;;; ob-exp.el --- Exportation of org-babel source blocks
;; Copyright (C) 2009, 2010 Free Software Foundation, Inc.
;; Author: Eric Schulte, Dan Davison
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; Version: 7.5
;; 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 .
;;; Commentary:
;; See the online documentation for more information
;;
;; http://orgmode.org/worg/org-contrib/babel/
;;; 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))
(add-hook 'org-export-blocks-postblock-hook 'org-exp-res/src-name-cleanup)
(org-export-blocks-add-block '(src org-babel-exp-src-blocks 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)))
(defvar org-babel-function-def-export-keyword "function"
"The keyword to substitute for the source name line on export.
When exporting a source block function, this keyword will
appear in the exported version in the place of source name
line. A source block is considered to be a source block function
if the source name is present and is followed by a parenthesized
argument list. The parentheses may be empty or contain
whitespace. An example is the following which generates n random
\(uniform) numbers.
#+source: rand(n)
#+begin_src R
runif(n)
#+end_src")
(defvar org-babel-function-def-export-indent 4
"Number of characters to indent a source block on export.
When exporting a source block function, the block contents will
be indented by this many characters. See
`org-babel-function-def-export-name' for the definition of a
source block function.")
(defmacro org-babel-exp-in-export-file (&rest body)
`(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
(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)))
(defun org-babel-exp-src-blocks (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)
(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)))
;; bail if we couldn't get any info from the block
(when info
(org-babel-exp-in-export-file
(setf (nth 2 info)
(org-babel-merge-params
org-babel-default-header-args
(org-babel-params-from-buffer)
(org-babel-params-from-properties lang)
(if (boundp lang-headers) (eval lang-headers) nil)
raw-params)))
;; expand noweb references in the original file
(setf (nth 1 info)
(if (and (cdr (assoc :noweb (nth 2 info)))
(string= "yes" (cdr (assoc :noweb (nth 2 info)))))
(org-babel-expand-noweb-references
info (get-file-buffer org-current-export-file))
(nth 1 info)))
(org-babel-exp-do-export info 'block)))))
(defun org-babel-exp-inline-src-blocks (start end)
"Process inline source blocks between START and END for export.
See `org-babel-exp-src-blocks' 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))
(replacement
(save-match-data
(if (org-babel-in-example-or-verbatim)
(buffer-substring (match-beginning 0) (match-end 0))
;; expand noweb references in the original file
(setf (nth 1 info)
(if (and (cdr (assoc :noweb params))
(string= "yes" (cdr (assoc :noweb params))))
(org-babel-expand-noweb-references
info (get-file-buffer org-current-export-file))
(nth 1 info)))
(org-babel-exp-do-export info 'inline)))))
(setq end (+ end (- (length replacement) (length (match-string 1)))))
(replace-match replacement t t nil 1)))))
(defun org-exp-res/src-name-cleanup ()
"Clean up #+results and #+srcname lines for export.
This function should only be called after all block processing
has taken place."
(interactive)
(save-excursion
(goto-char (point-min))
(while (org-re-search-forward-unprotected
(concat
"\\("org-babel-src-name-regexp"\\|"org-babel-result-regexp"\\)")
nil t)
(delete-region
(progn (beginning-of-line) (point))
(progn (end-of-line) (+ 1 (point)))))))
(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 (org-in-indented-comment-line)
(save-excursion
(save-match-data
(goto-char (point-at-bol))
(looking-at "[ \t]*:[ \t]")))
(org-in-regexps-block-p "^[ \t]*#\\+begin_src" "^[ \t]*#\\+end_src")))
(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-blocks' for export options. Currently the
options are taken from `org-babel-default-header-args'."
(interactive)
(let (replacement)
(save-excursion
(goto-char start)
(while (and (< (point) end)
(re-search-forward org-babel-lob-one-liner-regexp nil t))
(setq replacement
(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-params-from-buffer)
(org-babel-params-from-properties)
(org-babel-parse-header-arguments
(org-babel-clean-text-properties
(concat ":var results="
(mapconcat #'identity
(butlast lob-info) " ")))))
(car (last lob-info)))
'lob))))
(setq end (+ end (- (length replacement) (length (match-string 0)))))
(replace-match replacement t t)))))
(defun org-babel-exp-do-export (info type)
"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 (and session
(not (equal "none" session)))
(org-babel-exp-results info type 'silent))))
(clean () (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 type))
('results (org-babel-exp-results info type))
('both (concat (org-babel-exp-code info type)
"\n\n"
(org-babel-exp-results info type))))))
(defvar backend)
(defun org-babel-exp-code (info type)
"Prepare and return code in the current code block for export.
Code is prepared in a manner suitable for export by
org-mode. This function is called by `org-babel-exp-do-export'.
The code block is not evaluated."
(let ((lang (nth 0 info))
(body (nth 1 info))
(switches (nth 3 info))
(name (nth 4 info))
(args (mapcar #'cdr (org-babel-get-header (nth 2 info) :var))))
(case type
('inline (format "=%s=" body))
('block
(let ((str
(format "#+BEGIN_SRC %s %s\n%s%s#+END_SRC\n" lang switches body
(if (and body (string-match "\n$" body))
"" "\n"))))
(when name
(add-text-properties
0 (length str)
(list 'org-caption
(format "%s(%s)"
name
(mapconcat #'identity args ", ")))
str))
str))
('lob
(let ((call-line (and (string-match "results=" (car args))
(substring (car args) (match-end 0)))))
(cond
((eq backend 'html)
(format "\n#+HTML: \n"
call-line))
((format ": %s\n" call-line))))))))
(defun org-babel-exp-results (info type &optional silent)
"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."
(or
(when org-export-babel-evaluate
(let ((lang (nth 0 info))
(body (nth 1 info)))
(setf (nth 2 info) (org-babel-exp-in-export-file
(org-babel-process-params (nth 2 info))))
;; skip code blocks which we can't evaluate
(when (fboundp (intern (concat "org-babel-execute:" lang)))
(org-babel-eval-wipe-error-buffer)
(if (equal type 'inline)
(let ((raw (org-babel-execute-src-block
nil info '((:results . "silent"))))
(result-params (split-string
(cdr (assoc :results (nth 2 info))))))
(unless silent
(cond ;; respect the value of the :results header argument
((member "file" result-params)
(org-babel-result-to-file raw))
((or (member "raw" result-params)
(member "org" result-params))
(format "%s" raw))
((member "code" result-params)
(format "src_%s{%s}" lang raw))
(t
(if (stringp raw)
(if (= 0 (length raw)) "=(no results)="
(format "%s" raw))
(format "%S" raw))))))
(prog1 nil
(setf (nth 2 info)
(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 'lob)
(save-excursion
(re-search-backward org-babel-lob-one-liner-regexp nil t)
(org-babel-execute-src-block nil info)))))))))
""))
(provide 'ob-exp)
;; arch-tag: 523abf4c-76d1-44ed-9f27-e3bddf34bf0f
;;; ob-exp.el ends here