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import asyncio
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import os
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import sys
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from IPython.core.debugger import Pdb
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from IPython.core.completer import IPCompleter
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from .ptutils import IPythonPTCompleter
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from .shortcuts import create_ipython_shortcuts
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from . import embed
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from pathlib import Path
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from pygments.token import Token
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from prompt_toolkit.application import create_app_session
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from prompt_toolkit.shortcuts.prompt import PromptSession
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from prompt_toolkit.enums import EditingMode
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from prompt_toolkit.formatted_text import PygmentsTokens
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from prompt_toolkit.history import InMemoryHistory, FileHistory
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from concurrent.futures import ThreadPoolExecutor
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from prompt_toolkit import __version__ as ptk_version
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PTK3 = ptk_version.startswith('3.')
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# we want to avoid ptk as much as possible when using subprocesses
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# as it uses cursor positioning requests, deletes color ....
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_use_simple_prompt = "IPY_TEST_SIMPLE_PROMPT" in os.environ
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class TerminalPdb(Pdb):
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"""Standalone IPython debugger."""
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def __init__(self, *args, pt_session_options=None, **kwargs):
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Pdb.__init__(self, *args, **kwargs)
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self._ptcomp = None
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self.pt_init(pt_session_options)
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self.thread_executor = ThreadPoolExecutor(1)
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def pt_init(self, pt_session_options=None):
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"""Initialize the prompt session and the prompt loop
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and store them in self.pt_app and self.pt_loop.
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Additional keyword arguments for the PromptSession class
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can be specified in pt_session_options.
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"""
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if pt_session_options is None:
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pt_session_options = {}
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def get_prompt_tokens():
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return [(Token.Prompt, self.prompt)]
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if self._ptcomp is None:
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compl = IPCompleter(
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shell=self.shell, namespace={}, global_namespace={}, parent=self.shell
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)
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# add a completer for all the do_ methods
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methods_names = [m[3:] for m in dir(self) if m.startswith("do_")]
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def gen_comp(self, text):
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return [m for m in methods_names if m.startswith(text)]
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import types
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newcomp = types.MethodType(gen_comp, compl)
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compl.custom_matchers.insert(0, newcomp)
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# end add completer.
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self._ptcomp = IPythonPTCompleter(compl)
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# setup history only when we start pdb
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if self.shell.debugger_history is None:
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if self.shell.debugger_history_file is not None:
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p = Path(self.shell.debugger_history_file).expanduser()
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if not p.exists():
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p.touch()
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self.debugger_history = FileHistory(os.path.expanduser(str(p)))
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else:
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self.debugger_history = InMemoryHistory()
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else:
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self.debugger_history = self.shell.debugger_history
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options = dict(
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message=(lambda: PygmentsTokens(get_prompt_tokens())),
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editing_mode=getattr(EditingMode, self.shell.editing_mode.upper()),
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key_bindings=create_ipython_shortcuts(self.shell),
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history=self.debugger_history,
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completer=self._ptcomp,
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enable_history_search=True,
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mouse_support=self.shell.mouse_support,
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complete_style=self.shell.pt_complete_style,
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style=getattr(self.shell, "style", None),
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color_depth=self.shell.color_depth,
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)
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if not PTK3:
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options['inputhook'] = self.shell.inputhook
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options.update(pt_session_options)
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if not _use_simple_prompt:
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self.pt_loop = asyncio.new_event_loop()
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self.pt_app = PromptSession(**options)
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def _prompt(self):
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"""
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In case other prompt_toolkit apps have to run in parallel to this one (e.g. in madbg),
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create_app_session must be used to prevent mixing up between them. According to the prompt_toolkit docs:
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> If you need multiple applications running at the same time, you have to create a separate
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> `AppSession` using a `with create_app_session():` block.
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"""
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with create_app_session():
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return self.pt_app.prompt()
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def cmdloop(self, intro=None):
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"""Repeatedly issue a prompt, accept input, parse an initial prefix
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off the received input, and dispatch to action methods, passing them
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the remainder of the line as argument.
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override the same methods from cmd.Cmd to provide prompt toolkit replacement.
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"""
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if not self.use_rawinput:
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raise ValueError('Sorry ipdb does not support use_rawinput=False')
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# In order to make sure that prompt, which uses asyncio doesn't
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# interfere with applications in which it's used, we always run the
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# prompt itself in a different thread (we can't start an event loop
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# within an event loop). This new thread won't have any event loop
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# running, and here we run our prompt-loop.
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self.preloop()
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try:
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if intro is not None:
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self.intro = intro
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if self.intro:
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print(self.intro, file=self.stdout)
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stop = None
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while not stop:
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if self.cmdqueue:
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line = self.cmdqueue.pop(0)
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else:
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self._ptcomp.ipy_completer.namespace = self.curframe_locals
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self._ptcomp.ipy_completer.global_namespace = self.curframe.f_globals
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# Run the prompt in a different thread.
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if not _use_simple_prompt:
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try:
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line = self.thread_executor.submit(self._prompt).result()
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except EOFError:
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line = "EOF"
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else:
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line = input("ipdb> ")
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line = self.precmd(line)
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stop = self.onecmd(line)
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stop = self.postcmd(stop, line)
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self.postloop()
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except Exception:
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raise
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def do_interact(self, arg):
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ipshell = embed.InteractiveShellEmbed(
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config=self.shell.config,
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banner1="*interactive*",
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exit_msg="*exiting interactive console...*",
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)
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global_ns = self.curframe.f_globals
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ipshell(
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module=sys.modules.get(global_ns["__name__"], None),
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local_ns=self.curframe_locals,
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)
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def set_trace(frame=None):
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"""
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Start debugging from `frame`.
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If frame is not specified, debugging starts from caller's frame.
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"""
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TerminalPdb().set_trace(frame or sys._getframe().f_back)
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if __name__ == '__main__':
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import pdb
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# IPython.core.debugger.Pdb.trace_dispatch shall not catch
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# bdb.BdbQuit. When started through __main__ and an exception
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# happened after hitting "c", this is needed in order to
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# be able to quit the debugging session (see #9950).
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old_trace_dispatch = pdb.Pdb.trace_dispatch
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pdb.Pdb = TerminalPdb # type: ignore
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pdb.Pdb.trace_dispatch = old_trace_dispatch # type: ignore
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pdb.main()
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