Define keyBind interface in submodule.

modules/nvim-lazy/default.nix

@@ -2,7 +2,34 @@
 let
   mkOption = lib.mkOption;
   types = lib.types;
-  plugin = types.submodule (
+  keyBind = (
+    { ... }:
+    {
+      options = {
+        bind = mkOption {
+          type = types.str;
+          default = "";
+          description = ''The keys to bind.'';
+        };
+        cmd = mkOption {
+          type = with types; nullOr str;
+          default = null;
+          description = ''The command to execute. If this is a lua function set cmdIsFunction to true.'';
+        };
+        cmdIsFunction = mkOption {
+          type = types.bool;
+          default = false;
+          description = ''Needs to be set to true if cmd is a lua function.'';
+        };
+        opts = mkOption {
+          type = with types; nullOr attrs;
+          default = null;
+          description = ''Additional named parameters passed to the keybind function.'';
+        };
+      };
+    }
+  );
+  plugin = (
     { ... }:
     {
       options = {
@@ -150,7 +177,7 @@ let
         };
         keys = mkOption {
           # TODO: update;
-          type = with types; nullOr (listOf attrs);
+          type = with types; nullOr (listOf (submodule keyBind));
           default = null;
           description = ''Lazy-load on key mapping.'';
         };
@@ -195,7 +222,7 @@ in
         with types;
         listOf (oneOf [
           str
-          plugin
+          (submodule plugin)
         ]);
       default = [ ];
       description = ''List of plugins to be installed with neovim.'';