kde5.startkde: append extra PATH elements; set Qt search paths

pkgs/desktops/kde-5/plasma/startkde/default.nix

@@ -1,16 +1,15 @@
-{ stdenv, lib, runCommand
-, dbus, qttools, socat
-, gnugrep, gnused
-, kconfig, kinit, kservice
-, plasma-workspace
-, xmessage, xprop, xsetroot
+{
+  stdenv, lib, runCommand, dbus, qttools, socat, gnugrep, gnused, kconfig,
+  kinit, kservice, plasma-workspace, xmessage, xprop, xsetroot, qtbase,
+  qtdeclarative, qtgraphicaleffects, qtquickcontrols, qtscript, qtsvg,
+  qtx11extras, qtxmlpatterns
 }:
 
 let
 
   env = {
     inherit (stdenv) shell;
-    paths = builtins.map (pkg: pkg.out or pkg)
+    bins = builtins.map (pkg: pkg.out or pkg)
       [
         dbus qttools socat
         gnugrep gnused
@@ -18,15 +17,38 @@ let
         plasma-workspace
         xmessage xprop xsetroot
       ];
+    libs = builtins.map (pkg: pkg.out or pkg)
+      [
+        qtbase qtdeclarative qtgraphicaleffects qtquickcontrols
+        qtscript qtsvg qtx11extras qtxmlpatterns
+      ];
   };
 
 in runCommand "startkde" env ''
-  prefix_PATH=
-  for pkg in $paths; do
-    addToSearchPath prefix_PATH "$pkg/bin"
-    addToSearchPath prefix_PATH "$pkg/lib/libexec"
-    addToSearchPath prefix_PATH "$pkg/lib/libexec/kf5"
+
+  # Configure PATH variable
+  suffixPATH=
+  for p in $bins; do
+      addToSearchPath suffixPATH "$p/bin"
+      addToSearchPath suffixPATH "$p/lib/libexec"
+      addToSearchPath suffixPATH "$p/lib/libexec/kf5"
   done
-  substitute ${./startkde.sh} "$out" --subst-var shell --subst-var prefix_PATH
+
+  # Configure Qt search paths
+  QT_PLUGIN_PATH=
+  QML_IMPORT_PATH=
+  QML2_IMPORT_PATH=
+  for p in $libs; do
+      addToSearchPath QT_PLUGIN_PATH "$p/lib/qt5/plugins"
+      addToSearchPath QML_IMPORT_PATH "$p/lib/qt5/imports"
+      addToSearchPath QML2_IMPORT_PATH "$p/lib/qt5/qml"
+  done
+
+  substitute ${./startkde.sh} "$out" \
+      --subst-var shell \
+      --subst-var suffixPATH \
+      --subst-var QT_PLUGIN_PATH \
+      --subst-var QML_IMPORT_PATH \
+      --subst-var QML2_IMPORT_PATH
   chmod +x "$out"
 ''

pkgs/desktops/kde-5/plasma/startkde/startkde.sh

@@ -1,6 +1,10 @@
 #!@shell@
 
-PATH="@prefix_PATH@:$PATH"
+PATH="$PATH${PATH:+:}@suffixPATH@"
+
+export QT_PLUGIN_PATH="$QT_PLUGIN_PATH${QT_PLUGIN_PATH:+:}@QT_PLUGIN_PATH@"
+export QML_IMPORT_PATH="$QML_IMPORT_PATH${QML_IMPORT_PATH:+:}@QML_IMPORT_PATH@"
+export QML2_IMPORT_PATH="$QML2_IMPORT_PATH${QML2_IMPORT_PATH:+:}@QML2_IMPORT_PATH@"
 
 # The KDE icon cache is supposed to update itself
 # automatically, but it uses the timestamp on the icon