Fix: unable to list global packages if extra is used (#51)

vpip/commands/list.py

@@ -24,11 +24,13 @@ def iter_global_packages():
     
     :rtype: Iterator[PackageInfo]
     """
+    from packaging.requirements import Requirement
     from .. import venv, pip_api
-    for name in venv.iter_global_packages():
-        vv = venv.get_global_pkg_venv(name)
+    for dir_name in venv.iter_global_packages():
+        vv = venv.get_global_pkg_venv(dir_name)
         with vv.activate():
-            yield PackageInfo(name, pip_api.show([name])[0].version)
+            req = Requirement(dir_name)
+            yield PackageInfo(req.name, pip_api.show([req.name])[0].version)
 
 def print_global_packages(check_outdated=False):
     for info in iter_global_packages():
@@ -116,4 +118,4 @@ def __str__(self):
         else:
             lines.append("{} (not installed)".format(self.name))
         return "\n".join(lines)
-
+