Don't install kanshi on non-graphical installs.

nix/configuration/roles/kanshi/default.nix

@@ -17,21 +17,40 @@ in
 {
   imports = [ ];
 
-  environment.systemPackages = with pkgs; [
+  options.me = {
-    kanshi
+    kanshi.enable = lib.mkOption {
-  ];
+      type = lib.types.bool;
-
+      default = false;
-  me.swayIncludes = [
+      example = true;
-    exec_kanshi
+      description = "Whether we want to install kanshi.";
-  ];
-
-  home-manager.users.talexander =
-    { pkgs, ... }:
-    {
-      home.file = {
-        ".config/kanshi/config" = {
-          source = ./files/config_kanshi;
-        };
-      };
     };
+  };
+
+  config = lib.mkIf config.me.kanshi.enable (
+    lib.mkMerge [
+      {
+        environment.systemPackages = with pkgs; [
+        ];
+      }
+      (lib.mkIf config.me.graphical {
+        environment.systemPackages = with pkgs; [
+          kanshi
+        ];
+
+        me.swayIncludes = [
+          exec_kanshi
+        ];
+
+        home-manager.users.talexander =
+          { pkgs, ... }:
+          {
+            home.file = {
+              ".config/kanshi/config" = {
+                source = ./files/config_kanshi;
+              };
+            };
+          };
+      })
+    ]
+  );
 }