feat: import and configure smartcolumn

modules/ui/smartcolumn/smartcolumn.nix

@@ -0,0 +1,41 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib;
+with builtins; let
+  languageOpts = {
+    columnAt = mkOption {
+      type = types.nullOr types.int;
+      default = 80;
+    };
+  };
+in {
+  options.vim.ui.smartcolumn = {
+    enable = mkEnableOption "Enable smartcolumn line length indicator";
+
+    showColumnAt = mkOption {
+      type = types.nullOr types.int;
+      default = 120;
+      description = "The position at which the column will be displayed. Set to null to disable";
+    };
+
+    disabledFiletypes = mkOption {
+      type = types.listOf types.str;
+      default = ["help" "text" "markdown" "NvimTree" "alpha"];
+      description = "The filetypes smartcolumn will be disabled for.";
+    };
+
+    /*
+    languages = mkOption {
+      default = {};
+      description = "Language specific configuration.";
+      type = with types;
+        attrsOf (submodule {
+          options = attrsOf (submodule langOptions);
+        });
+    };
+    */
+  };
+}