1 files changed, 43 insertions, 0 deletions

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+;; ABANDON ALL HOPE YE WHO ENTER HERE
+
+(defmacro remember-set (&rest symbols)
+  "Setup a closure remembering symbols to apply with
+`remember-reset'.  The variables will be renamed using TEMPLATE.
+SYMBOLS is a plist: the properties are symbols or mode names, and
+their values what to set after `remember-setup'."
+  (let* ((template (format "remember--%s-%%s" (gensym)))
+         (reset-fn (intern (format template "reset" "fn")))
+         (list (cl-loop for sym in symbols by #'cddr
+                        collect `(,(intern (format template sym))
+                                  ,sym)
+                        into let-list
+                        collect (let ((val (plist-get symbols sym)))
+                                  (cond ((eq val 'enable)
+                                         `(,sym +1))
+                                        ((eq val 'disable)
+                                         `(,sym -1))
+                                        (t `(setq-local ,sym ,val))))
+                        into fn-set-list
+                        collect (let ((val (plist-get symbols sym))
+                                      (rem (intern (format template sym))))
+                                  (cond ((memq val '(enable disable))
+                                         `(,sym (if ,rem +1 -1)))
+                                        (t `(setq-local ,sym ,rem))))
+                        into fn-reset-list
+                        finally return (list let-list
+                                             fn-reset-list
+                                             fn-set-list))))
+    `(progn
+       (defvar-local ,reset-fn nil
+         "Function to recall values from `remember-set'.")
+       (let ,(cl-first list)
+        (setf (symbol-function ',reset-fn)
+              (lambda ()
+                ,@(cl-second list))))
+       ,@(cl-third list)
+       ',reset-fn)))
+
+;; test
+
+(setq fn (remember-set display-fill-column-indicator-mode disable))
+(funcall fn)