Re: emacs.scm: Suggest add emacs-next or emacs-snapshot

[ludo@gnu.org (Ludovic Courtès)]

"Feng Shu" <tumashu@163.com> skribis:

> ludo@gnu.org (Ludovic Courtès) writes:
>
>> tumashu <tumashu@163.com> skribis:
>>
>>> Suggest add emacs-next or emacs-snapshot and let guile-emacs inherit it, The reason is that
>>> user can use it build emacs from emacs.git conveniently， for example:
>>>
>>>     guix build emacs-snapshot --with-source=./emacs-snapshot-20151111.tar.gz
>>
>> To use --with-source, all you need to do is to rename the tarball to
>> ‘emacs-20151111.tar.gz’; after that, you can run:
>>
>>   guix build emacs --with-source=emacs-20151111.tar.gz
>>
>> That’s because --with-source expects the tarball name to match the
>> package name (info "(guix) Invoking guix build").
>
> I don't think it is a flexible way, i like the below:
>
>     guix build emacs --with-source=~/my-own-emacs-dir --override-name=emacs --override-version=20151111

I agree that’s more flexible but that’s also less nice as a UI.

And it’s not as simple as this.  Currently one can do:

  guix build emacs guile \
    --with-source=emacs-2123123.tar.gz --with-source=guile-12321.tar.gz

and it does the right thing.

Here we wouldn’t know what package --override-name and
--override-version apply to.

For non-trivial use cases, I would suggest writing a file like this:

  (use-modules (guix) (gnu packages emacs))

  (package
    (inherit emacs)
    (name "emacs-snapshot")
    (source "/path/to/some-file-or-directory.tar.gz"))

and then run:

  guix package --install-from-file=that-file.scm

WDYT?

Ludo’.