lib: create 'my' extensions

Inspired by this [1] repo, I want to add some functions to `lib.my`. I
would have liked to make it work without having to use an overlay, but I
did not manage to do it...

[1]: https://github.com/hlissner/dotfiles
This commit is contained in:
Bruno BELANYI 2021-03-10 18:49:12 +00:00
parent 11b25a0e0e
commit 331b7cf8e3
4 changed files with 63 additions and 3 deletions

View file

@ -8,11 +8,14 @@
futils.url = "github:numtide/flake-utils";
};
outputs = { self, nixpkgs, nur, home-manager, futils }:
outputs = { self, nixpkgs, nur, home-manager, futils } @ inputs:
let
inherit (nixpkgs) lib;
inherit (futils.lib) eachDefaultSystem;
lib = nixpkgs.lib.extend (self: super: {
my = import ./lib { inherit inputs; pkgs = nixpkgs; lib = self; };
});
defaultModules = [
({ ... }: {
# Let 'nixos-version --json' know about the Git revision
@ -21,7 +24,7 @@
then self.rev
else throw "Refusing to build from a dirty Git tree!";
})
{ nixpkgs.overlays = [ nur.overlay ]; }
{ nixpkgs.overlays = [ nur.overlay self.overlay ]; }
home-manager.nixosModules.home-manager
{
home-manager.users.ambroisie = import ./home;
@ -52,6 +55,12 @@
];
};
}) // {
overlay = self.overlays.lib;
overlays = {
lib = final: prev: { inherit lib; };
};
nixosConfigurations = lib.mapAttrs buildHost {
porthos = "x86_64-linux";
};

7
lib/attrs.nix Normal file
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@ -0,0 +1,7 @@
{ lib, ... }:
let
inherit (lib) filterAttrs mapAttrs';
in
{
mapFilterAttrs = pred: f: attrs: filterAttrs pred (mapAttrs' f attrs);
}

21
lib/default.nix Normal file
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@ -0,0 +1,21 @@
# Extension mechanism shamelessly stolen from [1].
#
# [1]: https://github.com/hlissner/dotfiles/blob/master/lib/default.nix
{ lib, pkgs, inputs }:
let
inherit (lib) makeExtensible attrValues foldr;
inherit (modules) mapModules;
modules = import ./modules.nix {
inherit lib;
self.attrs = import ./attrs.nix { inherit lib; self = { }; };
};
mylib = makeExtensible (self:
with self; mapModules ./.
(file: import file { inherit self lib pkgs inputs; })
);
in
mylib.extend (self: super:
foldr (a: b: a // b) { } (attrValues super)
)

23
lib/modules.nix Normal file
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@ -0,0 +1,23 @@
{ self, lib, ... }:
let
inherit (builtins) readDir pathExists;
inherit (lib) hasPrefix hasSuffix nameValuePair removeSuffix;
inherit (self.attrs) mapFilterAttrs;
in
{
mapModules = dir: fn:
mapFilterAttrs
(n: v:
v != null &&
!(hasPrefix "_" n))
(n: v:
let path = "${toString dir}/${n}"; in
if v == "directory" && pathExists "${path}/default.nix"
then nameValuePair n (fn path)
else if v == "regular" &&
n != "default.nix" &&
hasSuffix ".nix" n
then nameValuePair (removeSuffix ".nix" n) (fn path)
else nameValuePair "" null)
(readDir dir);
}