GNU bug report logs - #45349
27.1.50; ruby-mode widens buffer when saving

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eric Hanchrow <eric.hanchrow <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1.50; ruby-mode widens buffer when saving
Date: Sun, 20 Dec 2020 18:59:58 -0800

[Message part 1 (text/plain, inline)]

put the following three lines of ruby code into /tmp/wat.rb

#####
def hey_you
  puts "So what"
end
####

start emacs with "emacs -nw"
visit the file:
  C-x C-f /tmp/wat.rb RET
add some spaces to the end of the second line:
  C-n C-e SPC SPC SPC
narrow to that second line:
  C-SPC
  M-m
  C-x n n
save the buffer:
  C-x C-s

You'll see that the buffer is no longer narrowed.

The fix is to simply add a "save-restriction" in the function
`ruby-mode-set-encoding`, like this

    modified   lisp/progmodes/ruby-mode.el
    @@ -794,6 +794,7 @@ ruby--encoding-comment-required-p
     (defun ruby-mode-set-encoding ()
       "Insert a magic comment header with the proper encoding if
necessary."
       (save-excursion
    +    (save-restriction
           (widen)
           (goto-char (point-min))
           (when (ruby--encoding-comment-required-p)
    @@ -811,7 +812,7 @@ ruby-mode-set-encoding
                       (t (when ruby-insert-encoding-magic-comment
                            (ruby--insert-coding-comment coding-system))))
                 (when (buffer-modified-p)
    -            (basic-save-buffer-1)))))))
    +              (basic-save-buffer-1))))))))

     (defvar ruby--electric-indent-chars '(?. ?\) ?} ?\]))


In GNU Emacs 27.1.50 (build 2, x86_64-pc-linux-gnu)
 of 2020-12-04 built on ip-10-0-0-79
Repository revision: a4dd03ebe918ebc9cfbbec70d8c8910fae822b42
Repository branch: emacs-27
System Description: Amazon Linux AMI 2018.03

Recent messages:
Saving file /mnt3/git-repos/3rd-party/emacs/lisp/progmodes/ruby-mode.el...
Wrote /mnt3/git-repos/3rd-party/emacs/lisp/progmodes/ruby-mode.el
ruby-mode-set-encoding
Mark set
Saving file /tmp/wat.rb...
Wrote /tmp/wat.rb
Mark set [2 times]
Saving file /tmp/wat.rb...
Wrote /tmp/wat.rb
Mark saved where search started

Configured using:
 'configure --without-x'

Configured features:
SOUND NOTIFY INOTIFY LIBSELINUX GNUTLS LIBXML2 ZLIB XIM MODULES THREADS
PDUMPER GMP

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  bug-reference-prog-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  projectile-mode: t
  savehist-mode: t
  elisp-slime-nav-mode: t
  shell-dirtrack-mode: t
  ws-butler-mode: t
  global-auto-revert-mode: t
  recentf-mode: t
  ido-everywhere: t
  tracking-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug sendmail log-view vc vc-dispatcher debug
backtrace cus-start cus-load eieio-opt speedbar sb-image ezimage dframe
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org-list org-faces org-entities org-version ob-emacs-lisp ob-core
ob-eval org-table ol org-keys org-compat org-macs org-loaddefs
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pcomplete parse-time iso8601 ls-lisp edit-list pp browse-kill-ring
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use-package-diminish use-package-bind-key bind-key easy-mmode
use-package-core finder-inf gh-common marshal eieio-compat regexp-opt rx
info tool-bar package easymenu browse-url url-handlers url-parse
auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache json subr-x map url-vars seq byte-opt gv bytecomp
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text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads inotify
multi-tty make-network-process emacs)

Memory information:
((conses 16 2175918 349601)
 (symbols 48 57407 6)
 (strings 32 270955 36472)
 (string-bytes 1 7444009)
 (vectors 16 62351)
 (vector-slots 8 1111470 121082)
 (floats 8 3152 11089)
 (intervals 56 132518 8142)
 (buffers 1000 55)
 (heap 1024 88222 6475))

[Message part 2 (text/html, inline)]

Message #10 received at 45349-done <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Eric Hanchrow <eric.hanchrow <at> gmail.com>, 45349-done <at> debbugs.gnu.org
Subject: Re: bug#45349: 27.1.50; ruby-mode widens buffer when saving
Date: Tue, 22 Dec 2020 03:17:49 +0200

Version: 28.1

Hi Eric,

On 21.12.2020 04:59, Eric Hanchrow wrote:
> put the following three lines of ruby code into /tmp/wat.rb
> 
> #####
> def hey_you
>    puts "So what"
> end
> ####
> 
> start emacs with "emacs -nw"
> visit the file:
>    C-x C-f /tmp/wat.rb RET
> add some spaces to the end of the second line:
>    C-n C-e SPC SPC SPC
> narrow to that second line:
>    C-SPC
>    M-m
>    C-x n n
> save the buffer:
>    C-x C-s
> 
> You'll see that the buffer is no longer narrowed.
> 
> The fix is to simply add a "save-restriction" in the function
> `ruby-mode-set-encoding`, like this

Thanks for the report, now fixed on master.

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