add xresources manager

modules/lass/xresources.nix

@@ -0,0 +1,108 @@
+{ config, lib, pkgs, ... }:
+
+#TODO:
+#prefix with Attribute Name
+#ex: urxvt
+
+#TODO: make users configureable
+#
+#we need something like this:
+#
+#a.u = [1 2];
+#a.x = "test";
+
+#b.u = [1];
+#b.x = "tast";
+
+#    |
+#    v
+
+#1."test\ntast";
+#2."test";
+#
+#
+#users = mkOption {
+#  type = types.str;
+#  default = ;
+#  description = ''
+#    users for this xresources config.
+#  '';
+#};
+with builtins;
+with lib;
+
+
+let
+
+  inherit (import ../../lib { inherit pkgs; }) shell-escape;
+  inherit (pkgs) writeScript;
+
+in
+
+{
+
+  options = {
+    services.xresources.enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to enable the automatic loading of Xresources definitions at display-manager start;
+      '';
+    };
+
+    services.xresources.user = mkOption {
+      type = types.str;
+      default = "nobody";
+      description = ''
+        The user the xresources should be loaded as.
+      '';
+    };
+
+    services.xresources.resources = mkOption {
+      default = {};
+      type = types.attrsOf types.str;
+      example = {
+        urxvt = ''
+          URxvt*scrollBar: false
+          URxvt*urgentOnBell: true
+        '';
+      };
+      description = ''
+        Xresources definitions.
+      '';
+    };
+  };
+
+  config = 
+    let
+      cfg = config.services.xresources;
+      user = cfg.user;
+      xres = concatStringsSep "\n" (attrValues cfg.resources);
+
+      mkService = user: xres: rec {
+        description = "xresources managment script";
+        requires = [ "display-manager.service" ];
+        after = requires;
+        path = [ pkgs.xlibs.xrdb ];
+
+        #TODO: make DISPLAY configurable
+        environment = {
+          DISPLAY = ":0";
+        };
+        serviceConfig = {
+          Type = "oneshot";
+          User = user;
+          RemainAfterExit = "yes";
+          ExecStart = writeScript "${user}-xresources-init" ''
+            #!/bin/sh
+            echo ${shell-escape xres} | xrdb -merge
+          '';
+        };
+      };
+
+    in mkIf cfg.enable {
+        systemd.services."${user}-xresources" = mkService user xres;
+      };
+      
+
+}