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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