nix: use lib where possible

Signed-off-by: Myned <dev@bjork.tech>

options/custom/desktops/hyprland/rules.nix

@@ -158,7 +158,7 @@ in {
         merge = field: expr: rules:
           map (
             rule:
-              if builtins.isAttrs field
+              if isAttrs field
               then "${rule}, ${lib.concatStringsSep ", " (lib.mapAttrsToList (f: e: format f e) field)}"
               else "${rule}, ${format field expr}"
           )

options/custom/programs/walker/default.nix

@@ -122,7 +122,7 @@ in {
 
             src = "${pkgs.writeShellApplication {
               name = "search";
-              text = builtins.readFile ./search.sh;
+              text = readFile ./search.sh;
 
               runtimeInputs = with pkgs; [
                 coreutils
@@ -145,7 +145,7 @@ in {
             font: larger ${config.custom.font.monospace};
           }
 
-          ${builtins.readFile ./style.css}
+          ${readFile ./style.css}
         '';
 
         #!! Inherit from default layout

options/custom/programs/wezterm/default.nix

@@ -26,7 +26,7 @@ in {
         -- # TODO: Remove when using Wayland
         config.font_size = ${toString (14 * config.custom.scale)}
 
-        ${builtins.readFile ./config.lua}
+        ${readFile ./config.lua}
 
         return config
       '';

options/custom/scripts/default.nix

@@ -25,7 +25,7 @@ in {
           #// excludeShellChecks = ["SC2154"]; # argc evaluates variables at runtime
 
           runtimeInputs = dependencies;
-          text = builtins.readFile ./${name}.sh;
+          text = readFile ./${name}.sh;
         }
         + "/bin/${name}";
     };
@@ -38,7 +38,7 @@ in {
         pkgs.writers.writePython3Bin name {libraries = dependencies;}
         # Disable linting
         # https://flake8.pycqa.org/en/3.1.1/user/ignoring-errors.html#ignoring-entire-files
-        ("# flake8: noqa\n" + builtins.readFile ./${name}.py)
+        ("# flake8: noqa\n" + readFile ./${name}.py)
         + "/bin/${name}";
     };
   in

options/custom/settings/gtk/default.nix

@@ -17,13 +17,15 @@ in {
       package = pkgs.google-cursor;
     };
 
-    gtk = {
+    gtk = let
+      css = readFile ./style.css;
+    in {
       enable = true;
-      gtk3.extraCss = builtins.readFile ./style.css;
+      gtk3.extraCss = css;
 
       gtk4 = {
         extraConfig.gtk-hint-font-metrics = 1; # Fix blurry fonts
-        extraCss = builtins.readFile ./style.css;
+        extraCss = css;
       };
 
       font = {