WIP: feat(flake): Add home-manager module

flake.nix

@@ -46,5 +46,10 @@
       timewall = pkgs.callPackage ./nix/package.nix {inherit rev;};
       default = timewall;
     });
+
+    homeManagerModules = rec {
+      timewall = import ./nix/hm-module.nix self;
+      default = timewall;
+    };
   };
 }

nix/hm-module.nix

@@ -0,0 +1,114 @@
+self: {
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (pkgs.stdenv.hostPlatform) system;
+  cfg = config.services.timewall;
+  package = self.packages.${system}.default;
+  configFormat = pkgs.formats.toml {};
+in {
+  options = {
+    services.timewall = {
+      enable = lib.mkEnableOption "timewall";
+
+      package = lib.mkPackageOption self.packages.${system} "timewall" {
+        default = "default";
+        pkgsText = "timewall.packages.\${pkgs.system}";
+      };
+
+      systemdTarget = lib.mkOption {
+        type = lib.types.str;
+        default = "graphical-session.target";
+        description = "Systemd target to bind to.";
+      };
+
+      wallpaperPath = lib.mkOption {
+        type = with lib.types; nullOr path;
+        default = null;
+        description = "Path to the HEIF/HEIC dyncamic wallpaper file to set.";
+      };
+
+      config = {
+        location = {
+          lat = lib.mkOption {
+            type = with lib.types; nullOr (either float int);
+            default = null;
+            description = "Your geographical latitude.";
+          };
+          lon = lib.mkOption {
+            type = with lib.types; nullOr (either float int);
+            default = null;
+            description = "You geographical longitude.";
+          };
+        };
+
+        setter = {
+          command = lib.mkOption {
+            type = with lib.types; nullOr (listOf str);
+            default = null;
+            description = ''
+              Command to set the wallpaper. Use "%f" as a placeholder for the file path.
+              The command is NOT passed to a shell.
+            '';
+            example = ["sww" "img" "%f"];
+          };
+        };
+
+        daemon = {
+          update_interval_seconds = lib.mkOption {
+            type = with lib.types; nullOr int;
+            default = null;
+            description = "Interval between wallpaper updates in seconds.";
+          };
+        };
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = (cfg.config.location.lat != null) == (cfg.config.location.lon != null);
+        message = "Both `latitude and `longitude` must be set for timewall";
+      }
+    ];
+
+    home.packages = [cfg.package];
+
+    xdg.configFile."timewall/config.toml".source = configFormat.generate "config.toml" (
+      lib.optionalAttrs (cfg.config.location.lat != null && cfg.config.location.lon != null) {
+        inherit (cfg.config) location;
+      }
+      // lib.optionalAttrs (cfg.config.setter.command != null) {
+        inherit (cfg.config) setter;
+      }
+      // lib.optionalAttrs (cfg.config.daemon.update_interval_seconds != null) {
+        inherit (cfg.config) daemon;
+      }
+    );
+
+    systemd.user.services.timewall = {
+      Unit = {
+        Description = "Dynamic wallpapers daemon";
+        PartOf = ["graphical-session.target"];
+        X-Restart-Triggers =
+          lib.mkIf (cfg.config != {})
+          ["${config.xdg.configFile."timewall/config.toml".source}"];
+      };
+      Service = {
+        ExecStart = builtins.concatStringsSep " " [
+          "${lib.getExe package} set --daemon"
+          (
+            if cfg.wallpaperPath != null
+            then builtins.toString cfg.wallpaperPath
+            else ""
+          )
+        ];
+        Restat = "on-failure";
+      };
+      Install.WantedBy = [cfg.systemdTarget];
+    };
+  };
+}