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"""Tab-completion over zmq"""
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# Trying to get print statements to work during completion, not very
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# successfully...
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from __future__ import print_function
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import itertools
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try:
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import readline
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except ImportError:
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readline = None
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import rlcompleter
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import time
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import session
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class KernelCompleter(object):
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"""Kernel-side completion machinery."""
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def __init__(self, namespace):
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self.namespace = namespace
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self.completer = rlcompleter.Completer(namespace)
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def complete(self, line, text):
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# We'll likely use linel later even if now it's not used for anything
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matches = []
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complete = self.completer.complete
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for state in itertools.count():
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comp = complete(text, state)
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if comp is None:
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break
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matches.append(comp)
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return matches
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class ClientCompleter(object):
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"""Client-side completion machinery.
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How it works: self.complete will be called multiple times, with
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state=0,1,2,... When state=0 it should compute ALL the completion matches,
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and then return them for each value of state."""
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def __init__(self, client, session, socket):
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# ugly, but we get called asynchronously and need access to some
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# client state, like backgrounded code
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assert readline is not None, "ClientCompleter depends on readline"
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self.client = client
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self.session = session
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self.socket = socket
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self.matches = []
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def request_completion(self, text):
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# Get full line to give to the kernel in case it wants more info.
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line = readline.get_line_buffer()
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# send completion request to kernel
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msg = self.session.send(self.socket,
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'complete_request',
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dict(text=text, line=line))
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# Give the kernel up to 0.5s to respond
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for i in range(5):
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ident,rep = self.session.recv(self.socket)
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rep = Message(rep)
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if rep is not None and rep.msg_type == 'complete_reply':
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matches = rep.content.matches
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break
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time.sleep(0.1)
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else:
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# timeout
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print ('TIMEOUT') # Can't see this message...
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matches = None
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return matches
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def complete(self, text, state):
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if self.client.backgrounded > 0:
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print("\n[Not completing, background tasks active]")
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print(readline.get_line_buffer(), end='')
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return None
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if state==0:
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matches = self.request_completion(text)
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if matches is None:
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self.matches = []
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print('WARNING: Kernel timeout on tab completion.')
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else:
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self.matches = matches
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try:
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return self.matches[state]
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except IndexError:
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return None
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