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import re | |
from IPython.core.magic import Magics, magics_class, line_magic | |
from IPython.core.debugger import Pdb | |
ipdb = Pdb() | |
@magics_class | |
class StepMagic(Magics): | |
@line_magic | |
def step(self, params): | |
# params might either be | |
# foo, bar, baz | |
# or | |
# foo(bar, baz) | |
# we need to determine if there is a comma before the opening paren. | |
comma_pos = params.find(',') | |
paren_pos = params.find(')') | |
if comma_pos > -1 and (comma_pos < paren_pos or paren_pos == -1): | |
param_list = params.split(',') | |
else: | |
# Match everything up to first open paren, and everything inside parens. | |
# We use lazy repetition on the first group to ensure that it copes when | |
# the expressions within the parens are themselves calls. | |
match = re.match(r'(.*?)\((.*)\)', params) | |
if match: | |
func, args = match.groups() | |
# TODO: this doesn't work when args consists of a tuple. | |
param_list = [func] + args.split(',') | |
else: | |
# Assume it's a single expression | |
param_list = [params] | |
evaluated_params = [self.shell.ev(p) for p in param_list] | |
ipdb.runcall(*evaluated_params) | |
_loaded = False | |
def load_ipython_extension(ip): | |
"""Load the extension in IPython.""" | |
global _loaded | |
if not _loaded: | |
plugin = StepMagic(shell=ip) | |
ip.register_magics(plugin) | |
_loaded = True |
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