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"""
interactive debugging with the Python Debugger.
"""
import py
import pdb, sys, linecache
def pytest_addoption(parser):
group = parser.getgroup("general")
group._addoption('--pdb',
action="store_true", dest="usepdb", default=False,
help="start the interactive Python debugger on errors.")
def pytest_configure(config):
if config.getvalue("usepdb"):
config.pluginmanager.register(PdbInvoke(), 'pdb')
class PdbInvoke:
def pytest_runtest_makereport(self, item, call):
if call.excinfo and not \
call.excinfo.errisinstance(py.test.skip.Exception):
# play well with capturing, slightly hackish
capman = item.config.pluginmanager.getplugin('capturemanager')
capman.suspendcapture()
tw = py.io.TerminalWriter()
repr = call.excinfo.getrepr()
repr.toterminal(tw)
post_mortem(call.excinfo._excinfo[2])
capman.resumecapture_item(item)
class Pdb(py.std.pdb.Pdb):
def do_list(self, arg):
self.lastcmd = 'list'
last = None
if arg:
try:
x = eval(arg, {}, {})
if type(x) == type(()):
first, last = x
first = int(first)
last = int(last)
if last < first:
# Assume it's a count
last = first + last
else:
first = max(1, int(x) - 5)
except:
print ('*** Error in argument: %s' % repr(arg))
return
elif self.lineno is None:
first = max(1, self.curframe.f_lineno - 5)
else:
first = self.lineno + 1
if last is None:
last = first + 10
filename = self.curframe.f_code.co_filename
breaklist = self.get_file_breaks(filename)
try:
for lineno in range(first, last+1):
# start difference from normal do_line
line = self._getline(filename, lineno)
# end difference from normal do_line
if not line:
print ('[EOF]')
break
else:
s = repr(lineno).rjust(3)
if len(s) < 4: s = s + ' '
if lineno in breaklist: s = s + 'B'
else: s = s + ' '
if lineno == self.curframe.f_lineno:
s = s + '->'
sys.stdout.write(s + '\t' + line)
self.lineno = lineno
except KeyboardInterrupt:
pass
do_l = do_list
def _getline(self, filename, lineno):
if hasattr(filename, "__source__"):
try:
return filename.__source__.lines[lineno - 1] + "\n"
except IndexError:
return None
return linecache.getline(filename, lineno)
def get_stack(self, f, t):
# Modified from bdb.py to be able to walk the stack beyond generators,
# which does not work in the normal pdb :-(
stack, i = pdb.Pdb.get_stack(self, f, t)
if f is None:
i = max(0, len(stack) - 1)
while i and stack[i][0].f_locals.get("__tracebackhide__", False):
i-=1
return stack, i
def post_mortem(t):
p = Pdb()
p.reset()
p.interaction(None, t)
def set_trace():
# again, a copy of the version in pdb.py
Pdb().set_trace(sys._getframe().f_back)
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