sway: Decouple xdg.configFiles

This also adds an empty let binding to the waybar config to avoid an
upcoming commit to introduce a huge diff (twice, since this commit also
would have reformatted the entire waybar configuration).

users/simon/modules/sway.nix

@@ -271,9 +271,30 @@ lib.mkIf nixosConfig.sbruder.gui.enable {
     wdisplays # graphical output manager
   ];
 
-  xdg.configFile = {
+  # FIXME deduplicate (everything except text is redundant)
+  xdg.configFile."swaynag/config".text = ''
+    font=Monospace 12
+
+    [warning]
+    text=b58900
+    background=fdf6e3
+    border=eee8d5
+    border-bottom=eee8d5
+    button-background=eee8d5
+
+    [error]
+    text=dc322f
+    background=fdf6e3
+    border=eee8d5
+    border-bottom=eee8d5
+    button-background=eee8d5
+  '';
+
   # home-manager’s waybar module performs additional checks that are overly strict
-    "waybar/config".text = lib.generators.toJSON { } {
+  xdg.configFile."waybar/config".text =
+    let
+    in
+    lib.generators.toJSON { } {
       layer = "top";
       position = "top";
       height = 24;
@@ -451,28 +472,9 @@ lib.mkIf nixosConfig.sbruder.gui.enable {
         tooltip-format = "<big>{:%Y %B}</big>\n<tt><small>{calendar}</small></tt>";
       };
     };
-    "waybar/style.css".source = pkgs.substituteAll ({
+  xdg.configFile."waybar/style.css".source = pkgs.substituteAll ({
     src = ../files/waybar/style.css;
   } // solarized);
-    # FIXME deduplicate (everything except text is redundant)
-    "swaynag/config".text = ''
-      font=Monospace 12
-
-      [warning]
-      text=b58900
-      background=fdf6e3
-      border=eee8d5
-      border-bottom=eee8d5
-      button-background=eee8d5
-
-      [error]
-      text=dc322f
-      background=fdf6e3
-      border=eee8d5
-      border-bottom=eee8d5
-      button-background=eee8d5
-    '';
-  };
 
   systemd.user.services.waybar = {
     Unit = {