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From: Josselin Poiret <dev@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#68413: Ungexp doesn't work on deep lists
In-Reply-To: <87le8rj5dp.fsf@HIDDEN>
References: <87v87yvw2y.fsf@HIDDEN> <87ttnhh39d.fsf@HIDDEN>
<87le8rj5dp.fsf@HIDDEN>
Date: Mon, 15 Jan 2024 17:28:47 +0100
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--=-=-=
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Hi Ludo,
Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
> Actually, what bug are we talking about? It seems to work for me with
> this example:
>
> --8<---------------cut here---------------start------------->8---
> scheme@(guile-user)> (define packages `(("coreutils" ,coreutils) ("make" =
,gnu-make)))
> scheme@(guile-user)> ,build (scheme-file "foo" #~(begin '#$packages))
> building /gnu/store/lq9gvbilv0y2nph00zxk6bn3lvcgdxqq-foo.drv...
> $7 =3D "/gnu/store/9ryh6v80jvjv3kwx0q782h26h9gbaclj-foo"
> scheme@(guile-user)> (call-with-input-file $7 get-string-all)
> $8 =3D "(begin (quote ((\"coreutils\" \"/gnu/store/mppp9hwxizx9g9pikwcvvs=
hb2ffxyq7p-coreutils-9.1\") (\"make\" \"/gnu/store/9fadhs5qmwl5x7f669a0v39b=
3ryrmmf1-make-4.3\"))))"
> --8<---------------cut here---------------end--------------->8---
>
> One of the design decisions for gexps was to ensure that substituting a
> file-like object by its file name would be O(1) in most cases.
>
> Substitution in lists as in the example above is supported, but
> primarily for backward compatibility. It should be avoided when
> possible because it=E2=80=99s inefficient: =E2=80=98gexp->sexp=E2=80=99 n=
eeds to traverse the
> whole list/tree in search of potential candidates.
Notice that OP's example uses `(("thing" . ,package)), ie. lists of
pairs and not lists of lists, as in your case!
Best,
=2D-=20
Josselin Poiret
--=-=-=
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--=-=-=--
bug-guix@HIDDEN:bug#68413; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Josselin Poiret <dev@HIDDEN>
Subject: Re: bug#68413: Ungexp doesn't work on deep lists
In-Reply-To: <87ttnhh39d.fsf@HIDDEN> (Josselin Poiret's message of "Sat,
13 Jan 2024 12:38:38 +0100")
References: <87v87yvw2y.fsf@HIDDEN> <87ttnhh39d.fsf@HIDDEN>
Date: Mon, 15 Jan 2024 10:46:42 +0100
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Hi,
Josselin Poiret <dev@HIDDEN> skribis:
> Justin Veilleux <terramorpha@HIDDEN> writes:
>
>>> (define packages
>>> (list
>>> (cons "coreutils" coreutils)
>>> (cons "make" gnu-make)
>>> ...))
>>>
>>> #~(for-each
>>> (lambda (f)
>>> ... do-something)
>>> '#$packages)
>>
>> If I send a patch to "fix" this, will it be usefull or is there a reason
>> for this behavior?
>
> I think IMO that it's a bug, but it's also quite tricky to properly
> traverse deep structures like this. The bug comes from the fact that in
> gexp->sexp, we traverse lists by matching the reference with (refs ...),
> but that doesn't match if the reference is a pair instead. Then, it
> tries to match with ($ <gexp-input> (? self-quoting? x)), which does
> match since self-quoting? apparently returns #t on a pair, whether or
> not its constituents are also self-quoting.
Actually, what bug are we talking about? It seems to work for me with
this example:
--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> (define packages `(("coreutils" ,coreutils) ("make" ,g=
nu-make)))
scheme@(guile-user)> ,build (scheme-file "foo" #~(begin '#$packages))
building /gnu/store/lq9gvbilv0y2nph00zxk6bn3lvcgdxqq-foo.drv...
$7 =3D "/gnu/store/9ryh6v80jvjv3kwx0q782h26h9gbaclj-foo"
scheme@(guile-user)> (call-with-input-file $7 get-string-all)
$8 =3D "(begin (quote ((\"coreutils\" \"/gnu/store/mppp9hwxizx9g9pikwcvvshb=
2ffxyq7p-coreutils-9.1\") (\"make\" \"/gnu/store/9fadhs5qmwl5x7f669a0v39b3r=
yrmmf1-make-4.3\"))))"
--8<---------------cut here---------------end--------------->8---
One of the design decisions for gexps was to ensure that substituting a
file-like object by its file name would be O(1) in most cases.
