[PATCH] Add support for 'thing-at-point' to get URL at point

[Jim Porter <jporterbugs@gmail.com>]

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This is similar to Emacs bug#66752[1]. It would be nice if 
"(thing-at-point 'url)" would return the URL when point is over an Org 
link. With this, it's easier to write a function that copies (or browses 
to) the URL at point without coding so many special cases.

Attached is a patch with a regression test for it. Should this also get 
a NEWS entry?

[1] https://lists.gnu.org/archive/html/bug-gnu-emacs/2023-10/msg01628.html

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From 6bce84bd28253236eff8ef972ede7daf82f95a71 Mon Sep 17 00:00:00 2001
From: Jim Porter <itsjimporter@gmail.com>
Date: Mon, 6 Nov 2023 11:39:09 -0800
Subject: [PATCH] Add support for 'thing-at-point' to get URL at point

* lisp/org.el (thingatpt): Require.
(org--url-at-point): New function...
(org-mode): ... and add it to 'thing-at-point-provider-alist'.

* testing/lisp/test-org.el (test-org/thing-at-point/url): New test.
---
 lisp/org.el              | 10 ++++++++++
 testing/lisp/test-org.el | 10 ++++++++++
 2 files changed, 20 insertions(+)

diff --git a/lisp/org.el b/lisp/org.el
index 4eb6ad0ee..c7ecfc13a 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -81,6 +81,7 @@
 (require 'calendar)
 (require 'find-func)
 (require 'format-spec)
+(require 'thingatpt)
 
 (condition-case nil
     (load (concat (file-name-directory load-file-name)
@@ -4948,6 +4949,11 @@ The following commands are available:
             #'pcomplete-completions-at-point nil t)
   (setq-local buffer-face-mode-face 'org-default)
 
+  ;; `thing-at-point' support
+  (setq-local thing-at-point-provider-alist
+              (append thing-at-point-provider-alist
+                      '((url . org--url-at-point))))
+
   ;; If empty file that did not turn on Org mode automatically, make
   ;; it to.
   (when (and org-insert-mode-line-in-empty-file
@@ -8611,6 +8617,10 @@ there is one, return it."
 	   (setq link (nth (1- nth) links)))))
        (cons link end)))))
 
+(defun org--url-at-point ()
+  "`thing-at-point' provider function."
+  (org-element-property :raw-link (org-element-context)))
+
 ;;; File search
 
 (defun org-do-occur (regexp &optional cleanup)
diff --git a/testing/lisp/test-org.el b/testing/lisp/test-org.el
index 21b850c03..2fe4477a3 100644
--- a/testing/lisp/test-org.el
+++ b/testing/lisp/test-org.el
@@ -3583,6 +3583,16 @@ Foo Bar
 	     (org-open-at-point))
 	 nil)))))
 
+\f
+;;; Thing at point
+
+(ert-deftest test-org/thing-at-point/url ()
+  "Test that `thing-at-point' returns the URL at point."
+  (should
+   (org-test-with-temp-text
+       "[[https://www.gnu.org/software/emacs/][GNU Emacs]]"
+     (string= (thing-at-point 'url) "https://www.gnu.org/software/emacs/"))))
+
 \f
 ;;; Node Properties
 
-- 
2.25.1