Add custom Iosevka builds to fonts

system/default.nix

@@ -75,6 +75,15 @@
   };
   fonts = {
     packages = with pkgs; [
+      (nerdfonts.override {
+        fonts = [
+          "FantasqueSansMono" # My new main font
+          "Iosevka" # Keeping as a backup for now
+          "VictorMono" # Just for fun
+          "HeavyData" # Just for fun
+          "NerdFontsSymbolsOnly" # For other tools
+        ];
+      })
       emacs-all-the-icons-fonts
       weather-icons
     ];

system/stylix.nix

@@ -25,26 +25,94 @@
       package = pkgs.catppuccin-cursors.${variant};
       name = "Catppuccin-${catppuccinVariant}-Dark-Cursors";
     };
-    fonts = rec {
+    fonts = let
+      iosevkaCustomBuildPlan = {
+        noCvSs = false;
+        exportGlyphNames = false;
+        ligations.inherits = "dlig";
+        # variants.inherits = "ss05";
+        weights = {
+          Regular = {
+            shape = 400;
+            menu = 400;
+            css = 400;
+          };
+          Bold = {
+            shape = 700;
+            menu = 700;
+            css = 700;
+          };
+        };
+        variants.design = {
+          capital-q = "crossing-curly-tailed";
+          e = "rounded";
+          f = "tailed";
+          g = "double-storey-open";
+          i = "tailed";
+          k = "cursive-serifless";
+          l = "tailed-serifed";
+          t = "bent-hook-asymmetric";
+          v = "curly-serifless";
+          w = "curly-serifless";
+          x = "curly-serifless";
+          y = "straight-turn-serifless";
+          lower-lambda = "tailed-turn";
+          lower-xi = "flat-top";
+          lower-chi = "semi-chancery-curly";
+          zero = "tall-slashed";
+          three = "flat-top";
+          six = "straight-bar";
+          seven = "straight-serifless-crossbar";
+          eight = "crossing-asymmetric";
+          nine = "straight-bar";
+          ampersand = "upper-open";
+          at = "fourfold";
+          cent = "through";
+          percent = "rings-segmented-slash";
+          lig-ltgteq = "flat";
+        };
+      };
+    in {
       sizes = {
         applications = 16;
         desktop = 20;
         popups = 20;
         terminal = 16;
       };
-      serif = monospace;
-      sansSerif = monospace;
-      monospace = {
-        name = "FantasqueSansM Nerd Font";
-        package = pkgs.nerdfonts.override {
-          fonts = [
-            "FantasqueSansMono" # My new main font
-            "Iosevka" # Keeping as a backup for now
-            "GeistMono" # Still undecided about this one
-            "VictorMono" # Just for fun
-            "HeavyData" # Just for fun
-            "NerdFontsSymbolsOnly" # For other tools
-          ];
+      serif = rec {
+        name = "Iosevka Custom Etoile";
+        package = pkgs.iosevka.override {
+          set = "etoile";
+          privateBuildPlan = {
+            inherit (iosevkaCustomBuildPlan) noCvSs exportGlyphNames variants weights;
+            family = name;
+            spacing = "quasi-proportional";
+            serifs = "slab";
+          };
+        };
+      };
+      sansSerif = rec {
+        name = "Iosevka Custom Aile";
+        package = pkgs.iosevka.override {
+          set = "aile";
+          privateBuildPlan = {
+            inherit (iosevkaCustomBuildPlan) noCvSs exportGlyphNames variants weights;
+            family = name;
+            spacing = "quasi-proportional";
+            serifs = "sans";
+          };
+        };
+      };
+      monospace = rec {
+        name = "Iosevka Custom";
+        package = pkgs.iosevka.override {
+          set = "custom";
+          privateBuildPlan = {
+            inherit (iosevkaCustomBuildPlan) noCvSs exportGlyphNames variants weights;
+            family = name;
+            spacing = "normal";
+            serifs = "sans";
+          };
         };
       };
       emoji = {