feat(emacs): default editor

modules/home/emacs.nix

@@ -4,6 +4,13 @@ let cfg = config.sydnix.emacs;
 in {
   options.sydnix.emacs = {
     enable = lib.mkEnableOption "Emacs";
+    defaultEditor = lib.mkOption {
+      description = ''
+        Set as default editor?
+      '';
+      default = false;
+      type = lib.types.bool;
+    };
     userDir = lib.mkOption {
       description = ''
         The path to the Emacs user directory.
@@ -121,6 +128,13 @@ in {
           version = cfg.package.version;
         };
     in {
+      
+      # Set emacsclient as the default editor for the time being.
+      home.sessionVariables = {
+        EDITOR = "emacsclient";
+        VISUAL = "emacsclient";
+      };
+
       programs.emacs = {
         enable = true;
         package = sydmacs;