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bug#49934: bug#50283: HwInfo

From: Maxim Cournoyer
Subject: bug#49934: bug#50283: HwInfo
Date: Thu, 23 Jun 2022 11:35:04 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.1 (gnu/linux)


Raghav Gururajan <> writes:

> Hi Ricardo!
>> --8<---------------cut here---------------start------------->8---
>> (substitute* ""
>>    (("Cmd\\(\"([^\"]+)" _ command)
>>     (string-append "Cmd(\"" (which command))))
>> --8<---------------cut here---------------end--------------->8---
> Thanks for the snippet and explanation.
> I am wondering these,
> [1] Does require import of specific modules?

No.  `which', the Scheme procedure, is part of (guix build utils).

> [2] If `(which command)`'s output is empty, will it return #f?

Yes, and I agree that's a problem.

Fortunately, the recently added search-input-file more usefully raises
an error when the file it is looking for doesn't exist, so I used that.

It was a bit painful to hunt all the commands but in the end it works
beautifully!  I pushed the result as

Closing, thanks!


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