GNU bug report logs - #15284
wish: make the (name) field optional

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From: Ricardo Wurmus <rekado@HIDDEN>
To: 15284-done <at> debbugs.gnu.org
Subject: wish: make the (name) field optional
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I agree with Ludo and Andreas that we better shouldn=E2=80=99t make the
name field optional.

That said, I just pushed a series of patches that happens to address
this wishlist item in a very roundabout way.  It is now possible to
build packages from JSON files like this:

--8<---------------cut here---------------start------------->8---
[
  {
    "name": "myhello",
    "version": "2.10",
    "source": "mirror://gnu/hello/hello-2.10.tar.gz",
    "build-system": "gnu",
    "arguments": {
      "tests?": false
    }
    "home-page": "https://www.gnu.org/software/hello/",
    "synopsis": "Hello, GNU world: An example GNU package",
    "description": "GNU Hello prints a greeting.",
    "license": "GPL-3.0+",
    "native-inputs": ["gettext"]
  },
  {
    "name": "greeter",
    "version": "1.0",
    "source": "https://example.com/greeter-1.0.tar.gz",
    "build-system": "gnu",
    "arguments": {
      "test-target": "foo",
      "parallel-build?": false,
    },
    "home-page": "https://example.com/",
    "synopsis": "Greeter using GNU Hello",
    "description": "This is a wrapper around GNU Hello.",
    "license": "GPL-3.0+",
    "inputs": ["myhello", "hello"]
  }
]
--8<---------------cut here---------------end--------------->8---

As you can see, there is no variable assignment, because this is JSON.
The =E2=80=9Cname=E2=80=9D field is the only identifier, and its value can =
be used as an
input in other packages (see the reference to =E2=80=9Cmyhello=E2=80=9D in =
the =E2=80=9Cgreeter=E2=80=9D
package definition).

It=E2=80=99s really only tangentially related to what this issue is about, =
but
it=E2=80=99s as close as we can get to duplication-free syntax =E2=80=94 ev=
en though
it=E2=80=99s JSON and not Scheme.  Look, there are also no labels for input=
s!
Because there are no custom phases either=E2=80=A6

--
Ricardo

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From: Arne Babenhauserheide <arne_bab@HIDDEN>
To: Ludovic =?ISO-8859-1?Q?Court=E8s?= <ludo@HIDDEN>
Subject: Re: bug#15284: wish: make the (name) field optional
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Am Freitag, 6. September 2013, 14:06:49 schrieb Ludovic Court=C3=A8s:
> However, I prefer treating packages just like any other Scheme object=
,
> and to avoid introducing =E2=80=9Cmagic=E2=80=9D with macros like thi=
s.

I prefer not having to repeat stuff, and being able to do stuff like th=
is is one of the big advantages of scheme.

But to see whether it actually helps a lot, it would be necessary to kn=
ow how many packages will be available in multiple versions (so the pac=
kage name and the variable have to differ).

Best wishes,
Arne
--=20
Ein Mann wird auf der Stra=C3=9Fe mit einem Messer bedroht.=20
Zwei Polizisten sind sofort da und halten ein Transparent davor.=20

=09"Illegale Szene. Niemand darf das sehen."

Der Mann wird ausgeraubt, erstochen und verblutet,=20
denn die Polizisten haben beide H=C3=A4nde voll zu tun.=20

Willkommen in Deutschland. Zensur ist sch=C3=B6n.=20
      ( http://draketo.de/stichwort/zensur )


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From: Andreas Enge <andreas@HIDDEN>
To: Ludovic =?iso-8859-15?Q?Court=E8s?= <ludo@HIDDEN>
Subject: Re: bug#15284: wish: make the (name) field optional
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On Fri, Sep 06, 2013 at 02:06:49PM +0200, Ludovic Courtès wrote:
> As discussed on IRC, the main issue is that package objects exist
> whether or not the exist a variable bound to them; and really there can
> be any number of variables whose value is a given package object.  IOW,
> there is no direct connection between the variable name and the package
> name.

This is what happens with the python package rewriting I just implemented:
Inputs are rewritten as packages inside a list, and are not associated
to a variable name.

Having a special syntax just for avoiding to write the package name a second
time is not really needed in my opinion.

Andreas

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From: ludo@HIDDEN (Ludovic =?utf-8?Q?Court=C3=A8s?=)
To: Arne Babenhauserheide <arne_bab@HIDDEN>
Subject: Re: bug#15284: wish: make the (name) field optional
References: <8761ueqq09.wl%arne_bab@HIDDEN>
Date: Fri, 06 Sep 2013 14:06:49 +0200
In-Reply-To: <8761ueqq09.wl%arne_bab@HIDDEN> (Arne Babenhauserheide's message
 of "Fri, 06 Sep 2013 11:05:26 +0200")
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Arne Babenhauserheide <arne_bab@HIDDEN> skribis:

> Currently when defining a package, I have to write the name at least
> twice:
>
> (define-public NAME
>   (name "NAME"))
>
> This gives the flexibility to use different names for the visual
> output and the technical name. But for most packages it likely just
> adds useless duplication.
>
> So I think the (name) field should be optional, and if it is not
> present, the packages technical name should be used automatically.

As discussed on IRC, the main issue is that package objects exist
whether or not the exist a variable bound to them; and really there can
be any number of variables whose value is a given package object.  IOW,
there is no direct connection between the variable name and the package
name.

That said, for cases like the above, we could have:

  (define-syntax-rule (define-package package-name fields ...)
    (define-public package-name
      (package
        (name (symbol->string 'package-name))
        fields ...)))

However, I prefer treating packages just like any other Scheme object,
and to avoid introducing =E2=80=9Cmagic=E2=80=9D with macros like this.

WDYT?

Ludo=E2=80=99.

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Date: Fri, 06 Sep 2013 11:05:26 +0200
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From: Arne Babenhauserheide <arne_bab@HIDDEN>
To: bug-guix@HIDDEN
Subject: wish: make the (name) field optional
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Hi Guix Hackers,

Currently when defining a package, I have to write the name at least
twice:

(define-public NAME
  (name "NAME"))

This gives the flexibility to use different names for the visual
output and the technical name. But for most packages it likely just
adds useless duplication.

So I think the (name) field should be optional, and if it is not
present, the packages technical name should be used automatically.

Best wishes,
Arne