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|
;;; ox-bibtex.el --- Export bibtex fragments
;; Copyright (C) 2009-2013 Taru Karttunen
;; Author: Taru Karttunen <taruti@taruti.net>
;; Nicolas Goaziou <n dot goaziou at gmail dot com>
;; This file is not currently part of GNU Emacs.
;; This program 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 2, or (at
;; your option) any later version.
;; This program 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 this program ; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;
;; This is an utility to handle BibTeX export to both LaTeX and html
;; exports. It uses the bibtex2html software from:
;;
;; http://www.lri.fr/~filliatr/bibtex2html/
;;
;; It also introduces "cite" syntax for Org links.
;;
;; The usage is as follows:
;;
;; #+BIBLIOGRAPHY: bibfilebasename stylename optional-options
;;
;; e.g. given foo.bib and using style plain:
;;
;; #+BIBLIOGRAPHY: foo plain option:-d
;;
;; Optional options are of the form:
;;
;; option:-foobar pass '-foobar' to bibtex2html
;;
;; e.g.,
;;
;; option:-d sort by date
;; option:-a sort as BibTeX (usually by author) *default*
;; option:-u unsorted i.e. same order as in .bib file
;; option:-r reverse the sort
;;
;; See the bibtex2html man page for more. Multiple options can be
;; combined like:
;;
;; option:-d option:-r
;;
;; Limiting to only the entries cited in the document:
;;
;; limit:t
;;
;; For LaTeX export this simply inserts the lines
;;
;; \bibliographystyle{plain}
;; \bibliography{foo}
;;
;; into the TeX file when exporting.
;;
;; For HTML export it:
;; 1) converts all \cite{foo} and [[cite:foo]] to links to the
;; bibliography,
;; 2) creates a foo.html and foo_bib.html,
;; 3) includes the contents of foo.html in the exported HTML file.
;;
;; For LaTeX export it:
;; 1) converts all [[cite:foo]] to \cite{foo}.
;; Initialization
(eval-when-compile (require 'cl))
(org-add-link-type "cite" 'ebib)
;;; Internal Functions
(defun org-bibtex-get-file (keyword)
"Return bibliography file as a string.
KEYWORD is a \"BIBLIOGRAPHY\" keyword. If no file is found,
return nil instead."
(let ((value (org-element-property :value keyword)))
(and value
(string-match "\\(\\S-+\\)[ \t]+\\(\\S-+\\)\\(.*\\)" value)
(match-string 1 value))))
(defun org-bibtex-get-style (keyword)
"Return bibliography style as a string.
KEYWORD is a \"BIBLIOGRAPHY\" keyword. If no style is found,
return nil instead."
(let ((value (org-element-property :value keyword)))
(and value
(string-match "\\(\\S-+\\)[ \t]+\\(\\S-+\\)\\(.*\\)" value)
(match-string 2 value))))
(defun org-bibtex-get-arguments (keyword)
"Return \"bibtex2html\" arguments specified by the user.
KEYWORD is a \"BIBLIOGRAPHY\" keyword. Return value is a plist
containing `:options' and `:limit' properties. The former
contains a list of strings to be passed as options ot
\"bibtex2html\" process. The latter contains a boolean."
(let ((value (org-element-property :value keyword)))
(and value
(string-match "\\(\\S-+\\)[ \t]+\\(\\S-+\\)\\(.*\\)" value)
(let (options limit)
(dolist (arg (org-split-string (match-string 3 value))
;; Return value.
(list :options (nreverse options) :limit limit))
(let* ((s (split-string arg ":"))
(key (car s))
(value (nth 1 s)))
(cond ((equal "limit" key)
(setq limit (not (equal "nil" value))))
((equal "option" key) (push value options)))))))))
(defun org-bibtex-citation-p (object)
"Non-nil when OBJECT is a citation."
(case (org-element-type object)
(link (equal (org-element-property :type object) "cite"))
(latex-fragment
(string-match "\\`\\\\cite{" (org-element-property :value object)))))
(defun org-bibtex-get-citation-key (citation)
"Return key for a given citation, as a string.
CITATION is a `latex-fragment' or `link' type object satisfying
to `org-bibtex-citation-p' predicate."
(if (eq (org-element-type citation) 'link)
(org-element-property :path citation)
(let ((value (org-element-property :value citation)))
(and (string-match "\\`\\\\cite{" value)
(substring value (match-end 0) -1)))))
;;; LaTeX Part
(defadvice org-latex-keyword (around bibtex-keyword)
"Translate \"BIBLIOGRAPHY\" keywords into LaTeX syntax.
Fallback to `latex' back-end for other keywords."
(let ((keyword (ad-get-arg 0)))
(if (not (equal (org-element-property :key keyword) "BIBLIOGRAPHY"))
ad-do-it
(let ((file (org-bibtex-get-file keyword))
(style (org-bibtex-get-style keyword)))
(setq ad-return-value
(when file
(concat (and style (format "\\bibliographystyle{%s}\n" style))
(format "\\bibliography{%s}" file))))))))
(defadvice org-latex-link (around bibtex-link)
"Translate \"cite\" type links into LaTeX syntax.
