Store command history for the debugger

IPython/core/debugger.py

@@ -277,7 +277,9 b' class Pdb(OldPdb, object):'
                     line = self.cmdqueue.pop(0)
                 else:
                     try:
-                        line = ptk_prompt(get_prompt_tokens=get_prompt_tokens)
+                        line = ptk_prompt(get_prompt_tokens=get_prompt_tokens,
+                                          history=self.shell.debugger_history,
+                                         )
                     except EOFError:
                         line = 'EOF'
                 line = self.precmd(line)

IPython/terminal/ptshell.py

@@ -100,6 +100,7 b' class TerminalInteractiveShell(InteractiveShell):'
         self._update_layout()
 
     pt_cli = None
+    debugger_history = None
 
     autoedit_syntax = Bool(False,
         help="auto editing of files with syntax errors.",
@@ -362,6 +363,8 b' class TerminalInteractiveShell(InteractiveShell):'
         self.init_term_title()
         self.keep_running = True
 
+        self.debugger_history = InMemoryHistory()
+
     def ask_exit(self):
         self.keep_running = False