bug#36539: elec-pair.elc gets surreptitiously loaded (almost) unconditionally at start up.

[Noam Postavsky <npostavs@gmail.com>]

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tags 36539 + patch
quit

Alan Mackenzie <acm@muc.de> writes:

> A decision should be taken as to whether elec-pair.elc should be loaded
> at start up, and if so, it should be part of the dump.  If not, the
> `require' form in elisp-mode.el should be replaced by an
> `eval-after-load' form.

I think it's clear that elec-pair should not be part of the dump, since
electric-pair-mode is not turned on by default.  Looking at the git log,
it seems I added the require to avoid some bootstrapping problems with
Bug#24901, but we can move the electric-pair-text-pairs manipulation to
a hook instead:


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From cf6057cb5bf6a44d718349776e370b225bc7079f Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Sun, 7 Jul 2019 12:22:37 -0400
Subject: [PATCH] Don't load elec-pair in elisp-mode (Bug#36539)

* lisp/progmodes/elisp-mode.el (emacs-lisp-set-electric-text-pairs):
New function.
(emacs-lisp-mode): Add it to electric-pair-mode-hook.
---
 lisp/progmodes/elisp-mode.el | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/lisp/progmodes/elisp-mode.el b/lisp/progmodes/elisp-mode.el
index c86277a309..7c77c34b50 100644
--- a/lisp/progmodes/elisp-mode.el
+++ b/lisp/progmodes/elisp-mode.el
@@ -233,6 +233,12 @@ emacs-lisp-mode-hook
   :type 'hook
   :group 'lisp)
 
+(defun emacs-lisp-set-electric-text-pairs ()
+  (defvar electric-pair-text-pairs)
+  (setq-local electric-pair-text-pairs
+              (append '((?\` . ?\') (?‘ . ?’)) electric-pair-text-pairs))
+  (remove-hook 'electric-pair-mode-hook #'emacs-lisp-set-electric-text-pairs t))
+
 ;;;###autoload
 (define-derived-mode emacs-lisp-mode prog-mode "Emacs-Lisp"
   "Major mode for editing Lisp code to run in Emacs.
@@ -245,12 +251,8 @@ emacs-lisp-mode
   (defvar project-vc-external-roots-function)
   (lisp-mode-variables nil nil 'elisp)
   (add-hook 'after-load-functions #'elisp--font-lock-flush-elisp-buffers)
-  (unless noninteractive
-    (require 'elec-pair)
-    (defvar electric-pair-text-pairs)
-    (setq-local electric-pair-text-pairs
-                (append '((?\` . ?\') (?‘ . ?’)) electric-pair-text-pairs))
-    (setq-local electric-quote-string t))
+  (add-hook 'electric-pair-mode-hook #'emacs-lisp-set-electric-text-pairs t)
+  (setq-local electric-quote-string t)
   (setq imenu-case-fold-search nil)
   (add-function :before-until (local 'eldoc-documentation-function)
                 #'elisp-eldoc-documentation-function)
-- 
2.11.0