[O] patch for custom colored links in org-mode

[John Kitchin]

Hi all,

I tried this aproach to enable custom colored links in org-mode if an
org-link-type face is defined. If no face is applied, then it just gets
the default org-link face

For example this will make all doi links red.

(defface org-link-doi
  `((t (:inherit org-link
                 :foreground "red")))
  "Color for doi links.")

It seems to work pretty well for me. What do you think about making this
a feature in org-mode?

diff --git a/lisp/org.el b/lisp/org.el
index af68539..f1c500d 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -5851,14 +5851,19 @@ prompted for."
   "Add link properties for plain links."
   (when (and (re-search-forward org-plain-link-re limit t)
             (not (org-in-src-block-p)))
-    (let ((face (get-text-property (max (1- (match-beginning 0)) (point-min))
-                                  'face))
-         (link (org-match-string-no-properties 0)))
+    (let* ((face (get-text-property (max (1- (match-beginning 0)) (point-min))
+                                   'face))
+          (link (org-match-string-no-properties 0))
+          (type (org-match-string-no-properties 1))
+          (link-face-symbol (intern (format "org-link-%s" type)))
+          (link-face (if (facep link-face-symbol)
+                         link-face-symbol
+                       'org-link)))
       (unless (if (consp face) (memq 'org-tag face) (eq 'org-tag face))
        (org-remove-flyspell-overlays-in (match-beginning 0) (match-end 0))
        (add-text-properties (match-beginning 0) (match-end 0)
                             (list 'mouse-face 'highlight
-                                  'face 'org-link
+                                  'face link-face
                                   'htmlize-link `(:uri ,link)
                                   'keymap org-mouse-map))
        (org-rear-nonsticky-at (match-end 0))
@@ -6340,8 +6345,8 @@ needs to be inserted at a specific position in the 
font-lock sequence.")
           ;; Links
           (if (memq 'tag lk) '(org-activate-tags (1 'org-tag prepend)))
           (if (memq 'angle lk) '(org-activate-angle-links (0 'org-link t)))
-          (if (memq 'plain lk) '(org-activate-plain-links (0 'org-link t)))
-          (if (memq 'bracket lk) '(org-activate-bracket-links (0 'org-link t)))
+          (if (memq 'plain lk) '(org-activate-plain-links (0 'org-link)))
+          (if (memq 'bracket lk) '(org-activate-bracket-links (0 'org-link)))
           (if (memq 'radio lk) '(org-activate-target-links (1 'org-link t)))
           (if (memq 'date lk) '(org-activate-dates (0 'org-date t)))
           (if (memq 'footnote lk) '(org-activate-footnote-links))


-- 
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu