[Nix-dev] Function to look up symbols dynamically?

[Bryan Ferris]

Well, it seems I still have a lot to learn about Nix. Thanks for the advice
and references!

On Wed, Mar 15, 2017 at 3:56 PM, Nicolas Pierron <nicolas.b.pierron at nbp.name
> wrote:

> Hi Bryan,
>
> On Wed, Mar 15, 2017 at 5:21 PM, Bryan Ferris <primummoven at gmail.com>
> wrote:
> > I believe that for complicated configurations this would lead to a tidier
> > config.
>
> I honestly don't think this would help you keep your configuration
> isolated by concerns as the module system of NixOS does.
>
> > My goal is to be able to add one line to configuration.nix which
> > will import everything from the directory, meaning that you can put as
> much
> > or as little as you want into the main configuration file and you can
> move
> > code around easily in order to find the system of organization that fits
> > your specific use-case the best.
>
> Modules have an `imports` top-level attribute which can be used to
> list other files that have to be included in the configuration.
>
> > This seems like a reasonable approach to a
> > useful tool, no?
>
> If you really want to continue that way, I suggest you to look at the
> builtin function `builtins.readDir`.
> Otherwise, if what you are looking for a better way to lookup options,
> maybe you should look at `nixos-option` tool, which should help you
> better understand where options are defined both within NixOS, and
> within your own modules:
>
> $ nixos-option environment.systemPackages
> Declared by:
>   "/nix/var/nix/profiles/per-user/root/channels/nixos/
> nixpkgs/nixos/modules/config/system-path.nix"
>
> Defined by:
>   "/nix/var/nix/profiles/per-user/root/channels/nixos/
> nixpkgs/nixos/modules/services/x11/desktop-managers/kde4.nix"
>   "/nix/var/nix/profiles/per-user/root/channels/nixos/
> nixpkgs/nixos/modules/services/x11/desktop-managers/xterm.nix"
>   "/nix/var/nix/profiles/per-user/root/channels/nixos/
> nixpkgs/nixos/modules/virtualisation/virtualbox-guest.nix"
>   "/nix/var/nix/profiles/per-user/root/channels/nixos/
> nixpkgs/nixos/modules/virtualisation/containers.nix"
>   "/nix/var/nix/profiles/per-user/root/channels/nixos/
> nixpkgs/nixos/modules/tasks/swraid.nix"
>   ...
>
> If you are looking for reading more about it, I will recommend the 2
> following chapters of the NixOS manual:
> http://nixos.org/nixos/manual/index.html#sec-configuration-syntax
> http://nixos.org/nixos/manual/index.html#sec-writing-modules
>
> --
> Nicolas Pierron
> http://www.linkedin.com/in/nicolasbpierron - http://nbp.name/
>
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