (and (< (point) end)
                (re-search-forward org-babel-inline-src-block-regexp end t))
      (let* ((info (save-match-data (org-babel-parse-inline-src-block-match)))
	     (params (nth 2 info)))
	(save-match-data
	  (goto-char (match-beginning 2))
	  (unless (org-babel-in-example-or-verbatim)
	    ;; expand noweb references in the original file
	    (setf (nth 1 info)
		  (if (org-babel-noweb-p params :export)
		      (org-babel-expand-noweb-references
		       info (get-file-buffer org-current-export-file))
		    (nth 1 info)))
	    (let ((code-replacement (save-match-data
				      (org-babel-exp-do-export info 'inline))))
	      (if code-replacement
		  (replace-match code-replacement nil nil nil 1)
		(org-babel-examplize-region (match-beginning 1) (match-end 1))
		(forward-char 2)))))))))

(defun org-babel-in-example-or-verbatim ()
  "Return true if point is in example or verbatim code.
Example and verbatim code include escaped portions of
an org-mode buffer code that should be treated as normal
org-mode text."
  (or (save-match-data
	(save-excursion
	  (goto-char (point-at-bol))
	  (looking-at "[ \t]*:[ \t]")))
      (org-in-verbatim-emphasis)
      (org-in-block-p org-list-forbidden-blocks)
      (org-between-regexps-p "^[ \t]*#\\+begin_src" "^[ \t]*#\\+end_src")))

(defvar org-babel-default-lob-header-args)
(defun org-babel-exp-lob-one-liners (start end)
  "Process Library of Babel calls between START and END for export.
See `org-babel-exp-src-block' for export options. Currently the
options are taken from `org-babel-default-header-args'."
  (interactive)
  (save-excursion
    (goto-char start)
    (unless (markerp end)
      (let ((m (make-marker)))
	(set-marker m end (current-buffer))
	(setq end m)))
    (while (and (< (point) (marker-position end))
		(re-search-forward org-babel-lob-one-liner-regexp end t))
      (unless (org-babel-in-example-or-verbatim)
	(let* ((lob-info (org-babel-lob-get-info))
	       (inlinep (match-string 11))
	       (inline-start (match-end 11))
	       (inline-end (match-end 0))
	       (rep (let ((lob-info (org-babel-lob-get-info)))
		      (save-match-data
			(org-babel-exp-do-export
			 (list "emacs-lisp" "results"
			       (org-babel-merge-params
				org-babel-default-header-args
				org-babel-default-lob-header-args
				(org-babel-params-from-properties)
				(org-babel-parse-header-arguments
				 (org-babel-clean-text-properties
				  (concat ":var results="
					  (mapconcat #'identity
						     (butlast lob-info) " ")))))
			       "" nil (car (last lob-info)))
			 'lob)))))
	  (if inlinep
	      (save-excursion
		(goto-char inline-start)
		(delete-region inline-start inline-end)
		(insert rep))
	    (replace-match rep t t)))))))

(defun org-babel-exp-do-export (info type &optional hash)
  "Return a string with the exported content of a code block.
The function respects the value of the :exports header argument."
  (flet ((silently () (let ((session (cdr (assoc :session (nth 2 info)))))
			(when (not (and session (equal "none" session)))
			  (org-babel-exp-results info type 'silent))))
	 (clean () (unless (eq type 'inline) (org-babel-remove-result info))))
    (case (intern (or (cdr (assoc :exports (nth 2 info))) "code"))
      ('none (silently) (clean) "")
      ('code (silently) (clean) (org-babel-exp-code info))
      ('results (org-babel-exp-results info type nil hash) "")
      ('both (org-babel-exp-results info type nil hash)
	     (org-babel-exp-code info)))))

(defcustom org-babel-exp-code-template
  "#+BEGIN_SRC %lang%flags\n%body\n#+END_SRC"
  "Template used to export the body of code blocks.
This template may be customized to include additional information
such as the code block name, or the values of particular header
arguments.  The template is filled out using `org-fill-template',
and the following %keys may be used.

 lang ------ the language of the code block
 name ------ the name of the code block
 body ------ the body of the code block
 flags ----- the flags passed to the code block

In addition to the keys mentioned above, every header argument
defined for the code block may be used as a key and will be
replaced with its value."
  :group 'org-babel
  :type 'string)

(defun org-babel-exp-code (info)
  "Return the original code block formatted for export."
  (org-fill-template
   org-babel-exp-code-template
   `(("lang"  . ,(nth 0 info))
     ("body"  . ,(nth 1 info))
     ,@(mapcar (lambda (pair)
		 (cons (substring (symbol-name (car pair)) 1)
		       (format "%S" (cdr pair))))
	       (nth 2 info))
     ("flags" . ,((lambda (f) (when f (concat " " f))) (nth 3 info)))
     ("name"  . ,(or (nth 4 info) "")))))

(defun org-babel-exp-results (info type &optional silent hash)
  "Evaluate and return the results of the current code block for export.
Results are prepared in a manner suitable for export by org-mode.
This function is called by `org-babel-exp-do-export'.  The code
block will be evaluated.  Optional argument SILENT can be used to
inhibit insertion of results into the buffer."
  (when (and org-export-babel-evaluate
	     (not (and hash (equal hash (org-babel-current-result-hash)))))
    (let ((lang (nth 0 info))
	  (body (nth 1 info))
	  (info (copy-sequence info)))
      ;; skip code blocks which we can't evaluate
      (when (fboundp (intern (concat "org-babel-execute:" lang)))
	(org-babel-eval-wipe-error-buffer)
	(prog1 nil
	  (setf (nth 2 info)
		(org-babel-exp-in-export-file lang
		  (org-babel-process-params
		   (org-babel-merge-params
		    (nth 2 info)
		    `((:results . ,(if silent "silent" "replace")))))))
	  (cond
	   ((equal type 'block)
	    (org-babel-execute-src-block nil info))
	   ((equal type 'inline)
	    ;; position the point on the inline source block allowing
	    ;; `org-babel-insert-result' to check that the block is
	    ;; inline
	    (re-search-backward "[ \f\t\n\r\v]" nil t)
	    (re-search-forward org-babel-inline-src-block-regexp nil t)
	    (re-search-backward "src_" nil t)
	    (org-babel-execute-src-block nil info))
	   ((equal type 'lob)
	    (save-excursion
	      (re-search-backward org-babel-lob-one-liner-regexp nil t)
	      (org-babel-execute-src-block nil info)))))))))

(provide 'ob-exp)



;;; ob-exp.el ends here