Fallback to `latex' back-end for other keywords."
(let ((link (ad-get-arg 0)))
(if (not (org-bibtex-citation-p link)) ad-do-it
(setq ad-return-value
(format "\\cite{%s}" (org-bibtex-get-citation-key link))))))
(ad-activate 'org-latex-keyword)
(ad-activate 'org-latex-link)
;;; HTML Part
(defvar org-bibtex-html-entries-alist nil) ; Dynamically scoped.
(defvar org-bibtex-html-keywords-alist nil) ; Dynamically scoped.
;;;; Advices
(defadvice org-html-keyword (around bibtex-keyword)
"Translate \"BIBLIOGRAPHY\" keywords into HTML syntax.
Fallback to `html' back-end for other keywords."
(let ((keyword (ad-get-arg 0)))
(if (not (equal (org-element-property :key keyword) "BIBLIOGRAPHY"))
ad-do-it
(setq ad-return-value
(cdr (assq keyword org-bibtex-html-keywords-alist))))))
(defadvice org-html-latex-fragment (around bibtex-citation)
"Translate \"\\cite\" LaTeX fragments into HTML syntax.
Fallback to `html' back-end for other keywords."
(let ((fragment (ad-get-arg 0)))
(if (not (org-bibtex-citation-p fragment)) ad-do-it
(setq ad-return-value
(mapconcat
(lambda (key)
(let ((key (org-trim key)))
(format "[<a href=\"#%s\">%s</a>]"
key
(or (cdr (assoc key org-bibtex-html-entries-alist))
key))))
(org-split-string (org-bibtex-get-citation-key fragment) ",")
"")))))
(defadvice org-html-link (around bibtex-link)
"Translate \"cite:\" type links into HTML syntax.
Fallback to `html' back-end for other types."
(let ((link (ad-get-arg 0)))
(if (not (org-bibtex-citation-p link)) ad-do-it
(setq ad-return-value
(mapconcat
(lambda (key)
(format "[<a href=\"#%s\">%s</a>]"
key
(or (cdr (assoc key org-bibtex-html-entries-alist))
key)))
(org-split-string (org-bibtex-get-citation-key link)
"[ \t]*,[ \t]*")
"")))))
(ad-activate 'org-html-keyword)
(ad-activate 'org-html-latex-fragment)
(ad-activate 'org-html-link)
;;;; Filter
(defun org-bibtex-process-bib-files (tree backend info)
"Send each bibliography in parse tree to \"bibtex2html\" process.
Return new parse tree. This function assumes current back-end is HTML."
;; Initialize dynamically scoped variables. The first one
;; contain an alist between keyword objects and their HTML
;; translation. The second one will contain an alist between
;; citation keys and names in the output (according to style).
(setq org-bibtex-html-entries-alist nil
org-bibtex-html-keywords-alist nil)
(org-element-map tree 'keyword
(lambda (keyword)
(when (equal (org-element-property :key keyword) "BIBLIOGRAPHY")
(let ((arguments (org-bibtex-get-arguments keyword))
(file (org-bibtex-get-file keyword))
temp-file)
;; limit is set: collect citations throughout the document
;; in TEMP-FILE and pass it to "bibtex2html" as "-citefile"
;; argument.
(when (plist-get arguments :limit)
(let ((citations
(org-element-map tree '(latex-fragment link)
(lambda (object)
(and (org-bibtex-citation-p object)
(org-bibtex-get-citation-key object))))))
(with-temp-file (setq temp-file (make-temp-file "ox-bibtex"))
(insert (mapconcat 'identity citations "\n")))
(setq arguments
(plist-put arguments
:options
(append (plist-get arguments :options)
(list "-citefile" temp-file))))))
;; Call "bibtex2html" on specified file.
(unless (eq 0 (apply 'call-process
(append '("bibtex2html" nil nil nil)
'("-a" "-nodoc" "-noheader" "-nofooter")
(list "--style"
(org-bibtex-get-style keyword))
(plist-get arguments :options)
(list (concat file ".bib")))))
(error "Executing bibtex2html failed"))
(and temp-file (delete-file temp-file))
;; Open produced HTML file, wrap references within a block and
;; return it.
(with-temp-buffer
(insert "<div id=\"bibliography\">\n<h2>References</h2>\n")
(insert-file-contents (concat file ".html"))
(insert "\n</div>")
;; Update `org-bibtex-html-keywords-alist'.
(push (cons keyword (buffer-string))
org-bibtex-html-keywords-alist)
;; Update `org-bibtex-html-entries-alist'.
(goto-char (point-min))
(while (re-search-forward
"a name=\"\\([-_a-zA-Z0-9:]+\\)\">\\(\\w+\\)" nil t)
(push (cons (match-string 1) (match-string 2))
org-bibtex-html-entries-alist)))))))
;; Return parse tree unchanged.
tree)
(eval-after-load 'ox
'(add-to-list 'org-export-filter-parse-tree-functions
'org-bibtex-process-bib-files))
(provide 'ox-bibtex)
;;; ox-bibtex.el ends here
|
