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""" interactive debugging with PDB, the Python Debugger. """
from __future__ import absolute_import
import pdb
import sys
import pytest
def pytest_addoption(parser):
group = parser.getgroup("general")
group._addoption(
'--pdb', dest="usepdb", action="store_true",
help="start the interactive Python debugger on errors.")
group._addoption(
'--pdbcls', dest="usepdb_cls", metavar="modulename:classname",
help="start a custom interactive Python debugger on errors. "
"For example: --pdbcls=IPython.terminal.debugger:TerminalPdb")
def pytest_namespace():
return {'set_trace': pytestPDB().set_trace}
def pytest_configure(config):
if config.getvalue("usepdb") or config.getvalue("usepdb_cls"):
config.pluginmanager.register(PdbInvoke(), 'pdbinvoke')
if config.getvalue("usepdb_cls"):
modname, classname = config.getvalue("usepdb_cls").split(":")
__import__(modname)
pdb_cls = getattr(sys.modules[modname], classname)
else:
pdb_cls = pdb.Pdb
pytestPDB._pdb_cls = pdb_cls
old = (pdb.set_trace, pytestPDB._pluginmanager)
def fin():
pdb.set_trace, pytestPDB._pluginmanager = old
pytestPDB._config = None
pytestPDB._pdb_cls = pdb.Pdb
pdb.set_trace = pytest.set_trace
pytestPDB._pluginmanager = config.pluginmanager
pytestPDB._config = config
config._cleanup.append(fin)
class pytestPDB:
""" Pseudo PDB that defers to the real pdb. """
_pluginmanager = None
_config = None
_pdb_cls = pdb.Pdb
def set_trace(self):
""" invoke PDB set_trace debugging, dropping any IO capturing. """
import _pytest.config
frame = sys._getframe().f_back
if self._pluginmanager is not None:
capman = self._pluginmanager.getplugin("capturemanager")
if capman:
capman.suspendcapture(in_=True)
tw = _pytest.config.create_terminal_writer(self._config)
tw.line()
tw.sep(">", "PDB set_trace (IO-capturing turned off)")
self._pluginmanager.hook.pytest_enter_pdb(config=self._config)
self._pdb_cls().set_trace(frame)
class PdbInvoke:
def pytest_exception_interact(self, node, call, report):
capman = node.config.pluginmanager.getplugin("capturemanager")
if capman:
out, err = capman.suspendcapture(in_=True)
sys.stdout.write(out)
sys.stdout.write(err)
_enter_pdb(node, call.excinfo, report)
def pytest_internalerror(self, excrepr, excinfo):
for line in str(excrepr).split("\n"):
sys.stderr.write("INTERNALERROR> %s\n" %line)
sys.stderr.flush()
tb = _postmortem_traceback(excinfo)
post_mortem(tb)
def _enter_pdb(node, excinfo, rep):
# XXX we re-use the TerminalReporter's terminalwriter
# because this seems to avoid some encoding related troubles
# for not completely clear reasons.
tw = node.config.pluginmanager.getplugin("terminalreporter")._tw
tw.line()
tw.sep(">", "traceback")
rep.toterminal(tw)
tw.sep(">", "entering PDB")
tb = _postmortem_traceback(excinfo)
post_mortem(tb)
rep._pdbshown = True
return rep
def _postmortem_traceback(excinfo):
# A doctest.UnexpectedException is not useful for post_mortem.
# Use the underlying exception instead:
from doctest import UnexpectedException
if isinstance(excinfo.value, UnexpectedException):
return excinfo.value.exc_info[2]
else:
return excinfo._excinfo[2]
def _find_last_non_hidden_frame(stack):
i = max(0, len(stack) - 1)
while i and stack[i][0].f_locals.get("__tracebackhide__", False):
i -= 1
return i
def post_mortem(t):
class Pdb(pytestPDB._pdb_cls):
def get_stack(self, f, t):
stack, i = pdb.Pdb.get_stack(self, f, t)
if f is None:
i = _find_last_non_hidden_frame(stack)
return stack, i
p = Pdb()
p.reset()
p.interaction(None, t)
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