[#1035] Use virtualenv when available

gdbinit.py

@@ -1,8 +1,27 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
+import glob
 import locale
 import sys
-from os import path
+from os import path, environ
+
+virtual_env = environ.get('VIRTUAL_ENV')
+
+
+if virtual_env:
+    print("Found that you're using VIRTUAL_ENV '%s'" % virtual_env)
+    possible_site_packages = glob.glob(path.join(virtual_env, 'lib', 'python*', 'site-packages'))
+    if len(possible_site_packages) > 1:
+        print("Found multiple site packages in virtualenv, using the last choice.")
+    virtualenv_site_packages = []
+    for site_packages in possible_site_packages:
+        virtualenv_site_packages = site_packages
+    if not virtualenv_site_packages:
+        print("Not found site-packages in virtualenv, guessing")
+        guessed_python_directory = 'python%s.%s' % (sys.version_info.major, sys.version_info.minor)
+        virtualenv_site_packages = path.join(virtual_env, 'lib', guessed_python_directory, 'site-packages')
+    print("Using virtualenv's python site packages: %s " % virtualenv_site_packages)
+    sys.path.append(virtualenv_site_packages)
 
 directory, file = path.split(__file__)
 directory       = path.expanduser(directory)