urlify doi entries in bibtex

init-bibtex-mode.el

;; A better version of this is now upstream!  See comments.

;; bibtex-mode
(add-hook 'bibtex-mode-hook
          (lambda ()
            (setq bibtex-generate-url-list
                  (cons (list '("doi" . "10\\.[0-9]+/.+")
                              (concat (or org-doi-server-url "http://dx.doi.org/") "%s")
                              '("doi" "10\\.[0-9]+/.+" 0))
                        bibtex-generate-url-list)

                  bibtex-font-lock-url-regexp
                  (concat "^[ \t]*"
                          (regexp-opt (delete-dups (mapcar 'caar bibtex-generate-url-list)) t)
                          "[ \t]*=[ \t]*"))))

Upstream: http://bzr.savannah.gnu.org/lh/emacs/trunk/revision/113167