update emacs config to 21th century

conf-lisp/occur.el

@@ -0,0 +1,15 @@
+;; *** Occur
+;; https://oremacs.com/2015/01/26/occur-dwim/
+;; https://github.com/abo-abo/hydra/wiki/Emacs
+(defun occur-dwim ()
+  "Call `occur' with a sane default, chosen as the thing under point or selected region"
+  (interactive)
+  (push (if (region-active-p)
+            (buffer-substring-no-properties
+             (region-beginning)
+             (region-end))
+          (let ((sym (thing-at-point 'symbol)))
+            (when (stringp sym)
+              (regexp-quote sym))))
+        regexp-history)
+  (call-interactively 'occur))