pew: 1.1.2 -> 1.2.0, fix build

pkgs/development/tools/pew/default.nix

@@ -1,7 +1,10 @@
-{ stdenv, python3Packages }:
-with python3Packages; buildPythonApplication rec {
+{ stdenv, python3 }:
+
+with python3.pkgs;
+
+buildPythonApplication rec {
   pname = "pew";
-    version = "1.1.2";
+  version = "1.2.0";
 
   src = fetchPypi {
     inherit pname version;
@@ -10,25 +13,18 @@ with python3Packages; buildPythonApplication rec {
 
   propagatedBuildInputs = [ virtualenv virtualenv-clone setuptools ];
 
-    LC_ALL = "en_US.UTF-8";
-
-    postFixup = ''
-      set -euo pipefail
-      PEW_SITE="$out/lib/${python.libPrefix}/site-packages"
-      SETUPTOOLS="${setuptools}/lib/${python.libPrefix}/site-packages"
-      SETUPTOOLS_SITE=$SETUPTOOLS/$(cat $SETUPTOOLS/setuptools.pth)
-      CLONEVENV_SITE="${virtualenv-clone}/lib/${python.libPrefix}/site-packages"
-      SITE_PACKAGES="[\'$PEW_SITE\',\'$SETUPTOOLS_SITE\',\'$CLONEVENV_SITE\']"
-      substituteInPlace $PEW_SITE/pew/pew.py \
-        --replace "from pew.pew" "import sys; sys.path.extend($SITE_PACKAGES); from pew.pew" \
-        --replace 'sys.executable, "-m", "virtualenv"' "'${virtualenv}/bin/virtualenv'"
+  # no tests are packaged
+  checkPhase = ''
+    $out/bin/pew > /dev/null
   '';
 
+  pythonImportsCheck = [ "pew" ];
+
   meta = with stdenv.lib; {
-      homepage = https://github.com/berdario/pew;
+    homepage = "https://github.com/berdario/pew";
     description = "Tools to manage multiple virtualenvs written in pure python";
     license = licenses.mit;
     platforms = platforms.all;
     maintainers = with maintainers; [ berdario ];
   };
-  }
+}