bug#10165: [PATCH] Allow setting corner in mouse avoidance mode.

[Thierry Volpiatto]

> Hi all,
> there was nothing except modifying function
> `mouse-avoidance-banish-destination' to set in which corner mouse is
> banish.
> This patch allow setting this through
> `mouse-avoidance-banish-destination' user variable like this:
> (left . top) or (right . bottom) etc...

Thanks.  We're in feature freeze---please file this in the bug database
so it doesn't get forgotten.

# HG changeset patch
# User Thierry Volpiatto <thierry.volpiatto@gmail.com>
# Date 1322632617 -3600
# Node ID 885228e9f341f392fc6886bf2855a66c5bdba6c5
# Parent  c511f9c3f7a2cab8b3684b2f1ea4782176988ac6
* lisp/avoid.el:  Allow setting in which corner banish move the mouse.
(mouse-avoidance-banish-destination): New user variable, a cons pair to specify 
banish corner position.
(mouse-avoidance-banish-destination): Set destination according to 
mouse-avoidance-banish-destination value.

diff --git a/lisp/avoid.el b/lisp/avoid.el
--- a/lisp/avoid.el
+++ b/lisp/avoid.el
@@ -115,6 +115,11 @@
   :type 'integer
   :group 'avoid)
 
+(defcustom mouse-avoidance-banish-destination '(left . top)
+  "Set the position to which Mouse Avoidance mode `banish' moves the mouse."
+  :group 'avoid
+  :type 'list)
+
 ;; Internal variables
 (defvar mouse-avoidance-state nil)
 (defvar mouse-avoidance-pointer-shapes nil)
@@ -183,10 +188,18 @@
 
 (defun mouse-avoidance-banish-destination ()
   "The position to which Mouse Avoidance mode `banish' moves the mouse.
-You can redefine this if you want the mouse banished to a different corner."
-  (let* ((pos (window-edges)))
-    (cons (- (nth 2 pos) 2)
-         (nth 1 pos))))
+If you want the mouse banished to a different corner set
+`mouse-avoidance-banish-destination' as you need."
+  (let* ((pos     (loop for v in (window-edges)
+                        for k in '(left top right bottom)
+                        collect (cons k v)))
+         (side    (car mouse-avoidance-banish-destination))
+         (up-down (cdr mouse-avoidance-banish-destination))
+         (fn      (case side
+                    (left '+)
+                    (right '-))))
+    (cons (funcall fn (assoc-default side pos) 2)
+         (assoc-default up-down pos))))
 
 (defun mouse-avoidance-banish-mouse ()
   ;; Put the mouse pointer in the upper-right corner of the current frame.

-- 
  Thierry
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