Substitution in lists as in the example above is supported, but
primarily for backward compatibility. It should be avoided when
possible because it=E2=80=99s inefficient: =E2=80=98gexp->sexp=E2=80=99 nee=
ds to traverse the
whole list/tree in search of potential candidates.
Thanks,
Ludo=E2=80=99.
bug-guix@HIDDEN:bug#68413; Package guix.
Full text available.Received: (at 68413) by debbugs.gnu.org; 13 Jan 2024 11:38:46 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Jan 13 06:38:46 2024 Received: from localhost ([127.0.0.1]:38622 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1rOcLd-0007vO-Od for submit <at> debbugs.gnu.org; Sat, 13 Jan 2024 06:38:46 -0500 Received: from jpoiret.xyz ([206.189.101.64]:46770) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <dev@HIDDEN>) id 1rOcLa-0007v9-Jn for 68413 <at> debbugs.gnu.org; Sat, 13 Jan 2024 06:38:45 -0500 Received: from authenticated-user (jpoiret.xyz [206.189.101.64]) by jpoiret.xyz (Postfix) with ESMTPA id 0D5EC185453; Sat, 13 Jan 2024 11:38:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jpoiret.xyz; s=dkim; t=1705145922; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=K9s/jyjB4z9V4GRmjoSjuQb1h/Am6TuZzhXu+29bxTk=; b=Q74aX3CndtHQFkTQsBW8mNduF+nUy7HUNBsuwUWMs1VQiYrjrPZWChH8Th8vU704dlQrBi BTj+s+bULTH2DQxInVD2chYdn+xQcbtfZ6i5mIWAUXaCrs5DEF/ac4ONy5VmJqoZPADGds bI8tUZcDPtvSKnZLXW/2KE5zxDG7lQjAd63kSwIA09EMN4lI8EC0F9R2btwk503Bb0BYrY KeK1YvvpTRonnKFEWhIVuWDLQaJggs70tFleRumWmikhPNHlcbMOCPqahjxzah6BScXg8A EQTvcBw5la1+PuR+YzZ6ss5YaLU6ACixvfTLjDfwqawexFTv96BxaAbsFaW9hg== From: Josselin Poiret <dev@HIDDEN> To: Justin Veilleux <terramorpha@HIDDEN>, 68413 <at> debbugs.gnu.org Subject: Re: bug#68413: Ungexp doesn't work on deep lists In-Reply-To: <87v87yvw2y.fsf@HIDDEN> References: <87v87yvw2y.fsf@HIDDEN> Date: Sat, 13 Jan 2024 12:38:38 +0100 Message-ID: <87ttnhh39d.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" X-Spamd-Bar: / Authentication-Results: jpoiret.xyz; auth=pass smtp.auth=jpoiret@HIDDEN smtp.mailfrom=dev@HIDDEN X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 68413 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Hi Justin, Justin Veilleux <terramorpha@HIDDEN> writes: >> (define packages >> (list >> (cons "coreutils" coreutils) >> (cons "make" gnu-make) >> ...)) >> >> #~(for-each >> (lambda (f) >> ... do-something) >> '#$packages) > > If I send a patch to "fix" this, will it be usefull or is there a reason > for this behavior? I think IMO that it's a bug, but it's also quite tricky to properly traverse deep structures like this. The bug comes from the fact that in gexp->sexp, we traverse lists by matching the reference with (refs ...), but that doesn't match if the reference is a pair instead. Then, it tries to match with ($ <gexp-input> (? self-quoting? x)), which does match since self-quoting? apparently returns #t on a pair, whether or not its constituents are also self-quoting. Best, =2D-=20 Josselin Poiret --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQHEBAEBCAAuFiEEOSSM2EHGPMM23K8vUF5AuRYXGooFAmWidj4QHGRldkBqcG9p cmV0Lnh5egAKCRBQXkC5Fhcaij9YDACaNDfeMZsVBnnXyeSYtPhNu3VfkcN1UGZk sr3n9lFm8dnSJ5buUVNo5vXm34xgwuG+QrNe682Hmd8oj/Hn/oSTCcFn9+jkFpn4 QX7N30P+Rn9fXoB2tpj5B64pv6ITl3jL8Tkw5+l3EZKp4Mrl6QgfOrv8talCj3jv GDgPNuh+siek7S7u57HZNY5Re9gvhNvNE5XGMmCF47QQcfM76jnmojnxYDSw/aaK DexShbr/BWwkqSQn0VcinoJ+ASCy/tymqg2Vf/ooaMDDgGWEuz0N1C35qJRkp0GR DYXn+ffoaHmRqqJpuAfFwInIi4sFFC7OWWlgiRYfRXjniO7JB/wpUKi7xZ9ay3t5 +yK08wlnEAblRPnaS7x0fYhCUIJn5u5goBoGz86oghh05wNM+wuG4pf0WMqRlOww YF+XG0jrad6JrpC370epzDo/Z5qtJLwp5weDUqs8Q1J0wRyEokbYke+PGiqorLVs UnPVdmrIYdeTZApTb4olaUXFsJZjgLY= =PxKF -----END PGP SIGNATURE----- --=-=-=--
bug-guix@HIDDEN:bug#68413; Package guix.
