org-element: Externalize docview links

* lisp/org-element.el (org-element-link-type-is-file): Remove.
(org-element-link-parser): Do not treat specially anymore "docview"
link type.

* testing/lisp/test-org-element.el (test-org-element/link-parser):
  Update test.

* lisp/org-docview.el (org-docview-export): Fix path.

"docview" is a custom link type handled in its own library.  There is
no reason to include it in core parser.

lisp/org-docview.el

@@ -1,6 +1,6 @@
 ;;; org-docview.el --- support for links to doc-view-mode buffers
 
-;; Copyright (C) 2009-2014 Free Software Foundation, Inc.
+;; Copyright (C) 2009-2015 Free Software Foundation, Inc.
 
 ;; Author: Jan Böcker <jan.boecker at jboecker dot de>
 ;; Keywords: outlines, hypermedia, calendar, wp
@@ -54,8 +54,8 @@
 
 (defun org-docview-export (link description format)
   "Export a docview link from Org files."
-  (let* ((path (when (string-match "\\(.+\\)::.+" link)
-		 (match-string 1 link)))
+  (let* ((path (if (string-match "\\(.+\\)::.+" link) (match-string 1 link)
+		 link))
          (desc (or description link)))
     (when (stringp path)
       (setq path (org-link-escape (expand-file-name path)))

lisp/org-element.el

@@ -1,6 +1,6 @@
 ;;; org-element.el --- Parser And Applications for Org syntax
 
-;; Copyright (C) 2012-2014 Free Software Foundation, Inc.
+;; Copyright (C) 2012-2015 Free Software Foundation, Inc.
 
 ;; Author: Nicolas Goaziou <n.goaziou at gmail dot com>
 ;; Keywords: outlines, hypermedia, calendar, wp
@@ -260,12 +260,6 @@ specially in `org-element--object-lex'.")
 Names must be uppercase.  Any block whose name has no association
 is parsed with `org-element-special-block-parser'.")
 
-(defconst org-element-link-type-is-file
-  '("file" "file+emacs" "file+sys" "docview")
-  "List of link types equivalent to \"file\".
-Only these types can accept search options and an explicit
-application to open them.")
-
 (defconst org-element-affiliated-keywords
   '("CAPTION" "DATA" "HEADER" "HEADERS" "LABEL" "NAME" "PLOT" "RESNAME" "RESULT"
     "RESULTS" "SOURCE" "SRCNAME" "TBLNAME")
@@ -3071,22 +3065,16 @@ Assume point is at the beginning of the link."
       (save-excursion
 	(setq post-blank (progn (goto-char link-end) (skip-chars-forward " \t"))
 	      end (point))
-	;; Special "file" type link processing.
-	(when (member type org-element-link-type-is-file)
-	  ;; Extract opening application and search option.
-	  (cond ((string-match "^file\\+\\(.*\\)$" type)
-		 (setq application (match-string 1 type)))
-		((not (string-match "^file" type))
-		 (setq application type)))
+	;; Special "file" type link processing.  Extract opening
+	;; application and search option, if any.  Also normalize URI.
+	(when (string-match "\\`file\\(?:\\+\\(.+\\)\\)?\\'" type)
+	  (setq application (match-string 1 type) type "file")
 	  (when (string-match "::\\(.*\\)\\'" path)
 	    (setq search-option (match-string 1 path)
 		  path (replace-match "" nil nil path)))
-	  ;; Normalize URI.
 	  (when (and (file-name-absolute-p path)
 		     (not (org-string-match-p "\\`[/~]/" path)))
-	    (setq path (concat "//" path)))
-	  ;; Make sure TYPE always reports "file".
-	  (setq type "file"))
+	    (setq path (concat "//" path))))
 	(list 'link
 	      (list :type type
 		    :path path

testing/lisp/test-org-element.el

@@ -1,6 +1,6 @@
 ;;; test-org-element.el --- Tests for org-element.el
 
-;; Copyright (C) 2012, 2013, 2014  Nicolas Goaziou
+;; Copyright (C) 2012-2015  Nicolas Goaziou
 
 ;; Author: Nicolas Goaziou <n.goaziou at gmail dot com>
 
@@ -1495,8 +1495,8 @@ e^{i\\pi}+1=0
   (require 'org-docview)
   (should
    (equal
-    '("file" "projects.org" "docview")
-    (org-test-with-temp-text "[[docview:projects.org]]"
+    '("file" "projects.org" "emacs")
+    (org-test-with-temp-text "[[file+emacs:projects.org]]"
       (let ((l (org-element-context)))
 	(list (org-element-property :type l)
 	      (org-element-property :path l)