From d007d1f2f7d9b4c658d684c60b2767718e5f2383 Mon Sep 17 00:00:00 2001
From: "Agatha V. Lovelace" <agatha@technogothic.net>
Date: Sat, 15 Apr 2023 12:29:10 +0200
Subject: [PATCH] Provide NixOS module

---
 README.md | 39 +++++++++++++--------------------------
 flake.nix | 41 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 53 insertions(+), 27 deletions(-)

diff --git a/README.md b/README.md
index 206fdf8..aa5a51b 100644
--- a/README.md
+++ b/README.md
@@ -43,35 +43,22 @@ This repository also contains a Nix flake. It can be used in a NixOS configurati
 ```nix
 url-eater.url = "github:AgathaSorceress/url-eater";
 ```
-2. Add package
+2. Import NixOS module
 ```nix
-nixpkgs.overlays = [
-  (final: prev: {
-    url-eater = url-eater.defaultPackage.${final.system};
-  })
-];
+imports = [ url-eater.nixosModule ];
 ```
-3. Add a module that defines a systemd service:
+3. Configure the module:
 ```nix
-{ pkgs, ... }:
-let
-  filters = pkgs.writeText "filters.kdl" ''
-    category "Spotify" {
-    	params "context@open.spotify.com" "si@open.spotify.com"
-    }
-    category "Twitter" {
-    	params "cxt@*.twitter.com" "ref_*@*.twitter.com" "s@*.twitter.com" "t@*.twitter.com" "twclid"
-    }
-  '';
-in {
-  systemd.user.services."url-eater" = {
-    description = "Clipboard URL cleanup service";
-
-    after = [ "graphical-session-pre.target" ];
-    wantedBy = [ "graphical-session.target" ];
-
-    script = ''
-      exec ${pkgs.url-eater}/bin/url-eater ${filters}
+{ ... }: {
+  services.url-eater = {
+    enable = true;
+    filters = ''
+      category "Spotify" {
+      	params "context@open.spotify.com" "si@open.spotify.com"
+      }
+      category "Twitter" {
+      	params "cxt@*.twitter.com" "ref_*@*.twitter.com" "s@*.twitter.com" "t@*.twitter.com" "twclid"
+      }
     '';
   };
 }
diff --git a/flake.nix b/flake.nix
index 845d2de..573f9b1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -24,5 +24,44 @@
             ];
             RUST_SRC_PATH = rustPlatform.rustLibSrc;
           };
-      });
+      }) // {
+        nixosModule = { config, lib, pkgs, ... }:
+          with lib;
+          let cfg = config.services.url-eater;
+          in {
+            options.services.url-eater = {
+              enable = mkEnableOption "Enables the URL Eater service";
+              filters = mkOption {
+                type = types.str;
+                example = ''
+                  category "Spotify" {
+                  	params "context@open.spotify.com" "si@open.spotify.com"
+                  }
+                  category "Twitter" {
+                  	params "cxt@*.twitter.com" "ref_*@*.twitter.com" "s@*.twitter.com" "t@*.twitter.com" "twclid"
+                  }
+                '';
+                description = mdDoc ''
+                  A list of filters to use, in the KDL file format.
+                '';
+              };
+            };
+
+            config = mkIf cfg.enable {
+              systemd.user.services."url-eater" = let
+                filters = pkgs.writeText "filters.kdl" cfg.filters;
+                pkg = self.defaultPackage.${pkgs.system};
+              in {
+                description = "Clipboard URL cleanup service";
+
+                after = [ "graphical-session-pre.target" ];
+                wantedBy = [ "graphical-session.target" ];
+
+                script = ''
+                  exec ${pkg}/bin/url-eater ${filters}
+                '';
+              };
+            };
+          };
+      };
 }