Full text available.Received: (at submit) by debbugs.gnu.org; 13 Jan 2024 01:52:48 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Jan 12 20:52:48 2024 Received: from localhost ([127.0.0.1]:38029 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1rOTCa-0005yS-2t for submit <at> debbugs.gnu.org; Fri, 12 Jan 2024 20:52:48 -0500 Received: from lists.gnu.org ([2001:470:142::17]:51476) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <terramorpha@HIDDEN>) id 1rOTCW-0005yE-Jp for submit <at> debbugs.gnu.org; Fri, 12 Jan 2024 20:52:46 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <terramorpha@HIDDEN>) id 1rOTCS-0006G8-E3 for bug-guix@HIDDEN; Fri, 12 Jan 2024 20:52:40 -0500 Received: from mail.cock.li ([37.120.193.123]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <terramorpha@HIDDEN>) id 1rOTCP-0005gh-Vy for bug-guix@HIDDEN; Fri, 12 Jan 2024 20:52:40 -0500 From: Justin Veilleux <terramorpha@HIDDEN> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cock.li; s=mail; t=1705110743; bh=vKesA1XpE1Y1FaQb1b5HvJuqhaCqL9npY4Lw+31F+mc=; h=From:To:Subject:Date:From; b=cfcaLbiQn25n+Va+5KPG1sNHfPLeKtxePjHHS/yqvORVpQQvicHW4YU/z4B89OyV8 bk15jZSLLInbRjygA/h2o0y1XZC2BOyGOBFa/I2bQsOR4segKRAly2R/MiwbVVSbuU sD7/zFIRbaF6/A8t6AaTg1ImebNVWKCzdRvq7OZUyqZdMa7G0SFg6bWDpHXNPluNLj wNdz6KbuByGGfP7N8oONx8J2Y3RzDA2gLmErjNPK+4mrtmMvc2cZurWL+IttqfBShw MtGbKq1rrlJPzXbw3Gb6wTBIVNZiT47G+z3QtzwyVRNbN992n6jLmTDEQLTdpMP0MY AnJHb74BS9IsQ== To: bug-guix@HIDDEN Subject: Ungexp doesn't work on deep lists Date: Fri, 12 Jan 2024 20:52:21 -0500 Message-ID: <87v87yvw2y.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=37.120.193.123; envelope-from=terramorpha@HIDDEN; helo=mail.cock.li X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: 0.9 (/) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.1 (/) Hi, I've been using G-expressions for some time and have always been hindered by `ungexp` not working on deeper lists. For instance, when I want to embed in a G-expression a list of packages, it works >(define packages (list coreutils gnu-make ...)) > > #~(for-each > (lambda (f) > ... do-something) > '#$packages) But as soon as I use an object in which the file-like objects are deeper, it fails > (define packages > (list > (cons "coreutils" coreutils) > (cons "make" gnu-make) > ...)) > > #~(for-each > (lambda (f) > ... do-something) > '#$packages) If I send a patch to "fix" this, will it be usefull or is there a reason for this behavior? Thanks.
Justin Veilleux <terramorpha@HIDDEN>:bug-guix@HIDDEN.
Full text available.bug-guix@HIDDEN:bug#68413; Package guix.
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