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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: project-find-regexp using ripgrep
Date: Mon, 22 Jun 2020 05:30:11 +0300
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To: Dmitry Gutov <dgutov@yandex.ru>
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In-Reply-To: <15b1e532-99e7-5f43-defc-3c32072af3d6@yandex.ru> (message from
 Dmitry Gutov on Mon, 22 Jun 2020 03:01:42 +0300)
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> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Mon, 22 Jun 2020 03:01:42 +0300
> Cc: emacs-devel <emacs-devel@gnu.org>
> 
> +(defcustom xref-search-command-template xref-grep-search-template
> +  "Command template to search a list of files piped from stdin.
> +
> +Allowed fields:
> +
> +  <C> for extra arguments such as -i and --color
> +  <R> for the regexp itself (in Extended format)"
> +  :type `(choice
> +          (const :tag "Use Grep" ,xref-grep-search-template)
> +          (const :tag "Use ripgrep" ,xref-ripgrep-search-template)
> +          (string :tag "User defined")))

Please don't forget the :version tag.

Also, I think this new option should be in NEWS.

Thanks.