dbus: stylize, use placeholder

pkgs/development/libraries/dbus/default.nix

@@ -1,24 +1,31 @@
-{ stdenv, lib, fetchurl, pkgconfig, expat, systemd
-, libX11 ? null, libICE ? null, libSM ? null, x11Support ? (stdenv.isLinux || stdenv.isDarwin) }:
+{ stdenv
+, lib
+, fetchurl
+, pkgconfig
+, expat
+, systemd
+, libX11 ? null
+, libICE ? null
+, libSM ? null
+, x11Support ? (stdenv.isLinux || stdenv.isDarwin)
+, dbus
+}:
 
-assert x11Support -> libX11 != null
-                  && libICE != null
-                  && libSM != null;
+assert
+  x11Support ->
+    libX11 != null && libICE != null && libSM != null;
 
-let
+stdenv.mkDerivation rec {
+  pname = "dbus";
   version = "1.12.16";
-  sha256 = "107ckxaff1cv4q6kmfdi2fb1nlsv03312a7kf6lb4biglhpjv8jl";
-
-self = stdenv.mkDerivation {
-    name = "dbus-${version}";
-    inherit version;
 
   src = fetchurl {
     url = "https://dbus.freedesktop.org/releases/dbus/dbus-${version}.tar.gz";
-      inherit sha256;
+    sha256 = "107ckxaff1cv4q6kmfdi2fb1nlsv03312a7kf6lb4biglhpjv8jl";
   };
 
   patches = lib.optional stdenv.isSunOS ./implement-getgrouplist.patch;
+
   postPatch = ''
     substituteInPlace tools/Makefile.in \
       --replace 'install-localstatelibDATA:' 'disabled:' \
@@ -35,23 +42,32 @@ self = stdenv.mkDerivation {
 
   outputs = [ "out" "dev" "lib" "doc" ];
 
-    nativeBuildInputs = [ pkgconfig ];
-    propagatedBuildInputs = [ expat ];
-    buildInputs = lib.optional stdenv.isLinux systemd
-      ++ lib.optionals x11Support [ libX11 libICE libSM ];
+  nativeBuildInputs = [
+    pkgconfig
+  ];
+
+  propagatedBuildInputs = [
+    expat
+  ];
+
+  buildInputs = lib.optionals x11Support [
+    libX11
+    libICE
+    libSM
+  ] ++ lib.optional stdenv.isLinux systemd;
   # ToDo: optional selinux?
 
   configureFlags = [
+    "--enable-user-session"
+    "--libexecdir=${placeholder ''out''}/libexec"
     "--localstatedir=/var"
-      "--sysconfdir=/etc"
     "--runstatedir=/run"
+    "--sysconfdir=/etc"
     "--with-session-socket-dir=/tmp"
     "--with-system-pid-file=/run/dbus/pid"
     "--with-system-socket=/run/dbus/system_bus_socket"
-      "--with-systemdsystemunitdir=$(out)/etc/systemd/system"
-      "--with-systemduserunitdir=$(out)/etc/systemd/user"
-      "--enable-user-session"
-      "--libexecdir=$(out)/libexec"
+    "--with-systemdsystemunitdir=${placeholder ''out''}/etc/systemd/system"
+    "--with-systemduserunitdir=${placeholder ''out''}/etc/systemd/user"
   ] ++ lib.optional (!x11Support) "--without-x";
 
   # Enable X11 autolaunch support in libdbus. This doesn't actually depend on X11
@@ -64,7 +80,10 @@ self = stdenv.mkDerivation {
 
   doCheck = true;
 
-    installFlags = [ "sysconfdir=$(out)/etc" "datadir=$(out)/share" ];
+  installFlags = [
+    "sysconfdir=${placeholder ''out''}/etc"
+    "datadir=${placeholder ''out''}/share"
+  ];
 
   postInstall = ''
     mkdir -p "$out/share/xml/dbus"
@@ -78,8 +97,8 @@ self = stdenv.mkDerivation {
   '';
 
   passthru = {
-      dbus-launch = "${self.lib}/bin/dbus-launch";
-      daemon = self.out;
+    dbus-launch = "${dbus.lib}/bin/dbus-launch";
+    daemon = dbus.out;
   };
 
   meta = with stdenv.lib; {
@@ -88,5 +107,4 @@ self = stdenv.mkDerivation {
     license = licenses.gpl2Plus; # most is also under AFL-2.1
     platforms = platforms.unix;
   };
-  };
-in self
+}