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from IPython.core.interactiveshell import InteractiveShell
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from prompt_toolkit.completion import Completer, Completion
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from prompt_toolkit.history import InMemoryHistory
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from prompt_toolkit.shortcuts import create_prompt_application
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from prompt_toolkit.interface import CommandLineInterface
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from prompt_toolkit.key_binding.manager import KeyBindingManager
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from prompt_toolkit.keys import Keys
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from prompt_toolkit.layout.lexers import PygmentsLexer
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from pygments.lexers import Python3Lexer
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from pygments.token import Token
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class IPythonPTCompleter(Completer):
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"""Adaptor to provide IPython completions to prompt_toolkit"""
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def __init__(self, ipy_completer):
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self.ipy_completer = ipy_completer
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def get_completions(self, document, complete_event):
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used, matches = self.ipy_completer.complete(
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line_buffer=document.current_line,
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cursor_pos=document.cursor_position_col
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)
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start_pos = -len(used)
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for m in matches:
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yield Completion(m, start_position=start_pos)
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class PTInteractiveShell(InteractiveShell):
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pt_cli = None
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def get_prompt_tokens(self, cli):
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return [
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(Token.Prompt, 'In ['),
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(Token.Prompt, str(self.execution_count)),
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(Token.Prompt, ']: '),
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]
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def init_prompt_toolkit_cli(self):
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kbmanager = KeyBindingManager.for_prompt()
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@kbmanager.registry.add_binding(Keys.ControlJ) # Ctrl+J == Enter, seemingly
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def _(event):
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b = event.current_buffer
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if not b.document.on_last_line:
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b.newline()
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return
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status, indent = self.input_splitter.check_complete(b.document.text)
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if (status != 'incomplete') and b.accept_action.is_returnable:
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b.accept_action.validate_and_handle(event.cli, b)
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else:
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b.insert_text('\n' + (' ' * (indent or 0)))
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@kbmanager.registry.add_binding(Keys.ControlC)
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def _(event):
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event.current_buffer.reset()
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# Pre-populate history from IPython's history database
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history = InMemoryHistory()
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last_cell = u""
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for _, _, cell in self.history_manager.get_tail(self.history_load_length,
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include_latest=True):
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# Ignore blank lines and consecutive duplicates
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cell = cell.rstrip()
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if cell and (cell != last_cell):
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history.append(cell)
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app = create_prompt_application(multiline=True,
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lexer=PygmentsLexer(Python3Lexer),
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get_prompt_tokens=self.get_prompt_tokens,
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key_bindings_registry=kbmanager.registry,
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history=history,
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completer=IPythonPTCompleter(self.Completer),
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)
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self.pt_cli = CommandLineInterface(app)
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def __init__(self, *args, **kwargs):
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super(PTInteractiveShell, self).__init__(*args, **kwargs)
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self.init_prompt_toolkit_cli()
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self.keep_running = True
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def ask_exit(self):
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self.keep_running = False
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def interact(self):
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while self.keep_running:
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try:
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document = self.pt_cli.run()
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except EOFError:
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if self.ask_yes_no('Do you really want to exit ([y]/n)?','y','n'):
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self.ask_exit()
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else:
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if document:
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self.run_cell(document.text, store_history=True)
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if __name__ == '__main__':
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PTInteractiveShell.instance().interact()
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