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;;; ob-latex.el --- org-babel functions for latex "evaluation"
;; Copyright (C) 2009-2012 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; 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/>.
;;; Commentary:
;; Org-Babel support for evaluating LaTeX source code.
;;
;; Currently on evaluation this returns raw LaTeX code, unless a :file
;; header argument is given in which case small png or pdf files will
;; be created directly form the latex source code.
;;; Code:
(require 'ob)
(declare-function org-create-formula-image "org" (string tofile options buffer))
(declare-function org-splice-latex-header "org"
(tpl def-pkg pkg snippets-p &optional extra))
(declare-function org-export-latex-fix-inputenc "org-latex" ())
(defvar org-babel-tangle-lang-exts)
(add-to-list 'org-babel-tangle-lang-exts '("latex" . "tex"))
(defvar org-format-latex-header)
(defvar org-format-latex-header-extra)
(defvar org-export-latex-packages-alist)
(defvar org-export-latex-default-packages-alist)
(defvar org-export-pdf-logfiles)
(defvar org-latex-to-pdf-process)
(defvar org-export-pdf-remove-logfiles)
(defvar org-format-latex-options)
(defvar org-export-latex-packages-alist)
(defvar org-babel-default-header-args:latex
'((:results . "latex") (:exports . "results"))
"Default arguments to use when evaluating a LaTeX source block.")
(defun org-babel-expand-body:latex (body params)
"Expand BODY according to PARAMS, return the expanded body."
(mapc (lambda (pair) ;; replace variables
(setq body
(replace-regexp-in-string
(regexp-quote (format "%S" (car pair)))
(if (stringp (cdr pair))
(cdr pair) (format "%S" (cdr pair)))
body))) (mapcar #'cdr (org-babel-get-header params :var)))
(org-babel-trim body))
(defun org-babel-execute:latex (body params)
"Execute a block of Latex code with Babel.
This function is called by `org-babel-execute-src-block'."
(setq body (org-babel-expand-body:latex body params))
(if (cdr (assoc :file params))
(let* ((out-file (cdr (assoc :file params)))
(tex-file (org-babel-temp-file "latex-" ".tex"))
(border (cdr (assoc :border params)))
(imagemagick (cdr (assoc :imagemagick params)))
(im-in-options (cdr (assoc :iminoptions params)))
(im-out-options (cdr (assoc :imoutoptions params)))
(pdfpng (cdr (assoc :pdfpng params)))
(fit (or (cdr (assoc :fit params)) border))
(height (and fit (cdr (assoc :pdfheight params))))
(width (and fit (cdr (assoc :pdfwidth params))))
(headers (cdr (assoc :headers params)))
(in-buffer (not (string= "no" (cdr (assoc :buffer params)))))
(org-export-latex-packages-alist
(append (cdr (assoc :packages params))
org-export-latex-packages-alist)))
(cond
((and (string-match "\\.png$" out-file) (not imagemagick))
(org-create-formula-image
body out-file org-format-latex-options in-buffer))
((or (string-match "\\.pdf$" out-file) imagemagick)
(require 'org-latex)
(with-temp-file tex-file
(insert
(org-splice-latex-header
org-format-latex-header
(delq
nil
(mapcar
(lambda (el)
(unless (and (listp el) (string= "hyperref" (cadr el)))
el))
org-export-latex-default-packages-alist))
org-export-latex-packages-alist
org-format-latex-header-extra)
(if fit "\n\\usepackage[active, tightpage]{preview}\n" "")
(if border (format "\\setlength{\\PreviewBorder}{%s}" border) "")
(if height (concat "\n" (format "\\pdfpageheight %s" height)) "")
(if width (concat "\n" (format "\\pdfpagewidth %s" width)) "")
(if headers
(concat "\n"
(if (listp headers)
(mapconcat #'identity headers "\n")
headers) "\n")
"")
(if org-format-latex-header-extra
(concat "\n" org-format-latex-header-extra)
"")
(if fit
(concat "\n\\begin{document}\n\\begin{preview}\n" body
"\n\\end{preview}\n\\end{document}\n")
(concat "\n\\begin{document}\n" body "\n\\end{document}\n")))
(org-export-latex-fix-inputenc))
(when (file-exists-p out-file) (delete-file out-file))
(let ((transient-pdf-file (org-babel-latex-tex-to-pdf tex-file)))
(cond
((string-match "\\.pdf$" out-file)
(rename-file transient-pdf-file out-file))
(imagemagick
(convert-pdf
transient-pdf-file out-file im-in-options im-out-options)
(when (file-exists-p transient-pdf-file)
(delete-file transient-pdf-file))))))
((string-match "\\.\\([^\\.]+\\)$" out-file)
(error "Can not create %s files, please specify a .png or .pdf file or try the :imagemagick header argument"
(match-string 1 out-file))))
nil) ;; signal that output has already been written to file
body))
(defun convert-pdf (pdffile out-file im-in-options im-out-options)
"Generate a file from a pdf file using imagemagick."
(let ((cmd (concat "convert " im-in-options " " pdffile " "
im-out-options " " out-file)))
(message (concat "Converting pdffile file " cmd "..."))
(shell-command cmd)))
(defun org-babel-latex-tex-to-pdf (file)
"Generate a pdf file according to the contents FILE.
Extracted from `org-export-as-pdf' in org-latex.el."
(let* ((wconfig (current-window-configuration))
(default-directory (file-name-directory file))
(base (file-name-sans-extension file))
(pdffile (concat base ".pdf"))
(cmds org-latex-to-pdf-process)
(outbuf (get-buffer-create "*Org PDF LaTeX Output*"))
output-dir cmd)
(with-current-buffer outbuf (erase-buffer))
(message (concat "Processing LaTeX file " file "..."))
(setq output-dir (file-name-directory file))
(if (and cmds (symbolp cmds))
(funcall cmds (shell-quote-argument file))
(while cmds
(setq cmd (pop cmds))
(while (string-match "%b" cmd)
(setq cmd (replace-match
(save-match-data
(shell-quote-argument base))
t t cmd)))
(while (string-match "%f" cmd)
(setq cmd (replace-match
(save-match-data
(shell-quote-argument file))
t t cmd)))
(while (string-match "%o" cmd)
(setq cmd (replace-match
(save-match-data
(shell-quote-argument output-dir))
t t cmd)))
(shell-command cmd outbuf)))
(message (concat "Processing LaTeX file " file "...done"))
(if (not (file-exists-p pdffile))
(error (concat "PDF file " pdffile " was not produced"))
(set-window-configuration wconfig)
(when org-export-pdf-remove-logfiles
(dolist (ext org-export-pdf-logfiles)
(setq file (concat base "." ext))
(and (file-exists-p file) (delete-file file))))
(message "Exporting to PDF...done")
pdffile)))
(defun org-babel-prep-session:latex (session params)
"Return an error because LaTeX doesn't support sessions."
(error "LaTeX does not support sessions"))
(provide 'ob-latex)
;;; ob-latex.el ends here
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