feat: configure karabiner declaratively

modules/darwin/karabiner.nix

@@ -0,0 +1,165 @@
+{ lib, ... }: let
+  # inherit (lib) enabled;
+  inherit (lib.strings) toJSON;
+
+  allBasic = map (x: x // { type = "basic"; });
+
+  simple_modifications = [
+    {
+      from.key_code = "caps_lock";
+
+      to = [{ key_code = "escape"; }];
+    }
+
+    {
+      from.key_code = "escape";
+
+      to = [{ key_code = "caps_lock"; }];
+    }
+  ];
+
+  complex_modifications.rules = [
+    {
+      description  = "Replace alt+spacebar with spacebar";
+      manipulators = allBasic [
+        {
+          from.key_code            = "spacebar";
+          from.modifiers.mandatory = [ "left_option" ];
+          from.modifiers.optional  = [ "left_shift" "right_shift" ];
+
+          to = [{ key_code = "spacebar"; }];
+        }
+        {
+          from.key_code            = "spacebar";
+          from.modifiers.mandatory = [ "right_option" ];
+          from.modifiers.optional  = [ "left_shift" "right_shift" ];
+
+          to = [{ key_code = "spacebar"; }];
+        }
+      ];
+    }
+
+    {
+      description  = "Swap ĞğüÜ and {[]}";
+      manipulators = allBasic [
+        {
+          from.key_code = "open_bracket";
+
+          to = [{
+            key_code  = "8";
+            modifiers = [ "right_option" ];
+          }];
+        }
+        {
+          from.key_code            = "open_bracket";
+          from.modifiers.mandatory = ["shift"];
+
+          to = [{
+            key_code  = "7";
+            modifiers = [ "right_option" ];
+          }];
+        }
+        {
+          from.key_code = "close_bracket";
+
+          to = [{
+            key_code  = "9";
+            modifiers = [ "right_option" ];
+          }];
+        }
+        {
+          from.key_code            = "close_bracket";
+          from.modifiers.mandatory = [ "shift" ];
+
+          to = [{
+            key_code  = "0";
+            modifiers = [ "right_option" ];
+          }];
+        }
+        {
+          from.key_code            = "8";
+          from.modifiers.mandatory = [ "option" ];
+
+          to = [{ key_code = "open_bracket"; }];
+        }
+        {
+          from.key_code            = "7";
+          from.modifiers.mandatory = [ "option" ];
+
+          to = [{
+            key_code  = "open_bracket";
+            modifiers = [ "shift" ];
+          }];
+        }
+        {
+          from.key_code            = "9";
+          from.modifiers.mandatory = [ "option" ];
+
+          to = [{ key_code = "close_bracket"; }];
+        }
+        {
+          from.key_code            = "0";
+          from.modifiers.mandatory = [ "option" ];
+
+          to = [{
+            key_code  = "close_bracket";
+            modifiers = [ "shift" ];
+          }];
+        }
+      ];
+    }
+
+    {
+      description = "Swap ı and i";
+      manipulators = allBasic [
+        {
+          from.key_code = "quote";
+        
+          to = [{ key_code = "i"; }];
+        }
+        {
+          from.key_code = "i";
+        
+          to = [{ key_code = "quote"; }];
+        }
+      ];
+    }
+  ];
+in {
+  # TODO: Install using Nix. Currently I'm doing it manually.
+
+  # nixpkgs.overlays = [(self: super: {
+  #   karabiner-elements = super.karabiner-elements.overrideAttrs (old: {
+  #     version = "14.13.0";
+
+  #     src = super.fetchurl {
+  #       inherit (old.src) url;
+
+  #       hash = "sha256-gmJwoht/Tfm5qMecmq1N6PSAIfWOqsvuHU8VDJY8bLw=";
+  #     };
+  #   });
+  # })];
+
+  # services.karabiner-elements = enabled;
+
+  home-manager.sharedModules = [{
+    xdg.configFile."karabiner/karabiner.json".text = toJSON {
+      global.show_in_menu_bar = false;
+
+      profiles = [{
+        inherit complex_modifications;
+
+        name     = "Default";
+        selected = true;
+
+        virtual_hid_keyboard.keyboard_type_v2 = "ansi";
+
+        devices = [{
+          inherit simple_modifications;
+
+          identifiers.is_keyboard = true;
+        }];
+      }];
+    };
+  }];
+}