bug#50256: thing-at-mouse

[Juri Linkov]

> I'm not quite sure I understand how such a function would look like.
> `thing-at-point' has the signature
>
>  (thing-at-point THING)
>
> Would the proposed new function have a signature
>
>  (thing-at-mouse EVENT THING)
>
> ?

This looks like the right signature.  Then the implementation
and an example of usage could look like this:

diff --git a/lisp/thingatpt.el b/lisp/thingatpt.el
index ab17748df5..536eef5406 100644
--- a/lisp/thingatpt.el
+++ b/lisp/thingatpt.el
@@ -151,6 +151,15 @@ bounds-of-thing-at-point
                (if (and (<= real-beg orig) (<= orig end) (< real-beg end))
                    (cons real-beg end))))))))))
 
+;;;###autoload
+(defun thing-at-mouse (event thing &optional no-properties)
+  "Return the THING at mouse click.
+Like `thing-at-point', but reacts to the event
+where the mouse button is clicked."
+  (save-excursion
+    (mouse-set-point last-input-event)
+    (thing-at-point thing no-properties)))
+
 ;;;###autoload
 (defun thing-at-point (thing &optional no-properties)
   "Return the THING at point.
diff --git a/lisp/net/dictionary.el b/lisp/net/dictionary.el
index f33cbaf112..c9b2bdeaf1 100644
--- a/lisp/net/dictionary.el
+++ b/lisp/net/dictionary.el
@@ -1368,5 +1367,14 @@ global-dictionary-tooltip-mode
                     (if on #'dictionary-tooltip-track-mouse #'ignore))
     on))
 
+(defun context-menu-dictionary (menu)
+  "Dictionary context menu."
+  (when (thing-at-mouse last-input-event 'word)
+    (define-key menu [dictionary-separator] menu-bar-separator)
+    (define-key menu [dictionary-search-word-at-mouse]
+      '(menu-item "Dictionary Search" dictionary-search-word-at-mouse
+                  :help "Search the word at mouse click in dictionary")))
+  menu)
+
 (provide 'dictionary)
 ;;; dictionary.el ends here