Nix: add home-manager module

flake.nix

@@ -39,6 +39,11 @@
       (self.overlays.default null pkgsFor.${system})
       // {default = self.packages.${system}.hyprpaper;});
 
+    homeManagerModules = {
+      default = self.homeManagerModules.hyprpaper;
+      hyprpaper = import ./nix/hm-module.nix self;
+    };
+
     formatter = genSystems (system: pkgsFor.${system}.alejandra);
   };
 }

nix/hm-module.nix

@@ -0,0 +1,102 @@
+self: {
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (builtins) toString;
+  inherit (lib.types) bool float listOf package str;
+  inherit (lib.modules) mkIf;
+  inherit (lib.options) mkOption mkEnableOption;
+  inherit (lib.meta) getExe;
+
+  boolToString = x:
+    if x
+    then "true"
+    else "false";
+  cfg = config.services.hyprpaper;
+in {
+  options.services.hyprpaper = {
+    enable = mkEnableOption "Hyprpaper, Hyprland's wallpaper utility";
+
+    package = mkOption {
+      description = "The hyprpapr package";
+      type = package;
+      default = self.packages.${pkgs.stdenv.hostPlatform.system}.hyprpaper;
+    };
+
+    ipc = mkOption {
+      description = "Whether to enable IPC";
+      type = bool;
+      default = true;
+    };
+
+    splash = mkOption {
+      description = "Enable rendering of the hyprland splash over the wallpaper";
+      type = bool;
+      default = false;
+    };
+
+    splash_offset = mkOption {
+      description = "How far (in % of height) up should the splash be displayed";
+      type = float;
+      default = 2.0;
+    };
+
+    preloads = mkOption {
+      description = "List of paths to images that will be loaded into memory.";
+      type = listOf str;
+      example = [
+        "~/Images/wallpapers/forest.png"
+        "~/Images/wallpapers/desert.png"
+      ];
+    };
+
+    wallpapers = mkOption {
+      description = "The wallpapers";
+      type = listOf str;
+      example = [
+        "eDP-1,~/Images/wallpapers/forest.png"
+        "DP-7,~/Images/wallpapers/desert.png"
+      ];
+    };
+  };
+
+  config = mkIf cfg.enable {
+    xdg.configFile."hypr/hyprpaper.conf".text = ''
+      ipc = ${
+        if cfg.ipc
+        then "on"
+        else "off"
+      }
+      splash = ${boolToString cfg.splash}
+      splash_offset = ${toString cfg.splash_offset}
+
+      ${
+        builtins.concatStringsSep "\n"
+        (
+          map (preload: "preload = ${preload}") cfg.preloads
+        )
+      }
+      ${
+        builtins.concatStringsSep "\n"
+        (
+          map (wallpaper: "wallpaper = ${wallpaper}") cfg.wallpapers
+        )
+      }
+    '';
+
+    systemd.user.services.hyprpaper = {
+      Unit = {
+        Description = "Hyprland wallpaper daemon";
+        PartOf = ["graphical-session.target"];
+      };
+
+      Service = {
+        ExecStart = "${getExe cfg.package}";
+        Restart = "on-failure";
+      };
+      Install.WantedBy = ["graphical-session.target"];
+    };
+  };
+}