2011-07-21 Phil Muldoon <pmuldoon@redhat.com>

2011-07-21  Phil Muldoon  <pmuldoon@redhat.com>
            Tom Tromey  <tromey@redhat.com>

	* top.c (set_prompt): Rewrite to free previous prompt, free
	asynch_new_prompt and set both on new prompts.
	* event-top.c (display_gdb_prompt): Add prompt substitution
	logic.
	* python/python.c (before_prompt_hook): New function.

2011-07-21  Phil Muldoon  <pmuldoon@redhat.com>

	* gdb.python/python.exp: Add prompt substitution tests.

2011-07-21  Phil Muldoon  <pmuldoon@redhat.com>

	* observer.texi (GDB Observers): Add before_prompt observer.
	* gdb.texinfo (Basic Python): Add documentation for prompt
	substitution.