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Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3
From: |
João Távora |
Subject: |
Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3 |
Date: |
Fri, 10 Jul 2020 20:57:00 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
João Távora <joaotavora@gmail.com> writes:
> Noam Postavsky <npostavs@gmail.com> writes:
>>> makunbound, as Noam suggested, doesn't work.
>>> Is there an easy way to "unlocalize" a symbol?
>> Oh, maybe kill-local-variable?
>
> No, that doesn't work either. I was looking at data.c and alloc.c and
> Maybe come up with a better idea, or maybe, like Stefan suggests, don't
> make it an alias at all, just deprecate it and keep using it instead of
> eldoc-documentation-strategy when we find it to be bound.
That sort of works, but it forces extensions that do want to
"Package-Require" eldoc to remember to unbind
eldoc-documentation-function if they are loaded on older Emacs versions,
which is undesirable.
So I think a better plan is just to reverse the variable alias on older
Emacs versions. Attaching the patch that does this:
commit b7019ed5e76dda40642db1b20d3dd1484b2536e6
Author: João Távora <joaotavora@gmail.com>
Date: Fri Jul 10 20:49:54 2020 +0100
Sort out Eldoc backward compatibility of eldoc-documentation-function
Use eldoc--documentation-strategy-defcustom to decide in which
direction to make the variable alias, depending on the Emacs version.
* lisp/emacs-lisp/eldoc.el
(eldoc--documentation-strategy-defcustom): Helper macro.
(eldoc-documentation-strategy, eldoc-documentation-function): Use it.
(Version): Bump to 1.5.0
diff --git a/lisp/emacs-lisp/eldoc.el b/lisp/emacs-lisp/eldoc.el
index 7964c4c45a..ccae09a906 100644
--- a/lisp/emacs-lisp/eldoc.el
+++ b/lisp/emacs-lisp/eldoc.el
@@ -5,7 +5,7 @@
;; Author: Noah Friedman <friedman@splode.com>
;; Keywords: extensions
;; Created: 1995-10-06
-;; Version: 1.4.0
+;; Version: 1.5.0
;; Package-Requires: ((emacs "26.3"))
;; This is a GNU ELPA :core package. Avoid functionality that is not
@@ -535,10 +535,27 @@ eldoc-documentation-enthusiast
(if (stringp str) (funcall callback str))
nil))))
-(define-obsolete-variable-alias 'eldoc-documentation-function
- 'eldoc-documentation-strategy "eldoc-1.1.0")
-
-(defcustom eldoc-documentation-strategy #'eldoc-documentation-default
+;; JT@2020-07-10: Eldoc is pre-loaded, so in in Emacs < 28 we can't
+;; make the "old" `eldoc-documentation-function' point to the new
+;; `eldoc-documentation-strategy', so we do the reverse. This allows
+;; for Eldoc to be loaded in those older Emacs versions and work with
+;; whomever (major-modes, extensions, ueser) sets one of the other
+;; variable.
+(defmacro eldoc--documentation-strategy-defcustom
+ (main secondary value docstring &rest more)
+ "Defcustom helper macro for sorting `eldoc-documentation-strategy'."
+ (declare (indent 2))
+ `(if (< emacs-major-version 28)
+ (progn
+ (defcustom ,secondary ,value ,docstring ,@more)
+ (defvaralias ',main ',secondary ,docstring))
+ (progn
+ (defcustom ,main ,value ,docstring ,@more)
+ (defvaralias ',secondary ',main ,docstring))))
+
+(eldoc--documentation-strategy-defcustom eldoc-documentation-strategy
+ eldoc-documentation-function
+ #'eldoc-documentation-default
"How to collect and organize results of `eldoc-documentation-functions'.
This variable controls how `eldoc-documentation-functions', which
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, Glenn Morris, 2020/07/10
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, João Távora, 2020/07/10
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, Noam Postavsky, 2020/07/10
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, João Távora, 2020/07/10
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3,
João Távora <=
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, Stefan Monnier, 2020/07/10
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, João Távora, 2020/07/10
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, Stefan Monnier, 2020/07/10
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, João Távora, 2020/07/10
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, Stefan Monnier, 2020/07/10
- Re: master 9ade7ea: Fix Eldoc problem when loading on Emacs 26.3, João Távora, 2020/07/11