Add modules/services/syncthing.nix

Generalizes the module so it's not so Henrik-centric. I know,
blasphemous, but the world only sometimes revolves around me.

Also, adds a new, much simpler config for syncthing.

hosts/personal.nix

@@ -28,4 +28,22 @@ with lib;
 
   ##
   modules.shell.bitwarden.config.server = "p.v0.io";
+
+  services.syncthing.declarative = {
+    devices = {
+      kuro.id  = "4UJSUBN-V7LCISG-6ZE7SBN-YPXM5FQ-CE7CD2U-W4KZC7O-4HUZZSW-6DXAGQQ";
+      shiro.id = "G4DUO25-AMQQIWS-SRZE5TJ-43CCQZJ-5ULEZBS-P2LMZZU-V5JA5CS-6X7RLQK";
+      kiiro.id = "DPQT4XQ-Q4APAYJ-T7P4KMY-YBLDKLC-7AU5Y4S-VGT3DDT-TMZZEIX-GBA7DAM";
+    };
+    folders =
+      let mkShare = name: devices: type: path: rec {
+            inherit devices type path;
+            watch = false;
+            rescanInterval = 3600 * 4;
+            enabled = lib.elem config.networking.hostname devices;
+          };
+      in {
+        projects = mkShare "projects" [ "kuro" "shiro" ] "sendrecieve" "${config.user.home}/projects";
+      };
+  };
 }

modules/services/syncthing.nix

@@ -0,0 +1,20 @@
+{ config, options, pkgs, lib, ... }:
+
+with lib;
+with lib.my;
+let cfg = config.modules.services.syncthing;
+in {
+  options.modules.services.syncthing = {
+    enable = mkBoolOpt false;
+  };
+
+  config = mkIf cfg.enable {
+    services.syncthing = rec {
+      enable = true;
+      openDefaultPorts = true;
+      user = config.user.name;
+      configDir = "/home/${user}/.config/syncthing";
+      dataDir = "/home/${user}/.local/share/syncthing";
+    };
+  };
+}