Update nix flake

flake.nix

@@ -23,15 +23,83 @@
             src = ./.;
             vendorHash = "sha256-dj11SRRoB8ZbkcQs75HPI0DpW4c5jzY0N8MD1wKpw+4=";
           };
-        });
+        }
+      );
 
       nixosModules.photocatalog = { config, lib, pkgs, ... }: {
         options.photocatalog = {
           enable = lib.mkEnableOption "Enable photocatalog";
+
+          syncs = mkOption {
+            default = {};
+            description = ''
+              Organization paths with its own params.
+            '';
+            example = {
+
+            };
+            type = types.attrsOf (types.submodule ({ name, ... }: {
+              freeformType = settingsFormat.type;
+              options = {
+                source = mkOption {
+                  type = types.str;
+                  default = name;
+                  description = ''
+                    Source folder path.
+                  '';
+                };
+                target = mkOption {
+                  type = types.str;
+                  description = ''
+                    Target folder path.
+                  '';
+                };
+                overwrite = mkOption {
+                  type = types.bool;
+                  default = false;
+                  description = ''
+                    Overwrite files, existing in target.
+                  '';
+                };
+                watch = mkOption {
+                  type = types.bool;
+                  default = true;
+                  description = ''
+                    Watch for new files in source path.
+                  '';
+                };
+                skipFullSync = mkOption {
+                  type = types.bool;
+                  default = false;
+                  description = ''
+                    Do not make full sync.
+                  '';
+                };
+              };
+            }));
+          };
         };
 
         config = lib.mkIf config.photocatalog.enable {
           environment.systemPackages = [ self.packages.${pkgs.system}.photocatalog ];
+          systemd.services = lib.genAttrs config.photocatalog (sync:
+            {
+              ${sync.name} = {
+                name = "photocatalog_${sync.name}";
+                after = [ "local-fs.target" ];
+                path = [
+                  self.packages.${pkgs.system}.photocatalog
+                ];
+                preStart = lib.mkIf (!sync.skipFullSync) [
+                  "mkdir -p ${sync.target}"
+                  "photocatalog -source ${sync.source} -target ${sync.target}"
+                ];
+                script = [
+                  "photocatalog -source ${sync.source} -target ${sync.target} -skip-full-sync -watch"
+                ];
+              };
+            }
+          );
         };
       };