expand syncthing folder options

hosts/nixos/nfss/home.nix

@@ -7,4 +7,10 @@
     ../../../modules/media/tool.nix
   ];
 
+  syncthing-custom.folders = {
+    Credentials.maxAgeDays = 30;
+    Documents.maxAgeDays = 30;
+    Media.maxAgeDays = 7;
+    Archive.maxAgeDays = 30;
+  };
 }

hosts/nixos/thinkpad/home.nix

@@ -8,6 +8,13 @@
     ../../../modules/schedule.nix
   ];
 
+  syncthing-custom.folders = {
+    Credentials.maxAgeDays = 30;
+    Documents.maxAgeDays = 30;
+    Media.maxAgeDays = 7;
+    Archive.maxAgeDays = 30;
+  };
+
   services.scheduled-commands.dcim-consume = {
     enable = true;
     description = "Move files in dcim consume folder to DCIM";

modules/syncthing.nix

@@ -7,21 +7,40 @@ let
   touchDevices = [ "iphone" "ipad" ];
   allDevices = pcDevices ++ touchDevices;
 
-  commonVersioning = {
+  mkFolderOptions = name: { maxAgeDays ? 0 }: {
+    enable = lib.mkEnableOption "${name} folder" // { default = true; };
+    path = lib.mkOption { type = lib.types.str; default = "~/${name}"; };
+    maxAgeDays = lib.mkOption { type = lib.types.int; default = maxAgeDays; };
+  };
+
+  mkVersioning = days:
+    if days == 0 then {}
+    else {
+      versioning = {
         type = "staggered";
         params = {
-      maxAge = "604800"; # 7 days
+          maxAge = toString (days * 86400);
-      cleanInterval = "3600";  # 1 hour
+          cleanInterval = "3600";
         };
       };
+    };
+
+  mkFolder = name: folderCfg: extraAttrs:
+    lib.optionalAttrs folderCfg.enable {
+      ${name} = {
+        path = folderCfg.path;
+        devices = extraAttrs.devices;
+      } // mkVersioning folderCfg.maxAgeDays;
+    };
 
 in
 {
   options.syncthing-custom = {
-    enabledFolders = lib.mkOption {
+    folders = {
-      type = lib.types.listOf lib.types.str;
+      Credentials = mkFolderOptions "Credentials" {};
-      default = [ "Credentials" "Documents" "Archive" "Media" ];
+      Documents = mkFolderOptions "Documents" {};
-      description = "List of Syncthing folders to enable for this host.";
+      Media = mkFolderOptions "Media" {};
+      Archive = mkFolderOptions "Archive" {};
     };
     enableGui = lib.mkOption {
       type = lib.types.bool;
@@ -62,33 +81,10 @@ in
         };
 
         folders =
-          (lib.optionalAttrs (lib.elem "Credentials" cfg.enabledFolders) {
+          mkFolder "Credentials" cfg.folders.Credentials { devices = allDevices; }
-            "Credentials" = {
+          // mkFolder "Documents" cfg.folders.Documents { devices = pcDevices; }
-              path = "~/Credentials";
+          // mkFolder "Media" cfg.folders.Media { devices = lib.filter (d: d != "iphone") allDevices; }
-              devices = allDevices;
+          // mkFolder "Archive" cfg.folders.Archive { devices = allDevices; };
-              versioning = commonVersioning;
-            };
-          })
-          // (lib.optionalAttrs (lib.elem "Documents" cfg.enabledFolders) {
-            "Documents" = {
-              path = "~/Documents";
-              devices = pcDevices;
-              versioning = commonVersioning;
-            };
-          })
-          // (lib.optionalAttrs (lib.elem "Media" cfg.enabledFolders) {
-            "Media" = {
-              path = "~/Media";
-              devices = lib.filter (d: d != "iphone") allDevices;
-            };
-          })
-          // (lib.optionalAttrs (lib.elem "Archive" cfg.enabledFolders) {
-            "Archive" = {
-              path = "~/Archive";
-              devices = allDevices;
-              versioning = commonVersioning;
-            };
-          });
 
         gui = {
           enabled = cfg.enableGui;