treewide: remove redundant stylix.image escaping and string coercion (#2134)

Link: https://github.com/nix-community/stylix/pull/2134

Reviewed-by: Matt Sturgeon <matt@sturgeon.me.uk>

modules/hyprlock/hm.nix

@@ -11,9 +11,7 @@ mkTarget {
     (
       { cfg, image }:
       {
-        programs.hyprlock.settings.background.path = lib.mkIf cfg.useWallpaper "${
-          image
-        }";
+        programs.hyprlock.settings.background.path = lib.mkIf cfg.useWallpaper image;
       }
     )
     (

modules/hyprpaper/hm.nix

@@ -5,7 +5,7 @@ mkTarget {
     {
       services.hyprpaper.settings.wallpaper = lib.singleton {
         monitor = "";
-        path = toString image;
+        path = image;
       };
     };
 }

stylix/palette.nix

@@ -28,10 +28,8 @@ in
     };
 
     image = lib.mkOption {
-      type = lib.types.nullOr lib.types.path;
       # Ensure the path is copied to the store
-      apply =
-        value: if value == null || lib.isDerivation value then value else "${value}";
+      type = with lib.types; nullOr (coercedTo path (src: "${src}") pathInStore);
       description = ''
         Wallpaper image.
 
@@ -80,12 +78,10 @@ in
         # and not anything indirect such as filling a template, otherwise
         # the output of the palette generator will not be protected from
         # garbage collection.
-        default = pkgs.runCommand "palette.json" { } ''
-          ${lib.getExe cfg.paletteGenerator} \
-            "${cfg.polarity}" \
-            ${lib.escapeShellArg cfg.image} \
-            "$out"
-        '';
+        default = pkgs.runCommand "palette.json" {
+          inherit (cfg) image polarity;
+          nativeBuildInputs = [ cfg.paletteGenerator ];
+        } ''palette-generator "$polarity" "$image" "$out"'';
       };
 
       palette = lib.mkOption {