;;; 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: 0.01
;; 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-ref-literal "ob-ref" (ref))
(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 exported as part of the export
process."
:group 'org-babel
:type 'boolean)
(defvar org-babel-function-def-export-keyword "function"
"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
"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.")
(defun org-babel-exp-src-blocks (body &rest headers)
"Process src 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))
(params (nth 2 info)))
;; 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 'block))))
(defun org-babel-exp-inline-src-blocks (start end)
"Process inline src 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 ()
"Cleanup leftover #+results and #+srcname lines as part of the
org export cycle. This 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-source-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 the point is currently in an escaped portion of
an org-mode buffer code which 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 #+lob (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-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 containing the exported content of the current
code block respecting the value of the :exports header argument."
(flet ((silently () (let ((session (cdr (assoc :session (nth 2 info)))))
(when (and session
(not (equal "none" session))
(not (assoc :noeval (nth 2 info))))
(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)
"Return the code the current code block in a manner suitable
for exportation by org-mode. This function is called by
`org-babel-exp-do-export'. The code block will not be
evaluated."
(let ((lang (nth 0 info))
(body (nth 1 info))
(switches (nth 3 info))
(name (nth 4 info))
(args (mapcar
#'cdr
(org-remove-if-not (lambda (el) (eq :var (car el))) (nth 2 info)))))
(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)
"Return the results of the current code block in a manner
suitable for exportation 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."
(if org-export-babel-evaluate
(let ((lang (nth 0 info))
(body (nth 1 info))
(params
;; lets ensure that we lookup references in the original file
(mapcar
(lambda (pair)
(if (and org-current-export-file
(eq (car pair) :var)
(string-match org-babel-ref-split-regexp (cdr pair))
(equal :ob-must-be-reference
(org-babel-ref-literal
(match-string 2 (cdr pair)))))
`(:var . ,(concat (match-string 1 (cdr pair))
"=" org-current-export-file
":" (match-string 2 (cdr pair))))
pair))
(nth 2 info))))
;; skip code blocks which we can't evaluate
(if (fboundp (intern (concat "org-babel-execute:" lang)))
(case type
('inline
(let ((raw (org-babel-execute-src-block
nil info '((:results . "silent"))))
(result-params (split-string
(cdr (assoc :results params)))))
(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)))))))
('block
(org-babel-execute-src-block
nil info (org-babel-merge-params
params
`((:results . ,(if silent "silent" "replace")))))
"")
('lob
(save-excursion
(re-search-backward org-babel-lob-one-liner-regexp nil t)
(org-babel-execute-src-block
nil info (org-babel-merge-params
params
`((:results . ,(if silent "silent" "replace")))))
"")))
""))
""))
(provide 'ob-exp)
;; arch-tag: 523abf4c-76d1-44ed-9f27-e3bddf34bf0f
;;; ob-exp.el ends here