Re: [PATCH] Add shell-quasiquote.

[Paul Eggert]

Taylan Ulrich Bayırlı/Kammer wrote:
> Please tell me which shells shell-quote-argument is guaranteed to work
> safely on

Nobody can tell you that. What we can tell you is that shell-quote-argument 
works on a superset of uses that shqq--quote-string works on. The trust-based 
arguments against using shell-quote-argument all apply, with greater force, 
against using shqq--quote-string. For example, shqq--quote-string is more 
vulnerable to code-injection attacks than shell-quote-argument is.

I am not a fan of non-POSIX shells. They are a hassle to deal with and can cause 
significant problems in Emacs maintenance. In areas where they are a significant 
problem, we don't need to support them. But this particular instance is not a 
significant problem. Emacs already has a portable, tested, easy-to-use function 
to quote shell arguments, and there's good reason to use it here.