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PR python/13598 - add before_prompt event

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This adds an event that is emitted just before GDB presents a prompt
to the user.  This provides Python code a way to react to whatever
changes might have been made by the previous command.  For example, in
my GUI I use this to track changes to the selected frame and reflect
them in the UI.

Built and regtested on x86-64 Fedora 23.

gdb/ChangeLog
2017-02-14  Tom Tromey  <tom@tromey.com>

	PR python/13598:
	* python/python.c (gdbpy_before_prompt_hook): Emit before_prompt
	event.
	* python/py-evts.c (gdbpy_initialize_py_events): Add
	before_prompt registry.
	* python/py-events.h (events_object) <before_prompt>: New field.

gdb/doc/ChangeLog
2017-02-14  Tom Tromey  <tom@tromey.com>

	PR python/13598:
	* python.texi (Events In Python): Document events.before_prompt.

gdb/testsuite/ChangeLog
2017-02-14  Tom Tromey  <tom@tromey.com>

	PR python/13598:
	* gdb.python/py-events.exp: Add before_prompt event tests.
This commit is contained in:
Tom Tromey
2015-04-29 09:44:24 -06:00
parent 075beec08a
commit 3f77c7691f
8 changed files with 57 additions and 0 deletions
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25
gdb/testsuite/gdb.python/py-events.exp
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@@ -210,3 +210,28 @@ gdb_test "continue" ".*event type: continue.*
.*exit code: 12.*
.*exit inf: 2.*
dir ok: True.*" "Inferior 2 terminated."
# Test before_prompt event.
gdb_py_test_multiple "define new user command" \
"define xxz" "End with a line saying just .end.." \
"set variable \$x = 72" "" \
"set variable \$y = 93" "" \
"end" ""
gdb_py_test_multiple "add before_prompt listener" \
"python" "" \
"count = 0" "" \
"def listener():" "" \
" global count" "" \
" count = count + 1" "" \
"gdb.events.before_prompt.connect(listener)" "" \
"end" ""
gdb_test_no_output "set variable \$x = 32" "do something"
# Result is due to one emitted before "set var" and one emitted before
# this command.
gdb_test "python print(count)" 2 "check for before_prompt event"
gdb_test_no_output "xxz" "run a canned sequence"
gdb_test "python print(count)" 4 "check for before_prompt event"