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Fix handling of defcustom :local tag

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For discussion, see the following emacs-devel thread:
https://lists.gnu.org/r/emacs-devel/2020-11/msg00734.html

* lisp/custom.el (custom-declare-variable): Delay call to
make-variable-buffer-local until after user option has been
initialized with a value.  Otherwise the user option may be
initialized to nil.
* test/lisp/custom-tests.el (custom--test-local-option)
(custom--test-permanent-option): New :local user options.
(custom-test-local-option): New test for defcustom :local keyword.
This commit is contained in:
Basil L. Contovounesios 2020-11-18 12:53:03 +00:00
parent b2ee665024
commit dea3d6aa18
2 changed files with 45 additions and 3 deletions
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10
lisp/custom.el
View file

@ -157,7 +157,9 @@ set to nil, as the value is no longer rogue."
(if (keywordp doc)
(error "Doc string is missing"))
(let ((initialize #'custom-initialize-reset)
(requests nil))
(requests nil)
;; Whether automatically buffer-local.
buffer-local)
(unless (memq :group args)
(custom-add-to-group (custom-current-group) symbol 'custom-variable))
(while args
@ -183,7 +185,7 @@ set to nil, as the value is no longer rogue."
(put symbol 'safe-local-variable value))
((eq keyword :local)
(when (memq value '(t permanent))
(make-variable-buffer-local symbol))
(setq buffer-local t))
(when (eq value 'permanent)
(put symbol 'permanent-local t)))
((eq keyword :type)
@ -205,7 +207,9 @@ set to nil, as the value is no longer rogue."
(put symbol 'custom-requests requests)
;; Do the actual initialization.
(unless custom-dont-initialize
(funcall initialize symbol default)))
(funcall initialize symbol default))
(when buffer-local
(make-variable-buffer-local symbol)))
(run-hooks 'custom-define-hook)
symbol)

38
test/lisp/custom-tests.el
View file

@ -151,4 +151,42 @@
(widget-apply field :value-to-internal origvalue)
"bar"))))))
(defcustom custom--test-local-option 'initial
"Buffer-local user option for testing."
:group 'emacs
:type '(choice (const initial) (const changed))
:local t)
(defcustom custom--test-permanent-option 'initial
"Permanently local user option for testing."
:group 'emacs
:type '(choice (const initial) (const changed))
:local 'permanent)
(ert-deftest custom-test-local-option ()
"Test :local user options."
;; Initial default values.
(should (eq custom--test-local-option 'initial))
(should (eq custom--test-permanent-option 'initial))
(should (eq (default-value 'custom--test-local-option) 'initial))
(should (eq (default-value 'custom--test-permanent-option) 'initial))
(let ((obuf (current-buffer)))
(with-temp-buffer
;; Changed buffer-local values.
(setq custom--test-local-option 'changed)
(setq custom--test-permanent-option 'changed)
(should (eq custom--test-local-option 'changed))
(should (eq custom--test-permanent-option 'changed))
(should (eq (default-value 'custom--test-local-option) 'initial))
(should (eq (default-value 'custom--test-permanent-option) 'initial))
(with-current-buffer obuf
(should (eq custom--test-local-option 'initial))
(should (eq custom--test-permanent-option 'initial)))
;; Permanent variable remains unchanged.
(kill-all-local-variables)
(should (eq custom--test-local-option 'initial))
(should (eq custom--test-permanent-option 'changed))
(should (eq (default-value 'custom--test-local-option) 'initial))
(should (eq (default-value 'custom--test-permanent-option) 'initial)))))
;;; custom-tests.el ends here