refactor(modules): rewrite some modules; add dconf

hosts/shared/xonsh.nix

@@ -4,15 +4,12 @@
   lib,
   ...
 }: let
-  cfg = config.alqueva.xonsh;
-  attrsToPyDict = attrs: (lib.pipe attrs [
-    (builtins.mapAttrs (n: v: "aliases['${n}'] = '${v}'"))
-    builtins.attrValues
-    (lib.concatStringsSep "\n")
-    (s: s + "\n")
-  ]);
+  cfg = config.alqueva.shells.xonsh;
+  aliasesToPyDict = aliases:
+    lib.concatStringsSep "\n"
+    (lib.mapAttrsToList (k: v: "aliases['${k}'] = '${v}'") aliases);
 in {
-  options.alqueva.xonsh = {
+  options.alqueva.shells.xonsh = {
     enable = lib.mkEnableOption "xonsh";
     package = lib.mkPackageOption pkgs "xonsh" {};
   };
@@ -20,13 +17,14 @@ in {
   config = lib.mkIf cfg.enable {
     programs = {
       xonsh = {
-        config =
-          "from xonsh.xontribs import get_xontribs\n"
-          + attrsToPyDict config.environment.shellAliases
-          + ''
-            for xontrib in get_xontribs():
-                xontrib load @(xontrib)
-          '';
+        config = ''
+          from xonsh.xontribs import get_xontribs
+
+          ${aliasesToPyDict config.environment.shellAliases}
+
+          for xontrib in get_xontribs():
+              xontrib load @(xontrib)
+        '';
         inherit (cfg) package;
         enable = true;
       };