[Nix-dev] A few questions from a NixOS newbie.

[Kirill Elagin]

If there was a way to

1. run nix-repl non-interactively,
2. list variables in scope

that would be a fine replacement for grepping and opening files…

Something like `nix-repl ':l <nixpkgs>; :scope' | grep foo` and `nix-repl
':l <nixpkgs>; :p foo.meta`.


--
Кирилл Елагин


On Mon, Apr 21, 2014 at 5:16 PM, Bjørn Forsman <bjorn.forsman at gmail.com>wrote:

> On 21 April 2014 14:56, Kirill Elagin <kirelagin at gmail.com> wrote:
> > On Mon, Apr 21, 2014 at 4:23 PM, Mateusz Kowalczyk <
> fuuzetsu at fuuzetsu.co.uk>
> > wrote:
> [...]
> >> * How can I find out more about packages? For example, I'd like to query
> >> a package of a license, or to see its .nix file. Someone told me on IRC
> >> how to do the second one but it involved grepping all-packages.nix,
> >> getting the path from there and then opening that. Is there no mechanism
> >> in place which can tell me more about a package? I'd expect at least the
> >> information given by the `eix' tool on Gentoo: installed and available
> >> versions, short description, homepage and license. It seems to me like
> >> fairly basic and useful information.
> >
> > Unfortunately, that's the way to go now. Grep `all-packages.nix`, find
> > expression path, and open it.
>
> There is also nix-repl. I guess it's not exactly what you're looking
> for, but it's useful to know about it:
>
> $ nix-repl
> Welcome to Nix version 1.7. Type :? for help.
>
> nix-repl> :l <nixpkgs>
> Added 3747 variables.
>
> nix-repl> :p wireshark.meta.license
> { fullName = "GNU General Public License version 2"; shortName =
> "GPLv2"; url = "http://www.gnu.org/licenses/old-licenses/gpl-2.0.html";
> }
>
> nix-repl> :p wireshark.meta
> { description = "a powerful network protocol analyzer"; homepage =
> "http://www.wireshark.org/"; license = { fullName = "GNU General
> Public License version 2"; shortName = "GPLv2"; url =
> "http://www.gnu.org/licenses/old-licenses/gpl-2.0.html"; };
> longDescription = "Wireshark (formerly known as \"Ethereal\") is a
> powerful network\nprotocol analyzer developed by an international team
> of networking\nexperts. It runs on UNIX, OS X and Windows.\n";
> maintainers = [ "Peter Simons <simons at cryp.to>" ]; platforms = [
> "i686-linux" "x86_64-linux" "armv5tel-linux" "armv7l-linux"
> "mips64el-linux" ]; position =
>
> "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/applications/networking/sniffers/wireshark/default.nix:47";
> }
>
>
> Best regards,
> Bjørn Forsman
>
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