modules/input: add options to configure leaders

modules/input.nix

@@ -7,6 +7,17 @@ let
 in
 {
   options.input = with lib; with types; {
+    leader = mkOption {
+      type = str;
+      default = ''\'';
+      apply = x: assert (builtins.stringLength x == 1 || abort "<Leader> `${x}` is longer than one character is not allowed"); x;
+    };
+    localLeader = mkOption {
+      type = str;
+      default = ''\'';
+      apply = x: assert (builtins.stringLength x == 1 || abort "<LocalLeader> `${x}` is longer than one character is not allowed"); x;
+    };
+
     exMode.enable = (mkEnableOption "Ex mode") // { default = true; };
     arrowKeys = {
       disableInMode = mkOption {
@@ -22,7 +33,10 @@ in
     };
   };
 
-  config.vim.keymap.set =
+  config = {
+    vim.g.mapleader = cfg.leader;
+
+    vim.keymap.set =
       # Disable the annoying and useless ex-mode
       lib.optionals (!cfg.exMode.enable) (disableKeymaps "n" [ "Q" "gQ" ])
       # Disable arrow keys
@@ -31,4 +45,5 @@ in
       # Disable PageUp / PageDown
       ++ lib.optionals (cfg.pageButtons.disableInMode != [ ])
         (disableKeymaps cfg.pageButtons.disableInMode [ "<PageUp>" "<PageDown>" ]);
+  };
 }