GNU bug report logs - #48043
UTF-8 magic comment is unwelcome with recent Ruby versions

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From: Peter Oliver <p.d.oliver <at> mavit.org.uk>
To: 48043 <at> debbugs.gnu.org
Subject: bug#48043: UTF-8 magic comment is unwelcome with recent Ruby versions
Date: Mon, 26 Apr 2021 19:28:21 +0100 (BST)

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

When saving a ruby-mode buffer, if the content is not plain ASCII, then the default behaviour is to add a specially-formatted comment that indicates the encoding to the Ruby interpreter.  E.g.,

# coding: utf-8

However, since Ruby 2.0 released in 2013, the default encoding for Ruby has been UTF-8.  Consequently, users of other editors tend not to include this comment when using UTF-8.  When you edit such a file with Emacs, you end up with a messy diff.

Two patches are attached to address this:

- The first patch adds a new choice to ruby-insert-encoding-magic-comment, unless-utf8, which causes the magic comment not to be inserted if the encoding is UTF-8.

- The second patch, perhaps more controversially, makes this the default.

-- 
Peter Oliver

[0001-New-choice-for-ruby-insert-encoding-magic-comment-un.patch (text/plain, attachment)]

[0002-Default-ruby-insert-encoding-magic-comment-to-unless.patch (text/plain, attachment)]

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