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;;; ol-doi.el --- DOI links support in Org -*- lexical-binding: t; -*-
;; Copyright (C) 2021 Free Software Foundation, Inc.
;; Author: Nicolas Goaziou <mail@nicolasgoaziou.fr>
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This library introduces the "doi" link type in Org, and provides
;; code for opening and exporting such links.
;;; Code:
(require 'ol)
(defcustom org-link-doi-server-url "https://doi.org/"
"The URL of the DOI server."
:group 'org-link-follow
:version "24.3"
:type 'string
:safe #'stringp)
(defun org-link-doi-open (path arg)
"Open a \"doi\" type link.
PATH is a the path to search for, as a string."
(browse-url (url-encode-url (concat org-link-doi-server-url path)) arg))
(defun org-link-doi-export (path desc backend info)
"Export a \"doi\" type link.
PATH is the DOI name. DESC is the description of the link, or
nil. BACKEND is a symbol representing the backend used for
export. INFO is a a plist containing the export parameters."
(let ((uri (concat org-link-doi-server-url path)))
(pcase backend
(`html
(format "<a href=\"%s\">%s</a>" uri (or desc uri)))
(`latex
(if desc (format "\\href{%s}{%s}" uri desc)
(format "\\url{%s}" uri)))
(`ascii
(if (not desc) (format "<%s>" uri)
(concat (format "[%s]" desc)
(and (not (plist-get info :ascii-links-to-notes))
(format " (<%s>)" uri)))))
(`texinfo
(if (not desc) (format "@uref{%s}" uri)
(format "@uref{%s, %s}" uri desc)))
(_ uri))))
(org-link-set-parameters "doi"
:follow #'org-link-doi-open
:export #'org-link-doi-export)
(provide 'org-link-doi)
(provide 'ol-doi)
;;; ol-doi.el ends here
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