package for nix

Signed-off-by: Slendi <slendi@socopon.com>

LICENSE

@@ -0,0 +1,15 @@
+mpd-discord-presence: MPD Discord daemon
+Copyright (C) 2025  Slendi
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published
+by the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "Rust flake";
+  description = "MPD Discord daemon";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
@@ -12,6 +12,7 @@
 
   outputs =
     {
+      self,
       nixpkgs,
       flake-utils,
       fenix,
@@ -21,7 +22,7 @@
       overlay =
         final: prev:
         let
-          fenixPkgs = fenix.packages.${final.system};
+          fenixPkgs = fenix.packages.${final.stdenv.hostPlatform.system};
         in
         {
           rustToolchain =
@@ -40,6 +41,7 @@
     in
     {
       overlays.default = overlay;
+      homeManagerModules.mpd-discord-presence = import ./nix/mpd-discord-presence.nix;
     }
     // flake-utils.lib.eachDefaultSystem (
       system:
@@ -65,6 +67,27 @@
             export RUST_SRC_PATH="${pkgs.rustToolchain}/lib/rustlib/src/rust/library"
           '';
         };
+
+        packages = rec {
+          mpd-discord-presence = pkgs.rustPlatform.buildRustPackage {
+            pname = "mpd-discord-presence";
+            version = "0.1.0";
+
+            src = ./.;
+
+            cargoLock.lockFile = ./Cargo.lock;
+
+            enableParallelBuild = true;
+
+            meta = {
+              description = "MPD Discord daemon";
+              homepage = "https://git.slendi.dev/Slendi/mpd-discord-presence";
+              license = pkgs.lib.licenses.gpl3;
+              mainProgrma = "mpd-discord-presence";
+            };
+          };
+          default = mpd-discord-presence;
+        };
       }
     );
 }

nix/mpd-discord-presence.nix

@@ -0,0 +1,45 @@
+{ config, lib, pkgs, self, ... }:
+let
+  cfg = config.mpd-discord-presence;
+  defaultPkg =
+    self.packages.${pkgs.stdenv.hostPlatform.system}.mpd-discord-presence;
+in
+{
+  options.mpd-discord-presence = {
+    enable = lib.mkEnableOption "mpd-discord-presence (systemd user service)";
+
+    package = lib.mkOption {
+      type = lib.types.package;
+      default = defaultPkg;
+      description = "Package providing the mpd-discord-presence binary.";
+    };
+
+    extraArgs = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [];
+      description = "Extra CLI args passed to mpd-discord-presence.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.packages = [ cfg.package ];
+
+    systemd.user.services.mpd-discord-presence = {
+      Unit = {
+        Description = "MPD Discord Presence";
+        Wants = [ "mpd.service" ];
+        After = [ "mpd.service" "network-online.target" ];
+      };
+
+      Service = {
+        ExecStart = "${cfg.package}/bin/mpd-discord-presence ${lib.escapeShellArgs cfg.extraArgs}";
+        Restart = "on-failure";
+        RestartSec = 2;
+      };
+
+      Install = {
+        WantedBy = [ "default.target" ];
+      };
+    };
+  };
+}