Extended IDLE's open module menu item to handle hierarchical module names.

Will look at doing something similar in import.c so that the effort won't
have to be repeated elsewhere.

Closes SF patch 600152.

Tools/idle/EditorWindow.py

@@ -81,6 +81,20 @@ An Integrated DeveLopment Environment for Python
 by Guido van Rossum
 """ % idlever.IDLE_VERSION
 
+def _find_module(fullname, path=None):
+    """Version of imp.find_module() that handles hierarchical module names"""
+
+    file = None
+    for tgt in fullname.split('.'):
+        if file is not None:
+            file.close()            # close intermediate files
+        (file, filename, descr) = imp.find_module(tgt, path)
+        if descr[2] == imp.PY_SOURCE:
+            break                   # find but not load the source file
+        module = imp.load_module(tgt, file, filename, descr)
+        path = module.__path__
+    return file, filename, descr
+
 class EditorWindow:
 
     from Percolator import Percolator
@@ -340,10 +354,9 @@ class EditorWindow:
                 name = string.strip(name)
             if not name:
                 return
-        # XXX Ought to support package syntax
         # XXX Ought to insert current file's directory in front of path
         try:
-            (f, file, (suffix, mode, type)) = imp.find_module(name)
+            (f, file, (suffix, mode, type)) = _find_module(name)
         except (NameError, ImportError), msg:
             tkMessageBox.showerror("Import error", str(msg), parent=self.text)
             return