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+;;; acdw-autoinsert.el --- autoinsert.el            -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021  Case Duckworth
+
+;; Author: Case Duckworth <acdw@acdw.ne
+
+;;; License:
+
+;; Everyone is permitted to do whatever with this software, without
+;; limitation.  This software comes without any warranty whatsoever,
+;; but with two pieces of advice:
+
+;; - Be kind to yourself.
+
+;; - Make good choices.
+
+;;; Commentary:
+
+;; These are my bespoke changes to the `autoinsert' library.
+
+;;; Code:
+
+(require 'autoinsert)
+(require 'cl-lib)
+
+(defun acdw/define-auto-insert (options condition action)
+  "Associate CONDITION with ACTION in `auto-insert-alist'.
+This function differs from `define-auto-insert' in that it won't
+allow more than one duplicate entry in `auto-insert-alist'.
+
+OPTIONS is a plist with three optional arguments:
+
+- `:testfn' takes a function to test the given CONDITION against
+  the already-existing ones in `auto-insert-alist'.  It defaults
+  to testing the cdr of CONDITION against the cdar of each entry
+  in `auto-insert-alist'.
+
+- `:replace', if non-nil, will replace the matching entry with
+  the given one.  Default: nil.
+
+- `:after' is the third, optional argument to `define-auto-insert'."
+  (declare (indent 1))
+  (let ((testfn (or (plist-get options :testfn)
+                    (lambda (a b)
+                      (string= (cdr a) (cdar b)))))
+        (replace (or (plist-get options :replace) nil))
+        (after (or (plist-get options :after) nil)))
+    (when replace
+      (setq auto-insert-alist
+            (assoc-delete-all condition auto-insert-alist testfn)))
+    (unless (assoc (list condition) auto-insert-alist testfn) 
+      (define-auto-insert condition action after))))
+
+(provide 'acdw-autoinsert)
+;;; acdw-autoinsert.el ends here