pantheon.elementary-gsettings-schemas: Bring closer to GNOME

- Prefer local builds to avoid costly copying.
- Quote arguments.
- Avoid `with` statements.
- Use `concatMapStringsSep`.
- Format with `nixpkgs-fmt` to fix indentation.

pkgs/desktops/pantheon/desktop/elementary-gsettings-schemas/default.nix

@@ -10,11 +10,13 @@
 , elementary-dock
 , gsettings-desktop-schemas
 , extraGSettingsOverrides ? ""
-, extraGSettingsOverridePackages ? []
+, extraGSettingsOverridePackages ? [ ]
 }:
 
 let
 
+  inherit (lib) concatMapStringsSep;
+
   gsettingsOverridePackages = [
     elementary-dock
     gnome-settings-daemon
@@ -27,25 +29,24 @@ let
 
 in
 
-with lib;
 
 # TODO: Having https://github.com/NixOS/nixpkgs/issues/54150 would supersede this
-runCommand "elementary-gsettings-desktop-schemas" {}
+runCommand "elementary-gsettings-desktop-schemas" { preferLocalBuild = true; }
   ''
-     schema_dir=$out/share/gsettings-schemas/nixos-gsettings-overrides/glib-2.0/schemas
+    data_dir="$out/share/gsettings-schemas/nixos-gsettings-overrides"
+    schema_dir="$data_dir/glib-2.0/schemas"
 
-     mkdir -p $schema_dir
+    mkdir -p "$schema_dir"
+    cp -rf "${glib.getSchemaPath gala}"/*.gschema.override "$schema_dir"
 
-     cp -rf ${glib.getSchemaPath gala}/*.gschema.override $schema_dir
+    ${concatMapStringsSep "\n" (pkg: "cp -rf \"${glib.getSchemaPath pkg}\"/*.xml \"$schema_dir\"") gsettingsOverridePackages}
 
-     ${concatMapStrings (pkg: "cp -rf ${glib.getSchemaPath pkg}/*.xml $schema_dir\n") gsettingsOverridePackages}
+    chmod -R a+w "$data_dir"
+    cp "${glib.getSchemaPath elementary-default-settings}"/* "$schema_dir"
 
-     chmod -R a+w $out/share/gsettings-schemas/nixos-gsettings-overrides
-     cp ${glib.getSchemaPath elementary-default-settings}/* $schema_dir
+    cat - > "$schema_dir/nixos-defaults.gschema.override" <<- EOF
+    ${extraGSettingsOverrides}
+    EOF
 
-     cat - > $schema_dir/nixos-defaults.gschema.override <<- EOF
-     ${extraGSettingsOverrides}
-     EOF
-
-     ${glib.dev}/bin/glib-compile-schemas $schema_dir
+    ${glib.dev}/bin/glib-compile-schemas $schema_dir
   ''