Emacs: Ask to update copyright years in prog-mode.

init.d/programming/common.el

@@ -1,6 +1,6 @@
 ;;; common.el --- Common programming settings. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-01-27T09:13:20+0100>
+;; Time-stamp: <2020-01-28T03:25:54+0100>
 
 ;;; Commentary:
 
@@ -27,6 +27,17 @@
   ;; Switch between header and implementation.
   ("C-:"     . ff-find-other-file)
   )
+(use-package copyright
+  :config
+  (defun my/maybe-copyright-update ()
+    "Update existing copyright notice to indicate the current
+year if mode is derived from prog-mode."
+    (if (derived-mode-p 'prog-mode)
+        (copyright-update)))
+
+  :hook
+  (before-save . my/maybe-copyright-update)
+  )
 
 ;; Guess indentation and if spaces or tabs are to be used.
 (use-package dtrt-indent