Modules: Add fonts module

system/modules/fonts/default.nix

@@ -0,0 +1,55 @@
+{
+  config,
+  lib,
+  mylib,
+  pkgs,
+  ...
+}: let
+  inherit (config.modules) fonts;
+in {
+  options.modules.fonts = import ./options.nix {inherit lib mylib;};
+
+  config = lib.mkIf fonts.enable {
+    fonts = {
+      # Some default fonts for unicode coverage
+      enableDefaultPackages = true;
+
+      # Puts fonts to /run/current-system/sw/share/X11/fonts
+      # https://wiki.nixos.org/wiki/Fonts#Flatpak_applications_can.27t_find_system_fonts
+      fontDir.enable = true;
+
+      # Font packages go here.
+      # They are installed system-wide so they land in fontdir,
+      # this is required for flatpak to find them.
+      packages = with pkgs; [
+        # Monospace fonts
+        nerd-fonts.jetbrains-mono
+        nerd-fonts.victor-mono
+        monolisa
+
+        # Sans/Serif fonts
+        noto-fonts
+        noto-fonts-emoji
+        noto-fonts-cjk-sans
+        lxgw-wenkai
+      ];
+
+      fontconfig = {
+        enable = true;
+        antialias = true;
+        hinting.enable = true;
+        hinting.autohint = true;
+        cache32Bit = true;
+
+        # https://wiki.nixos.org/wiki/Fonts#Noto_Color_Emoji_doesn.27t_render_on_Firefox
+        useEmbeddedBitmaps = true;
+
+        defaultFonts = {
+          serif = [fonts.defaultSerifFont] ++ fonts.fallbackSerifFonts;
+          sansSerif = [fonts.defaultSansSerifFont] ++ fonts.fallbackSansSerifFonts;
+          monospace = [fonts.defaultMonoFont] ++ fonts.fallbackMonoFonts;
+        };
+      };
+    };
+  };
+}

system/modules/fonts/options.nix

@@ -0,0 +1,69 @@
+{
+  lib,
+  mylib,
+  ...
+}: {
+  enable = lib.mkEnableOption "Enable fonts configuration";
+
+  defaultSerifFont = lib.mkOption {
+    type = lib.types.str;
+    description = "Select default serif font";
+    example = ''
+      "Noto Serif CJK SC"
+    '';
+    default = "Noto Serif CJK SC";
+  };
+
+  defaultSansSerifFont = lib.mkOption {
+    type = lib.types.str;
+    description = "Select default sans-serif font";
+    example = ''
+      "Noto Sans CJK SC"
+    '';
+    default = "Noto Sans CJK SC";
+  };
+
+  defaultMonoFont = lib.mkOption {
+    type = lib.types.str;
+    description = "Select default monospace font";
+    example = ''
+      "MonoLisa Alt Script"
+    '';
+    default = "MonoLisa Alt Script";
+  };
+
+  fallbackSerifFonts = lib.mkOption {
+    type = lib.types.listOf lib.types.str;
+    description = "Select fallback serif fonts";
+    example = ''
+      [
+        "Noto Serif CJK SC"
+      ]
+    '';
+    default = [];
+  };
+
+  fallbackSansSerifFonts = lib.mkOption {
+    type = lib.types.listOf lib.types.str;
+    description = "Select fallback sans-serif fonts";
+    example = ''
+      [
+        "Noto Sans CJK SC"
+      ]
+    '';
+    default = [];
+  };
+
+  fallbackMonoFonts = lib.mkOption {
+    type = lib.types.listOf lib.types.str;
+    description = "Select fallback monospace fonts";
+    example = ''
+      [
+        "JetBrainsMono Nerd Font Mono"
+      ]
+    '';
+    default = [
+      "JetBrainsMono Nerd Font Mono"
+    ];
+  };
+}