bug#61051: treesit-install-language-grammar can provide the default repository URL

[Eli Zaretskii]

> Date: Wed, 25 Jan 2023 16:00:48 +0200
> Cc: 61051@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> >> -        "Enter the URL of the Git repository of the language grammar: ")
> >> +        "Enter the URL of the Git repository of the language grammar: "
> >> +        (format"https://github.com/tree-sitter/tree-sitter-%s";  lang))
> >>           (empty-string-to-nil
> >>            (read-string
> >>             "Enter the tag or branch (default: default branch): "))
> > Sounds good, but wouldn't we confuse users in those cases where the
> > Tree-sitter site doesn't have a grammar?  Would it be perhaps feasible
> > to probe first that a Git repository at the URL exists?
> 
> Sure, how about this:

LGTM, thanks.