From bff57c02afa5f8b09727a32371ad66d46b0a879f 2011-12-08 00:41:57
From: Bradley Froehle <brad.froehle@gmail.com>
Date: 2011-12-08 00:41:57
Subject: [PATCH] Simplify logic for deciding when to rewrite expressions for autocall.

---

diff --git a/IPython/core/prefilter.py b/IPython/core/prefilter.py
index af1a1eb..36ee65e 100644
--- a/IPython/core/prefilter.py
+++ b/IPython/core/prefilter.py
@@ -826,30 +826,33 @@ class AutoHandler(PrefilterHandler):
         elif esc == ESC_PAREN:
             newcmd = '%s(%s)' % (ifun,",".join(the_rest.split()))
         else:
-            # Auto-paren.
-            # We only apply it to argument-less calls if the autocall
-            # parameter is set to 2.  We only need to check that autocall is <
-            # 2, since this function isn't called unless it's at least 1.
-            if (not the_rest and (self.shell.autocall < 2) and not force_auto) \
-                or the_rest.startswith("("):
-                newcmd = '%s %s' % (ifun,the_rest)
-                auto_rewrite = False
+            # Auto-paren.       
+            if force_auto:
+                # Don't rewrite if it is already a call.
+                do_rewrite = not the_rest.startswith('(')
             else:
-                if not force_auto and the_rest.startswith('['):
-                    if hasattr(obj,'__getitem__'):
-                        # Don't autocall in this case: item access for an object
-                        # which is BOTH callable and implements __getitem__.
-                        newcmd = '%s %s' % (ifun,the_rest)
-                        auto_rewrite = False
-                    else:
-                        # if the object doesn't support [] access, go ahead and
-                        # autocall
-                        newcmd = '%s(%s)' % (ifun.rstrip(),the_rest)
-                elif the_rest.endswith(';'):
-                    newcmd = '%s(%s);' % (ifun.rstrip(),the_rest[:-1])
+                if not the_rest:
+                    # We only apply it to argument-less calls if the autocall
+                    # parameter is set to 2.
+                    do_rewrite = (self.shell.autocall >= 2)
+                elif the_rest.startswith('[') and hasattr(obj, '__getitem__'):
+                    # Don't autocall in this case: item access for an object
+                    # which is BOTH callable and implements __getitem__.
+                    do_rewrite = False
                 else:
-                    newcmd = '%s(%s)' % (ifun.rstrip(), the_rest)
+                    do_rewrite = True
 
+            # Figure out the rewritten command
+            if do_rewrite:
+                if the_rest.endswith(';'):
+                    newcmd = '%s(%s);' % (ifun.rstrip(),the_rest[:-1])
+                else:
+                    newcmd = '%s(%s)' % (ifun.rstrip(), the_rest)                
+            else:
+                normal_handler = self.prefilter_manager.get_handler_by_name('normal')
+                return normal_handler.handle(line_info)
+        
+        # Display the rewritten call
         if auto_rewrite:
             self.shell.auto_rewrite_input(newcmd)
 
diff --git a/IPython/core/tests/test_handlers.py b/IPython/core/tests/test_handlers.py
index bda0ad2..c6dd8eb 100644
--- a/IPython/core/tests/test_handlers.py
+++ b/IPython/core/tests/test_handlers.py
@@ -133,7 +133,7 @@ def test_handlers():
         ('len "abc"',       'len "abc"'),
         ('autocallable',    'autocallable()'),
         # Don't add extra brackets (gh-1117)
-        ('autocallable()',    'autocallable ()'),
+        ('autocallable()',    'autocallable()'),
         (",list 1 2 3",     'list("1", "2", "3")'),
         (";list 1 2 3",     'list("1 2 3")'),
         ("/len range(1,4)", 'len(range(1,4))'),
@@ -150,7 +150,7 @@ def test_handlers():
         ('len [1,2]', 'len([1,2])'),      # len doesn't support __getitem__...
         ('call_idx [1]', 'call_idx [1]'), # call_idx *does*..
         ('call_idx 1', 'call_idx(1)'),
-        ('len', 'len '), # only at 2 does it auto-call on single args
+        ('len', 'len'), # only at 2 does it auto-call on single args
         ])
     ip.magic('autocall 2')
     run([