Configurable providers with nix

modules/home-manager.nix

@@ -1,6 +1,13 @@
 { config, lib, pkgs, ... }:
 let
   cfg = config.programs.ai-usage;
+  providerNames = [ "claude" "codex" "cursor" ];
+  executablePath = value:
+    if lib.isDerivation value then lib.getExe value else value;
+  enabledProviders = builtins.filter (name: cfg.providers.${name}.enable) providerNames;
+  executableOverrides = lib.mapAttrs
+    (_: provider: executablePath provider.executable)
+    (lib.filterAttrs (_: provider: provider.executable != null) cfg.providers);
 in {
   options.programs.ai-usage = {
     enable = lib.mkEnableOption "AI Usage Monitor for Waybar";
@@ -8,12 +15,42 @@ in {
       type = lib.types.package;
       description = "ai-usage package from this flake.";
     };
+    refreshMinutes = lib.mkOption {
+      type = lib.types.enum [ 5 15 30 60 ];
+      default = 5;
+      description = "How often the daemon refreshes usage, in minutes.";
+    };
+    showUsedPercentage = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = "Show used percentage instead of remaining percentage.";
+    };
+    providers = lib.genAttrs providerNames (name: {
+      enable = lib.mkOption {
+        type = lib.types.bool;
+        default = true;
+        description = "Refresh and show ${name}.";
+      };
+      executable = lib.mkOption {
+        type = lib.types.nullOr (lib.types.either lib.types.str lib.types.package);
+        default = null;
+        example = lib.literalExpression "pkgs.claude-code";
+        description = "Absolute path or package for ${name}. A package uses lib.getExe.";
+      };
+    });
   };
 
   config = lib.mkIf cfg.enable (lib.mkMerge [
     {
       home.packages = [ cfg.package ];
 
+      xdg.configFile."ai-usage/config.json".text = builtins.toJSON {
+        refreshMinutes = cfg.refreshMinutes;
+        enabledProviders = enabledProviders;
+        executableOverrides = executableOverrides;
+        showUsedPercentage = cfg.showUsedPercentage;
+      };
+
       systemd.user.services.ai-usage = {
         Unit = {
           Description = "AI Usage Monitor";