system/fonts: init from legacy

modules/system/fonts/default.nix

@@ -0,0 +1,44 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.my.system.fonts;
+in
+{
+  options.my.system.fonts = with lib; {
+    enable = mkEnableOption "fonts configuration";
+
+    additionalFonts = mkOption {
+      type = types.listOf types.package;
+      default = [ ];
+      example = "fira";
+      description = "Which additional fonts should be added as well";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    fonts = {
+      fontconfig.defaultFonts = {
+        sansSerif = [ "Ubuntu" ];
+        monospace = [ "Ubuntu Mono" ];
+      };
+
+      fonts = with pkgs; [
+        cantarell-fonts # gnome default
+        fira
+        fira-code # coding
+        fira-code-symbols # ligatures
+        fira-mono
+        font-awesome # icons
+        joypixels # emojis
+        liberation_ttf # main microsoft fonts
+        # mplus-outline-fonts.githubRelease # microsoft fonts
+        noto-fonts
+        noto-fonts-cjk-sans
+        noto-fonts-emoji
+        noto-fonts-extra
+        ubuntu_font_family
+        unifont # unicode fallback
+      ] ++ cfg.additionalFonts;
+    };
+    nixpkgs.config.joypixels.acceptLicense = true;
+  };
+}