hosts/data.cs.purdue.edu: init

lib/digga.nix

@@ -1,5 +1,6 @@
 { lib }:
 # Importers from digga: https://github.com/divnix/digga/blob/main/src/importers.nix
+# Plus the mkHomeConfigurations generator from digga: https://github.com/divnix/digga/blob/main/src/generators.nix
 let
   flattenTree =
     /*
@@ -120,9 +121,45 @@ let
     lib.filterAttrs (n: v: v != { }) (lib.mapAttrs' collect files);
 
   flattenLeaves = dir: flattenTree (rakeLeaves dir);
+
+  getFqdn = c:
+    let
+      net = c.config.networking;
+      fqdn =
+        if (net ? domain) && (net.domain != null)
+        then "${net.hostName}.${net.domain}"
+        else net.hostName;
+    in
+    fqdn;
 in
 {
   inherit rakeLeaves flattenTree flattenLeaves;
 
   leaves = dir: builtins.attrValues (flattenLeaves dir);
+
+  mkHomeConfigurations = systemConfigurations:
+    /*
+     *
+       Synopsis: mkHomeConfigurations _systemConfigurations_
+
+       Generate the `homeConfigurations` attribute expected by `home-manager` cli
+       from _nixosConfigurations_ or _darwinConfigurations_ in the form
+       _user@hostname_.
+     *
+     */
+    let
+      op = attrs: c:
+        attrs
+        // (
+          lib.mapAttrs'
+            (user: v: {
+              name = "${user}@${getFqdn c}";
+              value = v.home;
+            })
+            c.config.home-manager.users
+        );
+      mkHmConfigs = lib.foldl op { };
+    in
+    mkHmConfigs (builtins.attrValues systemConfigurations);
+
 }