fixing bin to activate virtualenv

setup.py

@@ -19,7 +19,7 @@
 ]
 
 setup(name='uranium',
-      version='0.0.52',
+      version='0.0.55',
       description='a build system for python',
       long_description='a build system for python',
       author='Yusuke Tsutsumi',

uranium/bin.py

@@ -1,13 +1,17 @@
 BIN_SCRIPT_TEMPLATE = """
-import os
+#!/usr/bin/env {python_version}
+import os; activate_this=os.path.join(os.path.dirname(os.path.realpath(__file__)), 'activate_this.py'); exec(compile(open(activate_this).read(), activate_this, 'exec'), dict(__file__=activate_this)); del os, activate_this
 
+import os
 bin_directory = os.path.dirname(os.path.realpath(__file__))
 base = os.path.join(bin_directory, os.pardir)
 {extras}
 {body}
 """.strip()
 import os
 import stat
+import sys
+
 
 class BinDirectory(object):
     """ this wraps a few convenience methods for the bin directory """
@@ -25,7 +29,8 @@ def install_script(self, name, body, execution_dir="base"):
 
         bin_script = BIN_SCRIPT_TEMPLATE.format(
             body=body,
-            extras=extras
+            extras=extras,
+            python_version=self._get_python_version()
         )
 
         target_path = os.path.join(self.root, name)
@@ -35,6 +40,12 @@ def install_script(self, name, body, execution_dir="base"):
 
         _make_executable(target_path)
 
+    def _get_python_version(self):
+        return "python{major}.{minor}".format(
+            major=sys.version_info[0],
+            minor=sys.version_info[1]
+        )
+
 
 def _make_executable(path):
     permission = os.stat(path).st_mode | stat.S_IXUSR | stat.S_IRUSR