doi proxy , a test patch

[Fabrice Pardo <fabrice.pardo@lpn.cnrs.fr>]

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Hi,

My institution library permits direct access to abstracts
with pdf contents if we access to article through an address like 
http://dx.doi.org.my.instituti.on/... instead of http://dx.doi.org/...

In the attached patch, I have defined a new variable org-doi-proxy
which can be customized by the user.


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diff --git a/lisp/org.el b/lisp/org.el
index 05f5375..c5d17a9 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -1838,6 +1838,10 @@ For more examples, see the system specific constants
 			(string :tag "Command")
 			(sexp :tag "Lisp form")))))
 
+(defcustom org-doi-proxy "http://dx.doi.org/"
+  "The doi proxy"
+  :group 'org-link-follow
+  :type 'string)
 
 
 (defgroup org-refile nil
@@ -9714,7 +9718,7 @@ application the system uses for this file type."
 					 path))))
 
 	 ((string= type "doi")
-	  (browse-url (concat "http://dx.doi.org/" (if (org-string-match-p "[[:nonascii:] ]" path)
+	  (browse-url (concat org-doi-proxy (if (org-string-match-p "[[:nonascii:] ]" path)
 						       (org-link-escape
 							path org-link-escape-chars-browser)
 						     path))))