(Proposal) new package option: redefine \qty command

[yuishin-kikuchi]

New version, siunitx v3 (2021-05-20) avoids overwriting \qty command of physics package.
On the other hand, \qty command of physics package is a just alias of \quantity command.
Thus, even if siunitx overwrites \qty, \quantity still can be used.
And \newcommand{\qtty}{\quantity} works fine.

So, I propose new package option(s):
% (load physics before siunitx)
\usepackage[qty]{siunitx} % when physics package loaded, overwrite \qty.

[syvshc]

yeah, package physics and siunitx both are important in my article. Now I have to use \usepackage{siunitx}[=v2], but I don't know if this option will disappear

[josephwright]

I've supported v1-from-v2 for 10+ years - I expect \usepackage{siunitx}[=v2] to stay for the life of v3, which I expect to be 'for ever' (I don't imagine ever doing another re-write).

[deadundead]

You should be able to fix it this way:
download the direct install archive from CTAN, and put the file siunitx.sty into your document folder.
Then change the code according to this commit.
deadundead@741a1f1
I believe the author has his reasons for not using '\RenewDocumentCommand', but I needed that to work.
This will override the physics package \qty command.

[boyoungzheng]

I prefer to have \qty from physics not overwritten. Change the name from \qty to \qtty or siqty or whatever in siunitx would work better for me.

[boyoungzheng]

It looks like I need to use \SI etc. for now. But I cannot find the old documentation anywhere. Can you please help? Thanks!

[josephwright]

@boyoungzheng As described in Compatibility with other packages, you will need to use \SI with the physics package. I will be retaining \SI in perpetuity - I simply don't recommend it for new documents. (The physics package is highly problematic, and so I don't recommend it either!)

[josephwright]

@boyoungzheng I will not be providing name other than \qty/\SI, but I am still thinking about how best to cover the various requirements of back-compability but also allowing use of \qty from siunitx with the physics package loaded.

[boyoungzheng]

Thanks for the reply! I understand I have to use \SI for my need. The problem is, I cannot find the old user manual explaining the use of it. Maybe add the old user manual to the v2 branch here?

[josephwright]

@boyoungzheng Like I said, I would strongly hope that no new documents are using physics. The \SI command is (essentially) the same as \qty: that's why I only mention \SI very briefly in the latest manual.

[josephwright]

I will improve the advice for v3.1 - there will be a clear instruction on how to proceed in the log. I don't feel I can go any further: physics is entitled to use the command name \qty, and as the semantics are entirely different, I can't simply no allow loading of both packages (cf. units, for example).

[guillaume-mueller]

For me it remains one issue : the warning (which I suppose refers to what you call the "log") stays whatever I do.

How to clear it ?

[josephwright]

For me it remains one issue : the warning (which I suppose refers to what you call the "log") stays whatever I do.

How to clear it ?

What message?

[guillaume-mueller]

Package siunitx Warning: Detected the "physics" package: omitting definition of \qty. If you want to use \qty with the siunitx definition, add \AtBeginDocument{\RenewCommandCopy\qty\SI} to your preamble.

[josephwright]

@guillaume-mueller This can be done using message redirection

\ExplSyntaxOn
\msg_redirect_name:nnn{siunitx}{physics-pkg}{none}
\ExplSyntaxOn

[TheFermi0n]

@guillaume-mueller This can be done using message redirection

\ExplSyntaxOn
\msg_redirect_name:nnn{siunitx}{physics-pkg}{none}
\ExplSyntaxOn

The last line should be \ExplSyntaxOff

\ExplSyntaxOn
\msg_redirect_name:nnn{siunitx}{physics-pkg}{none}
\ExplSyntaxOff

Thanks for this one. I can finally use \qty from physics package. This package is hardwired in my project. I also needed the siunitx package for the units where I can luckily still use the \SI command.