upd

custom/unlisted-fonts.nix

@@ -0,0 +1,33 @@
+{
+  description = "A flake that gives access to custom fonts.";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        defaultPackage = pkgs.symlinkJoin {
+          name = "myfonts-0.1";
+          paths = builtins.attrValues self.packages.${system};
+        };
+
+        packages.monolisa = pkgs.stdenvNoCC.mkDerivation {
+          name = "monolisa-font";
+          dontConfigure = true;
+          src = builtins.toPath ./fonts;
+        };
+        installPhase = ''
+          mkdir -p $out/share/fonts/truetype
+          cp -R $src/moonolisa/*.ttf $out/share/fonts/truetype
+        '';
+        meta = {description = "Monolisa font.";};
+      }
+    );
+}

system/font.nix

@@ -1,4 +1,10 @@
-{pkgs, ...}: {
+{
+  pkgs,
+  inputs,
+  system,
+  ...
+}: {
+
   fonts.packages = with pkgs; [
     nerd-fonts.fira-code
     nerd-fonts.jetbrains-mono