Make code execution more robust.

IPython/frontend/linefrontendbase.py

@@ -101,21 +101,28 b' class LineFrontEndBase(FrontEndBase):'
         if raw_string is None:
             raw_string = string
         # Create a false result, in case there is an exception
-        result = dict(number=self.prompt_number)
+        self.last_result = dict(number=self.prompt_number)
         try:
             self.history.input_cache[-1] = raw_string
             result = self.shell.execute(python_string)
+            self.last_result = result
             self.render_result(result)
-        except Exception, e:
+        except:
             self.show_traceback()
         finally:
-            self.prompt_number += 1
-            self.new_prompt(self.prompt % (result['number'] + 1))
-            # Start a new empty history entry
-            self._add_history(None, '')
-            # The result contains useful information that can be used
-            # elsewhere.
-            self.last_result = result
+            self.after_execute()
+
+
+    def after_execute(self):
+        """ All the operations required after an execution to put the
+            terminal back in a shape where it is usable.
+        """
+        self.prompt_number += 1
+        self.new_prompt(self.prompt % (self.last_result['number'] + 1))
+        # Start a new empty history entry
+        self._add_history(None, '')
+        # The result contains useful information that can be used
+        # elsewhere.
 
 
     def _on_enter(self):
@@ -124,13 +131,15 b' class LineFrontEndBase(FrontEndBase):'
         """
         current_buffer = self.get_current_edit_buffer()
         cleaned_buffer = self.prefilter_input(current_buffer)
-        if self.is_complete(cleaned_buffer):
+        if self.is_complete(cleaned_buffer + '\n'):
+            # The '\n' is important in case prefiltering empties the
+            # line, to get a new prompt.
             self.execute(cleaned_buffer, raw_string=current_buffer)
         else:
             if len(current_buffer.split('\n'))>1:
-                self.write('\n' + self._get_indent_string(current_buffer))
+                self.write(self._get_indent_string(current_buffer))
             else:
-                self.write('\n\t')
+                self.write('\t')
 
 
     #--------------------------------------------------------------------------
@@ -138,7 +147,7 b' class LineFrontEndBase(FrontEndBase):'
     #--------------------------------------------------------------------------
  
     def _get_indent_string(self, string):
-        print >>sys.__stderr__, string.split('\n')
+        string = string.replace('\t', ' '*4)
         string = string.split('\n')[-1]
         indent_chars = len(string) - len(string.lstrip())
         indent_string = '\t'*(indent_chars // 4) + \

IPython/frontend/wx/console_widget.py

@@ -343,6 +343,7 b' class ConsoleWidget(editwindow.EditWindow):'
             if event.KeyCode in (13, wx.WXK_NUMPAD_ENTER) and \
                         event.Modifiers in (wx.MOD_NONE, wx.MOD_WIN):
                 catched = True
+                self.write('\n')
                 self._on_enter()
 
             elif event.KeyCode == wx.WXK_HOME:

IPython/frontend/wx/wx_frontend.py

@@ -32,7 +32,7 b' from IPython.frontend.prefilterfrontend import PrefilterFrontEnd'
 class IPythonWxController(PrefilterFrontEnd, ConsoleWidget):
 
     output_prompt = \
-    '\n\x01\x1b[0;31m\x02Out[\x01\x1b[1;31m\x02%i\x01\x1b[0;31m\x02]: \x01\x1b[0m\x02'
+    '\x01\x1b[0;31m\x02Out[\x01\x1b[1;31m\x02%i\x01\x1b[0;31m\x02]: \x01\x1b[0m\x02'
   
     #--------------------------------------------------------------------------
     # Public API