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Re: [PATCH 2/4] emacs: Add 'guix-devel-download-package-source'.

From: Ludovic Courtès
Subject: Re: [PATCH 2/4] emacs: Add 'guix-devel-download-package-source'.
Date: Thu, 08 Oct 2015 13:46:05 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Alex Kost <address@hidden> skribis:

> Ludovic Courtès (2015-10-08 01:10 +0300) wrote:
> [...]
>>>>> for example "" (an empty string).  Also I believe people begin to
>>>>> write a new package from some template, so you have a working skeleton
>>>>> of future package with all required fields from the very beginning.
>>>>> Then after filling an origin 'uri', you could "C-c . s" to download
>>>>> the source and get its hash.
>>>> Hmm.  I’m skeptical.  :-)
>>> Sorry, I didn't get it.  Skeptical that people start from a template?
>> Yes, it feels weird to me, the idea that an <origin> object with bogus
>> values would be created just for the sake of satisfying the download
>> tool.
> Hm, I have an opposite opinion: for me it is weird to write a package
> from scratch.  I usually start from a package template that has all
> required fields (including <origin>) or even I just copy an existing
> package and then modify the fields I need.
> I wonder, do you start to write a package from scratch?

Sometimes I write from scratch, sometimes I use ‘guix import’, sometimes
I copy/paste some other definition.

>> Wouldn’t the explanation in the manual of how to use this be relatively
>> complex?  That’s a good benchmark.
> As I see it, it is not complex:
> «Download a source of the package defined by the current variable
> definition and print its SHA256 hash.  This command has the same meaning
> as running @code{guix download} on the package source (@pxref{Invoking
> guix download})»

Hmm OK.  (Is it really “current variable definition”, or rather
“‘origin’ form at point”?)

> Anyway, after all I'm not going to add this command to not give people
> an incentive not to check signatures.

Yeah, maybe we can see where the other discussion goes.

The command to call ‘package-source-derivation’ for the package at point
is still welcome, though.  :-)

>>>> What about, instead, providing an interactive function that would prompt
>>>> for a URL, run ‘guix download’ on that, and emit an ‘origin’ template at
>>>> point with all the info?
>>> I see several problems here, but the main is: this sounds like it should
>>> be synchronous: you give an URL, wait until the source is downloaded and
>>> finally get the template at point.  But downloading can take a VERY long
>>> time, so I don't think it will be a usable command.
>> Good point.  But there’s the same problem with what you propose no?  The
>> user somehow has to wait for the download to complete?
> Well, sure you also need to wait for the download, but your Emacs won't
> be freezed for all this time, so you can do something else while it is
> being downloaded in the REPL.



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