refactor(emacs,hunspell): swap aspell for hunspell

modules/home/hunspell.nix

@@ -0,0 +1,29 @@
+{ config, lib, pkgs, ... }:
+
+let cfg = config.sydnix.hunspell;
+in {
+  options.sydnix.hunspell = {
+    enable = lib.mkEnableOption "Hunspell";
+    package = lib.mkPackageOption pkgs "hunspell" {};
+    dictionaries = lib.mkOption {
+      description = ''
+        Hunspell dictionary packages to install.
+      '';
+      default = _: [];
+      type = lib.types.anything // {
+        merge =
+          _loc: defs: dicts: lib.concatMap (f: f dicts) (lib.getValues defs);
+        check = lib.isFunction;
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.sessionVariables.DICPATH =
+      lib.makeSearchPath
+        "share/hunspell"
+        (cfg.dictionaries pkgs.hunspellDicts);
+
+    home.packages = [ cfg.package ];
+  };
+}