add initial nextcloud module

modules/nextcloud.nix

@@ -0,0 +1,44 @@
+# Changed from https://github.com/nix-community/home-manager/blob/master/modules/services/nextcloud-client.nix
+# I use this instead of the HM module as the autostart wasn't working there
+
+{ config, lib, mylib, pkgs, ... }:
+
+with lib;
+with mylib.modules;
+
+let
+  cfg = config.modules.nextcloud;
+in {
+  options.modules.nextcloud = {
+    enable = mkEnableOpt "Nextcloud Client";
+    autostart = mkBoolOpt false "Autostart the Nextcloud client (systemd)";
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [
+      {
+        assertion = !config.home.services.nextcloud-client.enable;
+        message = "Can't enable both HM nextcloud and my nextcloud module!";
+      }
+    ];
+    # I want to have nextcloud-client in the path when the module is enabled
+    home.packages = with pkgs; [ nextcloud-client ];
+
+    systemd.user.services = (mkIf cfg.autostart) {
+      autostart-nextcloud-client = {
+        Unit = {
+          Description = "Nextcloud Client";
+          PartOf = [ "graphical-session.target" ];
+          After = [ "graphical-session.target" ]; # was graphical-session-pre.target originally in HM
+        };
+
+        Service = {
+          Environment = "PATH=${config.home.profileDirectory}/bin";
+          ExecStart = "${pkgs.nextcloud-client}/bin/nextcloud";
+        };
+
+        Install.WantedBy = [ "graphical-session.target" ];
+      };
+    };
+  };
+}