113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
""" interactive debugging with PDB, the Python Debugger. """
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import pytest, py
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import sys
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def pytest_addoption(parser):
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group = parser.getgroup("general")
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group._addoption('--pdb',
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action="store_true", dest="usepdb", default=False,
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help="start the interactive Python debugger on errors.")
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def pytest_namespace():
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return {'set_trace': pytestPDB().set_trace}
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def pytest_configure(config):
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if config.getvalue("usepdb"):
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config.pluginmanager.register(PdbInvoke(), 'pdbinvoke')
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class pytestPDB:
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""" Pseudo PDB that defers to the real pdb. """
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item = None
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collector = None
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def set_trace(self):
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""" invoke PDB set_trace debugging, dropping any IO capturing. """
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frame = sys._getframe().f_back
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item = self.item or self.collector
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if item is not None:
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capman = item.config.pluginmanager.getplugin("capturemanager")
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out, err = capman.suspendcapture()
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if hasattr(item, 'outerr'):
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item.outerr = (item.outerr[0] + out, item.outerr[1] + err)
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tw = py.io.TerminalWriter()
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tw.line()
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tw.sep(">", "PDB set_trace (IO-capturing turned off)")
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py.std.pdb.Pdb().set_trace(frame)
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def pdbitem(item):
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pytestPDB.item = item
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pytest_runtest_setup = pytest_runtest_call = pytest_runtest_teardown = pdbitem
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@pytest.mark.tryfirst
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def pytest_make_collect_report(__multicall__, collector):
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try:
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pytestPDB.collector = collector
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return __multicall__.execute()
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finally:
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pytestPDB.collector = None
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def pytest_runtest_makereport():
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pytestPDB.item = None
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class PdbInvoke:
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@pytest.mark.tryfirst
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def pytest_runtest_makereport(self, item, call, __multicall__):
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rep = __multicall__.execute()
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if not call.excinfo or \
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call.excinfo.errisinstance(pytest.skip.Exception) or \
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call.excinfo.errisinstance(py.std.bdb.BdbQuit):
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return rep
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if hasattr(rep, "wasxfail"):
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return rep
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return _enter_pdb(item, call.excinfo, rep)
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def _enter_pdb(item, excinfo, rep):
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# we assume that the above execute() suspended capturing
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# XXX we re-use the TerminalReporter's terminalwriter
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# because this seems to avoid some encoding related troubles
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# for not completely clear reasons.
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tw = item.config.pluginmanager.getplugin("terminalreporter")._tw
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tw.line()
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tw.sep(">", "traceback")
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rep.toterminal(tw)
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tw.sep(">", "entering PDB")
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tb = _postmortem_traceback(excinfo)
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post_mortem(tb)
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rep._pdbshown = True
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return rep
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def _postmortem_traceback(excinfo):
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# A doctest.UnexpectedException is not useful for post_mortem.
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# Use the underlying exception instead:
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if isinstance(excinfo.value, py.std.doctest.UnexpectedException):
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return excinfo.value.exc_info[2]
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else:
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return excinfo._excinfo[2]
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def _find_last_non_hidden_frame(stack):
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i = max(0, len(stack) - 1)
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while i and stack[i][0].f_locals.get("__tracebackhide__", False):
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i -= 1
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return i
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def post_mortem(t):
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pdb = py.std.pdb
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class Pdb(pdb.Pdb):
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def get_stack(self, f, t):
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stack, i = pdb.Pdb.get_stack(self, f, t)
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if f is None:
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i = _find_last_non_hidden_frame(stack)
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return stack, i
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p = Pdb()
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p.reset()
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p.interaction(None, t)
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