nix: init home-manager module

flake.nix

@@ -30,6 +30,11 @@
       default = inputs.self.packages.${system}.hypridle;
     });
 
+    homeManagerModules = {
+      hypridle = import ./nix/hm-module.nix inputs.self;
+      default = inputs.self.homeManagerModules.hypridle;
+    };
+
     checks = genSystems (system: inputs.self.packages.${system});
 
     formatter = genSystems (system: pkgsFor.${system}.alejandra);

nix/hm-module.nix

@@ -0,0 +1,84 @@
+self: {
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (builtins) toString;
+  inherit (lib.types) str int package;
+  inherit (lib.modules) mkIf;
+  inherit (lib.options) mkOption mkEnableOption;
+  inherit (lib.meta) getExe;
+
+  cfg = config.services.hypridle;
+in {
+  options.services.hypridle = {
+    enable = mkEnableOption "Hypridle, Hyprland's idle daemon";
+
+    package = mkOption {
+      description = "The hypridle package";
+      type = package;
+      default = self.packages.${pkgs.stdenv.hostPlatform.system}.hypridle;
+    };
+
+    timeout = {
+      description = "The timeout for the hypridle service, in seconds";
+      type = int;
+      default = 500;
+    };
+
+    onTimeout = {
+      description = "The command to run when the timeout is reached";
+      type = str;
+      default = "echo 'timeout reached'";
+    };
+
+    onResume = {
+      description = "The command to run when the service resumes";
+      type = str;
+      default = "echo 'service resumed'";
+    };
+
+    lockCmd = {
+      description = "The command to run when the service locks";
+      type = str;
+      default = "echo 'lock!'";
+    };
+
+    unlockCmd = {
+      description = "The command to run when the service unlocks";
+      type = str;
+      default = "echo 'unlock!'";
+    };
+
+    beforeSleepCmd = {
+      description = "The command to run before the service sleeps";
+      type = str;
+      default = "echo 'Zzz...'";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    xdg.configFile."hypr/hypridle.conf".text = ''
+      listener {
+        timeout = ${toString cfg.timeout};
+        on-timeout = ${cfg.onTimeout}
+        on-resume = ${cfg.onResume}
+        lock_cmd = ${cfg.lockCmd}
+        unlock_cmd = ${cfg.unlockCmd}
+        before_sleep_cmd = ${cfg.beforeSleepCmd}
+      }
+    '';
+
+    systemd.user.services.hypridle = {
+      description = "Hypridle";
+      after = ["graphical-session.target"];
+      wantedBy = ["default.target"];
+      serviceConfig = {
+        ExecStart = "${getExe cfg.package}";
+        Restart = "always";
+        RestartSec = "10";
+      };
+    };
+  };
+}