use package cache in import completer, for performance

IPython/Extensions/ipy_stock_completers.py

@@ -45,14 +45,19 b' def apt_completers(self, event):'
 ip.set_hook('complete_command', apt_completers, re_key = '.*apt-get')
 ip.set_hook('complete_command', apt_completers, re_key = '.*yum')
 
+pkg_cache = None
+
 def module_completer(self,event):    
     """ Give completions after user has typed 'import' """
     
+    global pkg_cache
     import pkgutil,imp,time
-    for ld, name, ispkg in pkgutil.walk_packages():
-        if ispkg:
-            yield name + '.'
-        else:
+    #current = 
+    if pkg_cache is None:
+        print "\n\n[Standby while scanning modules, this can take a while]\n\n"
+        pkg_cache = list(pkgutil.walk_packages())
+    
+    for ld, name, ispkg in pkg_cache:
             yield name
     return
 
@@ -89,7 +94,7 b' def runlistpy(self, event):'
 
 ip.set_hook('complete_command', runlistpy, str_key = '%run')
 
-def listdirs(self, event):
+def cd_completer(self, event):
     relpath = event.symbol
     
     if '-b' in event.line:
@@ -112,4 +117,4 b' def listdirs(self, event):'
         return [relpath]
     return found
 
-ip.set_hook('complete_command', listdirs, str_key = '%cd')
  No newline at end of file
+ip.set_hook('complete_command', cd_completer, str_key = '%cd')
  No newline at end of file