From 9e387aa6731792dc879afd5a6ad98a3e63571387 Mon Sep 17 00:00:00 2001
From: NotAShelf <raf@notashelf.dev>
Date: Wed, 8 Jan 2025 13:25:35 +0300
Subject: [PATCH] nix: enable power-profiles-daemon while batmon is enabled;
 assert

---
 nix/module.nix | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/nix/module.nix b/nix/module.nix
index 7e94df7..bbfe79e 100644
--- a/nix/module.nix
+++ b/nix/module.nix
@@ -4,7 +4,7 @@ self: {
   lib,
   ...
 }: let
-  inherit (lib.modules) mkIf mkForce;
+  inherit (lib.modules) mkIf mkForce mkDefault;
   inherit (lib.options) mkOption mkEnableOption;
   inherit (lib) types;
 
@@ -37,16 +37,25 @@ in {
   };
 
   config = mkIf cfg.enable {
-    # Create the batmon configuration file in /etc/batmon.json
-    environment.etc."batmon.json".source = format.generate "batmon.json" cfg.settings;
+    environment = {
+      systemPackages = [cfg.package];
 
-    environment.systemPackages = [cfg.package];
+      # Create the batmon configuration file in /etc/batmon.json
+      etc."batmon.json".source = format.generate "batmon.json" cfg.settings;
+    };
+
+    # Batmon depends on power-profiles daemon
+    services.power-profiles-daemon.enable = mkDefault true;
 
     systemd.user.services.batmon = {
       description = "Simple, reactive power management service";
       documentation = ["https://github.com/NotAShelf/batmon"];
       wantedBy = ["multi-user.target"];
-      environment.PATH = mkForce "/run/wrappers/bin:${lib.makeBinPath [cfg.package]}";
+      environment.PATH = mkForce "/run/wrappers/bin:${lib.makeBinPath [
+        # Batmon expects powerprofilesctl in PATH
+        config.services.power-profiles-daemon.package
+      ]}";
+
       script = ''
         ${lib.getExe cfg.package} --config /etc/batmon.json
       '';
@@ -56,5 +65,12 @@ in {
         Restart = "on-failure";
       };
     };
+
+    assertions = [
+      {
+        assertion = config.services.power-profiles-daemon.enable;
+        message = "Batmon requies 'services.power-profiles-daemon.enable' to be true!";
+      }
+    ];
   };
 }