pypy: add setuphook for PYTHONPATH

pkgs/development/interpreters/pypy/2.0/default.nix

@@ -47,6 +47,7 @@ let
         --replace "libraries = ['curses']" "libraries = ['ncurses']"
     '';
 
+    setupHook = ./setup-hook.sh;
 
     doCheck = true;
     checkPhase = ''

pkgs/development/interpreters/pypy/2.0/setup-hook.sh

@@ -0,0 +1,15 @@
+addPythonPath() {
+    addToSearchPathWithCustomDelimiter : PYTHONPATH $1/lib/pypy2.0/site-packages
+}
+
+toPythonPath() {
+    local paths="$1"
+    local result=
+    for i in $paths; do
+        p="$i/lib/pypy2.0/site-packages"
+        result="${result}${result:+:}$p"
+    done
+    echo $result
+}
+
+envHooks=(${envHooks[@]} addPythonPath)