structure, unison

mod/default.nix

@@ -1 +1,7 @@
-{ ... }: { }
+{ ... }:
+{
+  imports = [ ];
+  home = {
+    imports = [ ./hm ];
+  };
+}

mod/hm/default.nix

@@ -0,0 +1,6 @@
+{ ... }:
+{
+  imports = [
+    ./unison.nix
+  ];
+}

mod/hm/unison.nix

@@ -0,0 +1,28 @@
+{ lib, config, ... }:
+let
+  cfg = config.services.unison';
+in
+{
+  options.services.unison' = {
+    enable = lib.mkEnableOption "Unison file synchronizer";
+    pairs = lib.mkOption {
+      type = lib.types.attrsOf (lib.types.attrsOf (lib.types.listOf lib.types.str));
+      default = { };
+      description = "";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.file = lib.mapAttrs' (name: roots: {
+      name = ".unison/${name}.prf";
+      value.text =
+        ''
+          watch = true
+          logfile = /dev/null
+          confirmbigdeletes = true
+          confirmmerge = true
+        ''
+        + lib.concatStringsSep "\n" (map (root: "root = ${root}") roots.roots);
+    }) cfg.pairs;
+  };
+}